1 packagecom.demo.util;2

3 importjava.io.BufferedReader;4 importjava.io.IOException;5 importjava.io.InputStreamReader;6 importjava.io.OutputStreamWriter;7 importjava.net.URL;8 importjava.net.URLConnection;9

10 public classHttpUtil {11 /**

12 * 向指定URL发送GET方法的请求13 *14 *@paramurl 发送请求的URL15 *@paramparam 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。16 *@returnresult 所代表远程资源的响应结果17 */

18 public staticString sendGet(String url, String param) {19 String result = "";20 BufferedReader in = null;21 try{22 String urlNameString = url + "?" +param;23 URL realUrl = newURL(urlNameString);24 //打开和URL之间的连接

25 URLConnection connection =realUrl.openConnection();26 //设置通用的请求属性

27 connection.setRequestProperty("accept", "*/*");28 connection.setRequestProperty("connection", "Keep-Alive");29 connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");30 //建立实际的连接

31 connection.connect();32 /*//获取所有响应头字段33 Map> map = connection.getHeaderFields();34 //遍历所有的响应头字段35 for (String key : map.keySet()) {36 System.out.println(key + "--->" + map.get(key));37 }*/

38 //定义 BufferedReader输入流来读取URL的响应

39 in = new BufferedReader(newInputStreamReader(connection.getInputStream()));40 String line;41 while ((line = in.readLine()) != null) {42 result +=line;43 }44 } catch(Exception e) {45 System.out.println("发送GET请求出现异常！" +e);46 e.printStackTrace();47 }48 //使用finally块来关闭输入流

49 finally{50 try{51 if (in != null) {52 in.close();53 }54 } catch(Exception e2) {55 e2.printStackTrace();56 }57 }58 returnresult;59 }60

61

62 /**

63 * 向指定URL发送POST方法的请求64 *65 *@paramurl 发送请求的 URL66 *@paramparam 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。67 *@returnresult 所代表远程资源的响应结果68 */

69 public staticString sendPost(String url, String param) {70 OutputStreamWriter out = null;71 BufferedReader in = null;72 String result = "";73 try{74 URL realUrl = newURL(url);75 //打开和URL之间的连接

76 URLConnection conn =realUrl.openConnection();77 //设置通用的请求属性

78 conn.setRequestProperty("accept", "*/*");79 conn.setRequestProperty("connection", "Keep-Alive");80 conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");81 conn.setRequestProperty("Charset", "utf-8");82 //发送POST请求必须设置如下两行

83 conn.setDoOutput(true);84 conn.setDoInput(true);85 //获取URLConnection对象对应的输出流

86 out = new OutputStreamWriter(conn.getOutputStream(), "utf-8");//这里设定需要字符集，防止项目环境编码与URL地址环境的编码(UTF-8)不一样，造成响应结果乱码87 //发送请求参数

88 out.write(param);89 //flush输出流的缓冲

90 out.flush();91 //定义BufferedReader输入流来读取URL的响应

92 in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));93 String line;94 while ((line = in.readLine()) != null) {95 result +=line;96 }97 } catch(Exception e) {98 System.out.println("发送 POST 请求出现异常！"+e);99 e.printStackTrace();100 }101 //使用finally块来关闭输出流、输入流

102 finally{103 try{104 if(out!=null){105 out.close();106 }107 if(in!=null){108 in.close();109 }110 }111 catch(IOException ex){112 ex.printStackTrace();113 }114 }115 returnresult;116 }117

118 }