java模拟http请求工具类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 用于模拟HTTP请求中GET/POST方式 
 * @author landa
 *
*/
public class HttpUtils {  
/** 
     * 发送GET请求 
     *  
     * @param url 
     *            目的地址 
     * @param parameters 
     *            请求参数，Map类型。 
     * @return 远程响应结果 
*/  
public static String sendGet(String url, Map<String, String> parameters) { 
        String result="";
        BufferedReader in = null;// 读取响应输入流  
        StringBuffer sb = new StringBuffer();// 存储参数  
        String params = "";// 编码之后的参数
try {
// 编码请求参数  
if(parameters.size()==1){
for(String name:parameters.keySet()){
                    sb.append(name).append("=").append(
                            java.net.URLEncoder.encode(parameters.get(name),  
"UTF-8"));
                }
params=sb.toString();
            }else{
for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
"UTF-8")).append("&");  
                }  
                String temp_params = sb.toString();  
params = temp_params.substring(0, temp_params.length() - 1);  
            }
            String full_url = url + "?" + params; 
            System.out.println(full_url); 
// 创建URL对象  
            java.net.URL connURL = new java.net.URL(full_url);  
// 打开URL连接  
            java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL  
                    .openConnection();  
// 设置通用属性  
            httpConn.setRequestProperty("Accept", "*/*");  
            httpConn.setRequestProperty("Connection", "Keep-Alive");  
            httpConn.setRequestProperty("User-Agent",  
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
// 建立实际的连接  
            httpConn.connect();  
// 响应头部获取  
            Map<String, List<String>> headers = httpConn.getHeaderFields();  
// 遍历所有的响应头字段  
for (String key : headers.keySet()) {  
                System.out.println(key + "\t：\t" + headers.get(key));  
            }  
// 定义BufferedReader输入流来读取URL的响应,并设置编码方式  
in = new BufferedReader(new InputStreamReader(httpConn  
                    .getInputStream(), "UTF-8"));  
            String line;  
// 读取返回的内容  
while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
try {  
if (in != null) {  
in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }
return result ;
    }  

/** 
     * 发送POST请求 
     *  
     * @param url 
     *            目的地址 
     * @param parameters 
     *            请求参数，Map类型。 
     * @return 远程响应结果 
*/  
public static String sendPost(String url, Map<String, String> parameters) {  
        String result = "";// 返回的结果  
        BufferedReader in = null;// 读取响应输入流  
        PrintWriter out = null;  
        StringBuffer sb = new StringBuffer();// 处理请求参数  
        String params = "";// 编码之后的参数  
try {  
// 编码请求参数  
if (parameters.size() == 1) {  
for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
"UTF-8"));  
                }  
params = sb.toString();  
            } else {  
for (String name : parameters.keySet()) {  
                    sb.append(name).append("=").append(  
                            java.net.URLEncoder.encode(parameters.get(name),  
"UTF-8")).append("&");  
                }  
                String temp_params = sb.toString();  
params = temp_params.substring(0, temp_params.length() - 1);  
            }  
// 创建URL对象  
            java.net.URL connURL = new java.net.URL(url);  
// 打开URL连接  
            java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL  
                    .openConnection();  
// 设置通用属性  
            httpConn.setRequestProperty("Accept", "*/*");  
            httpConn.setRequestProperty("Connection", "Keep-Alive");  
            httpConn.setRequestProperty("User-Agent",  
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");  
// 设置POST方式  
            httpConn.setDoInput(true);  
            httpConn.setDoOutput(true);  
// 获取HttpURLConnection对象对应的输出流  
out = new PrintWriter(httpConn.getOutputStream());  
// 发送请求参数  
out.write(params);  
// flush输出流的缓冲  
out.flush();  
// 定义BufferedReader输入流来读取URL的响应，设置编码方式  
in = new BufferedReader(new InputStreamReader(httpConn  
                    .getInputStream(), "UTF-8"));  
            String line;  
// 读取返回的内容  
while ((line = in.readLine()) != null) {  
                result += line;  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
try {  
if (out != null) {  
out.close();  
                }  
if (in != null) {  
in.close();  
                }  
            } catch (IOException ex) {  
                ex.printStackTrace();  
            }  
        }  
return result;  
    }  

/** 
     * 主函数，测试请求 
     *  
     * @param args 
*/  
public static void main(String[] args) {  
        Map<String, String> parameters = new HashMap<String, String>();  
        parameters.put("name", "sarin");  
        String result =sendGet("http://www.baidu.com", parameters);
        System.out.println(result); 
    }  
}  

本文转自：http://www.cnblogs.com/vitre/p/5474166.html