SpringBoot restful返回值+统一异常处理+参数校验

restful返回值

自定义错误类型

新建枚举类，写入错误码及错误提示

/**
 * 接口返回错误码，错误提示
 * 参考 https://blog.youkuaiyun.com/alisonyu/article/details/82833413
 */
public enum ResultConsts {
   
    SYSERR(-1,"系统错误"),
    OK(0,"请求成功"),
    ILLGAL_PARAM(40001,"参数无效"),
    ;

    private Integer code;
    private String msg;

    ResultConsts(Integer code, String msg){
   
        this.code = code;
        this.msg = msg;
    }

    public Integer getCode(){
   
        return code;
    }

    public void setCode(Integer code){
   
        this.code = code;
    }

    public String getMsg(){
   
        return msg;
    }

    public void setMsg(String msg){
   
        this.msg = msg;
    }

} 

Restful接口返回值拦截

/**
 * 捕获所有Rest接口返回值
 * springboot-Rest接口返回统一格式数据
 * 参考 https://blog.youkuaiyun.com/alisonyu/article/details/82833413
 */
@ControllerAdvice(annotations = RestController.class)
public class ResultHandler implements ResponseBodyAdvice{
   

    private ThreadLocal<ObjectMapper> mapperThreadLocal = ThreadLocal.withInitial(ObjectMapper::new);

    private static final Class[] annos={
   
            RequestMapping.class,
            GetMapping.class,
            PostMapping.class,
            DeleteMapping.class,
            PutMapping.class
    };

    /**
     * 对所有RestController的接口方法进行拦截
     * @param returnType
     * @param converterType
     * @return
     */
    @Override
    public boolean supports(MethodParameter returnType, Class converterType){
   
        AnnotatedElement element = returnType.getAnnotatedElement();
        return Arrays.stream(annos).anyMatch(anno -> anno.isAnnotation() && element.isAnnotationPresent(anno));
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
   
        Object out;
        ObjectMapper mapper = mapperThreadLocal.get();
        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);