JavaEE 文件上传代码

JavaEE 文件上传代码示例

package com.hello.web.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FilenameUtils;

public class FileUploadServlet extends HttpServlet {

	public void doGet（HttpServletRequest request HttpServletResponse response）
			throws ServletException IOException {
		if（ServletFileUpload.isMultipartContent（request））{
			// Create a factory for disk-based file items
			DiskFileItemFactory factory=new DiskFileItemFactory（）;
			// Create a new file upload handler
			ServletFileUpload upload=new ServletFileUpload（factory）;
			// 一个request里面的文件上传总共10M，还有一个是限制单个文件大小的，这是总文件大小。
			upload.setSizeMax（1024*1024*10）;
			try {
				List items=upload.parseRequest（request）; 
				for（FileItem item : items）{
					if（item.isFormField（））{
						// 普通表单
						System.out.println（item.getFieldName（）+“:“+item.getString（））;
					}else{
						// 文件表单
						System.out.println（item.getFieldName（）+“:“+item.getName（）+“:“+item.getSize（）+“:“+item.getContentType（））;
						// 在用户无法访问的meta-INF里创建专门放文件的目录
						SimpleDateFormat sdf=new SimpleDateFormat（“yyyyMMdd“）;
						String d=sdf.format（new Date（））;
						String year=d.substring（0 4）;
						String month=d.substring（4 6）;
						String day=d.substring（6）;
						String path=this.getServletContext（）.getRealPath（“/WEB-INF/upload“+File.separator+year+File.separator+month+File.separator+day）;
						File directory=new File（path）;
						if（!directory.exists（））{
							directory.mkdirs（）;
						}
						String filename=item.getName（）;
						if（filename!=null）{
							filename=FilenameUtils.getName（filename）;
						}
						filename=UUID.randomUUID（）+filename;
						File file=new File（directoryfilename）;
						// 获得输入流
						InputStream is=item.getInputStream（）;
						FileOutputStream fos=new FileOutputStream（file）;
						int len=0;
						byte[] b=new byte[1024];
						while（（len=is.read（b））!=-1）{
							fos.write（b 0 len）;
						}
					}
				}
			} catch （FileUploadException e） {
				e.printStackTrace（）;
			}
		}
	}

	public void doPost（HttpServletRequest request HttpServletResponse response）
			throws ServletException IOException {
		doGet（request response）;
	}

}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2016-09-26 09:27  Day01_FileUpload\
     文件         529  2016-09-26 09:27  Day01_FileUpload\.classpath
     目录           0  2016-09-26 13:52  Day01_FileUpload\.myeclipse\
     文件         321  2016-09-26 09:27  Day01_FileUpload\.mymetadata
     文件        1759  2016-09-26 09:32  Day01_FileUpload\.project
     目录           0  2016-09-26 09:27  Day01_FileUpload\.settings\
     文件         500  2016-09-26 09:27  Day01_FileUpload\.settings\.jsdtscope
     文件         395  2016-09-26 09:27  Day01_FileUpload\.settings\org.eclipse.jdt.core.prefs
     文件         486  2016-09-26 09:27  Day01_FileUpload\.settings\org.eclipse.wst.common.component
     文件         252  2016-09-26 09:27  Day01_FileUpload\.settings\org.eclipse.wst.common.project.facet.core.xml
     文件          49  2016-09-26 09:27  Day01_FileUpload\.settings\org.eclipse.wst.jsdt.ui.superType.container
     文件           6  2016-09-26 09:27  Day01_FileUpload\.settings\org.eclipse.wst.jsdt.ui.superType.name
     目录           0  2016-09-26 09:27  Day01_FileUpload\WebRoot\
     目录           0  2016-09-26 09:27  Day01_FileUpload\WebRoot\meta-INF\
     文件          36  2016-09-26 09:27  Day01_FileUpload\WebRoot\meta-INF\MANIFEST.MF
     目录           0  2016-09-26 09:27  Day01_FileUpload\WebRoot\WEB-INF\
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\classes\
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\classes\com\
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\classes\com\hello\
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\classes\com\hello\web\
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\classes\com\hello\web\servlet\
     文件        4317  2016-09-26 13:40  Day01_FileUpload\WebRoot\WEB-INF\classes\com\hello\web\servlet\FileUploadServlet.class
     目录           0  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\lib\
     文件       59590  2016-09-26 09:34  Day01_FileUpload\WebRoot\WEB-INF\lib\commons-fileupload-1.2.2.jar
     文件      173587  2016-09-26 09:28  Day01_FileUpload\WebRoot\WEB-INF\lib\commons-io-2.2.jar
     文件         715  2016-09-26 09:29  Day01_FileUpload\WebRoot\WEB-INF\web.xml
     文件        1095  2016-09-26 09:32  Day01_FileUpload\WebRoot\index.jsp
     目录           0  2016-09-26 09:29  Day01_FileUpload\src\
     目录           0  2016-09-26 09:29  Day01_FileUpload\src\com\
     目录           0  2016-09-26 09:29  Day01_FileUpload\src\com\hello\
     目录           0  2016-09-26 09:29  Day01_FileUpload\src\com\hello\web\
............此处省略2个文件信息