SpringMVC上传文件的三种实现方式,直接上代码吧,大伙一看便知
前台:
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<%@ 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:
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<!-- 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:
方式一:
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/* * 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" ; } |
方式二:
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/* * 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" ; } |
方式三:
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/* *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" ; } |
我们看看测试上传的时间:
第一次我用一个4M的文件:
fileName:test.rar
方法一的运行时间:14712ms
fileName:test.rar
方法二的运行时间:5ms
方法三的运行时间:4ms
第二次:我用一个50M的文件
方式一进度很慢,估计得要个5分钟
方法二的运行时间:67ms
方法三的运行时间:80ms
从测试结果我们可以看到:用springMVC自带的上传文件的方法要快的多!
对于测试二的结果:可能是方法三得挨个搜索,所以要慢点。不过一般情况下我们是方法三,因为他能提供给我们更多的方法
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/fjsnail/p/3491033.html