ＪＳＰ上传文件代码

来源：互联网发布：统计学中观测数据定义编辑：程序博客网时间：2024/05/19 20:37

一、上传表单

<%@ page contentType="text/html;charset=gb2312" %>
<html><head><title>上传文件</title></head>
<body bgcolor="#ffffff" text="#000000">
<div align="center">
<p><b><font color="#ff6600">上传文件</font></b></p>
<FORM METHOD="POST" ACTION="tt.jsp" ENCTYPE="multipart/form-data">
<INPUT TYPE="FILE" SIZE="50"><BR>
<INPUT TYPE="SUBMIT" VALUE="Upload">
</FORM>

二、JSP上传代码

一、上传表单

二、JSP上传代码

<%@ 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(" "));
out.print("realPath="+realPath+"<br>");

//创建文件的保存目录
rootPath = realPath + "file://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>