我有一个程序可以从LIS机器读取和写入数据。我正在从特定端口读取数据并将数据写入数据库表。当我从表中读取数据并将它们添加到Arraylist中时，它正在添加重复记录。我找不到解决方案。
代码如下：
public class PacsMultiThread extends Thread{
private static Logger logger = Logger.getLogger(PacsMultiThread.class);
// instance for Server socket and Socket class
private ServerSocket serverSocket = null;
private Socket socket = null;
ServerParams params = Configuration.getConfig().getServerParams();
PacsMultiThread() {
super("PacsMultiThread");
try {
// listen on local port
serverSocket = new ServerSocket(Configuration.getConfig().getHostParams().getPort());
} catch (IOException e) {
logger.error("Could not listen on port: " + Configuration.getConfig().getServerParams().getPort() + ", " + e);
System.exit(1);
}
}
/*
* thread run method call
* @see java.lang.Thread#run()
* Mohammod Hossain
*/
public void run() {
logger.info("run method is calling... ");
if (serverSocket == null)
return;
while (true) {
try {
socket = serverSocket.accept();
logger.info("connection status: "+ socket.isConnected());
} catch (IOException e) {
logger.error("Accept failed: " + Configuration.getConfig().getServerParams().getPort() + ", " + e);
System.exit(1);
}
try {
// readData();
//calling new Thread for reading data from port
ReadHandler readThread = new ReadHandler(socket);
readThread.start();
// writeData(socket);
//calling new Thread for writing data into port
WriteHandler writeThread = new WriteHandler(socket);
writeThread.start();
} catch (Exception e) {
logger.error(e.getMessage());
}
}
}
public class WriteHandler extends Thread {
private static Logger logger = Logger.getLogger(WriteHandler.class);
private Socket socket;
ServerParams params = Configuration.getConfig().getServerParams();
OutputStream out = null;
public WriteHandler(Socket socketConnection){
super();
this.socket = socketConnection;
}
@Override
public void run() {
writeData(socket);
}
private void writeData(Socket socket){
/*
* calling writeData method for data write to port
* @param Socket socket
*/
logger.info("writeData method is called :: ");
try{
//calling client socket method for connect to server port
// logger.info(" client socket "+socket.getRemoteSocketAddress());
// check data exist in table in HL7001;
List<HL7001> orderList = new ArrayList<HL7001>();
PacsDao pacsDao = new PacsDao();
orderList = pacsDao.getAllOrder();
//PrintWriter pw = new PrintWriter(theOutput, false);
int msgCount = 0;
if(orderList.size() > 0){
for(int i = 0;i<orderList.size();i++){
logger.info("orderList.size(): " + orderList.size());
HL7001 model = orderList.get(i);
logger.info("message from HL7001 Table :: " +"Msg Order No: "+
model.getOrderNo() +"\n"+" msg no:"+ model.getHl7MsgNo()+"\n"+" message: "+model.getHl7Msg());
//for(HL7001 model:orderList){
String tableMessage = model.getHl7Msg();
// read ADT Message from Table HL7001;
//readADTMsg(tableMessage);
// logging TABLE MESSAGE data into file
StringBuffer transmitMsg = new StringBuffer();
transmitMsg
.append(START_OF_BLOCK)
.append(tableMessage)
.append(END_OF_BLOCK)
.append(CARRAIGE_RETURN);
// write data to port
socket = new Socket(Configuration.getConfig().getServerParams().getUrl(), Configuration.getConfig().getServerParams().getPort());
if(socket.isConnected()){
logger.info(socket.getRemoteSocketAddress()+" port is connected ");
HL7007 hl7007 = new HL7007();
hl7007.setMsgNo(model.getHl7MsgNo());
hl7007.setPortAdress(socket.getRemoteSocketAddress().toString() );
opeonSocketLog(hl7007);
}else{
logger.error("Server socket is not conneted");
}
out = socket.getOutputStream();
//InputStream in = socket.getInputStream();
out.write(transmitMsg.toString().getBytes());
// save file into directory
// logging TABLE MESSAGE data into file
if (params.isOutputOnFile()) {
//comment this line for performance issue
FileLogger.log2(transmitMsg.toString());
}
/** Write across the socket connection and flush the buffer */
out.flush();
out.close();
// insert into record from Table HL7001 to Table HL7003;
insertOrderModel(model);
msgCount++;
logger.info("msgCount "+ msgCount);
if (Configuration.getConfig().getServerParams().getWaitingOption().equals("1")) {
try{
Thread.sleep(1000);
}catch (InterruptedException e) {
logger.error("Wait for writing message into "+ e.getMessage());
}
}
}
}
}catch (Exception e) {
logger.error(e.getMessage());
e.printStackTrace();
}finally{
try {
logger.info("finally block is executed in write method ");
socket.close();
} catch (Exception e) {
logger.error(e.getMessage());
e.printStackTrace();
}
}
}
在上面的写类中，我首先从表中读取记录，然后添加到列表中。如果记录存在，我打开套接字连接，然后将数据写入端口并删除以下记录。但有时候我会得到更多的重复记录
答案 0 :(得分：2)
这一切都发生了两次。你正在打开一个插座给你自己（为什么？）所以另一对读卡器＆amp;编写器是创建的，所以...你不应该通过TCP / IP与自己沟通：此时你的设计存在严重的问题。
答案 1 :(得分：2)
每个条目都不需要套接字。
使用您接受的一个套接字，将所有内容发送到该套接字，并在完成后将其关闭。