向Internet發送請求參數

Code:

1. 利用HttpURLConnection對象,我們可以向網路發送請求參數.  
2. String requestUrl = "http://localhost:8080/itcast/contanctmanage.do";  
3. Map<String, String> requestParams = new HashMap<String, String>();  
4. requestParams.put("age", "12");  
5. requestParams.put("name", "中國");  
6.  StringBuilder params = new StringBuilder();  
7. for(Map.Entry<String, String> entry : requestParams.entrySet()){  
8.     params.append(entry.getKey());  
9.     params.append("=");  
10.     params.append(URLEncoder.encode(entry.getValue(), "UTF-8"));  
11.     params.append("&");  
12. }  
13. if (params.length() > 0) params.deleteCharAt(params.length() - 1);  
14. byte[] data = params.toString().getBytes();  
15. URL realUrl = new URL(requestUrl);  
16. HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();  
17. conn.setDoOutput(true);//發送POST請求必須設定允許輸出  
18. conn.setUseCaches(false);//不使用Cache  
19. conn.setRequestMethod("POST");            
20. conn.setRequestProperty("Connection", "Keep-Alive");//維持長串連  
21. conn.setRequestProperty("Charset", "UTF-8");  
22. conn.setRequestProperty("Content-Length", String.valueOf(data.length));  
23. conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");  
24. DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());  
25. outStream.write(data);  
26. outStream.flush();  
27. if( conn.getResponseCode() == 200 ){  
28.         String result = readAsString(conn.getInputStream(), "UTF-8");  
29.         outStream.close();  
30.         System.out.println(result);  
31. }  

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