项目异常处理

项目异常分类

• 业务异常 (BusinessException)
  • 规范的用户行为产生的异常
  • 不规范的用户行为操作产生的异常
• 系统异常(SystemException)
  • 项目运行过程中可预计且无法避免的异常
• 其他异常 (Exception)
  • 编程人员未预期到的异常

项目异常处理方案

• 业务异常 (BusinessException)
  • 发送对应消息传递给用户，提醒规范操作
• 系统异常（SystemException)
  • 发送固定消息传递给用户，安抚用户
  • 发送特定消息给运维人员，提醒维护
  • 记录日志
• 其他异常 (Exception)
  • 发送固定消息传递给用户，安抚用户
  • 发送特定消息给编程人员，提醒维护（纳入预期范围内）
  • 记录日志

SystemException.java

package com.xxx.exception;

public class SystemException extends RuntimeException{
    private Integer code;

    public Integer getCode() {
        return code;
    }

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

    public SystemException(Integer code, String message) {
        super(message);
        this.code = code;
    }

    public SystemException(Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }
}

BusinessException.java

package com.xxx.exception;

public class BusinessException extends RuntimeException{
    private Integer code;

    public Integer getCode() {
        return code;
    }

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

    public SystemException(Integer code, String message) {
        super(message);
        this.code = code;
    }

    public SystemException(Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }
}

BookServiceImpl.java

package com.xxx.service.impl;

public class BookServiceImpl implements BookService {

    @Autowired
    private BookDao bookDao;

    public boolean save(Book book){
        bookDao.save(book);
        return true;
    }

    public boolean update(Book book){
        bookDao.update(book);
        return true;
    }

    public boolean delete(Integer id){
        bookDao.delete(id);
        return true;

    }

    public Book getById(Integer id){
        if(id == 1){
            throw new BusinessException(Code.BUSINESS_ERR, "请不要使用你的技术挑战我的耐性！");
        }
        //将可能出现的异常进行包装，转换程自定义异常
        try{
            int i = 1/0;

        }catch(ArithmeticException e){
            throw new SystemException(Code.SYSTEM_TIMMEOUT_ERR, "服务器访问超时，请重试！", e);
        }

        return bookDao.getById(id);
    }

    public List<Book> getAll(){
        return bookDao.getAll();
    }

}

Code.java

package com.xxx.controller;

public class Code {
    public static final Integer SAVE_OK = 20011;
    public static final Integer DELETE_OK = 20021;
    public static final Integer UPDATE_OK = 20031;
    public static final Integer GET_OK = 20041;

    public static final Integer SAVE_ERR = 20010;
    public static final Integer DELETE_ERR = 20020;
    public static final Integer UPDATE_ERR = 20030;
    public static final Integer GET_ERR = 20040;

    public static final Integer SYSTEM_ERR = 50001;
    public static final Integer SYSTEM_TIMEOUT_ERR = 50002;
    public static final Integer SYSTEM_UNKNOW_ERR = 59999;

    public static final Integer BUSINESS_ERR = 60002;
}

ProjectExceptionAdvice.java

package com.xxx.controller;

@RestControllerAdvice
public class ProjectExceptionAdvice {
    @ExceptionHandler(SystemException.class)
    public Result doSystemException(SystemException ex){
        //记录日志
        //发送消息给运维
        //发送邮件给开发人员
        return new Result(ex.getCode(), null, ex.getMessage());
    }

    @ExceptionHandler(BusinessException.class)
    public Result doBusinessException(BusinessException ex){
        return new Result(ex.getCode(), null, ex.getMessage());
    }

    @ExceptionHandler(Exception.class)
    public Result doException(Exception ex){
        //记录日志
        //发送消息给运维
        //发送邮件给开发人员
        return new Result(Code.SYSTEM_UNKNOW_ERR, null, "系统繁忙，请稍后再试！");
    }
}