[转]HttpClient4基础1--通过匿名代理访问网页

HttpClient发布4.0了 而且底层完全重写了，据说无论是效率还是结构都有质的飞跃。?
现在也要与时具进，研究研究。

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[c-sharp]?view plaincopy

1. package?test.httpclient4.proxy;?????
2. ????
3. import?java.io.BufferedReader;?????
4. import?java.io.IOException;?????
5. import?java.io.InputStreamReader;?????
6. ????
7. import?org.apache.http.HttpEntity;?????
8. import?org.apache.http.HttpHost;?????
9. import?org.apache.http.HttpResponse;?????
10. import?org.apache.http.HttpStatus;?????
11. import?org.apache.http.StatusLine;?????
12. import?org.apache.http.client.ClientProtocolException;?????
13. import?org.apache.http.client.HttpClient;?????
14. import?org.apache.http.client.methods.HttpGet;?????
15. import?org.apache.http.conn.params.ConnRoutePNames;?????
16. import?org.apache.http.impl.client.DefaultHttpClient;?????
17. import?org.apache.http.message.BasicStatusLine;?????
18. import?org.apache.http.util.EntityUtils;?????
19. ????
20. ????
21. public?class?GetHttpByProxy?{?????
22. ????
23. ????public?static?void?main(String[]?args)?throws?ClientProtocolException,?????
24. ????????????IOException?{?????
25. ????????//实例化一个HttpClient?????
26. ????????HttpClient?httpClient?=?new?DefaultHttpClient();?????
27. ????????//设定目标站点?????
28. ????????HttpHost?httpHost?=?new?HttpHost("www.shanhe114.com");?????
29. ????????//设置代理对象?ip/代理名称,端口?????
30. ????????HttpHost?proxy?=?new?HttpHost("192.168.1.28",?5608);?????
31. ????????//对HttpClient对象设置代理?????
32. ????????httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,?????
33. ????????????????proxy);?????
34. ????????HttpGet?httpGet?=?new?HttpGet("/");?????
35. ????????//这里也可以直接使用httpGet的绝对地址，当然如果不是具体地址不要忘记/结尾?????
36. ????????//HttpGet?httpGet?=?new?HttpGet("http://www.shanhe114.com/");?????
37. ????????//HttpResponse?response?=?httpClient.execute(httpGet);?????
38. ?????????????
39. ????????HttpResponse?response?=?httpClient.execute(httpHost,?httpGet);?????
40. ????????if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){?????
41. ????????????//请求成功?????
42. ????????????//取得请求内容?????
43. ????????????HttpEntity?entity?=?response.getEntity();?????
44. ????????????//显示内容?????
45. ????????????if?(entity?!=?null)?{?????
46. ????????????????//?显示结果?????
47. ????????????????BufferedReader?reader?=?new?BufferedReader(new?InputStreamReader(entity?????
48. ????????????????????????.getContent(),?"UTF-8"));?????
49. ????????????????String?line?=?null;?????
50. ????????????????StringBuffer?strBuf?=?new?StringBuffer((int)?entity.getContentLength());?????
51. ????????????????while?((line?=?reader.readLine())?!=?null)?{?????
52. ????????????????????strBuf.append(line);?????
53. ????????????????}?????
54. ????????????????strBuf.trimToSize();?????
55. ????????????????System.out.println(strBuf.toString());?????
56. ????????????}?????
57. ????????????if?(entity?!=?null)?{?????
58. ????????????????entity.consumeContent();?????
59. ????????????}?????
60. ????????}?????
61. ????}?????
62. }????

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对于显示将结果转换成String以备后续使用，HttpClient已经为我们提供了一个简便方法?
如下

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[java]?view plaincopy

1. System.out.println(EntityUtils.toString(entity,"utf-8")); ? ?