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锁定老帖子 主题：简单文件上传
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发表时间：2008-02-29
尽供学习使用
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发表时间：2008-03-27
本人自己用java写的一个文件上传组件，欢迎大家使用和交流。
下面是如何使用代码： //--------------uploadFile.html------------------
<!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>upload file </title>
</head>
<body>
<form method="post" encType="multipart/form-data" action="servlet/UploadFile">
<table>
<tr><td>你的姓名是：</td><td><input type="text" name="name" /></td></tr>
<tr><td>你的学号是：</td><td><input type="text" name="number" /></td></tr>
<tr><td>你的兴趣是：</td><td><input type="checkbox" name="interest" value="reading"/>reading
<input type="checkbox" name="interest" value="skating"/>skating
<input type="checkbox" name="interest" value="go shopping"/>go shopping</td></tr>
<tr><td>你要上传的文件是：</td><td><input type="file" name="file1" /></td></tr>
<tr><td>你要上传的文件是：</td><td><input type="file" name="file1" /></td></tr>
<tr><td><input type="submit" value="submit" /></td></tr>
</table>
</form>
</body>
</html>
//------------------UploadFile.java (servlet)------------------------
package servlet;
import org.sklse.upload.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class UploadFile extends HttpServlet {
/**
* Constructor of the object.
*/
public UploadFile() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
// ---------------------deal with the upload file -------------------------------
try
{
MultipartRequest parameters=new MultipartRequest(request,"UTF-8");
// deal with name/value
Enumeration textNames=parameters.getParameterNames();
out.println("<table>");
String value;
String[] values;
while(textNames.hasMoreElements())
{
String name=(String)textNames.nextElement();
Object object=parameters.getParameter(name);
if(object instanceof String)
{
value=(String)object;
out.println("<tr><td>"+name+"=</td><td>"+value+"</td></tr>");
}
else if(object==null)
{
object=parameters.getParameterValues(name);
values=(String[])object;
out.println("<tr><td>"+name+"=</td><td>");
for(int i=0;i<values.length;i++)
out.println(values[i]+" ");
out.println("</td></tr>");
}
}
out.println("</table>");
//deal with name/file
FileHolder[] fileHolders=parameters.getFileParameterValues("file1");
for(int i=0;i<fileHolders.length;i++)
{
out.println("<br><hr width='50%' align='left'>");
FileHolder fileHolder=fileHolders[i];
if(!fileHolder.getFileName().equals(""))
fileHolder.saveTo("/pictures/");
out.println("fileName="+fileHolder.getFileName()+"<br>");
//out.println("fileParameterName="+fileHolder.getParameterName()+"<br>");
out.println("clientFilePath="+fileHolder.getClientFilePath()+"<br>");
out.println("contentType="+fileHolder.getContentType()+"<br>");
}
}
catch(MultipartRequestException cfe)
{
out.println(cfe.getMessage());
}
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}
//----------------------------------------------------
组件实现原理及源代码详单见（http://adorechen.blog.163.com）
//-----------------------------------------------------
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