springmvc三種上傳方式對比:
前端頁面:
<form action="${pageContext.request.contextPath}/Upload/fileUpload1.action" method="post" enctype="multipart/form-data">
文件:<input type="file" name="file">
<input type="submit" value="提交方法一">
</form>
<form action="${pageContext.request.contextPath}/Upload/fileUpload2.action" method="post" enctype="multipart/form-data">
文件:<input type="file" name="file1">
<input type="submit" value="提交方法二">
</form>
<form action="${pageContext.request.contextPath}/Upload/springUpload.action" method="post" enctype="multipart/form-data">
文件:<input type="file" name="file">
<input type="submit" value="提交方法三">
配置都是一樣的:
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="UTF-8"/>
<property name="maxUploadSize" value="10485760000"></property>
<property name="maxInMemorySize" value="40960"></property>
<property name="uploadTempDir" value="fileUpload"></property>
</bean>
方法一(通過流的方式上傳文件):
通過流的方式上傳文件
@RequestParam(“file”) 將name=file控件得到的文件封裝成CommonsMultipartFile 對象
@RequestMapping("fileUpload1")
public String fileUpload(@RequestParam("file") CommonsMultipartFile file,HttpServletRequest request) throws IOException {
//用來檢測程序運行時間
long startTime=System.currentTimeMillis();
System.out.println("fileName:"+file.getOriginalFilename());
try {
//獲取輸出流
OutputStream os=new FileOutputStream(request.getSession().getServletContext().getRealPath("/") + "fileUpload/"+file.getOriginalFilename());
//獲取輸入流 CommonsMultipartFile 中可以直接得到文件的流
InputStream is=file.getInputStream();
int temp;
//一個一個字節的讀取並寫入
while((temp=is.read())!=(-1))
{
os.write(temp);
}
os.flush();
os.close();
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
long endTime=System.currentTimeMillis();
System.out.println("方法一的運行時間:"+String.valueOf(endTime-startTime)+"ms");
return "/return.jsp";
}
方法二:
採用file.Transto 來保存上傳的文件
@RequestMapping("fileUpload2")
public ModelAndView importExcel(@RequestParam("file1") MultipartFile file, HttpServletRequest request){
long startTime=System.currentTimeMillis();
ModelAndView modelAndView = new ModelAndView();
// 判斷文件是否爲空
if (!file.isEmpty()) {
// 文件保存路徑
String filePath = request.getSession().getServletContext().getRealPath("/") + "fileUpload/"
+ file.getOriginalFilename();
// 轉存文件
try {
file.transferTo(new File(filePath));
modelAndView.setViewName("/return.jsp");
modelAndView.addObject("result", file.getOriginalFilename()+"上傳成功");
} catch (Exception e) {
modelAndView.addObject("result", file.getOriginalFilename()+"上傳失敗");
e.printStackTrace();
}
}
long endTime=System.currentTimeMillis();
System.out.println("方法二的運行時間:"+String.valueOf(endTime-startTime)+"ms");
return modelAndView;
}
方法三:
使用spring mvc提供的類的方法上傳文件
@RequestMapping("springUpload")
public ModelAndView springUpload(HttpServletRequest request) throws IllegalStateException, IOException
{
ModelAndView modelAndView = new ModelAndView();
long startTime=System.currentTimeMillis();
//將當前上下文初始化給 CommonsMutipartResolver (多部分解析器)
CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver(
request.getSession().getServletContext());
//檢查form中是否有enctype="multipart/form-data"
if(multipartResolver.isMultipart(request))
{
//將request變成多部分request
MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
//獲取multiRequest 中所有的文件名
Iterator iter=multiRequest.getFileNames();
while(iter.hasNext())
{
//一次遍歷所有文件
MultipartFile file=multiRequest.getFile(iter.next().toString());
if(file!=null)
{
String path=request.getSession().getServletContext().getRealPath("/") + "fileUpload/"+file.getOriginalFilename();
//上傳
file.transferTo(new File(path));
modelAndView.addObject("result", file.getOriginalFilename()+"上傳成功");
}
}
}
long endTime=System.currentTimeMillis();
System.out.println("方法三的運行時間:"+String.valueOf(endTime-startTime)+"ms");
modelAndView.setViewName("/return.jsp");
return modelAndView;
}
第一種通過流的方式上傳文件太慢,儘量使用第二或第三種方式。