本篇内容介绍了“如何解决Java Socket通信技术收发线程互斥的问题”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
Java Socket通信技术在很长的时间里都在使用，在不少的程序员眼中都有很多高的评价。那么下面我们就看看如何才能掌握这门复杂的编程语言，希望大家在今后的Java Socket通信技术使用中有所收获。
下面就是Java Socket通信技术在解决收发线程互斥的代码介绍。
package com.bill99.svr;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.log4j.Logger;
/**
*<p>title: socket通信包装类</p>
*<p>Description: </p>
*<p>CopyRight: CopyRight (c) 2009</p>
*<p>Company: 99bill.com</p>
*<p>Create date: 2009-10-14</P>
*author sunnylocus<A href="mailto:sunnylocus@163.com">
</A> * v0.10 2009-10-14 初类
* v0.11 2009-11-12 对命令收发逻辑及收发线程互斥机制进行了优化，
处理命令速度由原来8~16个/秒提高到25~32个/秒*/ public class SocketConnection {
private volatile Socket socket;
private int timeout = 1000*10; //超时时间，初始值10秒
private boolean isLaunchHeartcheck = false;//是否已启动心跳检测
private boolean isNetworkConnect = false; //网络是否已连接
private static String host = "";
private static int port;
static InputStream inStream = null;
static OutputStream outStream = null;
private static Logger log =Logger.getLogger
(SocketConnection.class);private static SocketConnection socketConnection = null;
private static java.util.Timer heartTimer=null;
//private final Map<String, Object> recMsgMap= Collections.
synchronizedMap(new HashMap<String, Object>());private final ConcurrentHashMap<String, Object> recMsgMap
= new ConcurrentHashMap<String, Object>();private static Thread receiveThread = null;
private final ReentrantLock lock = new ReentrantLock();
private SocketConnection(){
Properties conf = new Properties();
try {
conf.load(SocketConnection.class.getResourceAsStream
("test.conf"));this.timeout = Integer.valueOf(conf.getProperty("timeout"));
init(conf.getProperty("ip"),Integer.valueOf
(conf.getProperty("port")));} catch(IOException e) {
log.fatal("socket初始化异常!",e);
throw new RuntimeException("socket初始化异常,请检查配置参数");
}
}
/**
* 单态模式
*/
public static SocketConnection getInstance() {
if(socketConnection==null) {
synchronized(SocketConnection.class) {
if(socketConnection==null) {
socketConnection = new SocketConnection();
return socketConnection;
}
}
}
return socketConnection;
}
private void init(String host,int port) throws IOException {
InetSocketAddress addr = new InetSocketAddress(host,port);
socket = new Socket();
synchronized (this) {
log.info("【准备与"+addr+"建立连接】");
socket.connect(addr, timeout);
log.info("【与"+addr+"连接已建立】");
inStream = socket.getInputStream();
outStream = socket.getOutputStream();
socket.setTcpNoDelay(true);//数据不作缓冲，立即发送
socket.setSoLinger(true, 0);//socket关闭时，立即释放资源
socket.setKeepAlive(true);
socket.setTrafficClass(0x04|0x10);//高可靠性和最小延迟传输
isNetworkConnect=true;
receiveThread = new Thread(new ReceiveWorker());
receiveThread.start();
SocketConnection.host=host;
SocketConnection.port=port;
if(!isLaunchHeartcheck)
launchHeartcheck();
}
}
/**
* 心跳包检测
*/
private void launchHeartcheck() {
if(socket == null)
throw new IllegalStateException("socket is not
established!");heartTimer = new Timer();
isLaunchHeartcheck = true;
heartTimer.schedule(new TimerTask() {
public void run() {
String msgStreamNo = StreamNoGenerator.getStreamNo("kq");
int mstType =9999;//999-心跳包请求
SimpleDateFormat dateformate = new SimpleDateFormat
("yyyyMMddHHmmss");String msgDateTime = dateformate.format(new Date());
int msgLength =38;//消息头长度
String commandstr = "00" +msgLength + mstType + msgStreamNo;
log.info("心跳检测包 -> IVR "+commandstr);
int reconnCounter = 1;
while(true) {
String responseMsg =null;
try {
