03_springboot错误处理.md

1.添加异常,在HelloController代码段内，添加异常，方便进行测试。

 	@RequestMapping("/hello")
    public String hello(Model m) throws Exception {
        m.addAttribute("now", DateFormat.getDateTimeInstance().format(new Date()));
        if(true){
            throw new Exception("some exception");
        }
        return "hello";
    }

}

2.新增GlobalExceptionHandle,用于捕获Exception异常及其子类，且将其跳转到errorPage页面内。

@ControllerAdvice
public class GlobalExceptionHandler {
    @ExceptionHandler(value = Exception.class)
    public ModelAndView defaultErrorHandler(HttpServletRequest req, Exception e) throws Exception {
        ModelAndView mav = new ModelAndView();
        mav.addObject("exception", e);
        mav.addObject("url", req.getRequestURL());
        mav.setViewName("errorPage");
        return mav;
    }

}

3.errorPage页面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<div style="500px;border:1px solid lightgray;margin:200px auto;padding:80px">
    系统 出现了异常，异常原因是：
    ${exception}
    <br><br>
    出现异常的地址是：
    ${url}
</div>

4.打开http://127.0.0.1:8080/hello页面，进行测试