advanced-springcloud / cloud-book

《Spring Cloud 微服务架构进阶》各章节附录源码

Spring Cloud 微服务架构进阶

《Spring Cloud 微服务架构进阶》，重点介绍微服务架构的Spring Cloud框架，在实践的基础上进行用法的拓展与相关组件的源码分析，包括：服务发现、负载均衡、断路、声明式HTTP调用客户端、网关、分布式配置中心、安全权限、消息总线等组件。本书适合Java开发人员，特别适合正在进行微服务化改造的开发人员、架构师，在改造过程中进行参考与进阶应用。

本项目为《Spring Cloud 微服务架构进阶》各章节附录源码。我们为项目中每个章节涉及到的组件（redis、rabbitmq、consul等）提供了docker-compose一键启动，进入项目根目录运行即可。

谢谢支持正版图书，购买链接：https://item.jd.com/12453340.html

如遇刊印和错误，请加入读者群核实和校正，感谢您的支持。

12/11 更新

修复第八章，Hystrix过滤器使用过程产生的com.netflix.hystrix.exception.HystrixRuntimeException: fallbackcmd failed and fallback failed.

增加 - RemoveRequestHeader=Origin过滤器。

加入读者交流群

cloud-book's Issues

自定义Gatewayfilter获取body第一次请求无法执行

###问题描述
我自定义了一个GatewayFilter用于校验post请求数据的合法性，做了一下操作：

• 获取头部
• 获取body
• 校验头部和body

但是测试的时候发现，获取body的代码，在第一次请求时不执行，之后测试都是可以执行的。

###源码

package com.learn.filter;

import com.google.gson.Gson;
import com.learn.utils.ErrorType;
import com.learn.utils.MD5Util;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.factory.AbstractGatewayFilterFactory;
import org.springframework.cloud.gateway.filter.factory.rewrite.RewriteFunction;
import org.springframework.cloud.gateway.support.BodyInserterContext;
import org.springframework.cloud.gateway.support.CachedBodyOutputMessage;
import org.springframework.cloud.gateway.support.DefaultServerRequest;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpRequestDecorator;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.BodyInserter;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.server.ServerRequest;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;

@Component
public class CtokenGatewayFilter extends AbstractGatewayFilterFactory<CtokenGatewayFilter.Config> {


    public CtokenGatewayFilter() {
        super(Config.class);
    }


    @Override
    public GatewayFilter apply(Config config) {
        return (exchange, chain) -> {

            ServerRequest serverRequest = new DefaultServerRequest(exchange);

            System.out.println("访问路径============" + serverRequest.uri().getPath());
            HttpHeaders headers = exchange.getRequest().getHeaders();

            List<String> errorList = headers.get("bodystr");


            if (null == errorList || errorList.size() == 0) {

                Flux<HashMap> bodyToFlux = serverRequest.bodyToFlux(config.inClass);

                Gson gson = new Gson();

                AtomicReference<String> bodyRef = new AtomicReference<>();
                DefaultDataBufferFactory defaultDataBuffer = new DefaultDataBufferFactory();


                bodyToFlux.map(o -> {
                    System.out.println("class=======" + o.getClass());
                    System.out.println("o 的value=====" + gson.toJson(o));
                    return o;
                }).subscribe();

                String bodyStr = bodyRef.get();
                Message message = checkCtoken(headers, bodyStr);
                System.out.println("请求数据===========" + bodyStr);
                if (null != message) {
                    // 写出校验错误结果
                    return exchange.getResponse().writeWith(messageBufferFlux);
                } else {
                    // 重建请求 防止报错
                    return chain.filter(exchange.mutate().request(decorator).build());
                }

            } else {

                return chain.filter(exchange);
            }
        };
    }

    /**
     * 检查ctoken
     * @param headers 请求头
     * @return 校验结果
     */
    @SuppressWarnings("unchecked")
    private Message checkCtoken(HttpHeaders headers, String httpEntity) {

        Message message;

        List<String> tokenList = headers.get("token");
        List<String> partneridList = headers.get("partnerid");
        List<String> memberidList = headers.get("memberid");
        List<String> timestampList = headers.get("timestamp");
        List<String> ctokenList = headers.get("ctoken");

        message = validParams(tokenList, partneridList, memberidList, ctokenList);
        if (null != message) {
            return message;
        }


