据说古老了点，所以代码比较繁琐，主要用于处理文件的地方太多。
下节用SERVLET3.0的Part进行操作一下。
form.html:
<!DOCTYPE html> <html> <head> <meta http-equiv="content-type" content="text/html ;charset=UTF-8"> </head> <body> <form method="post" action="upload.do" enctype="multipart/form-data"> file: <input type="file" name="filename" value="" /><br> <input type="submit" value="Upload" name="upload" /> </form> </body> </html>
uploadServlet.java:
package cc.openhome; import java.io.DataInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class UploadServlet */ @WebServlet("/upload.do") public class UploadServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public UploadServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub byte[] body = readBody(request); String textBody = new String(body, "ISO-8859-1"); String filename = getFilename(textBody); Position p = getFilePosition(request, textBody); writeTo(filename, body, p); } class Position { int begin; int end; Position(int begin, int end) { this.begin = begin; this.end = end; } } private byte[] readBody(HttpServletRequest request) throws IOException{ int formDataLength = request.getContentLength(); DataInputStream dataStream = new DataInputStream(request.getInputStream()); byte body[] = new byte[formDataLength]; int totalBytes = 0; while (totalBytes < formDataLength) { int bytes = dataStream.read(body, totalBytes, formDataLength); totalBytes += bytes; } return body; } private Position getFilePosition(HttpServletRequest request, String textBody) throws IOException { String contentType = request.getContentType(); String boundaryText = contentType.substring( contentType.lastIndexOf("=") + 1, contentType.length()); int pos = textBody.indexOf("filename=\""); pos = textBody.indexOf("\n", pos) + 1; pos = textBody.indexOf("\n", pos) + 1; pos = textBody.indexOf("\n", pos) + 1; int boundaryLoc = textBody.indexOf(boundaryText, pos) -4; int begin = ((textBody.substring(0, pos)).getBytes("ISO-8859-1")).length; int end = ((textBody.substring(0, boundaryLoc)).getBytes("ISO-8859-1")).length; return new Position(begin, end); } private String getFilename(String reqBody) { String filename = reqBody.substring( reqBody.indexOf("filename=\"") + 10); filename = filename.substring(0, filename.indexOf("\n")); filename = filename.substring( filename.lastIndexOf("\\") + 1, filename.indexOf("\"")); return filename; } private void writeTo(String filename, byte[] body, Position p) throws FileNotFoundException, IOException { FileOutputStream fileOutputStream = new FileOutputStream("c:/workspace/" + filename); fileOutputStream.write(body, p.begin, (p.end - p.begin)); fileOutputStream.flush(); fileOutputStream.close(); } }
