SpringMVC（十七）文件上传

SpringMVC中实现文件上传需要两个jar包

主要是CommonsMultipartResolver解析器依赖commons-fileupload和commons-io这两个jar包

<!--文件上传  jar-->
        <!--fileupload-->
        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!--io-->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>1.4</version>
        </dependency>

一。实现单文件上传

先准备页面

<%--
  Created by IntelliJ IDEA.
  User: mycom
  Date: 2018/4/2
  Time: 9:55
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>文件上传</title>
</head>
<body>
<h1>文件上传</h1>
<form action="/second" method="post" enctype="multipart/form-data">
    文件1 :<input type="file" name="upload"/>
    <input type="submit" value="提交">
</form>
</body>
</html>

在控制器类中

package demo19Fileupload.Fileupload01;

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

import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;

/**
 * Created by mycom on 2018/4/2.
 */
@Controller
public class FirstController {
    @RequestMapping("/first")
    public String doFirst(MultipartFile upload, HttpSession session){
        //upload就是客户端浏览器上传的文件对象
        //获得文件名+后缀名
        String childPath=upload.getOriginalFilename();
        System.out.println("childPath:"+childPath);
        //绝对路径
        //左半部分
        String parentPath=session.getServletContext().getRealPath("/upload");
        //创建一个file对象
        File file=new File(parentPath,childPath);
        try {
            //将文件传送到你指定的文件目录中
            upload.transferTo(file);
        } catch (IOException e) {
            e.printStackTrace();
            return "fileupload";
        }
        return "success";
    }
}

配置文件中

<?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/beans http://www.springframework.org/schema/beans/spring-beans.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="demo19Fileupload.Fileupload02"></context:component-scan>

    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/fileupload/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

<!--主要是这个  配置一个多文件解析器-->

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"></bean> 
<!--注解驱动--> 
<mvc:annotation-driven></mvc:annotation-driven> </beans>

不要忘记修改web.xml

还需要注意的是：在你的webapps下先创建一个文件夹。文件夹中最好放一个文件或者空文件，运行完成功之后，要看你编译后的文件，应该在你的target中项目下查找

二。多文件上传

页面上

<%--
  Created by IntelliJ IDEA.
  User: mycom
  Date: 2018/4/2
  Time: 9:55
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>文件上传</title>
</head>
<body>
<h1>文件上传</h1>
<form action="/second" method="post" enctype="multipart/form-data">
    文件1 :<input type="file" name="upload"/>
    文件2 :<input type="file" name="upload"/>
    文件3 :<input type="file" name="upload"/>
    <input type="submit" value="提交">
</form>
</body>
</html>

控制器中的方法

@RequestMapping("/second")
    public String doSecond(@RequestParam MultipartFile[] upload, HttpSession session){
        for (MultipartFile item:upload) {
            if(item.getSize()>0){//如果大于0，那么就说明有文件，就执行文件上传的代码，＜0就没有文件
                //获得短路径
                String childPath=item.getOriginalFilename();
                //获得左半部分
                String parentPath=session.getServletContext().getRealPath("/upload");
                //创建一个File
                File file=new File(parentPath,childPath);
                try {
                    item.transferTo(file);
                } catch (IOException e) {
                    e.printStackTrace();
                    return "fileupload";
                }
            }else{
                return "fileupload";
            }
        }
        return "success";
    }

传入的参数变成文件数组，然后用foreach遍历

配置文件不变

这是单个文件上传和多个文件上传