工具类: 用于模拟HTTP请求中GET/POST方式

package com.jarvis.base.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
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);
//            System.out.println(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;  
    }
    
    /**
     *Author:Jack
     *Time:2017年9月5日下午2:20:26
     *@param url
     *@param parameters
     *@return
     *Return:String
     *Description:发送Post请求，并且发送的是Json格式的数据。
     */
    public static String sendPostJson(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;  
            String params = "";// 编码之后的参数  
            try {  
                if(parameters!=null && parameters.size()>0){
                    params = FastJsonUtil.toJSONString(parameters);
                }
                // 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);
//                System.out.println(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); 
//    }  
}