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

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

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

    xmlns:xsi= "http://HdhCmsTestw3.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>

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

<beans xmlns= "http://HdhCmsTestspringframework.org/schema/beans"

   xmlns:xsi= "http://HdhCmsTestw3.org/2001/xmlschema-instance"

   xmlns:context= "http://HdhCmsTestspringframework.org/schema/context"

   xmlns:mvc= "http://HdhCmsTestspringframework.org/schema/mvc"

   xsi:schemalocation="http: //HdhCmsTestspringframework.org/schema/beans

   http: //HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd

   http: //HdhCmsTestspringframework.org/schema/context

   https: //HdhCmsTestspringframework.org/schema/context/spring-context.xsd

   http: //HdhCmsTestspringframework.org/schema/mvc

   https: //HdhCmsTestspringframework.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测试数据mons测试数据monsmultipartresolver" >

   <!--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>

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测试数据mons测试数据monsmultipartfile;

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;

   }

}

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测试数据mons测试数据monsmultipartfile;

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" ;

   }

}

<%@ 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>

<!--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>