Java对象、List集合转json

 1 @RequestMapping("/editReceiver")
 2     public void editReceiver(HttpServletRequest request,HttpServletResponse response) {
 3         int id = Integer.parseInt(request.getParameter("id"));
 4         //System.out.println(id);
 5         ReceiverInfo receiverInfo =receiverService.editRInfo(id);
 6         //生成JSON：　
 7         Gson gson =new  Gson();
 8         String json = gson.toJson(receiverInfo);
 9         response.setCharacterEncoding("UTF-8");  
10         response.setContentType("application/json; charset=utf-8");  
11         PrintWriter writer = null;
12         try {
13             writer = response.getWriter();
14         } catch (IOException e) {
15             e.printStackTrace();
16         }
17         writer.append(json);
18     }

 1 @RequestMapping("/JianSuanList")
 2     public void jianSuanList(HttpServletRequest request,HttpServletResponse response) {
 3         HttpSession session =request.getSession();
 4         @SuppressWarnings("unchecked")//用于取消一些编译器产生的警告对代码左侧行列的遮挡，有时候这会挡住我们断点调试时打的断点
 5         List<LandCart> laCartsList = (List<LandCart>) session.getAttribute("list");
 6         Gson gson =new Gson();
 7         String json = gson.toJson(laCartsList);
 8         response.setCharacterEncoding("UTF-8");  
 9         response.setContentType("application/json; charset=utf-8");  
10         PrintWriter writer=null;
11         try {
12             writer=response.getWriter();
13         } catch (IOException e) {
14             e.printStackTrace();
15         }
16         writer.append(json);    
17     }

需要import com.google.gson.Gson依赖  

 <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
  <dependency>
     <groupId>com.google.code.gson</groupId>
     <artifactId>gson</artifactId>
     <version>2.8.2</version>
 </dependency>