SpringMVC学习笔记（七）处理异常

参考

（1）《spring入门经典》（基于本书第三章）

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代码结构

程序清单

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.zqx</groupId>
  <artifactId>SpringMVCExceptionhandling</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>SpringMVCExceptionhandling Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.1.7.RELEASE</version>
    </dependency>
  </dependencies>
  <build>
    <finalName>SpringMVCExceptionhandling</finalName>
  </build>
</project>

web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
      http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context-4.0.xsd
                           http://www.springframework.org/schema/mvc
                           http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <context:component-scan base-package="com.wiley.beginningspring.ch3" />
    <context:annotation-config />
    <mvc:annotation-driven />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

UserController.java

package com.wiley.beginningspring.ch3.controller;

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 com.wiley.beginningspring.ch3.domain.User;
import com.wiley.beginningspring.ch3.exception.UserNotFoundException;

import javax.annotation.PostConstruct;
import java.util.HashMap;
import java.util.Map;

@Controller
public class UserController {

    private Map<String, User> users = new HashMap<String, User>();

    @PostConstruct
    public void setup() {
        users.put("mert", new User("Mert", "Caliskan"));
        users.put("kenan", new User("Kenan", "Sevindik"));
    }

    @RequestMapping(value = "/form")
    public ModelAndView user() {
        return new ModelAndView("userForm", "user", new User());
    }

    @RequestMapping(value = "/result")
    public ModelAndView processUser(String name) throws Exception {
        ModelAndView modelAndView = new ModelAndView();
        User user = users.get(name);
        if ("johndoe".equals(name)) {
            throw new Exception();
        }
        if (user == null) {
            throw new UserNotFoundException(name);
        }
        modelAndView.addObject("u", user);
        modelAndView.setViewName("userResult");

        return modelAndView;
    }

    @ExceptionHandler(UserNotFoundException.class)
    public ModelAndView handleException(UserNotFoundException e) {
        ModelAndView modelAndView = new ModelAndView("errorUser");
        modelAndView.addObject("errorMessage", e.getMessage());
        return modelAndView;
    }
}

User.java

package com.wiley.beginningspring.ch3.domain;


public class User {

    private String name;
    private String lastName;

    public User() {
    }

    public User(String name, String lastName) {
        this.name = name;
        this.lastName = lastName;
    }

    public String getName() {
        return name;
    }

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

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

UserNotFoundException.java

package com.wiley.beginningspring.ch3.exception;

public class UserNotFoundException extends Exception {

    public UserNotFoundException(String name) {
        super("User not found with name: " + name);
    }
}

GlobalExceptionHandler.java

package com.wiley.beginningspring.ch3.handler;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(Exception.class)
    public ModelAndView handleException() {
        return new ModelAndView("errorGlobal");
    }
}

测试

（1）当输入Mert或者Kenan时：


（2）当输入johndoe时：

（3）当输入其它，例如aaaa时：