        String token = tokenList.get(0);
        String partnerid = partneridList.get(0);
        String memberid = memberidList.get(0);
        String timestamp = timestampList.get(0);
        String ctoken = ctokenList.get(0);

        String validCToken = getCtoken(partnerid, memberid, timestamp, token, httpEntity);
        if (!validCToken.equalsIgnoreCase(ctoken)) {
            message = new Message();
            message.setResult(ErrorType.CH_PAEAM_ERROR);
            message.setMsg("非法的参数");
        }

        return message;
    }




    @Override
    public String name() {
        return "ctoken";
    }

    @Override
    public List<String> shortcutFieldOrder() {
        return Collections.singletonList("ctoken");
    }


    public static class Config {

        private boolean enabled;
        private Class inClass = HashMap.class;
        private Class outClass = HashMap.class;

        private RewriteFunction rewriteFunction = (exchange, bodyMap) -> {


            HashMap<String, Object> valueMap = (HashMap<String, Object>) bodyMap;
            String vin = (String) valueMap.get("vin");       
           
            System.out.println("uname===========" + valueMap.get("uname"));
            valueMap.put("name", "zhangsan");
            valueMap.put("age", 18);

            Map<String, Object> resultMap = new HashMap<>();
            resultMap.put("msg", "校验错误");
            resultMap.put("result", 99);


            return Mono.just(resultMap);
        };

        public RewriteFunction getRewriteFunction() {
            return rewriteFunction;
        }

        public void setRewriteFunction(RewriteFunction rewriteFunction) {
            this.rewriteFunction = rewriteFunction;
        }

        public Class getInClass() {
            return inClass;
        }

        public void setInClass(Class inClass) {
            this.inClass = inClass;
        }

        public Class getOutClass() {
            return outClass;
        }

        public void setOutClass(Class outClass) {
            this.outClass = outClass;
        }

        public boolean isEnabled() {
            return enabled;
        }

        public void setEnabled(boolean enabled) {
            this.enabled = enabled;
        }
    }

}

错误日志

访问路径============/user/getUserById  // 这是第一次请求
请求数据===========null
判断结果{"msg":"非法参数","result":99}

//下面的错误时其它代码导致的
2019-01-10 22:01:42.237  WARN 35400 --- [ctor-http-nio-3] io.netty.util.concurrent.DefaultPromise  : An exception was thrown by reactor.ipc.netty.http.server.HttpServerHandler$TerminateHttpHandler.operationComplete()

