怎么用Springboot和Netty实现rpc

这篇文章主要介绍"怎么用Springboot和Netty实现rpc"，在日常操作中，相信很多人在怎么用Springboot和Netty实现rpc问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"怎么用Springboot和Netty实现rpc"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

Springboot、 Netty、动态代理(反射)、反射

项目整体结构如下：

1.在父项目中引入相关依赖；

                    org.springframework.boot            spring-boot-starter-web            2.3.2.RELEASE                            io.netty            netty-all            4.1.48.Final                            com.alibaba            fastjson            1.2.58                            org.slf4j            slf4j-log4j12            2.0.0-alpha1        

2.服务提供模块整体结构如下：

这里重点关注一下 RequestModel 和 ResponseModel 两个消息体类，

@Data@AllArgsConstructorpublic class RequestModel {     private String requestId;    private String serviceName;    private String methodName;    private Class[] paramTypes;    private Object[] paramValues; }

@Data@AllArgsConstructorpublic class ResponseModel {    private String responseId;    private String serviceName;    private String methodName;    private String code;    private String data;}

用于服务端和客户端的数据传输；再者就是关注 ServerChannelInboundHandler 中的 channelRead0() 报文解码处理；

    @Override    protected void channelRead0(ChannelHandlerContext ctx, String msg) {        StringBuilder sb = null;        RequestModel result = null;        try {            // 报文解析处理            sb = new StringBuilder();            result = JSON.parseObject(msg, RequestModel.class);             requestId = result.getRequestId();            String serviceName = result.getServiceName();            String methodName = result.getMethodName();            Class[] paramType = result.getParamTypes();            Object[] paramValue = result.getParamValues();            System.out.println(serviceName + "  " + methodName);            String substring = serviceName.substring(serviceName.lastIndexOf(".") + 1);            String s = substring.substring(0, 1).toLowerCase() + substring.substring(1);            Object serviceObject = applicationContext.getBean(s);            Method method = Class.forName(serviceName).getMethod(methodName, paramType);            Object returnValue = method.invoke(serviceObject, paramValue);            ResponseModel responseModel = new ResponseModel(requestId,serviceName,methodName,"200",JSON.toJSONString(returnValue));            sb.append(JSON.toJSONString(responseModel));            sb.append("\n");            System.out.println(sb.toString());            ctx.writeAndFlush(sb);        } catch (Exception e) {            ResponseModel responseModel = new ResponseModel(requestId,"","","500",e.getMessage());            String errorCode = JSON.toJSONString(responseModel)+"\n";            log.error(errorCode);            ctx.writeAndFlush(errorCode);            log.error("报文解析失败: " + e.getMessage());        }    }

客户端的模块代码如下；

这里重点关注的是 ClientHandler 类中 channelRead0() 方法的处理

 @Override    protected void channelRead0(ChannelHandlerContext ctx, String msg) {        System.out.println("收到服务端消息: " + msg);         ResponseModel responseModel = JSON.parseObject(msg,ResponseModel.class);        String responseId = responseModel.getResponseId();        Promise promise = LocalPromise.promiseMap.remove(responseId);        if(promise != null){            String code = responseModel.getCode();            if(code.equals("200")){                promise.setSuccess(responseModel.getData());            }else{                promise.setFailure(new RuntimeException(responseModel.getData()));            }        }    }

和 AppStart 类中获取获取服务的处理；

private  T getProxyService(Class serviceClass) {        Object service = Proxy.newProxyInstance(serviceClass.getClassLoader(), new Class[]{serviceClass}, new InvocationHandler() {            @Override            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {                Channel channel = NettyClient.getChannel(host, port);                RequestModel requestModel = new RequestModel("100001", method.getDeclaringClass().getName(), method.getName(), method.getParameterTypes(), args);                channel.writeAndFlush(JSON.toJSONString(requestModel) + "\n");                Promise promise = new DefaultPromise(channel.eventLoop());                LocalPromise.promiseMap.put(requestModel.getRequestId(), promise);                 System.out.println(LocalPromise.promiseMap+">>>>>>>>>>>>");                promise.await();                if (promise.isSuccess()) {                    Class returnType = method.getReturnType();                    return JSON.toJavaObject(JSON.parseObject(promise.getNow()+""),returnType);                } else {                    System.out.println(promise.cause());                    return promise.cause();                }            }        });        return (T) service;    }

测试结果：

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