upfile.java

book书城源码 book书城源码

package com.yourcompany.struts.action;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UpFile {
	public String doUpFile(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		   
		
		  final long MAX_SIZE = 3 * 1024 * 1024;// 设置上传文件最大为 3M
		   // 允许上传的文件格式的列表
		  // final String[] allowedExt = new String[] { "jpg", "jpeg", "gif", "txt",
		  //   "doc", "docx", "mp3", "wma", "m4a" };
		   final String[] allowedExt = new String[] { "jpg", "jpeg"};
		   response.setContentType("text/html");
		   // 设置字符编码为UTF-8, 这样支持汉字显示
		   response.setCharacterEncoding("UTF-8");

		   // 实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
		   DiskFileItemFactory dfif = new DiskFileItemFactory();
		   dfif.setSizeThreshold(4096);// 设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
		   
		 //request.getRealPath("/")被request.getSession().getServletContext().getRealPath("/")代替
		   String  realPath = request.getSession().getServletContext().getRealPath("/");
		   System.out.println("11111111realPath==="+realPath);
		   System.out.println("11111111realPath==="+request.getRealPath("/"));
		   File temp = new File(realPath+"ImagesUploadTemp");
		   if(!temp.exists()){
			   temp.mkdir(); 
		   }
		   dfif.setRepository(new File(request.getRealPath("/")
		     + "ImagesUploadTemp"));// 设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录

		   // 用以上工厂实例化上传组件
		   ServletFileUpload sfu = new ServletFileUpload(dfif);
		   // 设置最大上传尺寸
		   sfu.setSizeMax(MAX_SIZE);

		   PrintWriter out = response.getWriter();
		   // 从request得到 所有 上传域的列表
		   List fileList = null;
		   try {
		    fileList = sfu.parseRequest(request);
		   } catch (FileUploadException e) {// 处理文件尺寸过大异常
		    if (e instanceof SizeLimitExceededException) {
//		     out.println("文件尺寸超过规定大小:" + MAX_SIZE + "字节<p />");
//		     out.println("<a href=\"http://localhost:8080/FIleUpLoad\" target=\"_top\">返回</a>");
//		     return;
		    	System.out.println("aaaaaaaaaaaaaaaaaaaaaaaaaa");
		    	
		    ////////////////////////////////////////////
		    }
		    e.printStackTrace();
		   }
		   // 没有文件上传
		   if (fileList == null || fileList.size() == 0) {
//		    out.println("请选择上传文件<p />");
//		    System.out.println("bbbbbbbbbbbbbbbbb");
//		    out.println("<a href=\"http://localhost:8080/FIleUpLoad\" target=\"_top\">返回</a>");
//		    return;
			   System.out.println("bbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
		   }
		   // 得到所有上传的文件
		   Iterator fileItr = fileList.iterator();
		   // 循环处理所有文件
		   while (fileItr.hasNext()) {
		    FileItem fileItem = null;
		    String path = null;
		    long size = 0;
		    // 得到当前文件
		    fileItem = (FileItem) fileItr.next();
		    // 忽略简单form字段而不是上传域的文件域(<input type="text" />等)
		    if (fileItem == null || fileItem.isFormField()) {
		    	String content = fileItem.getString("utf-8");
		    	String fieldName1 = fileItem.getFieldName();
				request.setAttribute(fieldName1, content);
		    // continue;
		    }else{
		    // 得到文件的完整路径
		    path = fileItem.getName();
		    if(path.trim().equals("")||path==null){
		    	continue;
		    }
		    // 得到文件的大小
		    size = fileItem.getSize();
		    System.out.println("path==="+path);
		    if ("".equals(path) || size == 0) {
//		     out.println("请选择上传文件<p />");
//		     System.out.println("cccccccccccccccccccc");
//		     out.println("<a href=\"http://localhost:8080/FIleUpLoad\" target=\"_top\">返回</a>");
//		     return;
		    	System.out.println("cccccccccccccccccccc");
		    }

		    // 得到去除路径的文件名
		    String t_name = path.substring(path.lastIndexOf("\\") + 1);
		    // 得到文件的扩展名(无扩展名时将得到全名)
		    String t_ext = t_name.substring(t_name.lastIndexOf(".") + 1);
		    // 拒绝接受规定文件格式之外的文件类型
		    int allowFlag = 0;
		    int allowedExtCount = allowedExt.length;
		    for (; allowFlag < allowedExtCount; allowFlag++) {
		     if (allowedExt[allowFlag].equals(t_ext))
		      break;
		    }
		    if (allowFlag == allowedExtCount) {
		    	String file_type = "";
		  //   out.println("请上传以下类型的文件<p />");
		     for (allowFlag = 0; allowFlag < allowedExtCount; allowFlag++)
		    //  out.println("*." + allowedExt[allowFlag]+ "&nbsp;&nbsp;&nbsp;");
		       file_type += "*." + allowedExt[allowFlag]+ ",";
		   //  out.println("<p /><a href=\"http://localhost:8080/FIleUpLoad\" target=\"_top\">返回</a>");
//		     out.println("<script language='javascript'>");
//		     out.println("alert('请上传以下类型的文件\\n"+file_type+"');");
//		     out.println("history.back();");
//		     out.println("</script>");
//		     return;
		     System.out.println("++++++++++++++++++++++++++");
		     System.out.println("dddddddddddddddddddddddddd");
		     System.out.println("++++++++++++++++++++++++++");
		     return "3";
		    }

		    long now = System.currentTimeMillis();
		    // 根据系统时间生成上传后保存的文件名
		    String prefix = String.valueOf(now);
		    // 保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
		    File ImagesUploaded = new File(request.getRealPath("/") + "ImagesUploaded/");
		    if(!ImagesUploaded.exists()){
		    	ImagesUploaded.mkdir();
		    }
		    String u_name = request.getRealPath("/") + "ImagesUploaded/"
		      + prefix + "." + t_ext;
		    try {
		     // 保存文件
		     fileItem.write(new File(u_name));
//		     out.println("文件上传成功. 已保存为: " + prefix + "." + t_ext
//		       + " &nbsp;&nbsp;文件大小: " + size + "字节<p />");
//		     out.println("<a href=\"http://localhost:8080/FIleUpLoad\" target=\"_top\">继续上传</a>");
		     System.out.println("eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
		     return "1";
		    } catch (Exception e) {
		     e.printStackTrace();
		    }
		    }
		  }
//			out.println("用户："+request.getAttribute("author")+"<br>");
//		    out.println("来自："+request.getAttribute("company")+"<br>");
		   
		   System.out.println("ffffffffffffffffffffffffffffffffffffff"+request.getAttribute("author"));
		return "1";
		}
}