reactor.core.Exceptions$ErrorCallbackNotImplemented: org.springframework.core.codec.DecodingException: JSON decoding error: Unexpected end-of-input: was expecting rest of token (internal state: 4); nested exception is com.fasterxml.jackson.core.io.JsonEOFException: Unexpected end-of-input: was expecting rest of token (internal state: 4)
 at [Source: UNKNOWN; line: 28, column: 5]
Caused by: org.springframework.core.codec.DecodingException: JSON decoding error: Unexpected end-of-input: was expecting rest of token (internal state: 4); nested exception is com.fasterxml.jackson.core.io.JsonEOFException: Unexpected end-of-input: was expecting rest of token (internal state: 4)
 at [Source: UNKNOWN; line: 28, column: 5]
	at org.springframework.http.codec.json.Jackson2Tokenizer.endOfInput(Jackson2Tokenizer.java:117) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]
	at reactor.core.publisher.FluxMapSignal$FluxMapSignalSubscriber.onComplete(FluxMapSignal.java:199) ~[reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:130) ~[reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:245) ~[reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:130) ~[reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.ipc.netty.channel.FluxReceive.terminateReceiver(FluxReceive.java:380) ~[reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.FluxReceive.drainReceiver(FluxReceive.java:204) ~[reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:345) ~[reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:338) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperations.onHandlerTerminate(ChannelOperations.java:404) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.http.server.HttpServerOperations.cleanHandlerTerminate(HttpServerOperations.java:473) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.http.server.HttpServerHandler$TerminateHttpHandler.operationComplete(HttpServerHandler.java:330) ~[reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.http.server.HttpServerHandler$TerminateHttpHandler.operationComplete(HttpServerHandler.java:320) ~[reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:511) [netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:485) [netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:424) [netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:103) [netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.internal.PromiseNotificationUtil.trySuccess(PromiseNotificationUtil.java:48) [netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.ChannelOutboundBuffer.safeSuccess(ChannelOutboundBuffer.java:696) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.ChannelOutboundBuffer.remove(ChannelOutboundBuffer.java:258) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.ChannelOutboundBuffer.removeBytes(ChannelOutboundBuffer.java:338) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.socket.nio.NioSocketChannel.doWrite(NioSocketChannel.java:411) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.flush0(AbstractChannel.java:934) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:360) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:901) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.flush(DefaultChannelPipeline.java:1396) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.flush(CombinedChannelDuplexHandler.java:533) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.flush(ChannelOutboundHandlerAdapter.java:115) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.flush(CombinedChannelDuplexHandler.java:358) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.ChannelDuplexHandler.flush(ChannelDuplexHandler.java:117) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush(AbstractChannelHandlerContext.java:768) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.flush(AbstractChannelHandlerContext.java:749) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at reactor.ipc.netty.channel.ChannelOperationsHandler.doWrite(ChannelOperationsHandler.java:300) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperationsHandler.drain(ChannelOperationsHandler.java:476) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperationsHandler.flush(ChannelOperationsHandler.java:194) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:776) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:802) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:814) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:794) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:831) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:1071) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:300) [netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at reactor.ipc.netty.http.server.HttpServerOperations.onOutboundComplete(HttpServerOperations.java:451) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperations.onComplete(ChannelOperations.java:221) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onComplete(MonoPeekTerminal.java:321) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.FluxPeekFuseable$PeekFuseableConditionalSubscriber.onComplete(FluxPeekFuseable.java:555) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.Operators$MonoSubscriber.onComplete(Operators.java:1121) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoIgnoreThen$ThenAcceptInner.onComplete(MonoIgnoreThen.java:313) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.Operators.complete(Operators.java:128) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:45) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:53) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:70) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) [reactor-core-3.1.10.RELEASE.jar:3.1.10.RELEASE]
	at reactor.ipc.netty.channel.ChannelOperations.applyHandler(ChannelOperations.java:381) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at reactor.ipc.netty.http.server.HttpServerOperations.onHandlerStart(HttpServerOperations.java:399) [reactor-netty-0.7.10.RELEASE.jar:0.7.10.RELEASE]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:446) ~[netty-transport-4.1.29.Final.jar:4.1.29.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884) ~[netty-common-4.1.29.Final.jar:4.1.29.Final]
	at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_181]
Caused by: com.fasterxml.jackson.core.io.JsonEOFException: Unexpected end-of-input: was expecting rest of token (internal state: 4)
 at [Source: UNKNOWN; line: 28, column: 5]
	at com.fasterxml.jackson.core.base.ParserMinimalBase._reportInvalidEOF(ParserMinimalBase.java:594) ~[jackson-core-2.9.7.jar:2.9.7]
	at com.fasterxml.jackson.core.json.async.NonBlockingJsonParser._finishTokenWithEOF(NonBlockingJsonParser.java:399) ~[jackson-core-2.9.7.jar:2.9.7]
	at com.fasterxml.jackson.core.json.async.NonBlockingJsonParser.nextToken(NonBlockingJsonParser.java:162) ~[jackson-core-2.9.7.jar:2.9.7]
	at org.springframework.http.codec.json.Jackson2Tokenizer.parseTokenBufferFlux(Jackson2Tokenizer.java:128) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]
	at org.springframework.http.codec.json.Jackson2Tokenizer.endOfInput(Jackson2Tokenizer.java:113) ~[spring-web-5.0.10.RELEASE.jar:5.0.10.RELEASE]
	... 68 common frames omitted

访问路径============/user/getUserById   //这是第二次请求
class=======class java.util.HashMap
o 的value====={"result":0,"msg":"获取订单列表成功","data":{}
请求数据===========null
判断结果{"msg":"非法参数","result":99}

