如何解决Java Socket通信技术收发线程互斥的问题

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。

1. packagecom.bill99.svr; 

2. importjava.io.IOException; 

3. importjava.io.InputStream; 

4. importjava.io.OutputStream; 

5. importjava.net.InetSocketAddress; 

6. importjava.net.Socket; 

7. importjava.net.SocketException; 

8. importjava.net.SocketTimeoutException; 

9. importjava.text.SimpleDateFormat; 

10. importjava.util.Date; 

11. importjava.util.Properties; 

12. importjava.util.Timer; 

13. importjava.util.TimerTask; 

14. importjava.util.concurrent.ConcurrentHashMap; 

15. importjava.util.concurrent.TimeUnit; 

16. importjava.util.concurrent.locks.Condition; 

17. importjava.util.concurrent.locks.ReentrantLock; 

18. importorg.apache.log4j.Logger; 

19. /** 

20. *<p>title:socket通信包装类</p> 

21. *<p>Description:</p> 

22. *<p>CopyRight:CopyRight(c)2009</p> 

23. *<p>Company:99bill.com</p> 

24. *<p>Createdate:2009-10-14</P> 

25. *authorsunnylocus<Ahref="mailto:sunnylocus@163.com"> 

26. </A>*v0.102009-10-14初类 

27. *v0.112009-11-12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. */publicclassSocketConnection{ 

29. privatevolatileSocketsocket; 

30. privateinttimeout=1000*10;//超时时间，初始值10秒 

31. privatebooleanisLaunchHeartcheck=false;//是否已启动心跳检测 

32. privatebooleanisNetworkConnect=false;//网络是否已连接 

33. privatestaticStringhost=""; 

34. privatestaticintport; 

35. staticInputStreaminStream=null; 

36. staticOutputStreamoutStream=null; 

37. privatestaticLoggerlog=Logger.getLogger

(SocketConnection.class); 

38. privatestaticSocketConnectionsocketConnection=null; 

39. privatestaticjava.util.TimerheartTimer=null;  

40. //privatefinalMap<String,Object>recMsgMap=Collections.

synchronizedMap(newHashMap<String,Object>()); 

41. privatefinalConcurrentHashMap<String,Object>recMsgMap

=newConcurrentHashMap<String,Object>(); 

42. privatestaticThreadreceiveThread=null; 

43. privatefinalReentrantLocklock=newReentrantLock(); 

44. privateSocketConnection(){ 

45. Propertiesconf=newProperties(); 

46. try{ 

47. conf.load(SocketConnection.class.getResourceAsStream

("test.conf")); 

48. this.timeout=Integer.valueOf(conf.getProperty("timeout")); 

49. init(conf.getProperty("ip"),Integer.valueOf

(conf.getProperty("port"))); 

50. }catch(IOExceptione){ 

51. log.fatal("socket初始化异常!",e); 

52. thrownewRuntimeException("socket初始化异常,请检查配置参数"); 

53. } 

54. } 

55. /** 

56. *单态模式 

57. */ 

58. publicstaticSocketConnectiongetInstance(){ 

59. if(socketConnection==null){ 

60. synchronized(SocketConnection.class){ 

61. if(socketConnection==null){ 

62. socketConnection=newSocketConnection(); 

63. returnsocketConnection; 

64. } 

65. } 

66. } 

67. returnsocketConnection; 

68. } 

69. privatevoidinit(Stringhost,intport)throwsIOException{ 

70. InetSocketAddressaddr=newInetSocketAddress(host,port); 

71. socket=newSocket(); 

72. synchronized(this){ 

73. log.info("【准备与"+addr+"建立连接】"); 

74. socket.connect(addr,timeout); 

75. log.info("【与"+addr+"连接已建立】"); 

76. inStream=socket.getInputStream(); 

77. outStream=socket.getOutputStream(); 

78. socket.setTcpNoDelay(true);//数据不作缓冲，立即发送 

79. socket.setSoLinger(true,0);//socket关闭时，立即释放资源 

80. socket.setKeepAlive(true); 

81. socket.setTrafficClass(0x04|0x10);//高可靠性和最小延迟传输 

82. isNetworkConnect=true; 

83. receiveThread=newThread(newReceiveWorker()); 

84. receiveThread.start(); 

85. SocketConnection.host=host; 

86. SocketConnection.port=port; 

87. if(!isLaunchHeartcheck) 

88. launchHeartcheck(); 

89. } 

90. } 

91. /** 

92. *心跳包检测 

93. */ 

94. privatevoidlaunchHeartcheck(){ 

95. if(socket==null) 

96. thrownewIllegalStateException("socketisnot

established!"); 

97. heartTimer=newTimer(); 

98. isLaunchHeartcheck=true; 

99. heartTimer.schedule(newTimerTask(){ 

100. publicvoidrun(){ 

101. StringmsgStreamNo=StreamNoGenerator.getStreamNo("kq"); 

102. intmstType=9999;//999-心跳包请求 

103. SimpleDateFormatdateformate=newSimpleDateFormat

("yyyyMMddHHmmss"); 

104. StringmsgDateTime=dateformate.format(newDate()); 

105. intmsgLength=38;//消息头长度 

106. Stringcommandstr="00"+msgLength+mstType+msgStreamNo; 

107. log.info("心跳检测包->IVR"+commandstr); 

108. intreconnCounter=1; 

109. while(true){ 

110. StringresponseMsg=null; 

111. try{ 

112. responseMsg=readReqMsg(commandstr); 

113. }catch(IOExceptione){ 

114. log.error("IO流异常",e); 

