关于java写socket服务和c写的客户端的通信

lanandqiang 2007-04-14 06:22:50

最近由于一个项目的需要，客户端发送一个请求数据，服务端接受以后根据数据做出不同的回。我用java写了一个服务端，请求方为C语言写的,我的服务端程序启动以后，一直处在等待状态没有任何的反映：接受不到请求发来的数据,客户端也接受不到我的回应。而且不报任何异常，问题是，我用JAVA写了一个客户端测试代码却一切正常，麻烦大家谁给指点一二。谢谢，我写的服务器端代码和做测试用的客户端代码如下：
注：C的代码我还没有见（是别人写的）
SERVER：
import java.net.*;
import java.io.*;
class testserver1 implements Runnable
{
Socket s;
public testserver1(Socket s)
{
this.s=s;
}
public void run(){
try{
InputStream ips=s.getInputStream();
OutputStream ops=s.getOutputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(ips));
DataOutputStream dos=new DataOutputStream(ops);
PrintWriter out;
while(true){
System.out.println("已进入循环！！");
String strword=br.readLine();
//br.flush();
System.out.println(strword);
//if(strword.equalsIgnoreCase("quit"))
// break;
//String strecho=(new StringBuffer(strword).reverse()).toString();
//////////////以下代码由于我怀疑是IO的原因，所以我用了各种输出形式结果失败
dos.writeBytes("Init_ok1"+"\n");//回应1
System.out.println("已成功回应了1");
//dos.flush();
ops.write("Init_ok2".getBytes());//回应2
ops.flush();
System.out.println("已回应了2");
out = new PrintWriter(ops,true);
out.println("Init_ok3"+"\n"); //回应3
System.out.println("已回应了3");
out.flush();
out.close();
break;
//destroy();
//stop();
}
br.close();
dos.close();
s.close();
}
catch(NoRouteToHostException ex3) //无法到达远程主机，原因是防火墙干扰或者中间路由器停机。
{
try{
InputStream ips=s.getInputStream();
OutputStream ops=s.getOutputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(ips));
DataOutputStream dos=new DataOutputStream(ops);
dos.writeBytes("Init_Fail");
}
catch(Exception xe){}
ex3.fillInStackTrace();
System.out.println("failed");

}
catch(SocketTimeoutException e2){ //处理超时异常

try{
InputStream ips=s.getInputStream();
OutputStream ops=s.getOutputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(ips));
DataOutputStream dos=new DataOutputStream(ops);
dos.writeBytes("Init_Fail--->out_times");
}
catch(Exception xe){}
e2.fillInStackTrace();
System.out.println("failed");

}
catch(SocketException e1){ //处理底层协议异常
try{
InputStream ips=s.getInputStream();
OutputStream ops=s.getOutputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(ips));
DataOutputStream dos=new DataOutputStream(ops);
dos.writeBytes("Init_Fail-->xieyicuowu");
}
catch(Exception xe){}
e1.fillInStackTrace();
System.out.println("failed");

}
catch(Exception e3){
try{
InputStream ips=s.getInputStream();
OutputStream ops=s.getOutputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(ips));
DataOutputStream dos=new DataOutputStream(ops);
dos.writeBytes("Init_Fail");
}
catch(Exception xe){
xe.fillInStackTrace();}

e3.printStackTrace();
System.out.println("failed");

}
}
}
class testserver2{
public static void main(String arsgs[]){
try{
ServerSocket ss=new ServerSocket(20000);
while(true){
System.out.println("Waiting for conncetion...");
Socket s=ss.accept();
System.out.println("已经接受到请求连接");
new Thread(new testserver1(s)).start();
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
}

client:
import java.io.*;
import java.net.*;

public class testclient1
{
Socket socket;
BufferedReader in;
PrintWriter out;
public testclient1()
{
try
{
System.out.println("Try to Connect to 127.0.0.1:20000");
socket = new Socket("127.0.0.1",20000);
System.out.println("The Server Connected!");
System.out.println("Please enter some Character:");
BufferedReader line = new BufferedReader(new InputStreamReader(System.in));

out = new PrintWriter(socket.getOutputStream(),true);
out.println(line.readLine());
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
System.out.println(in.readLine());
out.close();
in.close();
socket.close();
}catch(IOException e)
{
out.println("Wrong");
}
}
public static void main(String[] args)
{
new testclient1();
}
};

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