9、SpringMVC异常处理解决方案
1、自定义异常类
/**
* 自定义异常类
*/
public class SysException extends Exception{
//存储提示信息
private String message;
public SysException(String message) {
this.message = message;
}
@Override
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
2、处理异常业务逻辑
public class SysExceptionResolver implements HandlerExceptionResolver{
/**
* 处理异常业务逻辑
* @param httpServletRequest
* @param httpServletResponse
* @param o
* @param ex
* @return
*/
@Override
public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception ex) {
//获取到异常对象
SysException e = null;
if(ex instanceof SysException){
e = (SysException)ex;
}else{
e = new SysException("系统正在维护");
}
//创建ModelAndView对象
ModelAndView mv = new ModelAndView();
mv.addObject("errorMsg", e.getMessage());
mv.setViewName("error");
return mv;
}
}
3、配置异常处理器
<!--配置异常处理器-->
<bean id="sysExceptionResolver" class="com.example.exception.SysExceptionResolver"></bean>
4、请求页
<a href="testException">异常处理</a>
5、控制器
@Controller
public class UserController {
@RequestMapping("/testException")
public String testException() throws SysException {
try {
//模拟异常
int i= 10/0;
} catch (Exception e) {
//打印异常信息
e.printStackTrace();
//抛出自定义异常信息
throw new SysException("分母不能为零");
}
return "success";
}
}
6、错误页面
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${errorMsg}
</body>
</html>
解析
