URLConnection 和HttpServlet 发送核心与核心返回接收请求-优快云博客

本文详细探讨了Java中使用URLConnection发起HTTP POST请求以及HttpServlet进行响应接收的核心实现，包括请求参数的设置、连接配置及响应数据的处理。

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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<String, String[]> 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<String, String[]> 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); 
 } 
}