responseMsg = readReqMsg(commandstr);
} catch (IOException e) {
log.error("IO流异常",e);
reconnCounter ++;
}
if(responseMsg!=null) {
log.info("心跳响应包 <- IVR "+responseMsg);
reconnCounter = 1;
break;
} else {
reconnCounter ++;
}
if(reconnCounter >3) {//重连次数已达三次，判定网络连接中断，
重新建立连接。连接未被建立时不释放锁reConnectToCTCC(); break;
}
}
}
},1000 * 60*1,1000*60*2);
}
/**
* 重连与目标IP建立重连
*/
private void reConnectToCTCC() {
new Thread(new Runnable(){
public void run(){
log.info("重新建立与"+host+":"+port+"的连接");
//清理工作，中断计时器，中断接收线程，恢复初始变量
heartTimer.cancel();
isLaunchHeartcheck=false;
isNetworkConnect = false;
receiveThread.interrupt();
try {
socket.close();
} catch (IOException e1) {log.error("重连时，关闭socket连
接发生IO流异常",e1);}//----------------
synchronized(this){
for(; ;){
try {
Thread.currentThread();
Thread.sleep(1000 * 1);
init(host,port);
this.notifyAll();
break ;
} catch (IOException e) {
log.error("重新建立连接未成功",e);
} catch (InterruptedException e){
log.error("重连线程中断",e);
}
}
}
}
}).start();
}
/**
* 发送命令并接受响应
* @param requestMsg
* @return
* @throws SocketTimeoutException
* @throws IOException
*/
public String readReqMsg(String requestMsg) throws IOException {
if(requestMsg ==null) {
return null;
}
if(!isNetworkConnect) {
synchronized(this){
try {
this.wait(1000*5); //等待5秒，如果网络还没有恢复，抛出IO流异常
if(!isNetworkConnect) {
throw new IOException("网络连接中断！");
}
} catch (InterruptedException e) {
log.error("发送线程中断",e);
}
}
}
String msgNo = requestMsg.substring(8, 8 + 24);//读取流水号
outStream = socket.getOutputStream();
outStream.write(requestMsg.getBytes());
outStream.flush();
Condition msglock = lock.newCondition(); //消息锁
//注册等待接收消息
recMsgMap.put(msgNo, msglock);
try {
lock.lock();
msglock.await(timeout,TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
log.error("发送线程中断",e);
} finally {
lock.unlock();
}
Object respMsg = recMsgMap.remove(msgNo); //响应信息
if(respMsg!=null &&(respMsg != msglock)) {
//已经接收到消息，注销等待，成功返回消息
return (String) respMsg;
} else {
log.error(msgNo+" 超时，未收到响应消息");
throw new SocketTimeoutException(msgNo+" 超时，未收到响应消息");
}
}
public void finalize() {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
//消息接收线程
private class ReceiveWorker implements Runnable {
String intStr= null;
public void run() {
while(!Thread.interrupted()){
try {
byte[] headBytes = new byte[4];
if(inStream.read(headBytes)==-1){
log.warn("读到流未尾，对方已关闭流!");
reConnectToCTCC();//读到流未尾，对方已关闭流
return;
}
byte[] tmp =new byte[4];
tmp = headBytes;
String tempStr = new String(tmp).trim();
if(tempStr==null || tempStr.equals("")) {
log.error("received message is null");
continue;
}
intStr = new String(tmp);
int totalLength =Integer.parseInt(intStr);
//----------------
byte[] msgBytes = new byte[totalLength-4];
inStream.read(msgBytes);
String resultMsg = new String(headBytes)+ new
String(msgBytes);//抽出消息ID
String msgNo = resultMsg.substring(8, 8 + 24);
Condition msglock =(Condition) recMsgMap.get(msgNo);
if(msglock ==null) {
log.warn(msgNo+"序号可能已被注销！响应消息丢弃");
recMsgMap.remove(msgNo);
continue;
}
recMsgMap.put(msgNo, resultMsg);
try{
lock.lock();
msglock.signalAll();
}finally {
lock.unlock();
}
}catch(SocketException e){
log.error("服务端关闭socket",e);
reConnectToCTCC();
} catch(IOException e) {
log.error("接收线程读取响应数据时发生IO流异常",e);
} catch(NumberFormatException e){
log.error("收到没良心包，String转int异常，异常字符:"+intStr);
}
}
}
}
}
“如何解决Java Socket通信技术收发线程互斥的问题”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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