请教高手applet如何用socket和servlet进行通讯？(最好有项细代码)

liucai 2002-12-02 09:31:19

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liucai 2002-12-03

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高手快来呀！！！！

tech_ajun 2002-12-02

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下面是用socket和servlet进行通讯的客户端代码，要注意，JAVA的权限要求，在APPLET中进行socket通讯，servlet和APPLET的WEB服务器必须在一个IP地址上
con = url.openConnection();
//设置连接属性
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false);
//取得输出流
writer = new PrintWriter(con.getOutputStream());

//输出对象
writer.println(argInput);
writer.flush();
writer.close();
//取得输入流
reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String buffer = reader.readLine();

liucai 2002-12-02

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高手们，帮忙啊！

liucai 2002-12-02

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帅哥，我找你说的做了，为什么没有效果？

qljsd 2002-12-02

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需要修改一个文件，路径是： “你的jdk的目录“\jre\lib\security\java.policy。
在文件中加入代码：
permission java.net.SocketPermission "-", "listen";
permission java.net.SocketPermission "-", "accept";
permission java.net.SocketPermission "-", "connect";
permission java.net.SocketPermission "-", "read";
permission java.net.SocketPermission "-", "write";

qljsd 2002-12-02

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你得在客户端加权限！

liucai 2002-12-02

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没人回复，只好自己up

liucai 2002-12-02

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我的程序在运行是出现错误如下，Exception:java.security.AccessControlException: access denied (java.net.SocketPermission 192.168.1.119:80 connect,resolve)，请问这是什么原因？

qljsd 2002-12-02

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Socket s = new Socket(hostIP,hostPort);

liucai 2002-12-02

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我其实关心的是applet怎扬连servlet，是Socket clientSocket =new Socket(ip,port)吗？还是要指定哪一个servlet，如Socket clientSocket =new Socket(servletUrl,port)？

qljsd 2002-12-02

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ServerSocket serverSocket = null;
private DataOutputStream outStream = null;
private DataInputStream inStream = null;
try {
serverSocket = new ServerSocket(port);

socket = serverSocket.accept();

//initialize socket,outStream
inStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
outStream = new DataOutputStream(new BufferedOutputStream(socket.getOutputStream()));

//receive Msg from client
int len = inStream.readInt();
//if(len <= 0) {
//return;
//}
byte[] readBytes=new byte[len];
int i=0,j=len;
//获取返回信息
while(j>0) {
int k=inStream.read(readBytes,i,j);
i=i+k;
j=j-k;
}
String clientMsg = new String(readBytes,0,len,"GB2312");

//send Ack to client
byte[] sendBytes = null;

sendBytes = "<Ack>error</Ack>".getBytes("GB2312");
outStream.writeInt(sendBytes.length);
outStream.write(sendBytes);
outStream.flush();
outStream.close();
socket.close();
}
catch(Exception e) {
if(socket != null) {
socket.close();
}
if(outStream != null) {
outStream.close();
}
if(inStream != null) {
inStream.close();
}
}

liucai 2002-12-02