废话不说上代码：
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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);
}
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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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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);
}
}
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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，希望大家多多支持服务器之家~