SpringBoot框架 -- 自定义异常封装实现

分手后的思念是犯贱 2023-06-08 04:45 8阅读 0赞

## SpringBoot框架 – 异常封装初始化 ##

本章基于[SpringBoot框架 – 逻辑简单实现][SpringBoot_ _]

--------------------

#### 第一步：结构-创建文件和类 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70]

#### 第二步:书写异常封装实现 ####

**公用异常接口**

代码

package com.springboot.demo.common.error;
    
    
    public interface CommonError { 
    
        public int getCode();
    
        public String getErrMsg();
    
        public CommonError setErrMsg(String errMsg);
    }

图示  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 1]

**实现公用异常接口**

代码

package com.springboot.demo.common.error;
    
    
    public enum EmBusinessError implements CommonError { 
    
        // 全局错误码
        // 10000 开头为用户信息相关错误定义
    
        USER_NOT_EXIST(10001,"用户不存在"),
    
    
        //通用错误码
        PARAMATER_VALIDATION_ERROR(90001,"参数错误"),
    
        ;
    
        private int errCode;
        private String errMsg;
    
        private EmBusinessError(int errCode, String errMsg) { 
            this.errCode=errCode;
            this.errMsg=errMsg;
    
        }
    
        @Override
        public int getCode() { 
            return this.errCode;
        }
    
        @Override
        public String getErrMsg() { 
            return this.errMsg;
        }
    
        @Override
        public CommonError setErrMsg(String errMsg) { 
            this.errMsg = errMsg;
    
            return this;
        }
    }

图示

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 2]

**继承 异常类构建异常自定义封装**

代码

package com.springboot.demo.common.error;
    
    /** * 〈一句话功能简述〉<br> * 〈功能详细描述〉 * * @author 88450572 * @date 2019/10/16 11:15 * @see [相关类/方法]（可选） * @since [产品/模块版本] （可选） */
    public class BusinessError extends Exception implements CommonError{ 
    
        private CommonError commonError;
    
    
        //直接接收EmbusinessError的传参用于构造函数异常
        public BusinessError(CommonError commonError){ 
            super();
            this.commonError = commonError;
    
    
        }
    
     //接收自定义 errmsg的方式构造业务异常
        public BusinessError(CommonError commonError,String erMsg){ 
            super();
            this.commonError=commonError;
            this.commonError.setErrMsg(erMsg);
        }
    
    
        @Override
        public int getCode() { 
            return this.commonError.getCode();
        }
    
        @Override
        public String getErrMsg() { 
            return this.commonError.getErrMsg();
        }
    
        @Override
        public CommonError setErrMsg(String errMsg) { 
             this.commonError.setErrMsg(errMsg);
             return this;
        }
    }

图示

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 3]

--------------------

#### 第三步 ：定义异常处理器。拦截所有异常请求 ####

代码

package com.springboot.demo.controller;
    
    import com.springboot.demo.common.response.CommonReturnType;
    import org.springframework.http.HttpStatus;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.ResponseStatus;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    
    public class BaseController { 
        // 定义异常类
        @ExceptionHandler(Exception.class)
        // 获取异常返回200
        @ResponseStatus(HttpStatus.OK)
        @ResponseBody//返回json
        public Object handleException(HttpServletRequest request, Exception ex) { 
            // 模块抛出异常，被注解exceptionHandle拦截到进入此类，状态设置200 返回null；
            CommonReturnType commonReturnType = new CommonReturnType();
            commonReturnType.setStatus("fail");
            commonReturnType.setData(ex);
    
            return commonReturnType ;
    
        }
    
    
    }

图示  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 4]

--------------------

**自定义异常校验或者debuger测试**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 6]  
*如果拦截返回json数据*

**启动容器校验**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 7]

--------------------

## 备注：异常处理器正常运行，使用自定义异常封装类融合 ##

#### 第四步：测试异常 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 8]

package com.springboot.demo.controller;
    
    import com.springboot.demo.common.error.BusinessError;
    import com.springboot.demo.common.error.EmBusinessError;
    import com.springboot.demo.common.response.CommonReturnType;
    import org.springframework.http.HttpStatus;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.ResponseStatus;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.util.HashMap;
    import java.util.Map;
    
    
    public class BaseController { 
        // 定义异常类
        @ExceptionHandler(Exception.class)
        // 获取异常返回200
        @ResponseStatus(HttpStatus.OK)
        @ResponseBody//返回json
        public Object handleException(HttpServletRequest request, Exception ex) { 
            // 模块抛出异常，被注解exceptionHandle拦截到进入此类，状态设置200 返回null；
            Map<String, Object> map = new HashMap<>();
            // 判断ex是否BusinessError异常
            if (ex instanceof BusinessError) { 
                // 强转为自定义异常
                BusinessError businessError = (BusinessError) ex;
    
                map.put("errCode", businessError.getCode());
                map.put("errMsg", businessError.getErrMsg());
    
            } else { 
    
                map.put("errCode", EmBusinessError.UNKNOWN_ERROR.getCode());
                map.put("errMsg", EmBusinessError.UNKNOWN_ERROR.getErrMsg());
    
            }
            return CommonReturnType.create(map, "fail");
    
    
        }
    
    
    }

**运行**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 9]

--------------------

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 10]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 11]**若id没有找到，为空进入判断，自定义抛出异常**

**运行**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU1MDQ5MA_size_16_color_FFFFFF_t_70 12]

[SpringBoot_ _]: https://blog.csdn.net/weixin_44550490/article/details/102579263
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