多附件struts 1.x，以下代码由agatezone提供。
1.Jsp要用javascript
2.form必须enctype="multipart/form-data"
3.action要用form.getMultipartRequestHandler()获取文件并存储
struts2 更简单，google之。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>struts1.x upload example</title>
<script type="text/javascript">
function addFileField() {
input_filesCount = document.getElementById("filesCount");
input_filesCount.setAttribute("value", parseInt(input_filesCount.getAttribute("value")) + 1)
div_files = document.getElementById("files");
br = document.createElement("br");
file = document.createElement("input");
text = document.createTextNode("File " + input_filesCount.getAttribute("value") + " : ");
file.setAttribute("type", "file");
file.setAttribute("name", "file" + input_filesCount.getAttribute("value"));
div_files.appendChild(text);
div_files.appendChild(file);
div_files.appendChild(br);
}
</script>
</head>
<body>
<form action="upload.do" method="post" enctype="multipart/form-data">
<input id="filesCount" type="hidden" name="filesCount" value="1" />
<div id="files">
File 1 :
<input type="file" name="file1" />
<br />
</div>
<input type="button" onclick="javascript:addFileField();"
value="add a file" />
<br />
<input type="submit" />
</form>
</body>
</html>
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package cn.agatezone.example.struts1x.upload;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Hashtable;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
