关于java socket的一些总结：
Java Socket通信有很多的时候需要我们不断的学习。方面效率虽然不及C与C++但它以灵活语言优势，为大家广为使用。 本文就对在使用java做通信方面程序时候应改注意问题做以说明。
1.长连接、短链接只是针对客户端而言，服务器无所谓长、短；
2.无论同步或者异步通信，发送之后务必要又响应回复，确认收到，负责进行一定范围内重发，例如重发三次；
3.长连接服务器与客户端之间务必需要心跳探测，由客户端主动发起；
4.短连接服务器通用代码：
package com.biesan.sms.gate.unioncom.communication;
import com.biesan.commons.Constants;
import com.biesan.commons.util.CodeUtil;
import com.biesan.sms.gate.unioncom.data.*;
import com.biesan.sms.gate.unioncom.util.GateInfo;
import java.net.*;
import java.io.*;
import java.util.*;
import org.apache.log4j.*;
import spApi.*;
public class UnioncomDeliver extends Thread {
// stop flag
private boolean unInterrupt = true;
private boolean unErr = true;
//private boolean closeSocketFlag = false;
// server socket
private ServerSocket serverSo = null;
// current socket
private Socket so = null
private OutputStream output = null;
private InputStream input = null;
// gate command
private SGIP_Command tmpCmd = null;
private SGIP_Command cmd = null;
private Bind bind = null;
private BindResp bindResp = null;
//private Unbind unBind = null;
private UnbindResp unBindResp = null;
private boolean unAcceptErrorFlag = true;
Logger unioncomLog = Logger.getLogger(Unioncom
Deliver.class.getName());
public UnioncomDeliver() {
}
public void run() {
unioncomLog.info("Start...");
while (unInterrupt) {
this.initServer();
this.startServices();
while (this.unAcceptErrorFlag) {
try {
//接受连接请求
unioncomLog.info("before accept connection!.......
FreeMemroy :" + Runtime.getRuntime().freeMemory());
this.acceptConnection();
unioncomLog.info("after accept connection!.......
FreeMemroy :" + Runtime.getRuntime().freeMemory());
while (unErr) {
cmd = new Command();
unioncomLog.info("before read command from stream
........... FreeMemroy: " + Runtime.getRuntime().
freeMemory());
tmpCmd = cmd.read(input);
unioncomLog.info("after read command from stream " +
getCommandString(cmd.getCommandID()) + " FreeMemroy: " +
Runtime.getRuntime().freeMemory());
if (tmpCmd == null) {
unErr = false;
break;
}
switch (cmd.getCommandID()) {
// biad ready communication
case SGIP_Command.ID_SGIP_BIND: {
this.dealBind();
break;
}// exit bind
case SGIP_Command.ID_SGIP_UNBIND: {
this.dealUnBind();
unioncomLog.info("after unbind connection!.......
FreeMemroy :" + Runtime.getRuntime().freeMemory());
break;
}// deliver
....
default : //错误的命令字
break;
}// switch
}// while(unErr)
} catch (Exception e) {
unioncomLog.error("Unioncom Recv Service Error"
+ e.getMessage());
} finally {
if (this.so != null) {
this.closeSocket();
}
this.unErr = true;
}
}// while (this.unAcceptErrorFlag)
try {
this.closeServerSocket();
sleep(200);// sleep
} catch (InterruptedException ie) {
}
}// while(unInterrupt)
}
private String getCommandString(int cmd){
switch (cmd) {
// biad ready communication
case SGIP_Command.ID_SGIP_BIND: {
return " BIND COMMAND ";
}// exit bind
case SGIP_Command.ID_SGIP_UNBIND: {
return " UNBIND COMMAND ";
}// deliver
case ...
