统一异常处理

    @PostMapping(value = "/grils")
    public Result<Gril> grilAdd(@Valid Gril gril,BindingResult bindingResult){
        
        System.out.println("love:"+gril.getLove());
        
        if (bindingResult.hasErrors()) {            
            return ResultUtil.error(1, bindingResult.getFieldError().getDefaultMessage());
        }
        /*直接得到传入参数*/
        gril.setCupSize(gril.getCupSize());
        gril.setAge(gril.getAge());

        System.out.println("gril.getCupSize():"+gril.getCupSize());
        System.out.println("gril.getAge():"+gril.getAge());
        
        return ResultUtil.success(grilRepository.save(gril));
    }

    public void getAge(Integer id) throws Exception{
        Gril gril = grilRepository.findOne(id);
        Integer age = gril.getAge();
        if (age < 10) {
            //返回“你还在上小学吧” code=100
            throw new GrilException(ResultEnum.PRIMARY_SCHOOL);
        }else if(age > 10 && age < 16){
            //返回“你可能在上初中” code=101
            throw new GrilException(ResultEnum.MIDDLE_SCHOOL);
        }
        
        //如果>16岁,加钱
        //...
        
    }

package com.imooc.exception;

import com.imooc.enums.ResultEnum;

public class GrilException extends RuntimeException{

    private Integer code;

    public GrilException(ResultEnum resultEnum) {
        super(resultEnum.getMsg());
        this.code = resultEnum.getCode();
    }

    public Integer getCode() {
        return code;
    }

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

public enum ResultEnum {

    UNKONW_ERROR(-1,"未知错误"),
    SUCCESS(0,"成功"),
    PRIMARY_SCHOOL(100,"你可能还在上小学"),
    MIDDLE_SCHOOL(101,"你可能再上初中"),
    ;
    private Integer code;
    
    private String msg;

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

    public Integer getCode() {
        return code;
    }

    public String getMsg() {
        return msg;
    }
    
    
}

package com.imooc.handle;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import com.imooc.constant.GrilConstant;
import com.imooc.domain.Result;
import com.imooc.exception.GrilException;
import com.imooc.utils.ResultUtil;

/**
 * @author by
 *
 */
@ControllerAdvice
public class ExceptionHandle {

    @ExceptionHandler(value = Exception.class)
    @ResponseBody
    public Result handle(Exception e){
        //instanceof用来判断内存中实际对象A是不是B类型
        if (e instanceof GrilException) {
            //必须经过这一行代码，grilException对象才能调用GrilException里的方法
            GrilException grilException = (GrilException) e;
            return ResultUtil.error(grilException.getCode(), grilException.getMessage());
        }else{    
            return ResultUtil.error(GrilConstant.code,GrilConstant.grilException);
        }
    }
}

package com.imooc.utils;

import java.util.List;


import com.imooc.domain.Result;

/**
 * @author by
 *
 */
public class ResultUtil {
    
    public static Result success(Object object){
        Result result = new Result();
        result.setCode(0);
        result.setMsg("成功");
        result.setData(object);
        return result;
    }
        
    public static Result success(){
        return success(null);
    }
    
    public static Result error(Integer code,String msg){
        Result result = new Result();
        result.setCode(code);
        result.setMsg(msg);
        result.setData(null);
        return result;
    }
}

package com.imooc.domain;

/**http请求返回的最外层对象
 * @author by
 *
 */
public class Result<T> {
    
    /*错误码*/
    private Integer code;
    
    /*提示信息*/
    private String msg;
    
    /*具体的内容*/
    private T data;

    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;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
    
    

}

package com.imooc.constant;

public class GrilConstant {
    
    public static String grilException = "未知错误";
    
    public static Integer code = -1;

}