[Java语言] Java网络请求工具类

Java网络请求工具类(依赖：org.apache.http;注：HttpClient 4.4,HttpCore 4.4) 
到此处可以去下载依赖包：http://hc.apache.org/downloads.cgi 

1. import java.util.List;
3. import org.apache.http.HttpStatus;
4. import org.apache.http.NameValuePair;
5. import org.apache.http.client.config.RequestConfig;
6. import org.apache.http.client.entity.UrlEncodedFormEntity;
7. import org.apache.http.client.methods.CloseableHttpResponse;
8. import org.apache.http.client.methods.HttpGet;
9. import org.apache.http.client.methods.HttpPost;
10. import org.apache.http.impl.client.CloseableHttpClient;
11. import org.apache.http.impl.client.HttpClients;
12. import org.apache.http.util.EntityUtils;
13. http://www.nvzi91.cn/LEEP/30054.html
14. /**
15. * HttpServletUtil
16. *
17. * @author ysj
18. * @Date: 2015-1-30 下午2:07:55
19. */
20. public class HttpServletUtil {
21. private static CloseableHttpClient httpclient;
22. private static RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(5000).build();
24. /**
25. * Post:访问数据库并返回数据字符串
26. *http://www.nvzi91.cn/kunmingrenliu/041930055.html
27. * @param params
28. * 向服务器端传的参数
29. * @param url
30. * @return String 数据字符串
31. * @throws Exception
32. */
33. public static String doPost(List<NameValuePair> params, String url) throws Exception {
34. String result = null;
35. httpclient = HttpClients.createDefault();
36. HttpPost httpPost = new HttpPost(url);
37. httpPost.setEntity(new UrlEncodedFormEntity(params));
38. //设置请求和传输超时时间
39. httpPost.setConfig(requestConfig);
40. CloseableHttpResponse httpResp = httpclient.execute(httpPost);
41. try {
42. int statusCode = httpResp.getStatusLine().getStatusCode();
43. // 判断是够请求成功
44. if (statusCode == HttpStatus.SC_OK) {
45. System.out.println("状态码:" + statusCode);
46. System.out.println("请求成功!");
47. // 获取返回的数据
48. result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
49. } else {
50. System.out.println("状态码:"
51. + httpResp.getStatusLine().getStatusCode());
52. System.out.println("HttpPost方式请求失败!");
53. }
54. } finally {
55. httpResp.close();
56. httpclient.close();
57. }http://www.nvzi91.cn/shengzhizhengxing/30056.html
58. return result;
59. }
61. /**
62. * Get:访问数据库并返回数据字符串
63. *
64. * @param url
65. * @return String 数据字符串
66. * @throws Exception
67. */
68. public static String doGet(String url) throws Exception{
69. String result = null;
70. httpclient = HttpClients.createDefault();
71. HttpGet httpGet = new HttpGet(url);
72. //设置请求和传输超时时间
73. httpGet.setConfig(requestConfig);
74. CloseableHttpResponse httpResp = httpclient.execute(httpGet);
75. try {
76. int statusCode = httpResp.getStatusLine().getStatusCode();
77. // 判断是够请求成功
78. if (statusCode == HttpStatus.SC_OK) {
79. System.out.println("状态码:" + statusCode);
80. System.out.println("请求成功!");
81. // 获取返回的数据
82. result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
83. } else {http://www.nvzi91.cn/luanchaonanzhong/30057.html
84. System.out.println("状态码:"
85. + httpResp.getStatusLine().getStatusCode());
86. System.out.println("HttpGet方式请求失败!");
87. }http://www.nvzi91.cn/fujianyan/30058.html
88. } finally {
89. httpResp.close();
90. httpclient.close();
91. }www.nvzi91.cn
92. return result;
93. }
94. }