用Java模拟Http请求

1），利用httpclient4.× 写一个http的客户端，模拟浏览器请求，

1. publicvoidpost(List<NameValuePair>payload)throwsException{
2. HttpPostpost=newHttpPost(uri);
3. HttpEntityresult=null;
4. try{
5. UrlEncodedFormEntityentity=newUrlEncodedFormEntity(payload,
6. charset);
7. post.setEntity(entity);
8. if(LOG.isDebugEnabled()){
9. LOG.debug("sending:"+payload);
10. }
12. HttpResponseresponse=_httpClient.execute(post);
13. StatusLinestatusLine=response.getStatusLine();
14. if(statusLine.getStatusCode()!=HttpStatus.SC_OK){
15. result=response.getEntity();
16. StringBuildermsg=newStringBuilder();
17. msg.append("httpresponsewithcode"
18. +statusLine.getStatusCode());
19. msg.append("\n");
20. msg.append("postrequest:"+post.getURI());
21. msg.append("\n");
22. msg.append(statusLine.getReasonPhrase());
23. if(result!=null){
24. msg.append("\n\n");
25. msg.append(EntityUtils.toString(result,"UTF-8"));
26. msg.append("\n\n");
27. }
28. thrownewUmcException(msg.toString());
29. }
30. if(response.getEntity()!=null){
31. BufferedReaderreader=newBufferedReader(
32. newInputStreamReader(
33. response.getEntity().getContent(),"UTF-8"));
34. Stringline=null;
35. while((line=reader.readLine())!=null){
36. if(line.indexOf("success")<0)
37. System.out.println(line);
38. }
39. }
40. }finally{
41. if(result!=null)
42. try{
43. EntityUtils.consume(result);
44. }catch(IOExceptione){
45. }
46. post.abort();
47. }
48. }

uri是请求的地址，charset是编码“UTF-8”,List<NameValuePair>就是表单参数集

Java代码

1. ClientConnectionManagerccManager=newThreadSafeClientConnManager();
2. HttpClient_httpClient=newDefaultHttpClient(ccManager);

2) 采用JDK的HttpConnection构造http客户端，

1. ////发送
2. HttpURLConnectionconn=null;
3. try{
4. URLurl=newURL(Your_URL);
5. conn=(HttpURLConnection)url.openConnection();
6. conn.setRequestMethod("POST");
7. conn.setRequestProperty("Content-Type",
8. "application/x-www-form-urlencoded");
9. conn.setUseCaches(false);
10. conn.setDoOutput(true);
11. OutputStreamWriterosw=newOutputStreamWriter(
12. conn.getOutputStream());
13. StringBuffersb=newStringBuffer();
14. addPair(sb,"p1","p1value");
15. addPair(sb,"p2","p2value");
16. osw.write(sb.substring(0,sb.length()-1));
17. osw.flush();
18. BufferedReaderreader=newBufferedReader(
19. newInputStreamReader(conn.getInputStream()));
20. Stringline=null;
21. sb=newStringBuffer();
22. while((line=reader.readLine())!=null){
23. sb.append(line);
24. }
25. line=sb.toString();
26. //处理返回的字符串line
27. return;
28. ////
29. }catch(IOExceptione){
30. //handlee
31. }finally{
32. if(conn!=null)
33. conn.disconnect();
34. }///发送结束

addPair方法：

1. publicstaticvoidaddPair(StringBuffersb,Stringname,Stringvalue){
2. if(value==null){
3. return;
4. }
5. sb.append(name);
6. sb.append("=");
7. sb.append(value);
8. sb.append("&");
9. }