j2se中如何在服务器和客户端发送消息
我用J2SE写了一个访问服务器的小程序，服务器端用servlet响应，客户端发消息给服务器端，服务器在收到消息后，将消息传回客户端，问题是服务器端没有收到发的消息
客户端程序：
import java.io.*;
import java.net.*;
public class Transmit_2{
public static void main(String[] args) {
URL url=null;
String xx=("http://localhost:8080/servlet/Receive");
OutputStream out=null;
InputStream in=null;
HttpURLConnection go=null;
String query="stone";
try{
System.out.println("Creating URL");
url=new URL(xx);
System.out.println("Opening Stream");
go=(HttpURLConnection)url.openConnection();
go.setRequestMethod("POST");
go.setDoOutput(true);
out=go.getOutputStream();
DataOutputStream buffer1=new DataOutputStream(out);
if(go.getResponseCode()==200){
System.out.println("OK");
}
System.out.println("Transmiting data");
buffer1.writeChars(query);
buffer1.close();
buffer1=null;
byte[]b=new byte[13];
in=go.getInputStream();
DataInputStream buffer2=new DataInputStream(in);
buffer2.readFully(b);
buffer2.close();
String lik=new String(b);
System.out.println(lik);
}
catch(MalformedURLException e){
System.out.println("Bad URL");
}
catch(IOException e){
System.out.println("IO Error"+e.getMessage());
}
}
}
服务器端程序：
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Receive extends HttpServlet {
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
InputStreamReader buffered=new InputStreamReader(req.getInputStream());
System.out.println("******"+buffered+"********");
BufferedReader nn=new BufferedReader(buffered);
System.out.println("******"+nn+"******");
String lisy=nn.readLine();
System.out.println("******"+nn.readLine()+"********");
res.setContentType("text/html");
PrintWriter out=res.getWriter();
if (lisy!=null)
{
if(lisy.equals("stone")){
out.println(lisy+"good");
}
else
{
out.println(lisy+"Fail");
}
}
else
{
out.println("Nothing,NULL");
}
out.close();
}
public void destroy() {
}
}
每次访问服务器返回的结果都是
Creating URL
Opening Stream
OK
Transmiting data
Nothing,NULL
在服务器端得到输出
******java.io.InputStreamReader@15bdc50********
******java.io.BufferedReader@1dd3812******
******null********
我在服务器端监听端口8080得到的是
报头content.length=0
说明根本就没有把信息发过去
我实在不知道该怎样传送消息，请各位高手帮帮忙，小弟不甚感激！
问题点数：50、回复次数：5Top
1 楼newste（旭林）回复于 2005-06-03 16:46:49 得分 5
用jms可以实现你要的结果
Top
2 楼harbor1981（我向你飞，泪温柔地坠！）回复于 2005-06-03 16:52:55 得分 5
upTop
3 楼ll42002（灰舌）回复于 2005-06-03 17:10:28 得分 5
既然你使用http协议，你就应该生成http包头才可以。Top
4 楼eureka0891（迷茫中...）回复于 2005-06-03 17:45:00 得分 35
你得按http来post数据，
可以用URLConnection:
try {
// Construct data
String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");
// Send data
URL url = new URL("http://hostname:80/cgi");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the response
BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
// Process line...
}
wr.close();
rd.close();
} catch (Exception e) {
}
当然也可以用socket这样的话得写头等:
try {
// Construct data
String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");
// Create a socket to the host
String hostname = "hostname.com";
int port = 80;
InetAddress addr = InetAddress.getByName(hostname);
Socket socket = new Socket(addr, port);
// Send header
String path = "/servlet/SomeServlet";
BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8"));
wr.write("POST "+path+" HTTP/1.0\r\n");
wr.write("Content-Length: "+data.length()+"\r\n");
wr.write("Content-Type: application/x-www-form-urlencoded\r\n");
wr.write("\r\n");
// Send data
wr.write(data);
wr.flush();
// Get response
BufferedReader rd = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
// Process line...
}
wr.close();
rd.close();
} catch (Exception e) {
}
Top
5 楼lishuangying（小双）回复于 2005-06-06 15:30:34 得分 0
多谢各位大哥了，还想问一下eureka0891(迷茫中...) ，可以用HttpURLConnection来建立连接吗？Top
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