SpringMVC的异常处理

最新推荐文章于 2024-06-20 01:17:21 发布

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最新推荐文章于 2024-06-20 01:17:21 发布

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本文链接：https://blog.youkuaiyun.com/qq_36074043/article/details/77684501

本文介绍Spring MVC框架中的异常处理机制及数据校验方法，包括自定义异常类、异常控制器、日期格式转换等内容。

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数据异常处理

首先这个小示例，是我们在代码中什么一个错然后让他遇到错跳转页面：

1.我们执行的时候在地址栏输入我们对应的@RequestMapping的值然后，对应走页面，

package cn.happy.springmvc07exection;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Created by linlin on 2017/8/28.
 */
@Controller
public class FirstController {
    @RequestMapping("/first")
    public String list(){
        //构造异常
        int result=5/0;
        return "/WEB-INF/first.jsp";
    }


}

<context:component-scan base-package="cn.happy.springmvc07exection"></context:component-scan>
  <!--异常处理器-->
 <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="defaultErrorView" value="/error.jsp"></property>
    <property name="exceptionAttribute" value="ex"></property>

我们对应就会走error页面。

==================================================================

第二个根据年龄和 name名字判断。

效果：

首先我们建一个实体类：

package cn.happy.springmvc07exection.exceptions;

/**
 * Created by Happy on 2017-08-20.
 */
public class UserInfo {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

自己定义一个异常：

package cn.happy.springmvc07exection.exceptions;

/**
 * Created by linlin on 2017/8/28.
 */
public class UserException  extends Exception {
    public UserException() {
    }

    public UserException(String message) {
        super(message);
    }
}

在定义2个异常类：

package cn.happy.springmvc07exection.exceptions;

/**
 * Created by linlin on 2017/8/28.
 */
public class NameException extends UserException {
    public NameException() {
    }

    public NameException(String message) {
        super(message);
    }
}

package cn.happy.springmvc07exection.exceptions;

/**
 * Created by linlin on 2017/8/28.
 */
public class AgeException extends  UserException {
    public AgeException() {
    }

    public AgeException(String message) {
        super(message);
    }
}

这个Controller 就是判断用的，我们在页面输入值，如果年龄大于80或者name不等于admin我们就走异常。

package cn.happy.springmvc07exection;

import cn.happy.springmvc07exection.exceptions.AgeException;
import cn.happy.springmvc07exection.exceptions.NameException;
import cn.happy.springmvc07exection.exceptions.UserException;
import cn.happy.springmvc07exection.exceptions.UserInfo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Created by linlin on 2017/8/28.
 */
@Controller
public class SecondController {
        @RequestMapping("/firstExcetpion")
        public String doFirst(UserInfo info) throws UserException {
            if (!info.getName().equals("admin")) {
                //不是admin，抛出一个Name出错异常
                throw new NameException("用户名异常");
            }
            if (info.getAge()>60) {
                throw new AgeException("年龄异常");
            }
            return "/index.jsp";
        }
    }

页面：

<%--
  Created by IntelliJ IDEA.
  User: linlin
  Date: 2017/8/28
  Time: 10:02
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@page isELIgnored="false" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>异常提升</h1>
<form action="${pageContext.request.contextPath }/firstExcetpion" method="post">
    姓名:<input name="name"/><br/><br/>
    年龄:<input name="age"/><br/><br/>
    <input type="submit" value="注册"/>
</form>

</body>
</html>

配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">

<context:component-scan base-package="cn.happy.springmvc07exection"></context:component-scan>
  <!--异常处理器-->
 <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
    <property name="defaultErrorView" value="/error.jsp"></property>
    <property name="exceptionAttribute" value="ex"></property>

   <property name="exceptionMappings">
      <props>
        <prop key="cn.happy.springmvc07exection.exceptions.AgeException">Age.jsp</prop>
        <prop key="cn.happy.springmvc07exection.exceptions.NameException">Name.jsp</prop>
      </props>
    </property>
  </bean>
<!--<bean class="cn.happy.springmvc08selfexception.exceptionhandler.MyHanlderExceptionResolver"></bean>-->
</beans>

数据校验（日期）：、

package cn.happy.springmvc10;

import org.springframework.core.convert.converter.Converter;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Pattern;

/**
 * Created by linlin on 2017/8/28.
 */
public class MyConverter implements Converter<String,Date> {
    public Date convert(String source) {
        SimpleDateFormat sdf=getDateFormat(source);
        try {
            return sdf.parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

    private SimpleDateFormat getDateFormat(String source) {
        SimpleDateFormat sdf=null;
        if (Pattern.matches("\\d{4}-\\d{2}-\\d{2}",source)){
            sdf=new SimpleDateFormat("yyyy-MM-dd");
        }else if (Pattern.matches("\\d{4}/\\d{2}/\\d{2}",source)){
            sdf=new SimpleDateFormat("yyyy/MM/dd");
        }else if (Pattern.matches("\\d{4}\\d{2}\\d{2}",source)){
            sdf=new SimpleDateFormat("yyyyMMdd");
        }
        return sdf;
    }
}

package cn.happy.springmvc10;

import org.springframework.beans.TypeMismatchException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;

/**
 * Created by linlin on 2017/8/28.
 */
@Controller
public class FirstController {

    @ExceptionHandler(TypeMismatchException.class)
    public ModelAndView exceptionHandler(HttpServletRequest request){
        ModelAndView mv=new ModelAndView();
        //放入request作用域中
        mv.addObject("date",request.getParameter("birthday"));
        mv.setViewName("MyConverter.jsp");
        return mv;
    }
    @RequestMapping("/first")
    public String doFirst(Date birthday, int age){
        return "index.jsp";
    }
}

页面传值在Controller进行校验：

<%--
  Created by IntelliJ IDEA.
  User: linlin
  Date: 2017/8/28
  Time: 12:00
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@page isELIgnored="false" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>类型转换</h1>
<form action="${pageContext.request.contextPath }/first" method="post">
    出生日期:<input name="birthday" value="${date}"/><br/><br/>
    年龄:<input name="age" value="${age}"/><br/><br/>
    <input type="submit" value="注册"/>
</form>
</body>
</html>

并且如果我们在日期哪里输入的是错误信息（汉字）的我们会跳转回当前页面，并且保留数据，我们已经把数据存了起来。