Java 发送Get和Post请求

  1 package com.htpt.superviseServices.dm.util;
  2
  3 import java.io.BufferedReader;
  4 import java.io.IOException;
  5 import java.io.InputStreamReader;
  6 import java.io.PrintWriter;
  7 import java.net.URL;
  8 import java.net.URLConnection;
  9 import java.util.List;
 10 import java.util.Map;
 11
 12 import net.sf.json.JSONArray;
 13
 14 public class HttpRequest {
 15     /**
 16      * 向指定URL发送GET方法的请求
 17      *
 18      * @param url
 19      *            发送请求的URL
 20      * @param param
 21      *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
 22      * @return URL 所代表远程资源的响应结果
 23      */
 24     public static Boolean sendGet(String lon, String lat) {
 25         String result = "";
 26         BufferedReader in = null;
 27         String city = "";
 28         try {
 29             String urlNameString = "http://api.map.baidu.com/geocoder/v2/?ak=56E117E2740978010ece5593e91b00e3&output=json&coordtype=wgs84ll&location="+lat+","+lon;
 30             URL realUrl = new URL(urlNameString);
 31             // 打开和URL之间的连接
 32             URLConnection connection = realUrl.openConnection();
 33             // 设置通用的请求属性
 34             connection.setRequestProperty("accept", "*/*");
 35             connection.setRequestProperty("connection", "Keep-Alive");
 36             connection.setRequestProperty("user-agent",
 37                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
 38             // 建立实际的连接
 39             connection.connect();
 40             // 获取所有响应头字段
 41             Map<String, List<String>> map = connection.getHeaderFields();
 42             // 遍历所有的响应头字段
 43             for (String key : map.keySet()) {
 44                 System.out.println(key + "--->" + map.get(key));
 45             }
 46             // 定义 BufferedReader输入流来读取URL的响应
 47             in = new BufferedReader(new InputStreamReader(
 48                     connection.getInputStream()));
 49             String line;
 50             while ((line = in.readLine()) != null) {
 51                 result += line;
 52             }
 53             JSONArray data = JSONArray.fromObject("["+result+"]");
 54             Map dataMap = (Map) data.get(0);
 55             Map dataResult = (Map)dataMap.get("result");
 56             Map addressComponent = (Map)dataResult.get("addressComponent");
 57             city = (String) addressComponent.get("city");
 58         } catch (Exception e) {
 59             System.out.println("发送GET请求出现异常！" + e);
 60             e.printStackTrace();
 61         }
 62         // 使用finally块来关闭输入流
 63         finally {
 64             try {
 65                 if (in != null) {
 66                     in.close();
 67                 }
 68             } catch (Exception e2) {
 69                 e2.printStackTrace();
 70             }
 71         }
 72         System.out.println(city);
 73         return "长沙市".equals(city);
 74     }
 75
 76     /**
 77      * 向指定 URL 发送POST方法的请求
 78      *
 79      * @param url
 80      *            发送请求的 URL
 81      * @param param
 82      *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
 83      * @return 所代表远程资源的响应结果
 84      */
 85     public static String sendPost(String url, String param) {
 86         PrintWriter out = null;
 87         BufferedReader in = null;
 88         String result = "";
 89         try {
 90             URL realUrl = new URL(url);
 91             // 打开和URL之间的连接
 92             URLConnection conn = realUrl.openConnection();
 93             // 设置通用的请求属性
 94             conn.setRequestProperty("accept", "*/*");
 95             conn.setRequestProperty("connection", "Keep-Alive");
 96             conn.setRequestProperty("user-agent",
 97                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
 98             // 发送POST请求必须设置如下两行
 99             conn.setDoOutput(true);
100             conn.setDoInput(true);
101             // 获取URLConnection对象对应的输出流
102             out = new PrintWriter(conn.getOutputStream());
103             // 发送请求参数
104             out.print(param);
105             // flush输出流的缓冲
106             out.flush();
107             // 定义BufferedReader输入流来读取URL的响应
108             in = new BufferedReader(
109                     new InputStreamReader(conn.getInputStream()));
110             String line;
111             while ((line = in.readLine()) != null) {
112                 result += line;
113             }
114         } catch (Exception e) {
115             System.out.println("发送 POST 请求出现异常！"+e);
116             e.printStackTrace();
117         }
118         //使用finally块来关闭输出流、输入流
119         finally{
120             try{
121                 if(out!=null){
122                     out.close();
123                 }
124                 if(in!=null){
125                     in.close();
126                 }
127             }
128             catch(IOException ex){
129                 ex.printStackTrace();
130             }
131         }
132         return result;
133     }
134 }