springBoot中全局异常处理，针对ajax响应（包括Rest接口请求）和页面请求响应

矫情吗；* 2023-06-23 13:11 92阅读 0赞

完善的异常处理可以让客户端有一个良好的体验，并且有利于定位出错原因，帮助更好的解决问题。  
SpringBoot 内置了一个 /error 处理，当抛出异常之后，会被转到这个映射进行处理， 就是常见的 Whitelable Error Page  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70]  
另外一种就是使用ajax请求，SpringBoot会返回如下的Json格式字符串信息‘’  
![在这里插入图片描述][20191219112010214.png]  
原理很简单，SpringBoot默认提供了程序出错的结果映射路径/error。这个/error请求是会在BasicErrorController中进行处理，其内部是通过判断请求头中的Accept的内容是否是text/html来区分是客户端浏览器（浏览器通常默认自动发送请求头内容Accept：text/html）还是客户端接口的调用，以此来决定返回视图还是JSON消息的内容,如下图是BasicErrorController的底层源码（在idea中三次按shift键将进入底层源码）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 2]

#### 定义一个简单的error.html页面 ####

<!DOCTYPE html>
    <html xmlns:th="http://www.thymeleaf.org" >
    <head>
        <meta charset="UTF-8"/>
        <title>error</title>
    </head>
    <body>
    server error
    <p th:text="${errorMessage}"/>
    </body>
    </html>

#### 定义一个全局的GlobalRestExceptionHandler类来进行处理ajax响应和页面请求响应 ####

/**
     * @Description: 全局异常处理，针对ajax响应和页面请求响应
     */
    @RestControllerAdvice
    public class GlobalRestExceptionHandler {
    
        private Logger logger = LoggerFactory.getLogger(getClass());
    
        @ExceptionHandler(Exception.class)
        public Object exception(HttpServletRequest reqest, HttpServletResponse response,HandlerMethod handlerMethod, Exception exception) {
    
            Method m = handlerMethod.getMethod();
            Class<?> clazz = handlerMethod.getBeanType();
            //判断访问的url是否为rest接口请求
            boolean isRestReq = (m.getAnnotation(ResponseBody.class)!=null
                    ||clazz.getAnnotation(ResponseBody.class)!=null
                    ||clazz.getAnnotation(RestController.class)!=null);
            //判断访问的url是否为ajax请求
            boolean isAjax = isAjax(reqest);
            if (isAjax||isRestReq) {
                logger.error("global exception", exception);
                if (exception instanceof VeException) {
                    return ResultInfo.fail(VeErrorCode.UNKNOWN_EXCEPTION, exception.getMessage());
                }
                return ResultInfo.fail(VeErrorCode.UNKNOWN_EXCEPTION);
            } else {
                logger.error("界面请求异常", exception);
                ModelAndView mv = new ModelAndView();
                if (exception instanceof VeException) {
                    mv.addObject("errorMessage", exception.getMessage());
                    mv.setViewName("error");
                    return mv;
                }
                mv.addObject("errorMessage", "");
                mv.setViewName("error");
                return mv;
            }
        }
    
        /**
         * 判断网络请求是否为ajax
         *
         * @param req
         * @return
         */
        private boolean isAjax(HttpServletRequest req) {
            String contentTypeHeader = req.getHeader("Content-Type");
            String acceptHeader = req.getHeader("Accept");
            String xRequestedWith = req.getHeader("X-Requested-With");
            return (contentTypeHeader != null && contentTypeHeader.contains("application/json"))
                    || (acceptHeader != null && acceptHeader.contains("application/json"))
                    || "XMLHttpRequest".equalsIgnoreCase(xRequestedWith);
        }
    }

#### VeException 中的内容 ####

**
     * 全局异常
     */
    public class VeException extends RuntimeException {
        private String code;
        private String message;
    
        public VeException(VeErrorCode errorCode) {
            super(errorCode.getCode());
            this.code = errorCode.getCode();
            this.message = errorCode.getMessage();
        }
    
        public String getCode() {
            return code;
        }
    
        @Override
        public String getMessage() {
            return message;
        }
    }

#### VeErrorCode中的内容 ####

public enum VeErrorCode {
     UNKNOWN_EXCEPTION("unknown_exception","系统内部错误")；
       private String code;
        private String message;
    
    
        private VeErrorCode(String code, String message) {
            this.code = code;
            this.message = message;
        }
    
        public String getCode() {
            return code;
        }
    
        public void setCode(String code) {
            this.code = code;
        }
    
        public String getMessage() {
            return message;
        }
    
        public void setMessage(String message) {
            this.message = message;
        }
    }

测试：将会出现两种

##### ajax请求响应![在这里插入图片描述][20191219153449679.png] #####

![在这里插入图片描述][2019121915393356.png]

##### 页面请求响应 #####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][20191219153731656.png]  
测试成功  
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[20191219112010214.png]: https://img-blog.csdnimg.cn/20191219112010214.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191219145100446.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191219145313224.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ3NjUyMA==,size_16,color_FFFFFF,t_70
[20191219153449679.png]: https://img-blog.csdnimg.cn/20191219153449679.png
[2019121915393356.png]: https://img-blog.csdnimg.cn/2019121915393356.png
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[20191219153731656.png]: https://img-blog.csdnimg.cn/20191219153731656.png