Servlet-Vue-JSON交互

统一结果返回

• 定义

  package org.example.result;
  
  import lombok.AllArgsConstructor;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  
  @Data
  @NoArgsConstructor
  @AllArgsConstructor
  public class Result<T> {
      private Integer code;
      private String message;
      private T data;
  
      public static Result success(String message, Object data) {
          Result result = new Result<>();
          result.setCode(200);
          result.setMessage(message);
          result.setData(data);
          return result;
      }
  
      public static Result success(Integer code, String message, Object data) {
          Result result = new Result<>();
          result.setCode(code);
          result.setMessage(message);
          result.setData(data);
          return result;
      }
  
      public static Result error(String message) {
          Result result = new Result<>();
          result.setCode(500);
          result.setMessage(message);
          result.setData(null);
          return result;
      }
  }
  
  

创建控制器

• controller

  package org.example.controller.user;
  
  import com.google.gson.Gson;
  
  @WebServlet("/user/login")
  public class UserLonginController extends HttpServlet {
      private UserService userService = new UserServiceImpl();
  
      @Override
      protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          String username = req.getParameter("username");
          String password = req.getParameter("password");
          Gson gson = new Gson();
          User user = userService.getUserByUserName(username, password);
          if (user != null) {
              // 密码脱敏处理
              user.setPassword("********");
              Result result = Result.success("登录成功", user);
              resp.getWriter().println(gson.toJson(result));
          } else {
              Result result = Result.error("登录失败");
              // 输出 json 格式的字符串
              resp.getWriter().println(gson.toJson(result));
          }
      }
  }
  
  

Axios

• 发送请求

  axios({
  	baseURL: "http://localhost:8080",
      url: "/user/login",
      method: "get",
      params:{
          // es6 语法
          username,
          password
      }
  })
  

• 测试
  

POST

• post请求

  • controller

    package org.example.controller.user;
    
    import com.google.gson.Gson;
    import com.google.gson.JsonObject;
    
    @WebServlet("/user/update")
    public class UserUpdateController extends HttpServlet {
        private UserService userService = new UserServiceImpl();
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            BufferedReader reader = req.getReader();
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            // 使用 Gson 解析 JSON 数据
            Gson gson = new Gson();
            JsonObject json = gson.fromJson(sb.toString(), JsonObject.class);
            // 获取 JSON 中的参数
            Integer userId = Integer.valueOf(json.get("id").getAsString());
            String userName = json.get("username").getAsString();
            String phone = json.get("phone").getAsString();
            String address = json.get("address").getAsString();
            String nickname = json.get("nickname").getAsString();
            String email = json.get("username").getAsString();
            // 传递到对象中
            User user = new User();
            user.setId(userId);
            user.setUsername(userName);
            user.setPhone(phone);
            user.setAddress(address);
            user.setNickname(nickname);
            user.setEmail(email);
            boolean isUpdate = userService.updateById(user);
            if (isUpdate) {
                // 更新成功
                Result result = Result.success("数据更新成功!", null);
                resp.getWriter().println(gson.toJson(result));
            } else {
                Result result = Result.error("数据更新失败!");
                resp.getWriter().println(gson.toJson(result));
            }
        }
    }
    
    

  • axios

    axios({
    	baseURL: "http://localhost:8080",
        url: "/user/update",
        method: "post",
        data:{
            // es6 语法
            userId,
            userName,
            phone,
            address,
            email
        }
    })