后端对返回数据的封装

Posted 2022-12-25 yanguobin

idea中新建springboot项目

编写后端返回数据的封装类，如Result.java

public class Result<T> 

    private int code;
    private String msg;
    private T data;

    public static <T> Result<T> success(T data)
        return new Result<T>(data);
    
    
    public static <T> Result<T> error(CodeMsg codeMsg)
        return new  Result<T>(codeMsg);
    
    
    private Result(T data) 
        this.code = 0;
        this.msg = "success";
        this.data = data;
    
    
    private Result(CodeMsg codeMsg) 
        if(codeMsg == null) 
            return;
        
        this.code = codeMsg.getCode();
        this.msg = codeMsg.getMsg();
    

    public int getCode() 
        return code;
    
    public String getMsg() 
        return msg;
    
    public T getData() 
        return data;
    

对状态码和状态信息封装为静态变量的类，如CodeMsg.java

public class CodeMsg 

    private int code;
    private String msg;

    public static CodeMsg SERVER_ERROR = new CodeMsg(500100, "服务端异常");

    private CodeMsg(int code, String msg) 
        this.code = code;
        this.msg = msg;
    
    
    public int getCode() 
        return code;
    

    public String getMsg() 
        return msg;
    

在controller中返回封装好的数据类型

@Controller
@RequestMapping("/demo")
public class DemoController 
    
         @RequestMapping("/hello")
        @ResponseBody
        public Result<String> hello() 
             return Result.success("hello 小老弟");
        
         
         @RequestMapping("/helloError")
        @ResponseBody
        public Result<String> helloError() 
             return Result.error(CodeMsg.SERVER_ERROR);
        
         

结果