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。
age ;
rt ception;
rt tStream;
rt utStream;
rt SocketAddress;
rt et;
rt etException;
rt etTimeoutException;
rt leDateFormat;
rt ;
rt erties;
rt r;
rt rTask;
rt urrentHashMap;
rt Unit;
rt ition;
rt trantLock;
rt er;
19./**
20.*
title: socket通信包装类
21.*
Description:
22.*
CopyRight: CopyRight (c) 2009
23.*
Company:
24.*
Create date: 2009-10-14
25.*author sunnylocus
26. * v0.10 2009-10-14 初类
27.* 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
28.*/ public class SocketConnection {
ate volatile Socket socket;
ate int timeout = 1000*10; //超时时间，初始值10秒
ate boolean isLaunchHeartcheck = false;//是否已启动心跳检测
ate boolean isNetworkConnect = false; //网络是否已连接
ate static String host = "";
ate static int port;
ic InputStream inStream = null;
ic OutputStream outStream = null;
ate static Logger log =ogger
(s);
ate static SocketConnection socketConnection = null;
ate static r heartTimer=null;
40.//private final Map
synchronizedMap(new HashMap
ate final ConcurrentHashMap
= new ConcurrentHashMap
ate static Thread receiveThread = null;
ate final ReentrantLock lock = new ReentrantLock();
ate SocketConnection(){
erties conf = new Properties();
{
(esourceAsStream
(""));
out = eOf(roperty("timeout"));
(roperty("ip"),eOf
(roperty("port")));
50.} catch(IOException e) {
l("socket初始化异常!",e);
w new RuntimeException("socket初始化异常,请检查配置参数");
53.}
54.}
55./**
56.* 单态模式
57.*/
ic static SocketConnection getInstance() {
(socketConnection==null) {
hronized(s) {
(socketConnection==null) {
etConnection = new SocketConnection();
rn socketConnection;
64.}
65.}
66.}
rn socketConnection;
68.}
ate void init(String host,int port) throws IOException {
SocketAddress addr = new InetSocketAddress(host,port);
et = new Socket();
hronized (this) {
("【准备与"+addr+"建立连接】");
ect(addr, timeout);
("【与"+addr+"连接已建立】");
ream = nputStream();
tream = utputStream();
cpNoDelay(true);//数据不作缓冲，立即发送
oLinger(true, 0);//socket关闭时，立即释放资源
eepAlive(true);
rafficClass(0x04|0x10);//高可靠性和最小延迟传输
tworkConnect=true;
iveThread = new Thread(new ReceiveWorker());
t();
=host;
=port;
(!isLaunchHeartcheck)
chHeartcheck();
89.}
90.}
91./**
92.* 心跳包检测
93.*/
ate void launchHeartcheck() {
(socket == null)
w new IllegalStateException("socket is not
established!");
tTimer = new Timer();
unchHeartcheck = true;
dule(new TimerTask() {
ic void run() {
ng msgStreamNo = treamNo("kq");
mstType =9999;//999-心跳包请求
leDateFormat dateformate = new SimpleDateFormat
("yyyyMMddHHmmss");
ng msgDateTime = at(new Date());
msgLength =38;//消息头长度
ng commandstr = "00" +msgLength + mstType + msgStreamNo;
("心跳检测包 -> IVR "+commandstr);
reconnCounter = 1;
e(true) {
ng responseMsg =null;
{
onseMsg = readReqMsg(commandstr);
113.} catch (IOException e) {
r("IO流异常",e);
nnCounter ++;
116.}
(responseMsg!=null) {
("心跳响应包 <- IVR "+responseMsg);
nnCounter = 1;
k;
121.} else {
nnCounter ++;
123.}
(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
nnectToCTCC(); break;
126.}
127.}
128.}
129.},1000 * 60*1,1000*60*2);
130.}
131./**
132.* 重连与目标IP建立重连
133.*/
ate void reConnectToCTCC() {
Thread(new Runnable(){
ic void run(){
("重新建立与"+host+":"+port+"的连接");
138.//清理工作，中断计时器，中断接收线程，恢复初始变量
el();
unchHeartcheck=false;
tworkConnect = false;
rrupt();
{
e();
145.} catch (IOException e1) {r("重连时，关闭socket连
接发生IO流异常",e1);}
146.//----------------
hronized(this){
(; ;){
{
entThread();
p(1000 * 1);
(host,port);
fyAll();
k ;
155.} catch (IOException e) {
r("重新建立连接未成功",e);
157.} catch (InterruptedException e){
r("重连线程中断",e);
159.}
160.}
161.}
162.}
163.})t();
164.}
165./**
166.* 发送命令并接受响应
167.* @param requestMsg
168.* @return
169.* @throws SocketTimeoutException
170.* @throws IOException
171.*/
ic String readReqMsg(String requestMsg) throws IOException {
(requestMsg ==null) {
rn null;
175.}
(!isNetworkConnect) {
hronized(this){
{
(1000*5); //等待5秒，如果网络还没有恢复，抛出IO流异常
(!isNetworkConnect) {
w new IOException("网络连接中断!");
182.}
183.} catch (InterruptedException e) {
r("发送线程中断",e);
185.}
186.}
187.}
ng msgNo = tring(8, 8 + 24);//读取流水号
tream = utputStream();
e(ytes());
h();
ition msglock = ondition(); //消息锁
193.//注册等待接收消息
(msgNo, msglock);
{
();
t(timeout,ISECONDS);
198.} catch (InterruptedException e) {
r("发送线程中断",e);
200.} finally {
ck();
202.}
ct respMsg = ve(msgNo); //响应信息
(respMsg!=null &&(respMsg != msglock)) {
205.//已经接收到消息，注销等待，成功返回消息
rn (String) respMsg;
207.} else {
r(msgNo+" 超时，未收到响应消息");
w new SocketTimeoutException(msgNo+" 超时，未收到响应消息");
210.}
211.}
ic void finalize() {
(socket != null) {
{
e();
216.} catch (IOException e) {
tStackTrace();
218.}
219.}
220.}
221.//消息接收线程
ate class ReceiveWorker implements Runnable {
ng intStr= null;
ic void run() {
e(!rrupted()){
{
[] headBytes = new byte[4];
((headBytes)==-1){
("读到流未尾，对方已关闭流!");
nnectToCTCC();//读到流未尾，对方已关闭流
rn;
232.}
[] tmp =new byte[4];
= headBytes;
ng tempStr = new String(tmp)();
(tempStr==null || ls("")) {
r("received message is null");
inue;
239.}
tr = new String(tmp);
totalLength =eInt(intStr);
242.//----------------
[] msgBytes = new byte[totalLength-4];
(msgBytes);
ng resultMsg = new String(headBytes)+ new
String(msgBytes);
246.//抽出消息ID
ng msgNo = tring(8, 8 + 24);
ition msglock =(Condition) (msgNo);
(msglock ==null) {
(msgNo+"序号可能已被注销!响应消息丢弃");
ve(msgNo);
inue;
253.}
(msgNo, resultMsg);
{
();
alAll();
258.}finally {
ck();
260.}
261.}catch(SocketException e){
r("服务端关闭socket",e);
nnectToCTCC();
264.} catch(IOException e) {
r("接收线程读取响应数据时发生IO流异常",e);
266.} catch(NumberFormatException e){
r("收到没良心包，String转int异常，异常字符:"+intStr);
268.}
269.}
270.}
271.}
272.}
