Java對象、List集合轉json

@RequestMapping("/editReceiver")
    public void editReceiver(HttpServletRequest request,HttpServletResponse response) {
        int id = Integer.parseInt(request.getParameter("id"));
        //System.out.println(id);
        ReceiverInfo receiverInfo =receiverService.editRInfo(id);
        //生成JSON：　
        Gson gson =new  Gson();
        String json = gson.toJson(receiverInfo);
        response.setCharacterEncoding("UTF-8");  
        response.setContentType("application/json; charset=utf-8");  
        PrintWriter writer = null;
        try {
            writer = response.getWriter();
        } catch (IOException e) {
            e.printStackTrace();
        }
        writer.append(json);
    }

@RequestMapping("/JianSuanList")
    public void jianSuanList(HttpServletRequest request,HttpServletResponse response) {
        HttpSession session =request.getSession();
        @SuppressWarnings("unchecked")//用於取消一些編譯器產生的警告對代碼左側行列的遮擋，有時候這會擋住我們斷點調試時打的斷點
        List<LandCart> laCartsList = (List<LandCart>) session.getAttribute("list");
        Gson gson =new Gson();
        String json = gson.toJson(laCartsList);
        response.setCharacterEncoding("UTF-8");  
        response.setContentType("application/json; charset=utf-8");  
        PrintWriter writer=null;
        try {
            writer=response.getWriter();
        } catch (IOException e) {
            e.printStackTrace();
        }
        writer.append(json);    
    }

需要import com.google.gson.Gson依賴  

 <!-- 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>