httpclient模拟post请求json封装表单数据

谁借莪１个温暖的怀抱￠ 2022-04-15 03:53 279阅读 0赞

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);
        }
    }

原文链接：[https://www.cnblogs.com/Vdiao/p/5339487.html][https_www.cnblogs.com_Vdiao_p_5339487.html]

[https_www.cnblogs.com_Vdiao_p_5339487.html]: https://www.cnblogs.com/Vdiao/p/5339487.html