Spring MVC提供了一种上传文件的简便方法,它可以是图像或其他文件。让我们看一个使用Spring MVC上传文件的简单示例。
要运行此示例,您需要加载:
Spring Core jar文件 Spring Web jar文件 commons-fileupload.jar和commons-io.jar文件
1)下载spring的所有jar文件,包括core,web,aop,mvc,j2ee ,远程处理,oxm,jdbc,orm等。
2)下载commons-io.jar
3)下载Commons -fileupload.jar
1)添加commons-io和fileupload.jar文件
2)添加条目spring-servlet.xml中的CommonsMultipartResolver
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
3)创建表单以提交文件。方法名称必须为" post",并键入" multiple/form-data"。
<form action="savefile" method="post" enctype="multipart/form-data"> Select File: <input type="file" name="file"/> <input type="submit" value="Upload File"/> </form>
4)在Controller中使用CommonsMultipartFile类。
@RequestMapping(value="/savefile",method=RequestMethod.POST) public ModelAndView upload(@RequestParam CommonsMultipartFile file,HttpSession session){ String path=session.getServletContext().getRealPath("/"); String filename=file.getOriginalFilename(); System.out.println(path+" "+filename); try{ byte barr[]=file.getBytes(); BufferedOutputStream bout=new BufferedOutputStream( new FileOutputStream(path+"/"+filename)); bout.write(barr); bout.flush(); bout.close(); }catch(Exception e){System.out.println(e);} return new ModelAndView("upload-success","filename",path+"/"+filename); }
5)在JSP中显示图像。
<h1>Upload Success</h1> <img src="${filename}"/>
创建图像目录
在您的项目中创建"图像"目录,因为我们正在编写将所有文件保存在"/images"目录中的代码。
index.jsp
<a href="uploadform">Upload Image</a>
Emp.java
package com.nhooo; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import javax.servlet.ServletContext; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; 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.commons.CommonsMultipartFile; import org.springframework.web.servlet.ModelAndView; @Controller public class HelloController { private static final String UPLOAD_DIRECTORY ="/images"; @RequestMapping("uploadform") public ModelAndView uploadForm(){ return new ModelAndView("uploadform"); } @RequestMapping(value="savefile",method=RequestMethod.POST) public ModelAndView saveimage( @RequestParam CommonsMultipartFile file, HttpSession session) throws Exception{ ServletContext context = session.getServletContext(); String path = context.getRealPath(UPLOAD_DIRECTORY); String filename = file.getOriginalFilename(); System.out.println(path+" "+filename); byte[] bytes = file.getBytes(); BufferedOutputStream stream =new BufferedOutputStream(new FileOutputStream( new File(path + File.separator + filename))); stream.write(bytes); stream.flush(); stream.close(); return new ModelAndView("uploadform","filesuccess","File successfully saved!"); } }
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" 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_2_5.xsd"> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
spring-servlet.xml
在这里,您需要为CommonsMultipartResolver创建一个bean。
<?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"> <context:component-scan base-package="com.nhooo"></context:component-scan> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> </beans>
uploadform.jsp
此处的表单必须为method ="post"和enctype ="multipart/form-data"。
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%> <!DOCTYPE html> <html> <head> <title>Image File Upload</title> </head> <body> <h1>File Upload Example - Nhooo</h1> <h3 style="color:red">${filesuccess}</h3> <form:form method="post" action="savefile" enctype="multipart/form-data"> <p><label for="image">Choose Image</label></p> <p><input name="file" id="fileToUpload" type="file" /></p> <p><input type="submit" value="Upload"></p> </form:form> </body> </html>
输出
转到服务器控制台上打印的路径,以查看上传的文件。