package com.itheima.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.text.DateFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;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.FileUploadBase;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;import com.itheima.util.IdGenertor;public class UploadServlet3 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setContentType("text/html;charset=UTF-8");//检测form是否是multipart/form-data类型的boolean isMultipart = ServletFileUpload.isMultipartContent(request);if(!isMultipart){throw new RuntimeException("The form‘s enctype attribute value must be multipart/form-data");}//解析请求内容DiskFileItemFactory factory = new DiskFileItemFactory();//产生FileItem的工厂factory.setRepository(new File("d:/"));//指定临时文件的存放目录ServletFileUpload sfu = new ServletFileUpload(factory);//	sfu.setFileSizeMax(3*1024*1024);//单个文件大小限制//	sfu.setSizeMax(5*1024*1024);//总文件大小List<FileItem> items = new ArrayList<FileItem>();try {items = sfu.parseRequest(request);}catch(FileUploadBase.FileSizeLimitExceededException e) {response.getWriter().write("单个文件不能超过3M");}catch(FileUploadBase.SizeLimitExceededException e) {response.getWriter().write("总文件不能超过5M");}catch (FileUploadException e) {e.printStackTrace();throw new RuntimeException("解析请求失败");}//遍历：for(FileItem item:items){//处理普通字段if(item.isFormField()){processFormField(item);}else{//处理上传字段processUploadField(item);}}}protected void processUploadField(FileItem item) {try {//	InputStream in = item.getInputStream();//找一个存放文件的位置；存放的文件名String fileName = item.getName();//上传的文件的文件名 C:\Users\wzhting\Desktop\a.txt a.txt(浏览器不同)if(fileName!=null&&!fileName.equals("")){//限定上传文件的类型if(!item.getContentType().startsWith("image")){return;}fileName = FilenameUtils.getName(fileName);fileName = IdGenertor.genGUID()+"_"+fileName;//存放路径String realPath = getServletContext().getRealPath("/WEB-INF/files");//生成一个子目录String childDirectory = genChildDirectory(realPath,fileName);File storeDirectory = new File(realPath+File.separator+childDirectory);if(!storeDirectory.exists()){storeDirectory.mkdirs();}//	OutputStream out = new FileOutputStream(new File(storeDirectory, fileName));//	//	int len = -1;//	byte b[] = new byte[1024];//	while((len=in.read(b))!=-1){//	out.write(b, 0, len);//	}//	in.close();//	out.close();//	//	item.delete();//清除临时文件item.write(new File(storeDirectory, fileName));}} catch (Exception e) {e.printStackTrace();}}private String genChildDirectory(String realPath, String fileName) {int hashCode = fileName.hashCode();int dir1 = hashCode&0xf;int dir2 = (hashCode&0xf0)>>4;String str = dir1+File.separator+dir2;File file = new File(realPath,str);if(!file.exists()){file.mkdirs();}return str;}//按照日期生成子目录private String genChildDirectory(String realPath) {Date now = new Date();DateFormat df = new SimpleDateFormat("yyyy-MM-dd");String str = df.format(now);File file = new File(realPath,str);if(!file.exists()){file.mkdirs();}return str;}protected void processFormField(FileItem item) {//打印到控制台String fieldName = item.getFieldName();String fieldValuehttp://www.mamicode.com/= "";try {fieldValue = http://www.mamicode.com/item.getString("UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}System.out.println(fieldName+"="+fieldValue);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}