配置
web.xml
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<?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>
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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
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<?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>
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文件上传 controller
上传实现一
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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;
}
}
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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
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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" ;
}
}
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测试
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<%@ 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>
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依赖
核心依赖就是 commons-fileupload
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<!--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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