SpringBoot(6) SpringBoot配置全局异常

1、全局异常

@ControllerAdvice 如果是返回json数据 则用 RestControllerAdvice,就可以不加 @ResponseBody
//捕获全局异常,处理所有不可知的异常
@ExceptionHandler(value=Exception.class)

@RestControllerAdvice
public class CustomExtHandler {

    private static final Logger LOG = LoggerFactory.getLogger(CustomExtHandler.class);

    
    //捕获全局异常,处理所有不可知的异常
    @ExceptionHandler(value=Exception.class)
    Object handleException(Exception e,HttpServletRequest request){
        LOG.error("url {}, msg {}",request.getRequestURL(), e.getMessage()); 
        Map<String, Object> map = new HashMap<>();
            map.put("code", 100);
            map.put("msg", e.getMessage());
            map.put("url", request.getRequestURL());
            return map;
    }
    
}

2、自定义异常类型

自定义异常类型MyException

/*
 * 功能描述: 建立自定义异常类 -- 继承运行异常最高类
 * 
 * */

public class MyException extends RuntimeException{
    
    public MyException(String code, String msg){
        this.code = code;
        this.msg = msg;
    }
    
    private String code;
    private String msg;
    
    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

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

}

修改CustomExtHandler

@RestControllerAdvice
public class CustomExtHandler {

    private static final Logger LOG = LoggerFactory.getLogger(CustomExtHandler.class);

    
    //捕获全局异常,处理所有不可知的异常
    @ExceptionHandler(value=Exception.class)
    Object handleException(Exception e,HttpServletRequest request){
        LOG.error("url {}, msg {}",request.getRequestURL(), e.getMessage()); 
        Map<String, Object> map = new HashMap<>();
            map.put("code", 100);
            map.put("msg", e.getMessage());
            map.put("url", request.getRequestURL());
            return map;
    }

    /**
     * 功能描述: 处理自定义异常类
     * @return
     * 
     */
    @ExceptionHandler(value = MyException.class)
    Object handleMyException(MyException e, HttpServletRequest request){
        //进行页面跳转
//        ModelAndView modelAndView = new ModelAndView();
//        modelAndView.setViewName("error.html");
//        modelAndView.addObject("msg", e.getMessage());
//        return modelAndView;
        
        //f返回json数据
        Map<String, Object> map = new HashMap<>();
        map.put("code", e.getCode());
        map.put("msg", e.getMessage());
        map.put("url", request.getRequestURL());
        return map;
    }
}

模拟一个异常实现页面跳转

/**
 * 功能描述: 模拟自定义异常
 * @return
 */
@RequestMapping(value = "/api/v1/myext")  
public Object myext() {
    throw new MyException("500", "my ext异常");
}
    

最后梳理顺序：

　　首先，建立自定义异常类 MyException，继承于RuntimeException。如果出异常，在@RestControllerAdvice注释下的CustomExtHandler里面捕获，根据异常种类进行处理。

异常处理的官网地址： https://docs.spring.io/spring-boot/docs/2.1.0.BUILD-SNAPSHOT/reference/htmlsingle/#boot-features-error-handling