Spring MVC文件上传示例
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。
必需的Jar文件
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
Spring MVC文件上传步骤(不包括MVC)
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}"/>
Spring MVC文件上传示例
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>
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>
