以下示例说明如何在使用Spring Web MVC框架的表单中使用文件上载控件.首先,让我们使用一个可用的Eclipse IDE,并遵循以下步骤,使用Spring Web Framework开发基于动态表单的Web应用程序.
Step | 描述 |
---|---|
1 | 在com.it1352包下创建一个名为HelloWeb的项目,如Spring MVC - Hello World章. |
2 | 在com.it1352包下创建Java类FileModel,FileUploadController. |
3 | 在jsp子文件夹下创建视图文件fileUpload.jsp,success.jsp. |
4 | 在WebContent子文件夹下创建文件夹 temp . |
5 | 下载Apache Commons FileUpload库 commons-fileupload.jar 和Apache Commons IO库commons-io.jar .把它们放在你的CLASSPATH中. |
6 | 最后一步是创建源文件和配置文件的内容并导出应用程序,如下所述. |
package com.it1352; import org.springframework.web.multipart.MultipartFile; public class FileModel { private MultipartFile file; public MultipartFile getFile() { return file; } public void setFile(MultipartFile file) { this.file = file; } }
package com.it1352; import java.io.File; import java.io.IOException; import javax.servlet.ServletContext; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.util.FileCopyUtils; import org.springframework.validation.BindingResult; import org.springframework.validation.annotation.Validated; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.servlet.ModelAndView; @Controller public class FileUploadController { @Autowired ServletContext context; @RequestMapping(value = "/fileUploadPage", method = RequestMethod.GET) public ModelAndView fileUploadPage() { FileModel file = new FileModel(); ModelAndView modelAndView = new ModelAndView("fileUpload", "command", file); return modelAndView; } @RequestMapping(value="/fileUploadPage", method = RequestMethod.POST) public String fileUpload(@Validated FileModel file, BindingResult result, ModelMap model) throws IOException { if (result.hasErrors()) { System.out.println("validation errors"); return "fileUploadPage"; } else { System.out.println("Fetching file"); MultipartFile multipartFile = file.getFile(); String uploadPath = context.getRealPath("") + File.separator + "temp" + File.separator; //Now do something with file... FileCopyUtils.copy(file.getFile().getBytes(), new File(uploadPath+file.getFile().getOriginalFilename())); String fileName = multipartFile.getOriginalFilename(); model.addAttribute("fileName", fileName); return "success"; } } }
<beans xmlns = "http://www.springframework.org/schema/beans" xmlns:context = "http://www.springframework.org/schema/context" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" 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.IT屋" /> <bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name = "prefix" value = "/WEB-INF/jsp/" /> <property name = "suffix" value = ".jsp" /> </bean> <bean id = "multipartResolver" class = "org.springframework.web.multipart.commons.CommonsMultipartResolver" /> </beans>
这里,对于第一个服务方法 fileUploadPage(),我们传递了一个空白 FileModel 对象在名为"command"的ModelAndView对象中,因为spring框架需要名为"command"的对象,如果您使用的是< form:form> JSP文件中的标记.因此,当调用 fileUploadPage()方法时,它返回 fileUpload.jsp 视图.
第二种服务方法 fileUpload将对 HelloWeb/fileUploadPage URL上的POST方法调用().您将根据提交的信息准备要上载的文件.最后,将从service方法返回一个"成功"视图,这将导致呈现success.jsp.
<%@ page contentType="text/html; charset = UTF-8" %> <%@ taglib prefix = "form" uri = "http://www.springframework.org/tags/form"%> <html> <head> <title>File Upload Example</title> </head> <body> <form:form method = "POST" modelAttribute = "fileUpload" enctype = "multipart/form-data"> Please select a file to upload : <input type = "file" name = "file" /> <input type = "submit" value = "upload" /> </form:form> </body> </html>
这里,我们使用带有value ="fileUpload"的 modelAttribute 属性来将文件上传控件映射到服务器模型.
<%@ page contentType = "text/html; charset = UTF-8" %> <html> <head> <title>File Upload Example</title> </head> <body> FileName : lt;b> ${fileName} </b> - Uploaded Successfully. </body> </html>
完成创建源文件和配置文件后,导出应用程序.右键单击您的应用程序,使用 Export → WAR文件选项并将HelloWeb.war文件保存在Tomcat的webapps文件夹中.
现在,启动Tomcat服务器并确保您能够从webapps访问其他网页使用标准浏览器的文件夹.尝试使用URL- http://localhost:8080/HelloWeb/fileUploadPage ,如果Spring Web Application的一切正常,我们将看到以下屏幕.
提交所需信息后,单击"提交"按钮提交表单.如果Spring Web Application的一切正常,您应该看到以下屏幕.