jsp文件上传

来源：互联网发布：java图形界面设计简单编辑：程序博客网时间：2024/05/29 07:06

<%@ page contentType="text/html; charset=GBK"%><%@ page import="java.io.*"%><%@ page import="java.util.*"%><%@ page import="javax.servlet.*"%><%@ page import="javax.servlet.http.*"%><html> <head> <title>upFile</title> </head> <body bgcolor="#ffffff"> <% //定义上载文件的最大字节 int MAX_SIZE = 102400 * 102400; // 创建根路径的保存变量 String rootPath; //声明文件读入类 DataInputStream in = null; FileOutputStream fileOut = null; //取得客户端的网络地址 String remoteAddr = request.getRemoteAddr();

//获得服务器的名字 String serverName = request.getServerName(); out.print("serverName=" + serverName + " ");

//取得jsp文件相对与根地址的地址 out.print("request.getServletPath()=" + request.getServletPath() + " ");

//取得互联网程序的绝对地址 String realPath = request.getRealPath(serverName); out.println("request.getRealPath(serverName)=" + realPath + " ");

realPath = realPath.substring(0, realPath.lastIndexOf("//")); System.out.print("realPath=" + realPath + " ");

//创建文件的保存目录 rootPath = realPath + "//upload//"; out.println("文件的保存目录=" + rootPath);

//取得客户端上传的数据类型 String contentType = request.getContentType(); out.println("客户端上传的数据类型 = " + contentType + ""); try { if (contentType.indexOf("multipart/form-data") >= 0) { //读入上传的数据 in = new DataInputStream(request.getInputStream()); int formDataLength = request.getContentLength(); if (formDataLength > MAX_SIZE) { out.println("上传的文件字节数不可以超过" + MAX_SIZE + ""); return; } //保存上传文件的数据 byte dataBytes[] = new byte[formDataLength]; int byteRead = 0; int totalBytesRead = 0; //上传的数据保存在byte数组 while (totalBytesRead < formDataLength) { byteRead = in.read(dataBytes, totalBytesRead, formDataLength); totalBytesRead += byteRead; } //根据byte数组创建字符串 String file = new String(dataBytes); //out.println(file); //取得上传的数据的文件名 String saveFile = file.substring(file .indexOf("filename=/"") + 10); saveFile = saveFile.substring(0, saveFile.indexOf("/n")); saveFile = saveFile.substring( saveFile.lastIndexOf("//") + 1, saveFile .indexOf("/"")); int lastIndex = contentType.lastIndexOf("="); //取得数据的分隔字符串 String boundary = contentType.substring(lastIndex + 1, contentType.length()); //创建保存路径的文件名 String fileName = rootPath + saveFile; //out.print(fileName); int pos; pos = file.indexOf("filename=/""); pos = file.indexOf("/n", pos) + 1; pos = file.indexOf("/n", pos) + 1; pos = file.indexOf("/n", pos) + 1; int boundaryLocation = file.indexOf(boundary, pos) - 4; //out.println(boundaryLocation); //取得文件数据的开始的位置 int startPos = ((file.substring(0, pos)).getBytes()).length; //out.println(startPos); //取得文件数据的结束的位置 int endPos = ((file.substring(0, boundaryLocation)) .getBytes()).length; //out.println(endPos); //检查上载文件是否存在 File checkFile = new File(fileName); if (checkFile.exists()) { out.println("" + saveFile + "文件已经存在."); } //检查上载文件的目录是否存在 File fileDir = new File(rootPath); if (!fileDir.exists()) { fileDir.mkdirs(); } //创建文件的写出类 fileOut = new FileOutputStream(fileName); //保存文件的数据 fileOut.write(dataBytes, startPos, (endPos - startPos)); fileOut.close(); out.println("" + saveFile + "文件成功上载."); } else { String content = request.getContentType(); out.println("上传的数据类型不是是multipart/form-data"); } } catch (Exception ex) { throw new ServletException(ex.getMessage()); } %> </body></html>

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