***二进制文件上传的方法：

***在lib目录下：导入文件上传的开源架包：commons-fileupload-1.2.1.jar，commons-io-2.0.jar；

建立Servlet类：UploadServlet，实现文件上传的方法packagecom.lanqiao.javaweb;

importjava.io.File;importjava.io.FileOutputStream;importjava.io.IOException;importjava.io.InputStream;importjava.io.OutputStream;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importorg.apache.commons.fileupload.FileItem;importorg.apache.commons.fileupload.FileUploadException;importorg.apache.commons.fileupload.disk.DiskFileItemFactory;importorg.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadServlet extendsHttpServlet {private static final long serialVersionUID = 1L;public voiddoPost(HttpServletRequest request, HttpServletResponse response)throwsServletException, IOException {//1. 得到 FileItem 的集合 items//Create a factory for disk-based file items

DiskFileItemFactory factory = newDiskFileItemFactory();//FileCleaningTracker fileCleaningTracker =//FileCleanerCleanup.getFileCleaningTracker(getServletContext());//factory.setFileCleaningTracker(fileCleaningTracker);//Set factory constraints，设置文件的大小

factory.setSizeThreshold(1024 * 500);//超过该大小，就读到临时的文件里面

File tempDirectory = new File("f:\\tempDirectory");

factory.setRepository(tempDirectory);//Create a new file upload handler；上传该文件

ServletFileUpload upload = newServletFileUpload(factory);//Set overall request size constraint；设置文件总的大小

upload.setSizeMax(1024 * 1024 * 5);//Parse the request

try{//获取jsp文件里的请求，在集合中

List /*FileItem*/items =upload.parseRequest(request);//2. 遍历 items:

for(FileItem item : items) {//若是一个一般的表单域, 打印信息

if(item.isFormField()) {

String name=item.getFieldName();

String value=item.getString();

System.out.println(name+ ": " +value);

}//若是文件域则把文件保存到 d:\\files 目录下.

else{//文件名为file

String fieldName =item.getFieldName();//上传的原始的文件名

String fileName =item.getName();

//截取路径名，因为想要获取的是文件名而不是文件的路径

fileName=fileName.substring(3);

//上传的文件的类型

String contentType =item.getContentType();//上传的文件的大小

long sizeInBytes =item.getSize();

System.out.println(fieldName);

System.out.println(fileName);

System.out.println(contentType);

System.out.println(sizeInBytes);

InputStream in=item.getInputStream();byte[] buffer = new byte[1024];int len = 0;//文件上传后的 路径和文件名

fileName = "f:\\files\\" +fileName;

System.out.println(fileName);

OutputStream out= newFileOutputStream(fileName);while ((len = in.read(buffer)) != -1) {

out.write(buffer,0, len);

}

out.close();

in.close();

}

}

}catch(FileUploadException e) {

e.printStackTrace();

}

}

}

web.xml文件配置和映射：

day-14-fileupload

UploadServlet

UploadServlet

com.lanqiao.javaweb.UploadServlet

UploadServlet

/uploadServlet

upload.jsp表单：

Insert title here

File:

Desc: