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">
<!--注册dispatcherservlet-->
<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">
<!--配置自动扫描controller包-->
<context:component-scan base-package="com.pro.controller"/>
<!--配置静态资源过滤-->
<mvc:default-servlet-handler/>
<!--配置注解驱动-->
<mvc:annotation-driven/>
<!--配置视图解析器-->
<bean id="internalresourceviewresolver" class="org.springframework.web.servlet.view.internalresourceviewresolver">
<!--前缀-->
<property name="prefix" value="/web-inf/jsp/"/>
<!--后缀-->
<property name="suffix" value=".jsp"/>
</bean>
<!--springmvc文件上传配置-->
<bean id="multipartresolver" class="org.springframework.web.multipart.commons.commonsmultipartresolver">
<!--设置请求的编码格式, 必须和pageencoding的属性一致, 以便正确读取表单的值, 默认为iso-8859-1-->
<property name="defaultencoding" value="utf-8"/>
<!--上传文件的大小限制, 单位为字节 (10485760 = 10m)-->
<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;
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
<!--导入依赖-->
<dependencies>
<!--单元测试-->
<dependency>
<groupid>junit</groupid>
<artifactid>junit</artifactid>
<version>4.13</version>
</dependency>
<!--spring-->
<dependency>
<groupid>org.springframework</groupid>
<artifactid>spring-webmvc</artifactid>
<version>5.2.0.release</version>
</dependency>
<!--文件上传-->
<dependency>
<groupid>commons-fileupload</groupid>
<artifactid>commons-fileupload</artifactid>
<version>1.3.3</version>
</dependency>
<!--servlet-api导入高版本的-->
<dependency>
<groupid>javax.servlet</groupid>
<artifactid>javax.servlet-api</artifactid>
<version>4.0.1</version>
</dependency>
<!--jsp-->
<dependency>
<groupid>javax.servlet.jsp</groupid>
<artifactid>jsp-api</artifactid>
<version>2.2</version>
</dependency>
<!--jstl表达式-->
<dependency>
<groupid>javax.servlet</groupid>
<artifactid>jstl</artifactid>
<version>1.2</version>
</dependency>
</dependencies>
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