httpclient模拟post请求json封装表单数据

源：http://www.cnblogs.com/Vdiao/p/5339487.html
评：
好长时间不更博了，主要肚子里没什么好墨水，哈哈。废话不说上代码。

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1 public static String httpPostWithJSON(String url) throws Exception {
2
3 HttpPost httpPost = new HttpPost(url);
4 CloseableHttpClient client = HttpClients.createDefault();
5 String respContent = null;
6
7 // json方式
8 JSONObject jsonParam = new JSONObject();
9 jsonParam.put("name", "admin");
10 jsonParam.put("pass", "123456");
11 StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");//解决中文乱码问题
12 entity.setContentEncoding("UTF-8");
13 entity.setContentType("application/json");
14 httpPost.setEntity(entity);
15 System.out.println();
16
17
18 // 表单方式
19 // List pairList = new ArrayList();
20 // pairList.add(new BasicNameValuePair("name", "admin"));
21 // pairList.add(new BasicNameValuePair("pass", "123456"));
22 // httpPost.setEntity(new UrlEncodedFormEntity(pairList, "utf-8"));
23
24
25 HttpResponse resp = client.execute(httpPost);
26 if(resp.getStatusLine().getStatusCode() == 200) {
27 HttpEntity he = resp.getEntity();
28 respContent = EntityUtils.toString(he,"UTF-8");
29 }
30 return respContent;
31 }
32
33
34 public static void main(String[] args) throws Exception {
35 String result = httpPostWithJSON("http://localhost:8080/hcTest2/Hc");
36 System.out.println(result);
37 }
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post方式 就要考虑提交的表单内容怎么传输了。本文name和pass就是表单的值了。

封装表单属性可以用json也可以用传统的表单，如果是传统表单的话 要注意，也就是在上边代码注释那部分。用这种方式的话在servlet里也就是数据处理层可以通过request.getParameter(”string“)直接获取到属性值。就是相比json这种要简单一点，不过在实际开发中一般都是用json做数据传输的。用json的话有两种选择一个是阿里巴巴的fastjson还有一个就是谷歌的gson。fastjson相比效率比较高，gson适合解析有规律的json数据。博主这里用的是fastjson。还有用json的话在数据处理层要用流来读取表单属性，这就是相比传统表单多的一点内容。代码下边已经有了。



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1 public class HcServlet extends HttpServlet {
2 private static final long serialVersionUID = 1L;
3
4 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
5 doPost(request, response);
6 }
7
8
9 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
10
11 request.setCharacterEncoding("UTF-8");
12 response.setContentType("text/html;charset=UTF-8");
13 String acceptjson = "";
14 User user = new User();
15 BufferedReader br = new BufferedReader(new InputStreamReader(
16 (ServletInputStream) request.getInputStream(), "utf-8"));
17 StringBuffer sb = new StringBuffer("");
18 String temp;
19 while ((temp = br.readLine()) != null) {
20 sb.append(temp);
21 }
22 br.close();
23 acceptjson = sb.toString();
24 if (acceptjson != "") {
25 JSONObject jo = JSONObject.parseObject(acceptjson);
26 user.setUsername(jo.getString("name"));
27 user.setPassword(jo.getString("pass"));
28 }
29
30 request.setAttribute("user", user);
31 request.getRequestDispatcher("/message.jsp").forward(request, response);
32 }
33 }
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代码比较简陋，只是用于测试。希望能够有所收获。