Spring MVC 处理异常

SpringMVC处理异常：

　　1 使用@ExceptionHandler注解

　　　　只有ModelAndView可以携带错误信息

    @ExceptionHandler
    public ModelAndView handleException(Exception ex) {
        System.out.println("出现异常：" + ex);
        ModelAndView mv = new ModelAndView();
        mv.setViewName("error");//转到error.jsp
        mv.addObject("exception", ex);
        return mv;
    } 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isErrorPage="true"%>

<!-- 打印异常信息 -->
<%=exception.getMessage() %>

${exception.message}

　　2 使用@ExceptionHandler处理特定类型的异常

public class LackParamException extends ServletException{
   
　　 private static final long serialVersionUID = 1L;
  
　　 public LackParamException() {
        super("缺少参数");
    }

    public LackParamException(String msg) {
        super(msg);
    }
}

    @ExceptionHandler(LackParamException.class)
    public ModelAndView handleException(Exception ex) {
        System.out.println("出现异常：" + ex);
        ModelAndView mv = new ModelAndView();
        mv.setViewName("error");
        mv.addObject("exception", ex);
        return mv;
    }

    @RequestMapping("test_exception")
    public String testException(String str) throws LackParamException {
        if(StringUtils.isEmpty(str)) {
            throw new LackParamException();
        }
        return "success";
    }

　　3 使用@ControllerAdvice织入全局异常

//异常切面：将本类内部的@ExceptionHandler方法织入到所有的@RequestMapping方法
@ControllerAdvice
public class MyExceptionHandler {
    @ExceptionHandler(Exception.class)
    public ModelAndView handleException(Exception ex) {
        System.out.println("出现全局异常：" + ex);
        ModelAndView mv = new ModelAndView();
        mv.setViewName("error");
        mv.addObject("exception", ex);
        return mv;
    }
}

 <!-- 扫描异常处理 -->
 <context:component-scan base-package="com.roxy.springmvc.exception">
 </context:component-scan>