开发学院软件开发Java 用户发送要求和接收服务器响应 阅读

用户发送要求和接收服务器响应

 2007-12-23 12:29:19 来源:WEB开发网   
核心提示:import javax.microedition.midlet.*;import javax.microedition.io.*;import java.io.*;public class ViewFile extends MIDlet{PRivate String url = "http://www.co
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;

public class ViewFile extends MIDlet
{
 PRivate String url = "http://www.corej2me.com/midpbook_v1e1/ch14/getHeaderInfo.txt";

 public void startApp()
 {
  try
  {
   processRequest();
  }
  catch (Exception e)
  {
   System.err.println("Msg: " + e.toString());
  }
 }  

 private void processRequest() throws IOException
 {
  HttpConnection http = null;
  InputStream iStrm = null;
  
  try
  {
   // Create the connection
   http = (HttpConnection) Connector.open(url);
   
   //----------------
   // Client Request
   //----------------
   // 1) Send request method
   http.setRequestMethod(HttpConnection.GET);
   
   // 2) Send header information (this header is optional)
   http.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0");
//   http.setRequestProperty("If-Modified-Since", "Mon, 16 Jul 2001 22:54:26 GMT");

   // If you eXPerience IO problems, try 
   // removing the comment from the following line
   //http.setRequestProperty("Connection", "close");   
   
   // 3) Send body/data - No data for this request
   

   //----------------
   // Server Response
   //----------------
   System.out.println("url: " + url);
   System.out.println("-------------------------");   
   
   // 1) Get status Line
   System.out.println("Msg: " + http.getResponseMessage());         
   System.out.println("Code: " + http.getResponseCode());        
   
   // 2) Get header information 
   if (http.getResponseCode() == HttpConnection.HTTP_OK)
   {
    System.out.println("field 0: " + http.getHeaderField(0));    
    System.out.println("field 1: " + http.getHeaderField(1));
    System.out.println("field 2: " + http.getHeaderField(2));    
    System.out.println("-------------------------");
        
    System.out.println("key 0: " + http.getHeaderFieldKey(0));    
    System.out.println("key 1 : " + http.getHeaderFieldKey(1));    
    System.out.println("key 2: " + http.getHeaderFieldKey(2));        
    System.out.println("-------------------------");
                  
    System.out.println("content: " + http.getHeaderField("content-type"));
    System.out.println("date: " + http.getHeaderField("date"));
    System.out.println("last-modified: " + http.getHeaderField("last-modified"));        
    
    System.out.println("-------------------------");

    // 3) Get data (show the file contents)
    String str;
    iStrm = http.openInputStream();
    int length = (int) http.getLength();
    if (length != -1)
    {
     // Read data in one chunk
     byte serverData[] = new byte[length];
     iStrm.read(serverData);
     str = new String(serverData);
    }
    else // Length not available...
    {
     ByteArrayOutputStream bStrm = new ByteArrayOutputStream();    
     
     // Read data one character at a time
     int ch;
     while ((ch = iStrm.read()) != -1)
      bStrm.write(ch);
 
     str = new String(bStrm.toByteArray());
     bStrm.close();        
    }
    
    System.out.println("File Contents: " + str);
    
    //-----------------------------
    // Show connection information
    //-----------------------------
    System.out.println("Host: " + http.getHost());
    System.out.println("Port: " + http.getPort());
    System.out.println("Type: " + http.getType());        
    
//    System.out.println("File: " + http.getFile());            
//    System.out.println("Protocol: " + http.getProtocol());            
//    System.out.println("URL: " + http.getURL());                    
//    System.out.println("Query: " + http.getQuery());                
   }
  }catch(Exception e){
    e.printStackTrace();
  
  }finally{
   // Clean up
   if (iStrm != null)
    iStrm.close();
   if (http != null)
    http.close();
  }
 }

 public void pauseApp(){}

 public void destroyApp(boolean unconditional){ }
}

(出处:http://www.cncms.com)


Tags:用户 发送 要求

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