URLConnection 和HttpServlet 发送核心与核心返回接收请求

public class sendPost{

   

public static String sendGet(String url,String param)
 {
 String result = "" ;
 try {
 String urlName = url + "?" +param; //
 URL U = new URL(urlName);
 URLConnection connection = U.openConnection();
 connection.connect();
 BufferedReader in = new BufferedReader( new InputStreamReader(connection.getInputStream()));
 String line;
 while ((line = in.readLine())!= null )
 {
 result += line;
 }
 in.close();
 } catch (Exception e){
 System.out.println( "Helloword！！" +e);
 }
 return result;
 }
 public static String sendPost(String url,String param)
 {
 String result= "" ;
 try {
 URL httpurl = new URL(url);
 HttpURLConnection httpConn = (HttpURLConnection)httpurl.openConnection();
 httpConn.setDoOutput( true );
 httpConn.setDoInput( true );
 PrintWriter out = new PrintWriter(httpConn.getOutputStream());
 out.print(param);
 out.flush();
 out.close();
 BufferedReader in = new BufferedReader( new InputStreamReader(httpConn.getInputStream()));
 String line;
 while ((line = in.readLine())!= null )
 {
 result += line;
 }
 in.close();
 } catch (Exception e){
 System.out.println( "Helloword！" +e);
 }
 return result;
 }

}

 

package com.zuidaima
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class GetParams extends HttpServlet {
 private static final long serialVersionUID = 1L;
 public GetParams() {
  super ();
 }
 protected void doGet(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  PrintWriter writer = response.getWriter();
  writer.println( "GET " + request.getRequestURL() + " "
    + request.getQueryString());
  Map params = request.getParameterMap();
  String queryString = "" ;
  for (String key : params.keySet()) {
   String[] values = params.get(key);
   for ( int i = 0 ; i < values.length; i++) {
    String value = values[i];
    queryString += key + "=" + value + "&" ;
   }
  }
  // 去掉最后一个空格
  queryString = queryString.substring( 0 , queryString.length() - 1 );
  writer.println( "GET " + request.getRequestURL() + " " + queryString);
 }
 protected void doPost(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  PrintWriter writer = response.getWriter();
  Map params = request.getParameterMap();
  String queryString = "" ;
  for (String key : params.keySet()) {
   String[] values = params.get(key);
   for ( int i = 0 ; i < values.length; i++) {
    String value = values[i];
    queryString += key + "=" + value + "&" ;
   }
  }
  // 去掉最后一个空格
  queryString = queryString.substring( 0 , queryString.length() - 1 );
  writer.println( "POST " + request.getRequestURL() + " " + queryString);
 }
}