文件上传的简单方法

文件上传的简单方法：（原理性的实验）

1.

enctype="multipart/form-data" method="post">

附件:

2. public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

InputStream is = request.getInputStream(); //获得request的输入流

FileOutputStream fos = new FileOutputStream(new

File("d:/testUpload.jpg"));

byte[] b = new byte[1024];

while(is.read(b)!=-1){

fos.write(b);

}

is.close();

fos.close();

}

使用commons-fileupload组件实现的基本上传：

1.加jar包：commons-fileupload.jar, commons-io.jar

2.JSP页面中增加form:

action="uploadVideo">

3.增加servlet:

public void doPost(HttpServletRequest request, HttpServletResponse

response)

throws ServletException, IOException {

String tempDirectory = "d:/temp/"; //要在最后加上斜杠:temp/ 临时文件夹上传成功之前存放缓存的位置

String fileDirectory = "d:/video/"; //要在最后加上斜杠:temp/ 上传成功后的文件所放的目录

try {

int sizeThreshold = 1024 * 64; //写满该大小的缓存后，存入硬盘中。

File repositoryFile = new File(tempDirectory);//将未完全上传成功的信息放到指定的临时文件夹

FileItemFactory factory = new

DiskFileItemFactory(sizeThreshold, repositoryFile);

ServletFileUpload upload = new ServletFileUpload(factory);

upload.setSizeMax(500 * 1024 * 1024); // set every upload file'size less than 500M

List items = upload.parseRequest(request); //这里开始执行上传

Iterator iter = items.iterator();

while (iter.hasNext()) {

FileItem item = (FileItem) iter.next(); //FileItem就是表示一个表单域。

if(item.isFormField()){ //isFormField方法用于判断FileItem 是否代表一个普通表单域(即非file表单域)

System.out.println("***"+item.getFieldName());

}else {

// String fieldName = item.getFieldName(); //获取表单域name属性的值

// String fileName = item.getName(); //返回该文件在客户机上的文件名。e.g: e:\dianying\\video\1.wmv

// System.out.println("*****"+fieldName);

// System.out.println("*****"+fileName);

File uploadedFile = new File(fileDirectory +new

Date().getTime());

item.write(uploadedFile);

}

}

} catch (Exception e) {

e.printStackTrace();

}

}