Http 请求的工具类：
1、异步的 Get 请求；
2、异步的 Post 请求；
3、Get 请求，获得返回数据；
4、向指定 URL 发送 POST方法的请求。
1 import java.io.BufferedReader;
2 import java.io.ByteArrayOutputStream;
3 import java.io.IOException;
4 import java.io.InputStream;
5 import java.io.InputStreamReader;
6 import java.io.PrintWriter;
7 import java.net.HttpURLConnection;
8 import java.net.URL;
9
10 // Http 请求的工具类
11 public class HttpUtils
12 {
13
14 private static final int TIMEOUT_IN_MILLIONS = 5000;
15
16 public interface CallBack
17 {
18 void onRequestComplete(String result);
19 }
20
21
22 /**
23 * 异步的 Get 请求
24 *
25 * @param urlStr
26 * @param callBack
27 */
28 public static void doGetAsyn(final String urlStr, final CallBack callBack)
29 {
30 new Thread()
31 {
32 public void run()
33 {
34 try
35 {
36 String result = doGet(urlStr);
37 if (callBack != null)
38 {
39 callBack.onRequestComplete(result);
40 }
41 } catch (Exception e)
42 {
43 e.printStackTrace();
44 }
45
46 };
47 }.start();
48 }
49
50 /**
51 * 异步的 Post 请求
52 * @param urlStr
53 * @param params
54 * @param callBack
55 * @throws Exception
56 */
57 public static void doPostAsyn(final String urlStr, final String params,
58 final CallBack callBack) throws Exception
59 {
60 new Thread()
61 {
62 public void run()
63 {
64 try
65 {
66 String result = doPost(urlStr, params);
67 if (callBack != null)
68 {
69 callBack.onRequestComplete(result);
70 }
71 } catch (Exception e)
72 {
73 e.printStackTrace();
74 }
75
76 };
77 }.start();
78
79 }
80
81 /**
82 * Get 请求，获得返回数据
83 *
84 * @param urlStr
85 * @return
86 * @throws Exception
87 */
88 public static String doGet(String urlStr)
89 {
90 URL url = null;
91 HttpURLConnection conn = null;
92 InputStream is = null;
93 ByteArrayOutputStream baos = null;
94 try
95 {
96 url = new URL(urlStr);
97 conn = (HttpURLConnection) url.openConnection();
98 conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
99 conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
100 conn.setRequestMethod("GET");
101 conn.setRequestProperty("accept", "*/*");
102 conn.setRequestProperty("connection", "Keep-Alive");
103 if (conn.getResponseCode() == 200)
104 {
105 is = conn.getInputStream();
106 baos = new ByteArrayOutputStream();
107 int len = -1;
108 byte[] buf = new byte[128];
109
110 while ((len = is.read(buf)) != -1)
111 {
112 baos.write(buf, 0, len);
113 }
114 baos.flush();
115 return baos.toString();
116 } else
117 {
118 throw new RuntimeException(" responseCode is not 200 ... ");
119 }
120
121 } catch (Exception e)
122 {
123 e.printStackTrace();
124 } finally
125 {
126 try
127 {
128 if (is != null)
129 is.close();
130 } catch (IOException e)
131 {
132 }
133 try
134 {
135 if (baos != null)
136 baos.close();
137 } catch (IOException e)
138 {
139 }
140 conn.disconnect();
141 }
142
143 return null ;
144
145 }
146
147 /**
148 * 向指定 URL 发送 POST 方法的请求
149 *
150 * @param url
151 * 发送请求的 URL
152 * @param param
153 * 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
154 * @return 所代表远程资源的响应结果
155 * @throws Exception
156 */
157 public static String doPost(String url, String param)
158 {
159 PrintWriter out = null;
160 BufferedReader in = null;
161 String result = "";
162 try
163 {
164 URL realUrl = new URL(url);
165 // 打开和URL之间的连接
166 HttpURLConnection conn = (HttpURLConnection) realUrl
167 .openConnection();
168 // 设置通用的请求属性
169 conn.setRequestProperty("accept", "*/*");
170 conn.setRequestProperty("connection", "Keep-Alive");
171 conn.setRequestMethod("POST");
172 conn.setRequestProperty("Content-Type",
173 "application/x-www-form-urlencoded");
174 conn.setRequestProperty("charset", "utf-8");
175 conn.setUseCaches(false);
176 // 发送POST请求必须设置如下两行
177 conn.setDoOutput(true);
178 conn.setDoInput(true);
179 conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
180 conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
181
182 if (param != null && !param.trim().equals(""))
183 {
184 // 获取URLConnection对象对应的输出流
185 out = new PrintWriter(conn.getOutputStream());
186 // 发送请求参数
187 out.print(param);
188 // flush输出流的缓冲
189 out.flush();
190 }
191 // 定义BufferedReader输入流来读取URL的响应
192 in = new BufferedReader(
193 new InputStreamReader(conn.getInputStream()));
194 String line;
195 while ((line = in.readLine()) != null)
196 {
197 result += line;
198 }
199 } catch (Exception e)
200 {
201 e.printStackTrace();
202 }
203 // 使用finally块来关闭输出流、输入流
204 finally
205 {
206 try
207 {
208 if (out != null)
209 {
210 out.close();
211 }
212 if (in != null)
213 {
214 in.close();
215 }
216 } catch (IOException ex)
217 {
218 ex.printStackTrace();
219 }
220 }
221 return result;
222 }
223 }
时间： 2024-10-13 05:37:09