SpringMVC中@ControllerAdvice/@RestControllerAdvice注解，全局异常处理

参考：https://www.cnblogs.com/lenve/p/10748453.html
http://doc.ruoyi.vip/ruoyi/document/htsc.html#%E5%BC%82%E5%B8%B8%E5%A4%84%E7%90%86
@ControllerAdvice/@RestControllerAdvice:增强控制器，可以用来做 全局异常处理、全局数据绑定、全局数据预处理。
1、ajax请求异常，返回类AjaxResult

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package com.jay.SpringBootStudy8.config;   import java.util.HashMap;   /**  * 操作消息提醒  *  * @author ruoyi  */ public class AjaxResult extends HashMap<String, Object> {     private static final long serialVersionUID = 1L;       /**      * 返回错误消息      *      * code 错误码      * msg 内容      * return 错误消息      */     public static AjaxResult error(String msg)     {         AjaxResult json = new AjaxResult();         json.put("msg", msg);         json.put("code", 500);         return json;     }       /**      * 返回成功消息      */     public static AjaxResult success(String msg)     {         AjaxResult json = new AjaxResult();         json.put("msg", msg);         json.put("code", 0);         return json;     } }

2、自定义异常类

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package com.jay.SpringBootStudy8.config; /* 自定义异常类  */ public class CustomerException extends Exception {     private static final long serialVersionUID = 1L;     protected final String message;     public CustomerException(String msg) {         this.message = msg;     }     @Override     public String getMessage() {         return message;     } }

3、全局异常处理类，其中判断是否是ajax请求，是用请求头信息来判断的，测试的时候注意，这个Handler需要用@RestControllerAdvice标注，使用@ControllerAdvice标注的话，ajax请求返回的是Exception而不是我们自定义的异常类了。

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package com.jay.SpringBootStudy8.config;   import com.jay.SpringBootStudy8.utils.ServletUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.RestControllerAdvice; import org.springframework.web.servlet.ModelAndView;   import javax.servlet.http.HttpServletRequest;   @RestControllerAdvice public class GlobalExceptionHandler {     private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);     /**      * 异常      */     @ExceptionHandler(CustomerException.class)     public Object customerExceptionJson(HttpServletRequest request, CustomerException e)     {         String msg = e.getMessage();         log.error(msg, e);         if (ServletUtils.isAjaxRequest(request)){             return AjaxResult.error(msg);         }         else{             ModelAndView mv = new ModelAndView();             mv.addObject("msg", msg);             mv.setViewName("/error/500");             return mv;         }     } }

4、使用：throw new CustomerException("test data");
5、判断是否ajax请求的类是从 若依 拷贝出来的

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package com.jay.SpringBootStudy8.utils;   import java.io.IOException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;   import cn.hutool.core.convert.Convert; import org.springframework.web.context.request.RequestAttributes; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes;   /**  * 客户端工具类  *  * @author ruoyi  */ public class ServletUtils {     /**      * 获取String参数      */     public static String getParameter(String name)     {         return getRequest().getParameter(name);     }       /**      * 获取String参数      */     public static String getParameter(String name, String defaultValue)     {         return Convert.toStr(getRequest().getParameter(name), defaultValue);     }       /**      * 获取Integer参数      */     public static Integer getParameterToInt(String name)     {         return Convert.toInt(getRequest().getParameter(name));     }       /**      * 获取Integer参数      */     public static Integer getParameterToInt(String name, Integer defaultValue)     {         return Convert.toInt(getRequest().getParameter(name), defaultValue);     }       /**      * 获取request      */     public static HttpServletRequest getRequest()     {         return getRequestAttributes().getRequest();     }       /**      * 获取response      */     public static HttpServletResponse getResponse()     {         return getRequestAttributes().getResponse();     }       /**      * 获取session      */     public static HttpSession getSession()     {         return getRequest().getSession();     }       public static ServletRequestAttributes getRequestAttributes()     {         RequestAttributes attributes = RequestContextHolder.getRequestAttributes();         return (ServletRequestAttributes) attributes;     }       /**      * 将字符串渲染到客户端      *      * @param response 渲染对象      * @param string 待渲染的字符串      * @return null      */     public static String renderString(HttpServletResponse response, String string)     {         try         {             response.setContentType("application/json");             response.setCharacterEncoding("utf-8");             response.getWriter().print(string);         }         catch (IOException e)         {             e.printStackTrace();         }         return null;     }       /**      * 是否是Ajax异步请求      *      * @param request      */     public static boolean isAjaxRequest(HttpServletRequest request)     {         String accept = request.getHeader("accept");         if (accept != null && accept.indexOf("application/json") != -1)         {             return true;         }           String xRequestedWith = request.getHeader("X-Requested-With");         if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1)         {             return true;         }           String uri = request.getRequestURI();         if (inStringIgnoreCase(uri, ".json", ".xml"))         {             return true;         }           String ajax = request.getParameter("__ajax");         if (inStringIgnoreCase(ajax, "json", "xml"))         {             return true;         }         return false;     }     //最后这两个方法是从 若依 StringUtils中复制来的     public static boolean inStringIgnoreCase(String str, String... strs)     {         if (str != null && strs != null)         {             for (String s : strs)             {                 if (str.equalsIgnoreCase(trim(s)))                 {                     return true;                 }             }         }         return false;     }     /*      去空格      */     public static String trim(String str)     {         return (str == null ? "" : str.trim());     } }