废话不说上代码：
public static String httpPostWithJSON(String url) throws Exception { HttpPost httpPost = new HttpPost(url); CloseableHttpClient client = HttpClients.createDefault(); String respContent = null; // json方式 JSONObject jsonParam = new JSONObject(); jsonParam.put("name", "admin"); jsonParam.put("pass", "123456"); StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");//解决中文乱码问题 entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); System.out.println(); // 表单方式// List<BasicNameValuePair> pairList = new ArrayList<BasicNameValuePair>(); // pairList.add(new BasicNameValuePair("name", "admin"));// pairList.add(new BasicNameValuePair("pass", "123456"));// httpPost.setEntity(new UrlEncodedFormEntity(pairList, "utf-8")); HttpResponse resp = client.execute(httpPost); if(resp.getStatusLine().getStatusCode() == 200) { HttpEntity he = resp.getEntity(); respContent = EntityUtils.toString(he,"UTF-8"); } return respContent; } public static void main(String[] args) throws Exception { String result = httpPostWithJSON("http://localhost:8080/hcTest2/Hc"); System.out.println(result); }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。
public class HcServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); String acceptjson = ""; User user = new User(); BufferedReader br = new BufferedReader(new InputStreamReader( (ServletInputStream) request.getInputStream(), "utf-8")); StringBuffer sb = new StringBuffer(""); String temp; while ((temp = br.readLine()) != null) { sb.append(temp); } br.close(); acceptjson = sb.toString(); if (acceptjson != "") { JSONObject jo = JSONObject.parseObject(acceptjson); user.setUsername(jo.getString("name")); user.setPassword(jo.getString("pass")); } request.setAttribute("user", user); request.getRequestDispatcher("/message.jsp").forward(request, response); }}代码比较简陋，只是用于测试。希望能够有所收获。
以上就是小编为大家带来的httpclient模拟post请求json封装表单数据的实现方法全部内容了，希望大家多多支持武林网~