jsp页面文件上传

<%@ page contentType="text/html; charset=utf-8" %>
< %@ page import="java.io.*"%>
< %@ page import="java.util.*"%>
< %@ page import="java.text.SimpleDateFormat"%>
< meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
< %
int MAX_SIZE = 1024 * 1024 * 1;

String rootPath = request.getRealPath("/") + "/upload/";
String contentType=request.getContentType();

try{
if(contentType.indexOf("multipart/form-data") >= 0){

DataInputStream in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
if(formDataLength > MAX_SIZE){
out.println("<script>alert('上传的文件字节数不可以超过" + MAX_SIZE + "');window.history.go(-1);</script>");
return;
}
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while(totalBytesRead < formDataLength){
byteRead = in.read(dataBytes,totalBytesRead,formDataLength);
totalBytesRead += byteRead;
}
String file = new String(dataBytes);
String oldFileName = file.substring(file.indexOf("filename=\"") + 10);
oldFileName = oldFileName.substring(0,oldFileName.indexOf("\n"));
oldFileName = oldFileName.substring(oldFileName.lastIndexOf("/") + 1,oldFileName.indexOf("\""));
String sExt = oldFileName.substring(oldFileName.lastIndexOf("."),oldFileName.length());

java.util.Date dt = new java.util.Date(System.currentTimeMillis());
SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String nenFileName= fmt.format(dt) + sExt;
String fileName = rootPath + nenFileName;

int lastIndex = contentType.lastIndexOf("=");
String boundary = contentType.substring(lastIndex + 1,contentType.length());

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;
int startPos = ((file.substring(0,pos)).getBytes()).length;
int endPos = ((file.substring(0,boundaryLocation)).getBytes()).length;

File fileDir = new File(rootPath);
if(!fileDir.exists()){
fileDir.mkdirs();
}

FileOutputStream fileOut = new FileOutputStream(fileName);
fileOut.write(dataBytes,startPos,(endPos - startPos));
fileOut.close();
out.println("<script>alert('上传成功！')</script>");
}else{
String content = request.getContentType();
out.println("<p>上传的数据类型不是multipart/form-data</p>");
}
}catch(Exception ex){
throw new ServletException(ex.getMessage());
}
%>

import java.text.NumberFormat;

public class Test {
public static String numerFormat(double d) {
NumberFormat nf=NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
return nf.format(d);
}
}