115. reconnCounter++; 

116. } 

117. if(responseMsg!=null){ 

118. log.info("心跳响应包<-IVR"+responseMsg); 

119. reconnCounter=1; 

120. break; 

121. }else{ 

122. reconnCounter++; 

123. } 

124. 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 

125. reConnectToCTCC();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. */ 

134. privatevoidreConnectToCTCC(){ 

135. newThread(newRunnable(){ 

136. publicvoidrun(){ 

137. log.info("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 

139. heartTimer.cancel(); 

140. isLaunchHeartcheck=false; 

141. isNetworkConnect=false; 

142. receiveThread.interrupt(); 

143. try{ 

144. socket.close(); 

145. }catch(IOExceptione1){log.error("重连时，关闭socket连
接发生IO流异常",e1);} 

146. //---------------- 

147. synchronized(this){ 

148. for(;;){ 

149. try{ 

150. Thread.currentThread(); 

151. Thread.sleep(1000*1); 

152. init(host,port); 

153. this.notifyAll(); 

154. break; 

155. }catch(IOExceptione){ 

156. log.error("重新建立连接未成功",e); 

157. }catch(InterruptedExceptione){ 

158. log.error("重连线程中断",e); 

159. } 

160. } 

161. } 

162. } 

163. }).start(); 

164. } 

165. /** 

166. *发送命令并接受响应 

167. *@paramrequestMsg 

168. *@return 

169. *@throwsSocketTimeoutException 

170. *@throwsIOException 

171. */ 

172. publicStringreadReqMsg(StringrequestMsg)throwsIOException{ 

173. if(requestMsg==null){ 

174. returnnull; 

175. } 

176. if(!isNetworkConnect){ 

177. synchronized(this){ 

178. try{ 

179. this.wait(1000*5);//等待5秒，如果网络还没有恢复，抛出IO流异常 

180. if(!isNetworkConnect){ 

181. thrownewIOException("网络连接中断！"); 

182. } 

183. }catch(InterruptedExceptione){ 

184. log.error("发送线程中断",e); 

185. } 

186. } 

187. } 

188. StringmsgNo=requestMsg.substring(8,8+24);//读取流水号 

189. outStream=socket.getOutputStream(); 

190. outStream.write(requestMsg.getBytes()); 

191. outStream.flush(); 

192. Conditionmsglock=lock.newCondition();//消息锁 

193. //注册等待接收消息 

194. recMsgMap.put(msgNo,msglock); 

195. try{ 

196. lock.lock(); 

197. msglock.await(timeout,TimeUnit.MILLISECONDS); 

198. }catch(InterruptedExceptione){ 

199. log.error("发送线程中断",e); 

200. }finally{ 

201. lock.unlock(); 

202. } 

203. ObjectrespMsg=recMsgMap.remove(msgNo);//响应信息 

204. if(respMsg!=null&&(respMsg!=msglock)){ 

205. //已经接收到消息，注销等待，成功返回消息 

206. return(String)respMsg; 

207. }else{ 

208. log.error(msgNo+"超时，未收到响应消息"); 

209. thrownewSocketTimeoutException(msgNo+"超时，未收到响应消息"); 

210. } 

211. } 

212. publicvoidfinalize(){ 

213. if(socket!=null){ 

214. try{ 

215. socket.close(); 

216. }catch(IOExceptione){ 

217. e.printStackTrace(); 

218. } 

219. } 

220. } 

221. //消息接收线程 

222. privateclassReceiveWorkerimplementsRunnable{ 

223. StringintStr=null; 

224. publicvoidrun(){ 

225. while(!Thread.interrupted()){ 

226. try{ 

227. byte[]headBytes=newbyte[4]; 

228. if(inStream.read(headBytes)==-1){ 

229. log.warn("读到流未尾，对方已关闭流!"); 

230. reConnectToCTCC();//读到流未尾，对方已关闭流 

231. return; 

232. } 

233. byte[]tmp=newbyte[4]; 

234. tmp=headBytes; 

235. StringtempStr=newString(tmp).trim(); 

236. if(tempStr==null||tempStr.equals("")){ 

237. log.error("receivedmessageisnull"); 

238. continue; 

239. } 

240. intStr=newString(tmp); 

241. inttotalLength=Integer.parseInt(intStr); 

242. //---------------- 

243. byte[]msgBytes=newbyte[totalLength-4]; 

244. inStream.read(msgBytes); 

245. StringresultMsg=newString(headBytes)+new

String(msgBytes); 

246. //抽出消息ID 

247. StringmsgNo=resultMsg.substring(8,8+24); 

248. Conditionmsglock=(Condition)recMsgMap.get(msgNo); 

249. if(msglock==null){ 

250. log.warn(msgNo+"序号可能已被注销！响应消息丢弃"); 

251. recMsgMap.remove(msgNo); 

252. continue; 

253. } 

254. recMsgMap.put(msgNo,resultMsg); 

255. try{ 

256. lock.lock(); 

257. msglock.signalAll(); 

258. }finally{ 

259. lock.unlock(); 

260. } 

261. }catch(SocketExceptione){ 

262. log.error("服务端关闭socket",e); 

263. reConnectToCTCC(); 

264. }catch(IOExceptione){ 

265. log.error("接收线程读取响应数据时发生IO流异常",e); 

266. }catch(NumberFormatExceptione){ 

267. log.error("收到没良心包，String转int异常，异常字符:"+intStr); 

268. } 

269. } 

270. } 

271. } 

272. }

以上就是对Java Socket通信技术中收发线程互斥的详细解决方法。希望大家有所领悟。