请教各位大神，java socket通信如何实现长连接？

[Guanglew]

如题，多个客户端连接同一个server， 每来一个连接创建一个线程，除了定时发送心跳帧还有别的方法么？如果要使用心跳，心跳间隔最多是多长时间？

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引用 楼主 jacky_wang_123 的回复:

如题，多个客户端连接同一个server， 每来一个连接创建一个线程，除了定时发送心跳帧还有别的方法么？如果要使用心跳，心跳间隔最多是多长时间？ Java socket 多线程

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。希望大家有所帮助 格式不怎么好，自己转一下代码格式

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希望对你以帮助

[Guanglew]

引用 2 楼 yjp198713 的回复:

希望对你以帮助

多谢了， 需认真研读。。。。。

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引用 3 楼 jacky_wang_123 的回复:

引用 2 楼 yjp198713 的回复:希望对你以帮助多谢了， 需认真研读。。。。。

记得给好评啊