SpringMVC上传文件的三种方式
<%@ 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>Insert title here</title> </head> <body> <form name="serForm" action="/SpringMVC006/fileUpload" method="post" enctype="multipart/form-data"> <h1>采用流的方式上传文件</h1> <input type="file" name="file"> <input type="submit" value="upload"/> </form> <form name="Form2" action="/SpringMVC006/fileUpload2" method="post" enctype="multipart/form-data"> <h1>采用multipart提供的file.transfer方法上传文件</h1> <input type="file" name="file"> <input type="submit" value="upload"/> </form> <form name="Form2" action="/SpringMVC006/springUpload" method="post" enctype="multipart/form-data"> <h1>使用spring mvc提供的类的方法上传文件</h1> <input type="file" name="file"> <input type="submit" value="upload"/> </form> </body> </html>
配置:
<!-- 多部分文件上传 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="104857600" /> <property name="maxInMemorySize" value="4096" /> <property name="defaultEncoding" value="UTF-8"></property> </bean>
后台:
/* * 通过流的方式上传文件 * @RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile 对象 */ @RequestMapping("fileUpload") public String fileUpload(@RequestParam("file") CommonsMultipartFile file) throws IOException { //用来检测程序运行时间 long startTime=System.currentTimeMillis(); System.out.println("fileName:"+file.getOriginalFilename()); try { //获取输出流 OutputStream os=new FileOutputStream("E:/"+new Date().getTime()+file.getOriginalFilename()); //获取输入流 CommonsMultipartFile 中可以直接得到文件的流 InputStream is=file.getInputStream(); int temp; //一个一个字节的读取并写入 while((temp=is.read())!=(-1)) { os.write(temp); } os.flush(); os.close(); is.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } long endTime=System.currentTimeMillis(); System.out.println("方法一的运行时间:"+String.valueOf(endTime-startTime)+"ms"); return "/success"; }
方法二:
/* * 采用file.Transto 来保存上传的文件 */ @RequestMapping("fileUpload2") public String fileUpload2(@RequestParam("file") CommonsMultipartFile file) throws IOException { long startTime=System.currentTimeMillis(); System.out.println("fileName:"+file.getOriginalFilename()); String path="E:/"+new Date().getTime()+file.getOriginalFilename(); File newFile=new File(path); //通过CommonsMultipartFile的方法直接写文件(注意这个时候) file.transferTo(newFile); long endTime=System.currentTimeMillis(); System.out.println("方法二的运行时间:"+String.valueOf(endTime-startTime)+"ms"); return "/success"; }
方法三:
/* *采用spring提供的上传文件的方法 */ @RequestMapping("springUpload") public String springUpload(HttpServletRequest request) throws IllegalStateException, IOException { long startTime=System.currentTimeMillis(); //将当前上下文初始化给 CommonsMutipartResolver (多部分解析器) CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver( request.getSession().getServletContext()); //检查form中是否有enctype="multipart/form-data" if(multipartResolver.isMultipart(request)) { //将request变成多部分request MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request; //获取multiRequest 中所有的文件名 Iterator iter=multiRequest.getFileNames(); while(iter.hasNext()) { //一次遍历所有文件 MultipartFile file=multiRequest.getFile(iter.next().toString()); if(file!=null) { String path="E:/springUpload"+file.getOriginalFilename(); //上传 file.transferTo(new File(path)); } } } long endTime=System.currentTimeMillis(); System.out.println("方法三的运行时间:"+String.valueOf(endTime-startTime)+"ms"); return "/success"; }