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http://www.imooc.com/video/8413
4-6 FileUpload 单文件上传
mvc-dispatcher-servlet.xml中加入如下代码
<!--200*1024*1024即200M resolveLazily属性启用是为了推迟文件解析,以便捕获文件大小异常 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="209715200" /> <property name="defaultEncoding" value="UTF-8" /> <property name="resolveLazily" value="true" /> </bean>
org.springframework.web.multipart.commons.CommonsMultipartResolver在
pom.xml中引入
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>
如下图所示commons-fileupload又依赖于commons-io包,这样在编码中就不用显示的引入了。
2. 引入之后在contoller中:
@RequestMapping(value="/upload", method=RequestMethod.GET) public String showUploadPage(@RequestParam(value= "multi", required = false) Boolean multi){ if(multi != null && multi){ return "course_admin/multifile"; } return "course_admin/file"; }
JSP:
<form method="post" action="/courses/doUpload" enctype="multipart/form-data">
文件上传时必须显示指定的属性,如果没有无法完成工作。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>我不是真正的慕课网</title> <link rel="stylesheet" href="<%=request.getContextPath()%>/resources/css/main.css" type="text/css" /> </head> <body> <div align="center"> <h1>上传附件</h1> <form method="post" action="/courses/doUpload" enctype="multipart/form-data"> <input type="file" name="file"/> <input type="submit"/> </form> </div> </body> </html>
controller,doUploadFile方法
1)文件上传期待是post方式
2)MultipartFile类,是上传文件的接口
3)@RequestParam("file")使之与表单文件相关联
4) 把文件拷贝到指定位置
a.输入流:file.getInputStream()
b.保存位置和保存名指定:new File("c:\temp\imooc\", System.currentTimeMillis()+ file.getOriginalFilename()));
c.System.currentTimeMillis()为时间戳
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("c:\temp\imooc\", System.currentTimeMillis()+ file.getOriginalFilename()));
5)返回页,前后文已经通过配置设定,只指定JSP的名字即可。
return "success";
@RequestMapping(value="/doUpload", method=RequestMethod.POST) public String doUploadFile(@RequestParam("file") MultipartFile file) throws IOException{ if(!file.isEmpty()){ log.debug("Process file: {}", file.getOriginalFilename()); FileUtils.copyInputStreamToFile(file.getInputStream(), new File("c:\temp\imooc\", System.currentTimeMillis()+ file.getOriginalFilename())); } return "success"; }