现状

为了校验body和header，所以自定义了一个Filter，但是这个filter存在第一次调用无法获取body的bug，所以只好使用下面的方案。

首先定义一个filter，在这个Filter中获取body，实现方式和官方的ModifyRequestBodyGatewayFilterFactory类几乎一样，在这个实现中，把读取到的body放到header中，如下：

 public GatewayFilter apply(Config config) {
        return (exchange, chain) -> {

            ServerRequest request = new DefaultServerRequest(exchange);


            Class inClass = config.getInClass();

            Gson gson = new Gson();
            AtomicReference<String> bodyStr = new AtomicReference<>();
            Mono<?> modifiedBody = request.bodyToMono(inClass).flatMap(o -> {

                bodyStr.set(gson.toJson(o));
                return config.rewriteFunction.apply(exchange, o);
            });



            BodyInserter bodyInserter = BodyInserters.fromPublisher(modifiedBody, config.outClass);
            CachedBodyOutputMessage outputMessage = new CachedBodyOutputMessage(exchange, exchange.getRequest().getHeaders());



            HttpHeaders headers = new HttpHeaders();
            headers.putAll(exchange.getRequest().getHeaders());
            headers.remove("Content-Length");
            if (config.getContentType() != null) {
                headers.set("Content-Type", config.getContentType());
            }


            return bodyInserter.insert(outputMessage, new BodyInserterContext()).then(Mono.defer(() -> {
                ServerHttpRequestDecorator decorator = new ServerHttpRequestDecorator(exchange.getRequest()) {
                    public HttpHeaders getHeaders() {

                        String str = bodyStr.get();
                        System.out.println("str===========" + str); // 这里

                        long contentLength = headers.getContentLength();
                        HttpHeaders httpHeaders = new HttpHeaders();
                        httpHeaders.putAll(super.getHeaders());
                        httpHeaders.set("bodystr", str); // 这里
                        if (contentLength > 0L) {
                            httpHeaders.setContentLength(contentLength);
                        } else {
                            httpHeaders.set("Transfer-Encoding", "chunked");
                        }

                        return httpHeaders;
                    }

                    public Flux<DataBuffer> getBody() {
                        return outputMessage.getBody();
                    }
                };
                return chain.filter(exchange.mutate().request(decorator).build());
            }));
        };
    }

然后在校验数据的Filter中不再获取body，直接从header中获取，完成校验，这样就基本实现我的需求了。

疑问

• 为什么第一次请求无法执行
• 我现在使用的两种方案是不是不合适，有没有其它的实现方案。

linux 文件系统是区分大小写的

[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.blueskykong:cloud-book:1.0-SNAPSHOT (/home/wujiatong/gitlab/cloud-book/pom.xml) has 1 error
[ERROR] Child module /home/wujiatong/gitlab/cloud-book/chapter5-openfeign of /home/wujiatong/gitlab/cloud-book/pom.xml does not exist
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]

请将chapter5-openFeign 文件夹名修改成 chapter5-openfeign

关于原书101页中ParseHandlerByName.java的讲解

作者您好！读到此章时发现一些问题，不知是否为个人理解的问题，如有时间，烦请解答一下
问题为：ParseHandlerByName.java源代码中对于contract.parseAndValidatateMetadata(key.type())的函数返回值为List，但后面讲解时SpringMvcContract中此函数的返回值为MethodMetadata，并没有返回值为List的函数，但在BaseContract中有返回值为List的函数，不知此处是否并没有调用SpringMvcContract的函数，而是直接调用的BaseContract中的函数？

Whitelabel Error Page

hello，I down the code, and run the chapter4-eurkea.when i type http://localhost:8765/ask in my browser,i get the error

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sun Dec 15 18:58:43 CST 2019
There was an unexpected error (type=Internal Server Error, status=500).
I/O error on GET request for "http://EUREKA-CLIENT-SERVICE/hello/eureka-client": Unexpected end of file from server; nested exception is java.net.SocketException: Unexpected end of file from server

my os is MAC, java version is 1.8. can you tell mw how to solve the error? thank you

