1、spring-servlet.xml配置：
<!-- 处理文件上传 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="uft-8" /> <!-- 默认编码 (ISO-8859-1) --> <property name="maxInMemorySize" value="10240" /> <!-- 最大内存大小 (10240)--> <property name="uploadTempDir" value="/upload/" /> <!-- 上传后的目录名 (WebUtils#TEMP_DIR_CONTEXT_ATTRIBUTE) --> <property name="maxUploadSize" value="-1" /> <!-- 最大文件大小，-1为无限止(-1) --> </bean>
第一种方法：采用流的方式上传文件
jsp文件：
<form name="Form1" action="/spmvc/upload/file1" method="post" enctype="multipart/form-data"> <h3>采用流的方式上传文件</h3> <input type="file" name="file"> <input type="submit" value="upload" /> </form>
java文件：
@Controller @RequestMapping("upload") public class FileUploadController6 { //采用流的方式上传文件 @RequestMapping("file1") public String file1(@RequestParam("file")CommonsMultipartFile file){ //用来检测程序运行时间 long startTime=System.currentTimeMillis(); System.out.println("fileName："+file.getOriginalFilename()); String name = file.getOriginalFilename(); if(!file.isEmpty()){ try { String path = "D:/"+new Date().getTime()+"-"+name; FileOutputStream fos = new FileOutputStream(new File(path)); InputStream is = file.getInputStream(); int temp; byte[] b = new byte[1024]; while((temp = is.read(b))!=-1){ fos.write(b); } fos.flush(); fos.close(); is.close(); long endTime=System.currentTimeMillis(); System.out.println("方法一的运行时间："+String.valueOf(endTime-startTime)+"ms"); return "/6-upload/upload-success"; } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } return "/6-upload/upload-error"; } }
运行时间：
fileName：java_ee_javadocs.zip
方法一的运行时间：128ms
第二种方法：采用multipart提供的file.transfer方法上传文件
jsp文件：
<form name="Form2" action="/spmvc/upload/file2" method="post" enctype="multipart/form-data"> <h3>采用multipart提供的file.transfer方法上传文件</h3> <input type="file" name="file"> <input type="submit" value="upload" /> </form>
java文件：
@Controller @RequestMapping("upload") public class FileUploadController6 { //采用multipart提供的file.transfer方法上传文件 @RequestMapping("file2") public String file2(@RequestParam("file") CommonsMultipartFile file){ long startTime = System.currentTimeMillis(); System.out.println("fileName:"+file.getOriginalFilename()); String path = "D:/"+new Date().getTime()+"-"+file.getOriginalFilename(); File newFile = new File(path); try { file.transferTo(newFile); long endTime = System.currentTimeMillis(); System.out.println("方法二的运行时间："+String.valueOf(endTime-startTime)+"ms"); return "/6-upload/upload-success"; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "/6-upload/upload-error"; } }
运行时间：
fileName：java_ee_javadocs.zip
方法二的运行时间：1ms
第三种方法：使用spring mvc提供的类的方法上传文件
jsp文件：
<form name="Form3" action="/spmvc/upload/file3" method="post" enctype="multipart/form-data"> <h3>使用spring mvc提供的类的方法上传文件</h3> <input type="file" name="file"> <input type="submit" value="upload" /> </form>
java文件：
@Controller @RequestMapping("upload") public class FileUploadController6 { //使用spring mvc提供的类的方法上传文件 @RequestMapping("file3") public String file3(HttpServletRequest request){ long startTime = System.currentTimeMillis(); //将当前上下文初始化给 CommonsMutipartResolver （多部分解析器） // ServletContext c1 = request.getSession().getServletContext(); // ServletContext c2 = request.getServletContext(); // System.out.println(c1==c2);//从request和session中获取到的servletContext是同一个对象 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getServletContext()); //检查form中是否有enctype="multipart/form-data" if(multipartResolver.isMultipart(request)){ MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request; Iterator<String> iterator = multipartRequest.getFileNames(); while(iterator.hasNext()){ MultipartFile file = multipartRequest.getFile(iterator.next()); String path = "D:/"+new Date().getTime()+"-"+file.getOriginalFilename(); try { file.transferTo(new File(path)); } catch (IllegalStateException e) { e.printStackTrace(); return "/6-upload/upload-error"; } catch (IOException e) { e.printStackTrace(); return "/6-upload/upload-error"; } } } long endTime = System.currentTimeMillis(); System.out.println("方法三的运行时间："+String.valueOf(endTime-startTime)+"ms"); return "/6-upload/upload-success"; } }
运行时间：
fileName：java_ee_javadocs.zip
方法三的运行时间：1ms
一次上传多个文件
jsp文件：
<form name="Form4" action="/spmvc/upload/file3" method="post" enctype="multipart/form-data"> <h3>使用spring mvc提供的类的方法上传多个文件</h3> <input type="file" name="file1" ><br/> <input type="file" name="file2" ><br/> <input type="file" name="file3" ><br/> <input type="file" name="file4" ><br/> <input type="submit" value="upload" /> </form>
java文件：
@Controller @RequestMapping("upload") public class FileUploadController6 { //使用spring mvc提供的类的方法上传文件 @RequestMapping("file3") public String file3(HttpServletRequest request){ long startTime = System.currentTimeMillis(); //将当前上下文初始化给 CommonsMutipartResolver （多部分解析器） // ServletContext c1 = request.getSession().getServletContext(); // ServletContext c2 = request.getServletContext(); // System.out.println(c1==c2);//从request和session中获取到的servletContext是同一个对象 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getServletContext()); //检查form中是否有enctype="multipart/form-data" if(multipartResolver.isMultipart(request)){ MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest)request; Iterator<String> iterator = multipartRequest.getFileNames(); while(iterator.hasNext()){ MultipartFile file = multipartRequest.getFile(iterator.next()); String path = "D:/"+new Date().getTime()+"-"+file.getOriginalFilename(); try { file.transferTo(new File(path)); } catch (IllegalStateException e) { e.printStackTrace(); return "/6-upload/upload-error"; } catch (IOException e) { e.printStackTrace(); return "/6-upload/upload-error"; } } } long endTime = System.currentTimeMillis(); System.out.println("方法三的运行时间："+String.valueOf(endTime-startTime)+"ms"); return "/6-upload/upload-success"; } }
运行时间：
fileName：java_ee_javadocs.zip
方法三的运行时间：1ms
从上面运行的情况来看，最后采用后两种方法。