内容：
编写一个页面uploadHttpOne. jsp,在页面中选择文件提交给urlPatterns 为{"/ uploadHttpOneServet "}的servlet对象(由UploadHttpOneServet类负责创建)。在Servlet中进行单个文件上传。
uploadHttpOne. jsp文件代码如下：
<%@ page language="java" contentType="text/html; charset=GBK"
pageEncoding="GBK"%>
<html>
<head>
<title>HttpServletRequest对文件上传的支持</title>
</head>
<body>
<form action="uploadHttpOneServet" method="post" enctype="multipart/form-data">
<table>
<tr>
<td>文件描述：</td>
<td><input type="text" name="filediscription"></td>
</tr>
<tr>
<td>请选择文件：</td>
<td><input type="file" name="resPath"></td>
</tr>
<tr>
<td align="right"><input type="reset" value="重填"></td>
<td><input type="submit" value="上传"></td>
</tr>
</table>
</form>
</body>
</html>UploadHttpOneServet.java文件代码如下：
package servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import util.MyUtil;
@WebServlet(name = "uploadHttpOneServet", urlPatterns = { "/uploadHttpOneServet" })
@MultipartConfig(maxFileSize = 10*1024*1024)
public class UploadHttpOneServet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
request.setCharacterEncoding("GBK");
Part part = request.getPart("resPath");
String filediscription = request.getParameter("filediscription");
out.println("输入的文件描述：" + filediscription + "<br>");
File uploadFileDir = new File(getServletContext().getRealPath("/uploadFiles"));
if(!uploadFileDir.exists()){
uploadFileDir.mkdir();
}
String oldName = MyUtil.getFileName(part);
out.println("上传文件的原始名：" + oldName + "<br>");
out.println("上传文件的大小：" + part.getSize() + "<br>");
if(oldName != null){
part.write(uploadFileDir + File.separator + oldName);
}
out.println("文件上传到：" + uploadFileDir + File.separator + oldName + "<br>");
}
}页面运行结果：
