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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<%@ page import="java.io.*,java.util.*,javax.servlet.*,javax.servlet.http.*" %>
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<%@ page import="java.rmi.ServerException" %>
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<%@ page import="java.nio.charset.Charset" %>
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<%@ page import="java.nio.charset.StandardCharsets" %>
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<html>
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<head>
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<title></title>
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</head>
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<body>
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<%
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//定义上传文件的最大字节
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int MAX_SIZE = 102400 * 102400;
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//创建根路径的保存变量
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String rootPath;
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//声明文件读入类
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DataInputStream in = null;
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FileOutputStream fileOut = null;
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//取得互联网程序的绝对地址
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String realPath = request.getSession().getServletContext().getRealPath("/");
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realPath = realPath.substring(0, realPath.indexOf("\\out"));
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// out.print(realPath);
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//创建文件的保存目录
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rootPath = realPath + "\\web\\upload\\";
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//取得客户端上传的数据类型
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String contentType = request.getContentType();
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try {
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if (contentType.indexOf("multipart/form-data") >= 0) {
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//读入上传数据
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in = new DataInputStream(request.getInputStream());
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int formDataLength = request.getContentLength();
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if (formDataLength > MAX_SIZE) {
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out.print("上传的字节不可以超过" + MAX_SIZE + "字节");
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return;
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}
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//保存上传文件的数据
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byte dataBytes[] = new byte[formDataLength];
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int byteRead = 0;
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int totalBytesRead = 0;
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//上传的数据保存在byte数组里面
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while (totalBytesRead < formDataLength) {
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byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
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totalBytesRead += byteRead;
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}
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//根据byte数组创建字符串
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String file = new String(dataBytes, StandardCharsets.UTF_8);
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//取得上传数据的文件名
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String saveFile = file.substring(file.indexOf("filename=\"") + 10);
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saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
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saveFile = saveFile.substring(saveFile.lastIndexOf("\\") + 1, saveFile.indexOf("\""));
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int lastIndex = contentType.lastIndexOf("=");
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//取得数据的分隔字符串
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String boundary = contentType.substring(lastIndex + 1, contentType.length());
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//创建保存路径的文件名
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String fileName = rootPath + saveFile;
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int pos;
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pos = file.indexOf("filename = \"");
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pos = file.indexOf("\n", pos) + 1;
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pos = file.indexOf("\n", pos) + 1;
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pos = file.indexOf("\n", pos) + 1;
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int boundaryLocation = file.indexOf(boundary, pos) - 4;
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//取得文件数据的开始的位置
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int startPos = ((file.substring(0, pos)).getBytes()).length;
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int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
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File checkFile = new File(fileName);
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if (checkFile.exists()) {
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out.println("<p>" + saveFile + "文件已经存在.</p>");
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return;
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}
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//检查上传文件的目录是否存在
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File fileDir = new File(rootPath);
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if (!fileDir.exists()) {
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fileDir.mkdirs();
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}
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//创建文件的输出类
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fileOut = new FileOutputStream(fileName);
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//保存文件的数据
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fileOut.write(dataBytes, startPos, (endPos - startPos));
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fileOut.close();
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out.print("<b>文件上传成功</b>");
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} else {
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String content = request.getContentType();
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out.print("上传的文件类型是" + content + "类型的，请上传目录mutipart/form-data类型的文件");
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}
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} catch (Exception ex) {
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throw new ServerException(ex.getMessage());
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}
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%>
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</body>
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</html> |
