Java的多线程+Socket 后台 Ver 2.0
package com.wulala;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class JavaThreadCreationAndRun {
public static void main(String[] args) {
JavaThreadCreationAndRun jtca = new JavaThreadCreationAndRun();
jtca.startServer();
}
public void startServer() {
ServerSocket ss = null;
try {
ss = new ServerSocket(9999);
} catch (IOException e) {
e.printStackTrace();
}
UpdateMySQL updateMySQL;
while (true) {
Socket socket = null;
try {
socket = ss.accept();
updateMySQL = new UpdateMySQL(socket);
Thread thread = new Thread(updateMySQL);
thread.start();
} catch (IOException e1) {
System.out.println("client disconnected");
try {
socket.close();
} catch (IOException e) {
System.out.println("close socket false: " + e.getMessage());
}
}
}
}
//请无视下面这个内部类.
static class Helper implements Runnable {
private final String message;
public Helper(String _message) {
this.message = _message;
}
private void doSomething(String meesage) {
System.out.println("The doSomethig method was executed by thread:" + Thread.currentThread().getName());
System.out.println("Do something with " + message);
}
@Override
public void run() {
for (int i = 0; i < 2; i++) {
doSomething(message);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
把进程的继承类独立出来了:
package com.wulala;
import java.io.IOException;
import java.io.InputStream;
import java.net.Socket;
public class UpdateMySQL extends Thread {
private InputStream is = null;
byte b[] = new byte[1024];
int readCount = 0;
ExecuteDML edml;
public UpdateMySQL(Socket socket) {
edml = new ExecuteDML();
try {
edml.initParam("dbconfig.properties");
} catch (Exception e2) {
System.out.println("init deml fail: " + e2.getMessage());
}
try {
is = socket.getInputStream();
} catch (IOException e1) {
System.out.println("getInputStream exception: " + e1.getMessage());
}
try {
readCount = is.read(b);
System.out.println("readCount is " + readCount);
} catch (IOException e1) {
System.out.println("readCounter fail: " + e1.getMessage());
} catch (Exception e) {
try {
is.close();
} catch (IOException e1) {
System.out.println("is close exeption: " + e1.getMessage());
}
// pw.close();
try {
socket.close();
} catch (IOException e1) {
System.out.println("socket close exeption: " + e1.getMessage());
}
System.out.println("socket exeption: " + e.getMessage());
}
}
@Override
public void run() {
String str;
str = new String(b);
str = str.trim();
System.out.println("Client Socket Message:" + str);
String deviceID = "";
int activate = 0;
if (str.length() > 8 && (str.length() < 15)) {
int insertResult = 0;
// ExecuteDML edml = new ExecuteDML();
deviceID = str.substring(0, 8);
activate = Integer.valueOf(str.substring(8));
try {
insertResult = edml.insertWXData(deviceID, activate);
} catch (Exception e) {
System.out.println("insert problem" + e.getMessage());
}
// System.out.println("deviceID: " + deviceID + " activate: " +
// activate);
}
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
System.out.println("sleep problem..");
}
}
}
重新把多线程看了一下, 现在基本知道怎么监控线程的情况了, 可惜还是没有在Cent OS上面安装Java SDK(公司网速慢成狗), 所以没法在生产用服务器上用jstack监控, 回头想办法把jdk的rpm倒腾到生产服务器上去, 试试监控.
现在主要是用netstat跟ps看状态了, ps看到的总是没问题的, 进程还在, netstat -an|grep 9999看到的如果是一堆的WAIT_TO_CLOSE什么的, 就嗝了.
继续观察吧.
