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SpringMVC异常处理

1.创建控制器

@Controllerpublic class ExceptionController {
       @RequestMapping("Welcome")    public String welcome() throws SysException {
           try {
               int i = 10/0;        } catch (Exception e) {
               System.out.println("出错了");            e.printStackTrace();            throw new SysException("出错了");        }        return "items/Welcome";    }}

我通过配置让访问localhost:8080/Welccome.do可以执行welcome()方法

public class SysException extends Exception{
       String message;    @Override    public String getMessage() {
           return message;    }    public void setMessage(String message) {
           this.message = message;    }    public SysException(String message){
           this.message=message;    }}

3.定义异常处理器

public class SysExceptionHandler implements HandlerExceptionResolver {
       @Override    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e){
           SysException ex = null;        if(e instanceof SysException){
               ex = (SysException)e;        }else{
               ex = new  SysException("系统正在维护中");        }        ModelAndView mav = new ModelAndView();        mav.setViewName("error");        mav.addObject("error", ex.getMessage());        return mav;    }}

4.在SpringMVC.xml里面配置使得SysExceptionHandler被创建来监听异常

5.自定义异常页面

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

6.演示

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