Spring教程-Spring MVC文件上传示例
Spring MVC文件上传示例
Spring MVC提供了一种简单的方法来上传文件,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。
所需的Jar文件
要运行此示例,您需要加载以下jar文件:
- Spring Core jar文件
- Spring Web jar文件
- commons-fileupload.jar 和 commons-io.jar 文件
- 下载包括core、web、aop、mvc、j2ee、remoting、oxm、jdbc、orm等所有Spring的jar文件。
- 下载 commons-io.jar
- 下载 commons-fileupload.jar
Spring MVC文件上传步骤(比MVC多的步骤)
- 添加 commons-io 和 fileupload.jar 文件
- 在 spring-servlet.xml 中添加 CommonsMultipartResolver 的条目
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> - 创建提交文件的表单。方法名称必须为 "post",enctype 为 "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> 在控制器中使用 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); }
- 在JSP中显示图像。
<h1>Upload Success</h1>
Spring MVC文件上传示例
创建 images 目录
在您的项目中创建 "images" 目录,因为我们将代码编写为将所有文件保存在 "/images" 目录中。
index.jsp
<a href="uploadform">Upload Image</a>
Emp.java
package cn.javatiku;
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="cn.javatiku"></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
在这里,表单必须是 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 - javatiku</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
前往服务器控制台上打印的路径,以查看已上传的文件。
下载 Spring MVC 文件上传示例
我们在 MyEclipse IDE 中创建了此应用程序,该IDE已经提供了jar文件。如果您使用 Eclipse 或其他IDE,您需要加载Spring MVC的jar文件。