SpringMVC 通过commons-fileupload实现文件上传功能

配置

web.xml

<?xml version="1.0" encoding="utf-8"?>

<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"

xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"

xsi:schemalocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"

version="5.0">

<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:applicationcontext.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>

springmvc配置文件 applicationcontext.xml

上传文件的核心配置类：commonsmultipartresolver，注意id="multipartresolver"不要写错

<?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.xsd

http://www.springframework.org/schema/context

https://www.springframework.org/schema/context/spring-context.xsd

http://www.springframework.org/schema/mvc

https://www.springframework.org/schema/mvc/spring-mvc.xsd">

<context:component-scan base-package="com.pro.controller"/>

<mvc:default-servlet-handler/>

<mvc:annotation-driven/>

<bean id="internalresourceviewresolver" class="org.springframework.web.servlet.view.internalresourceviewresolver">

<property name="prefix" value="/web-inf/jsp/"/>

<property name="suffix" value=".jsp"/>

</bean>

<bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver">

<property name="defaultencoding" value="utf-8"/>

<property name="maxuploadsize" value="10485760"/>

<property name="maxinmemorysize" value="40960"/>

</bean>

</beans>

文件上传 controller

上传实现一

package com.pro.controller;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.requestparam;

import org.springframework.web.bind.annotation.restcontroller;

import org.springframework.web.multipart.commons.commonsmultipartfile;

import javax.servlet.http.httpservletrequest;

import javax.servlet.http.httpservletresponse;

import java.io.*;

import java.net.urlencoder;

import java.util.hashmap;

import java.util.map;

@restcontroller

public class filecontroller {

/*

* 采用file.transferto 来保存上传的文件

*/

@requestmapping("/upload2")

public map fileupload2(@requestparam("file") commonsmultipartfile file, httpservletrequest request) throws ioexception {

//上传路径保存设置

string path = request.getservletcontext().getrealpath("/upload");

file realpath = new file(path);

if (!realpath.exists()){

realpath.mkdir();

}

//上传文件地址

system.out.println("上传文件保存地址 --> "+realpath);

//通过commonsmultipartfile的方法直接写文件（注意这个时候）

file.transferto(new file(realpath +"/"+ file.getoriginalfilename()));

map<object, object> hashmap = new hashmap<>();

hashmap.put("code", 0);

hashmap.put("msg", "上传成功");

return hashmap;

}

上传实现二

这里的文件名称没有使用 uuid组合名称为了方便测试

package com.pro.controller;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.requestparam;

import org.springframework.web.bind.annotation.restcontroller;

import org.springframework.web.multipart.commons.commonsmultipartfile;

import javax.servlet.http.httpservletrequest;

import javax.servlet.http.httpservletresponse;

import java.io.*;

import java.net.urlencoder;

import java.util.hashmap;

import java.util.map;

@restcontroller

public class filecontroller {

// @requestparam("file") 将 name=file 控件得到的文件封装成 commonsmultipartfile 对象

// 批量上传把 commonsmultipartfile 改为数组即可

@requestmapping("/upload")

public string upload(@requestparam("file") commonsmultipartfile file, httpservletrequest request) throws ioexception {

// 获取文件名称

string uploadfilename = file.getoriginalfilename();

// 如果文件名为空, 直接返回首页

if ("".equals(uploadfilename)) {

return "file upload error";

}

system.out.println("上传文件名 --> " + uploadfilename);

// 设置文件的保存位置

string path = request.getservletcontext().getrealpath("/upload");

// 判断路径是否存在

file realpath = new file(path);

if (!realpath.exists()) {

// 如果不存在就创建

realpath.mkdir();

}

system.out.println("文件保存路径 --> " + realpath);

// 获取文件输入流

inputstream is = file.getinputstream();

// 获取文件输出流

fileoutputstream os = new fileoutputstream(new file(realpath, uploadfilename));

// 缓冲区读写文件

byte[] buffer = new byte[1024];

int len;

while ((len = is.read(buffer)) != -1) {

os.write(buffer, 0, len);

os.flush();

}

// 关闭流

os.close();

is.close();

return "file upload success";

}

测试

<%@ page contenttype="text/html;charset=utf-8" language="java" %>

<html>

<head>

<title>$title$</title>

</head>

<body>

<form enctype="multipart/form-data" action="${pagecontext.request.contextpath}/upload2" method="post">

<input type="file" name="file">

<input type="submit" value="上传实现一">

</form>

<form enctype="multipart/form-data" action="${pagecontext.request.contextpath}/upload" method="post">

<input type="file" name="file">

<input type="submit" value="上传实现二">

</form>

</body>

</html>

依赖

核心依赖就是 commons-fileupload

SpringMVC 通过commons-fileupload实现文件上传功能

配置

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