apache camel helloWorld

最新推荐文章于 2021-09-19 09:53:20 发布

原创最新推荐文章于 2021-09-19 09:53:20 发布 · 164 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java

本文介绍了一个使用 Apache Camel 的 Java 示例项目，通过自定义处理器处理 HTTP 请求并获取 JVM 信息。该示例展示了如何配置 Camel 路由，实现定时任务触发 HTTP 请求，并处理响应。

ProcessorImpl

package com.jxt.camelDemo;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.http.common.HttpMessage;
import org.apache.camel.util.json.JsonObject;

import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Map;

public class ProcessorImpl implements Processor {
    public void process(Exchange exchange) throws Exception {
        HttpServletRequest httpServletRequest = exchange.getIn().getBody(HttpServletRequest.class);
        Map<String, String[]> parameterMap = httpServletRequest.getParameterMap();
        System.out.println(parameterMap.toString());
        HttpMessage message = (HttpMessage)exchange.getIn();
        InputStream bodyStream = (InputStream)message.getBody();
        String inputContext =  this.analysisMessage(bodyStream);
        bodyStream.close();
        System.out.println(inputContext);
        SimpleDateFormat dateFormat = new SimpleDateFormat("YYYY-MM-DD HH-mm-ss");
        JsonObject jsonObject = new JsonObject();
        jsonObject.put("errorCode",0);
        jsonObject.put("msg","OK");
        exchange.getMessage().setBody(jsonObject.toJson());
    }

    private String analysisMessage(InputStream bodyStream) throws IOException, IOException {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] contextBytes = new byte[outStream.size()];
        int realLen;
        while((realLen = bodyStream.read(contextBytes , 0 ,outStream.size())) != -1) {
            outStream.write(contextBytes, 0, realLen);
        }
// 返回从Stream中读取的字串
        try {
            return new String(outStream.toByteArray() , "UTF-8");
        } finally {
            outStream.close();
        }
    }
}

MyRoute

import org.apache.camel.Exchange;
import org.apache.camel.builder.RouteBuilder;

public class MyRoute extends RouteBuilder {

    public void configure() throws Exception {
        from("timer://queryAward?period=5s&repeatCount=1")
                .setHeader(Exchange.HTTP_METHOD, constant("POST"))
                .to("http://39.98.60.120:5050/getJvmInfo").process(new ProcessorImpl())
                .to("log:getJvmInfo?showExchangeId=false");
    }
}

DemoMain

import org.apache.camel.CamelContext;
import org.apache.camel.impl.DefaultCamelContext;

public class DemoMain {
    public static void main(String[] args) throws Exception {
        CamelContext context = new DefaultCamelContext();
        MyRoute route = new MyRoute();
        context.addRoutes(route);
        context.start();
        synchronized (DemoMain.class) {
            DemoMain.class.wait();
        }
        context.stop();
    }
}