关于本书的一点吐槽

作者在本书中跟我们埋了很多坑，根据案例很多情况下运行报错，12章12.1.5访问受限资源
授权码类型请求
书上写的是
http://localhost:8766/oauth/authorize?client_id=client&response_type=code&redirect_uri=http://localhost:8888/login
参数中回调地址写的是http://localhost:8888/login，然后你认证服务器AuthorizationServerConfig中配置的回调地址为 http://localhost:8888/
@OverRide
public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
clients.inMemory().withClient("client")
.authorizedGrantTypes("authorization_code","password", "refresh_token")
.scopes("all")
.secret("secret")
.redirectUris("http://localhost:8888/")
;
}
请求中带的回调地址和你后台配置的都不一样，怎么可能正常访问到请求授权页面？？？
应该会报错
error="invalid_grant", error_description="Invalid redirect: http://localhost:8888/login does not match one of the registered values."
这种情况让我困扰了很久！！！！！

12章配置jwt转换器出错

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerEndpointsConfiguration': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Cannot configure enpdoints
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:139) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:419) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1737) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.2.RELEASE.jar:2.1.2.RELEASE]
at com.cloud.authorizationserver.AuthorizationServerApplication.main(AuthorizationServerApplication.java:10) [classes/:na]
Caused by: java.lang.IllegalStateException: Cannot configure enpdoints
at org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerEndpointsConfiguration.init(AuthorizationServerEndpointsConfiguration.java:81) ~[spring-security-oauth2-2.3.5.RELEASE.jar:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 18 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'accessTokenConverter' defined in class path resource [com/cloud/authorizationserver/config/AuthorizationServerConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter]: Factory method 'accessTokenConverter' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/security/jwt/crypto/sign/MacSigner
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1288) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.resolveBeanReference(ConfigurationClassEnhancer.java:394) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:366) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at com.cloud.authorizationserver.config.AuthorizationServerConfig$$EnhancerBySpringCGLIB$$ec3a246f.accessTokenConverter() ~[classes/:na]
at com.cloud.authorizationserver.config.AuthorizationServerConfig.configure(AuthorizationServerConfig.java:36) ~[classes/:na]
at org.springframework.security.oauth2.config.annotation.web.configuration.AuthorizationServerEndpointsConfiguration.init(AuthorizationServerEndpointsConfiguration.java:79) ~[spring-security-oauth2-2.3.5.RELEASE.jar:na]
... 25 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter]: Factory method 'accessTokenConverter' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/security/jwt/crypto/sign/MacSigner
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 39 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/security/jwt/crypto/sign/MacSigner
at org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverter.(JwtAccessTokenConverter.java:74) ~[spring-security-oauth2-2.3.5.RELEASE.jar:na]
at com.cloud.authorizationserver.config.AuthorizationServerConfig.accessTokenConverter(AuthorizationServerConfig.java:41) ~[classes/:na]
at com.cloud.authorizationserver.config.AuthorizationServerConfig$$EnhancerBySpringCGLIB$$ec3a246f.CGLIB$accessTokenConverter$3() ~[classes/:na]
at com.cloud.authorizationserver.config.AuthorizationServerConfig$$EnhancerBySpringCGLIB$$ec3a246f$$FastClassBySpringCGLIB$$297b96cd.invoke() ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.4.RELEASE.jar:5.1.4.RELEASE]
at com.cloud.authorizationserver.config.AuthorizationServerConfig$$EnhancerBySpringCGLIB$$ec3a246f.accessTokenConverter() ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.4.RELEASE.jar:5.1.4.RELEASE]
... 40 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.security.jwt.crypto.sign.MacSigner
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_101]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_101]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[na:1.8.0_101]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_101]
... 52 common frames omitted

第七章代码示例

请问作者：第七章代码示例说明了在没有eureka的使用情况。该如何进行本地测试？以及官网代码直接copy过来如何进行运行？

第四章eureka.instance.hostname配置问题

在书上p42-p43的配置中有eureka.instance.hostname=client的配置
我配了这个之后访问 /say 就会报java.net.UnknownHostException: client 这个错。
但是看到github源码里并没有这个配置。我把这个删了就正常了。这个是什么问题呢？

还有p44 2.服务间调用 那个地方 应该是调用8765这个端口吧 书上写的8762