1.自定义异常类与自定义异常处理器

    1).自定义异常类

/***自定义异常类继承Exception*/public class SysException extends Exception {    private String message;    @Override    public String getMessage() {        return message;    }        public SysException(String message){        this.message=message;    }}

   2).自定义异常处理器

/** * 自定义异常处理器实现HandlerExceptionResolver接口 */public class SysExceptionResolve implements HandlerExceptionResolver {    @Override    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {        ModelAndView mv = new ModelAndView();        SysException sysException =null;        if(e instanceof SysException){              sysException= (SysException) e;        }else {            sysException = new SysException("服务器进入二次元了");        }        mv.addObject("message",sysException.getMessage());        mv.setViewName("error");        return mv;    }}

 

2.配置自定义异常处理器和编写error友好界面

      1). 在resources目录下的xml文件中配置bean

    2).编写error友好界面

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>        
${message}

 

3.测试结果

  测试结果的前台代码

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
Hello World!
  Exception测试

测试结果的后台代码

@Controller@RequestMapping("/user")public class UserController {     @RequestMapping("/exception")    public String testException() throws SysException {         System.out.println("testException...");         try {             int a = 10/0;         } catch (Exception e) {             e.printStackTrace();             throw new SysException("查询数据出错了");         }         return "success";    }}