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package com.servlet;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FileUpLoad extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
//读取请求Body
byte[] body = readBody(request);
//取得所有Body内容的字符串表示
String textBody = new String(body, "ISO-8859-1");
//取得上传的文件名称
String fileName = getFileName(textBody);
//取得文件开始与结束位置
Position p = getFilePosition(request, textBody);
//输出至文件
writeTo(fileName, body, p);
}
//构造类
class Position {
int begin;
int end;
public Position(int begin, int end) {
this.begin = begin;
this.end = end;
}
}
private byte[] readBody(HttpServletRequest request) throws IOException {
//获取请求文本字节长度
int formDataLength = request.getContentLength();
//取得ServletInputStream输入流对象
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 {
//取得文件区段边界信息
String contentType = request.getContentType();
String boundaryText = contentType.substring(contentType.lastIndexOf("=") + 1, contentType.length());
//取得实际上传文件的气势与结束位置
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 requestBody) {
String fileName = requestBody.substring(requestBody.indexOf("filename=\"") + 10);
fileName = fileName.substring(0, fileName.indexOf("\n"));
fileName = fileName.substring(fileName.indexOf("\n") + 1, fileName.indexOf("\""));
return fileName;
}
private void writeTo(String fileName, byte[] body, Position p) throws IOException {
FileOutputStream fileOutputStream = new FileOutputStream("e:/workspace/" + fileName); //这里的地址改成服务器中文件夹的地址
fileOutputStream.write(body, p.begin, (p.end - p.begin));
fileOutputStream.flush();
fileOutputStream.close();
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP ‘FileUpload.jsp‘ starting page</title>
<style type="text/css">
.mylabel{
height:33px;
width: 142px;
display: block;
overflow: hidden;
background: url(image/huang_1_btn.jpg);
}
.file{
display:none;
}
#show{
width : 600px;
height: 50px;
background-color:#efef00;
font-size: 21px;
color:#00f;
font-weight: bold;
line-height: 50px;
text-align: center;
overflow: hidden;
}
#sub{
display : block;
width : 142px;
height: 33px;
background-color:#e34545;
margin-top:10px;
line-height: 33px;
text-decoration: none;
color : #fff;
}
</style>
<script type="text/javascript">
function show(value){
var $show = document.getElementById("show");
$show.innerHTML= value;
var image = document.getElementById("image");
image.src = value;
}
function sub(){
var fo = document.getElementById("form1");
fo.submit();
}
</script>
</head>
<body>
<center>
<form id="form1" action="http://localhost:8080/ServletFileUpload/servlet/FileUpLoad" method="POST" enctype="multipart/form-data">
<label class="mylabel">
<input type="file" name="image" class="file" onchange="show(this.value);"/>
</label>
</form>
<div id="show">
</div>
<a href="javascript:sub()" id="sub">上传文件</a>
</center>
</body>
</html>
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原文地址：http://www.cnblogs.com/dbqjava/p/4482267.html