default:
return " UNKNOWN COMMAND";
}
}
private void dealBind() {
try {
bind = new Bind(tmpCmd);
if (bind.readbody() != 0) {
unioncomLog.warn("Read Bind error");
this.unErr = false;
}
bindResp = new BindResp(tmpCmd.getMsgHead());
bindResp.SetResult(0);
bindResp.write(output);
unioncomLog.debug("Bind success!");
} catch (Exception e) {
unioncomLog.error("Dela Union Recv Bind Error!" +
e.getMessage());
this.unErr = false;
}
}
private void dealUnBind() {
try {
//unBind = (Unbind) tmpCmd;
unBindResp = new UnbindResp(tmpCmd.getMsgHead());
unBindResp.write(output);
unioncomLog.debug("UnBind success!");
} catch (Exception e) {
unioncomLog.warn("Unbind error!" + e.getMessage());
}
this.unErr = false;
}
private void startServices() {
boolean unStartServices = true;
while (unStartServices) {
try {
serverSo = new ServerSocket(ugInfo.getLocalServerPort(), 5,
InetAddress.getByName(ugInfo.getLocalIpAdd()));
//serverSo.setSoTimeout(60000);
unStartServices = false;
unioncomLog.info("Create union recv socket Ok!");
} catch (IOException e) {
unioncomLog.warn("Create union recv socket error!"
+ e.getMessage());
unStartServices = true;
UnioncomSubmit.thrSlp(3000);
}
}
}
private void acceptConnection() {
// Accept 失败
try {
so = serverSo.accept();
so.setSoTimeout(10000);
} catch (Exception e) {
unioncomLog.warn("Accept Error!" + e.getMessage());
this.closeServerSocket();
this.unAcceptErrorFlag = false;
this.unErr=false;
}
// Accept成功
try {
input = so.getInputStream();
output = so.getOutputStream();
} catch (IOException e) {
unioncomLog.warn("Get I/O stream Error!" + e.getMessage());
this.closeService();
this.unAcceptErrorFlag = false;
this.unErr=false;
}
}
private void closeSocket() {
try {
so.close();
unioncomLog.info("Socket Close Success!!!");
} catch (Exception e) {
unioncomLog.error("Socket Close Failure!!!" + e.getMessage());
}
}
private void closeServerSocket() {
try {
serverSo.close();
unioncomLog.info("ServerSocket Close Success!!!");
} catch (Exception e) {
unioncomLog
.error("ServerSocket Close Failure!!!" + e.getMessage());
}
}
private void closeService() {
this.closeSocket();
this.closeServerSocket();
}
private void initServer() {
this.bind = null;
this.bindResp = null;
//this.unBind = null;
this.unBindResp = null;
this.tmpCmd = null;
this.cmd = null;
this.serverSo = null;
this.so = null;
this.output = null;
this.input = null;
this.unErr = true;
//this.closeSocketFlag = false;
unioncomLog.info("Memory***==="
+ java.lang.Runtime.getRuntime().freeMemory());
}
public synchronized void requireStop() {
this.unInterrupt = false;
unioncomLog.info("Requre interrupt!!!");
}
public String convertMsgContentCoding
(int msgCoding, byte[] msgContent) {
String deliverContent = null;
try {
if (msgContent != null) {
if (msgCoding == 8) { // 处理ucs32编码
deliverContent = new String(msgContent,
"UnicodeBigUnmarked");
} else if (msgCoding == 0) { // 处理ASCII编码
deliverContent = new String(msgContent, "ASCII");
} else if (msgCoding == 4) { // 处理binary编码
deliverContent = new String(msgContent);
} else if (msgCoding == 15) { // 处理GBK编码
deliverContent = new String(msgContent, "GBK");
// 处理DELIVER数据包的短信息ID
} else {
unioncomLog.error("编码格式错误!");
return "";
}
} else
return "";
return deliverContent;
} catch (UnsupportedEncodingException ex) {
unioncomLog.error("deal content error!" +
ex.getMessage());
return "";
}
}
}
以上就是对Java Socket通信的详细介绍。
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