Java模拟http请求远程调用接口工具类

package ln;

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); } }