jsp文件上传

<%@ 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 + "<br>");

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

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

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

   //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("<p>客户端上传的数据类型 = " + contentType + "</p>");    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("<P>上传的文件字节数不可以超过" + MAX_SIZE + "</p>");     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("<p>" + saveFile + "文件已经存在.</p>");      }      //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("<P>" + saveFile + "文件成功上载.</p>");     } else {      String content = request.getContentType();      out.println("<p>上传的数据类型不是是multipart/form-data</p>");     }    } catch (Exception ex) {     throw new ServletException(ex.getMessage());    }   %>  </body> </html>

文章转自:http://www.128kj.com/article/article5/7ADB83463E6920B438FA8D83B3EF5814.htm?id=189

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