统一响应

1　　　　课程应用

1.1　　　　统一响应处理

https://www.cnblogs.com/1446358788-qq/p/14296120.html

 

1.2　　　　统一异常处理

https://www.cnblogs.com/1446358788-qq/p/14296122.html

 

 

2　　　　实际应用

2.1　　　　不同类型判断

        List<StudentDto> list = (o1 instanceof List) ? (List)o1 : Collections.EMPTY_LIST;
        StudentDto dto = (o1 instanceof StudentDto) ? (StudentDto) o1 : new StudentDto();
        String dto = (o1 instanceof String) ? (String) o1 : "";

 

• 测试类：

  package com.ddwei.test;
  
  import com.ddwei.test.dto.StudentDto;
  import com.ddwei.test.service.StudentService;
  import com.ddwei.test.util.CommResult;
  import org.junit.Test;
  
  import java.util.Collections;
  import java.util.List;
  
  public class JavaTest<T> {
  
      StudentService service = new StudentService();
  
      /**
       * 测试返回list情况
       * @author weidoudou
       * @date 2021/8/27 20:39
       * @param
       * @return void
       **/
      @Test
      public void test1(){
          CommResult<T> commResult = service.handl1();
          Object o1 = commonHandlDismantl(commResult);
          List<StudentDto> list = (o1 instanceof List) ? (List)o1 : Collections.EMPTY_LIST;
          list.forEach((e)->System.out.println(e.getStuNo()+" "+e.getStuName()));
      }
  
      /**
       * 测试返回对象情况
       * @author weidoudou
       * @date 2021/8/27 20:40
       * @param
       * @return void
       **/
      @Test
      public void test2(){
          CommResult<T> commResult = service.handl2();
          Object o1 = commonHandlDismantl(commResult);
          StudentDto dto = (o1 instanceof StudentDto) ? (StudentDto) o1 : new StudentDto();
          System.out.println(dto.getStuNo()+" "+dto.getStuName());
      }
  
      /**
       * 测试返回字符串情况
       * @author weidoudou
       * @date 2021/8/27 20:40
       * @param
       * @return void
       **/
      @Test
      public void test3(){
          CommResult<T> commResult = service.handl3();
          Object o1 = commonHandlDismantl(commResult);
          String dto = (o1 instanceof String) ? (String) o1 : "";
          System.out.println(dto);
      }
  
  
  
      public T commonHandlDismantl(CommResult<T> commResult){
          return commResult.getData();
      }
  
  }

   

• service

  package com.ddwei.test.service;
  
  import com.ddwei.test.dto.StudentDto;
  import com.ddwei.test.util.CommResult;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class StudentService<T> {
  
      /**
       * 用来测试封装列表
       * @author weidoudou
       * @date 2021/8/27 20:46
       * @param
       * @return com.ddwei.test.util.CommResult<T>
       **/
      public CommResult<T> handl1(){
          //定义列表相关
          StudentDto studentDto1 = new StudentDto("1001","张三");
          StudentDto studentDto2 = new StudentDto("1002","李四");
          List<StudentDto> list = new ArrayList<StudentDto>();
          list.add(studentDto1);
          list.add(studentDto2);
  
          //定义公共返回类
          CommResult commResult = new CommResult(list);
          return commResult;
      }
  
      /**
       * 用来测试封装实体类
       * @author weidoudou
       * @date 2021/8/27 20:48
       * @param
       * @return com.ddwei.test.util.CommResult<T>
       **/
      public CommResult<T> handl2(){
          StudentDto studentDto = new StudentDto("9001","白骨精");
          CommResult  commResult = new CommResult(studentDto);
          return commResult;
      }
  
      /**
       * 用来测试封装字符串
       * @author weidoudou
       * @date 2021/8/27 20:51
       * @param
       * @return com.ddwei.test.util.CommResult<T>
       **/
      public CommResult<T> handl3(){
          String str = "we Are Friends";
          CommResult commResult = new CommResult(str);
          return commResult;
      }
  
  }

   

• 封装类

  package com.ddwei.test.util;
  
  import lombok.Data;
  
  @Data
  public class CommResult<T> {
      private String code;
      private String message;
      private T data;
  
  
      public CommResult(T data){
          this.code = "0";
          this.message = "";
          this.data = data;
      }
  }

   

• 实体类

  package com.ddwei.test.dto;
  
  import lombok.AllArgsConstructor;
  import lombok.Data;
  import lombok.NoArgsConstructor;
  
  import java.io.Serializable;
  
  @NoArgsConstructor
  @AllArgsConstructor
  @Data
  public class StudentDto implements Serializable {
      private String stuNo;
      private String stuName;
  
  }