本实例要用的到jar包：
如果你用的是maven，pom.xml文件如下：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>springMVC_upload</groupId> <artifactId>springMVC_upload</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name /> <description /> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> <!--Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>3.2.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>3.2.1.RELEASE</version> <scope>test</scope> </dependency> <!--log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.1</version> <scope>provided</scope> </dependency> <!-- servlet --> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> <scope>provided</scope> </dependency> <!--fileUpload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.2.2</version> </dependency> <!--io --> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency> </dependencies> <build> <plugins> <plugin> <artifactId>maven-war-plugin</artifactId> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.6</source> <target>1.6</target> </configuration> </plugin> </plugins> </build> </project>
配置文件：spring_mvc.xml
<?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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <!-- 注解资源扫描包路径 --> <context:component-scan base-package="org.yzr.controller" /> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" /> <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀,在requestmapping输入的地址后自动调用该类进行视图解析 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/" /><!-- 跳转页面的前缀路径 如 /web-inf/user/ --> <property name="suffix" value=".jsp"></property><!-- 跳转页面后缀 如 helloWorld.jsp --> </bean> <!-- 上传拦截，如最大上传值及最小上传值 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- one of the properties available; the maximum file size in bytes --> <property name="maxUploadSize" value="10000000" /> </bean> </beans>
配置文件：web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <!-- Spring监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring_mvc.xml</param-value> </context-param> <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- spring mvc servlet --> <servlet> <description>spring mvc servlet</description> <servlet-name>springMvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <description>spring mvc 配置文件</description> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring_mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springMvc</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>multipartFileUpload.jsp</welcome-file> <welcome-file>oneFileUpload.jsp</welcome-file> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
文件上传与下载:FileUploadAndDownloadController.java
package org.yzr.controller;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.yzr.model.UploadFile;
/**
* 上传文件
*
* @author yizhaorong
*
*/
@Controller
public class FileUploadAndDownloadController {
/**
* 单文件上传
*
* @param request
* @param name
* @param file
* @return
*/
@RequestMapping(value = "/oneFileUpload", method = RequestMethod.POST)
public String handleFormUpload(HttpServletRequest request, @RequestParam("name") String name, @RequestParam("file") MultipartFile file) {
String dir = request.getSession().getServletContext().getRealPath("/") + "upload";
List<UploadFile> uploadFiles = new ArrayList<UploadFile>();
if (!file.isEmpty()) {
try {
String realName = this.copyFile(file.getInputStream(), dir, file.getOriginalFilename());
UploadFile u = new UploadFile();
u.setRealName(realName);
u.setName(name);
uploadFiles.add(u);
} catch (IOException e) {
e.printStackTrace();
}
}
request.setAttribute("uploadFiles", uploadFiles);
return "success";
}
/**
* 多文件上传
*
* @param request
* @param name
* @return
*/
@RequestMapping(value = "/multipartFileUpload", method = RequestMethod.POST)
public String upload2(MultipartHttpServletRequest request, @RequestParam("name") String name // 页面上的控件值
) {
List<UploadFile> uploadFiles = new ArrayList<UploadFile>();
List<MultipartFile> files = request.getFiles("file");
String dir = request.getSession().getServletContext().getRealPath("/") + "upload";
for (int i = 0; i < files.size(); i++) {
if (!files.get(i).isEmpty()) {
try {
String realName = this.copyFile(files.get(i).getInputStream(), dir, files.get(i).getOriginalFilename());
UploadFile u = new UploadFile();
u.setRealName(realName);
u.setName(files.get(i).getOriginalFilename());
uploadFiles.add(u);
} catch (IOException e) {
e.printStackTrace();
}
}
}
request.setAttribute("uploadFiles", uploadFiles);
return "success";
}
/**
* 文件下载
*
* @param response
* @param request
* @param realName
* @param name
*/
@RequestMapping("/download/{realName}/{name}")
public void download(HttpServletResponse response, HttpServletRequest request, @PathVariable String realName, @PathVariable String name) {
OutputStream os = null;
response.reset();
realName = request.getSession().getServletContext().getRealPath("/") + "upload" + File.separator + realName;
response.setHeader("Content-Disposition", "attachment; filename=" + name);
response.setContentType("application/octet-stream; charset=utf-8");
try {
os = response.getOutputStream();
os.write(FileUtils.readFileToByteArray(new File(realName)));
os.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 写文件到当前目录的upload目录中
*
* @param in
* @param fileName
* @throws IOException
*/
private String copyFile(InputStream in, String dir, String fileName) throws IOException {
fileName = fileName.substring(fileName.lastIndexOf("."));
String realName = UUID.randomUUID().toString() + fileName;
File file = new File(dir, realName);
if (!file.exists()) {
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
file.createNewFile();
}
FileUtils.copyInputStreamToFile(in, file);
return realName;
}
}
用于保存上传文件的基本属性的类:UploadFile.java
package org.yzr.model;
import java.io.Serializable;
public class UploadFile implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private String realName;
private String name;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
附件提供的是maven版的文件