java 读取tomcat日志

JAVA读取tomcat日志

添加maven依赖

        
            javax.websocket
            javax.websocket-api
            1.1
            provided
        

建立socket

package com.ghgcn.cigarbox.manager.action;

import java.io.InputStream;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.ghgcn.cigarbox.manager.thread.TailLogThread;
import com.ghgcn.cigarbox.support.SysParam;




/**
 * 
 * @ClassName: LogWebSocketHandle
 * @Description: TODO(这里用一句话描述这个类的作用)
 * @author 刘楠
 * @date 2017年9月11日 下午7:17:03
 *
 */
@ServerEndpoint("/sys/log")
public class LogWebSocketHandle {
    
    private Logger logger =LoggerFactory.getLogger(LogWebSocketHandle.class);
    private Process process;
    
    private InputStream inputStream;
    
    /**
     * 开启websocket
     * Description : 
     * @param session
     */
    @OnOpen
    public void onOpen(Session session){
        try {
            logger.debug("=========================开启websocket========================================");
            //执行tail -f 命令
            process = Runtime.getRuntime().exec("tail -f "+SysParam.gettomcatLog());
            inputStream = process.getInputStream();
            
            //一定要启动新线程，防止inputstream 阻塞处理websocket的线程
            TailLogThread thread = new TailLogThread(inputStream, session);
            thread.start();
        } catch (Exception e) {
            //e.printStackTrace();
            logger.debug("onOpen   {}",e.getMessage());
        }
    }
    
    /**
     * 关闭websocket
     * Description :
     */
    @OnClose
    public void onClose(){
        logger.debug("=========================关闭websocket========================================");
        try {
            if(inputStream != null){
                inputStream.close();
            }
        } catch (Exception e) {
            //e.printStackTrace();
            logger.debug("onClose  {}",e.getMessage());
        }
        if(process != null){
            process.destroy();
        }
    }
    
    @OnError
    public void onError(Throwable thr){
        //thr.printStackTrace();
        logger.debug("onError {}",thr.getMessage());
    }
    
}

建立线程

package com.ghgcn.cigarbox.manager.thread;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import javax.websocket.Session;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.ghgcn.cigarbox.manager.action.LogWebSocketHandle;



/**
 * 
 * @ClassName: TailLogThread
 * @Description: TODO(这里用一句话描述这个类的作用)
 * @author 刘楠
 * @date 2017年9月11日 下午7:16:55
 *
 */
public class TailLogThread extends Thread{
    
    private BufferedReader reader;
    private Session session;
     private Logger logger =LoggerFactory.getLogger(TailLogThread.class);
    public TailLogThread(InputStream in, Session session) {
        this.reader = new BufferedReader(new InputStreamReader(in));
        this.session = session;
    }

    
    @Override
    public void run() {
        logger.debug("============thread start===============");
        String line;
        try {
            while((line = reader.readLine()) != null){
                //将实时日志通过websocket发送到客户端，给每一行添加一个HTML换行
                session.getBasicRemote().sendText(line + "
");
            }
        } catch (Exception e) {
            //e.printStackTrace();
            logger.debug("TailLogThread run   {}",e.getMessage());
        }
        super.run();
    }
    
    

}

前端 页面 index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<% String ctx = request.getContextPath();
  pageContext.setAttribute("ctx", ctx);
%>










    

访问

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