SpringMVC学习笔记八:文件上传及多个文件上传

SpringMVC实现文件上传需要加入jar包,commons-fileupload-1.3.1.jar,commons-io-2.2.jar

项目目录树:

pom.xml加入需要的包

<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>springMVC</groupId>
  <artifactId>springmvc01</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>springmvc01 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>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.2.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.7.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.7.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.7.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>5.2.4.Final</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>

  </dependencies>
  <build>
    <finalName>springmvc01</finalName>
  </build>
</project>

web.xml配置

<!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>

<!-- 注册字符集Filter -->
<filter>
    <filter-name>characterEncodingFiter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>GBK</param-value>
    </init-param>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>characterEncodingFiter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 注册springMVC中央调度器 -->
<servlet>
    <servlet-name>springMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>springMVC</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

</web-app>

spring-mvc.xml SpringMVC的配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        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">

    <!-- 扫描注解 -->
    <context:component-scan base-package="com.orange.controller" />    

    <!-- 注册multipart解析器,这个id是固定的,由DispatcherServlet直接调用 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="GBK" />
        <property name="maxUploadSize" value="102400"></property>
        <!-- 改属性延迟解析,当进入Controller时开始解析,这样就可以捕获到异常,否则由SpringMVC抛出异常时无法捕获 -->
        <property name="resolveLazily" value="true"></property>
    </bean>
</beans>

控制器UploadController.java

package com.orange.controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(value="/upload")
public class UploadController {

    @RequestMapping(value="/upload")
    public String doUpload(@RequestParam MultipartFile photo, HttpSession session) throws Exception{

        if(!photo.isEmpty()){
            String path = session.getServletContext().getRealPath("/upload");
            String fileName = photo.getOriginalFilename();
            if(fileName.endsWith(".jpg") || fileName.endsWith(".png")){
                File file = new File(path, fileName);

                photo.transferTo(file);
            } else {
                return "/fail.jsp";
            }
        }

        return "/success.jsp";
    }
    //拦截异常,当上传文件的大小超过1024 1M时会抛出MaxUploadSizeExceededException
    @ExceptionHandler(MaxUploadSizeExceededException.class)
    public ModelAndView exceptionUpload(Exception ex) throws Exception{
        ModelAndView mav = new ModelAndView();
        mav.addObject("ex", ex);
        mav.setViewName("/fail.jsp");
        return mav;
    }
}

需要在webapp下创建目录upload

测试:上传图片

修改SpringMVC的配置文件spring-mvc.xml,把上传限制为1024,这时上传的文件大于1024,或抛出异常

<property name="maxUploadSize" value="1024"></property>

注意点:必须在spring-mvc.xml注册umltipart解析器时,配置<property name="resolveLazily" value="true"></property>,否则无法使用异常处理器拦截异常,应该不配置时,

是由springmvc框架抛出异常,无法拦截,但配置后,会延迟解析,进入Controller时才解析抛出异常,这时注册异常处理器就可以拦截到

如果上传多个文件,修改Controller中的配置为

package com.orange.controller;

import java.io.File;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(value="/upload")
public class UploadController {

    @RequestMapping(value="/upload")
    public String doUpload(@RequestParam MultipartFile[] photo, HttpSession session) throws Exception{

        for(int i=0; i<photo.length; i++){
            if(!photo[i].isEmpty()){
                String path = session.getServletContext().getRealPath("/upload");
                String fileName = photo[i].getOriginalFilename();
                if(fileName.endsWith(".jpg") || fileName.endsWith(".png")){
                    File file = new File(path, fileName);

                    photo[i].transferTo(file);
                } else {
                    return "/fail.jsp";
                }
            }
        }

        return "/success.jsp";
    }

    @ExceptionHandler(MaxUploadSizeExceededException.class)
    public ModelAndView exceptionUpload(Exception ex) throws Exception{
        ModelAndView mav = new ModelAndView();
        mav.addObject("ex", ex);
        mav.setViewName("/fail.jsp");
        return mav;
    }
}

修改上传upload.jsp

<%@ page language="java" contentType="text/html; charset=GBK"
    pageEncoding="GBK"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<base href="<%=basePath %>">
<title>Default Page</title>
</head>
<body>

<div>
    <form action="upload/upload" enctype="multipart/form-data" method="post">
        照片:<input type="file" name="photo"><br>
        照片:<input type="file" name="photo"><br>
        照片:<input type="file" name="photo"><br>
        照片:<input type="file" name="photo"><br>
        照片:<input type="file" name="photo"><br>
        <input type="submit" value="上传">
    </form>
</div>

</body>
</html>

修改spring-mvx.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:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        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">

    <!-- 扫描注解 -->
    <context:component-scan base-package="com.orange.controller" />    

    <!-- 注册multipart解析器,这个id是固定的,由DispatcherServlet直接调用 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="GBK" />
        <!-- 上传的文件总大小 -->
        <property name="maxUploadSize" value="1024000000"></property>
        <!-- 每个上传的文件的大小 -->
        <property name="maxUploadSizePerFile" value="102400"></property>
        <!-- 改属性延迟解析,当进入Controller时开始解析,这样就可以捕获到异常,否则由SpringMVC抛出异常时无法捕获 -->
        <property name="resolveLazily" value="true"></property>
    </bean>
</beans>

多文件上传这里就不在演示了