servlet3.0处理文件上传

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前端：

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
   "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
   <title> 文件上传 </title>
   <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<form method="post" action="upload" enctype="multipart/form-data">
   文件名：<input type="text" id="name" name="name" /><br/>
   选择文件：<input type="file" id="file" name="file" /><br/>
   <input type="submit" value="上传" /><br/>
</form>
</body>
</html>

package lee;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;

import java.io.*;
import java.util.*;

@WebServlet(name="upload" , urlPatterns={"/upload"})
@MultipartConfig
public class UploadServlet extends HttpServlet
{
   public void service(HttpServletRequest request ,
       HttpServletResponse response)
       throws IOException , ServletException
   {
       response.setContentType("text/html;charset=GBK");
       PrintWriter out = response.getWriter();
       //获取普通请求参数
       String fileName = request.getParameter("name");
       //获取文件上传域
       Part part = request.getPart("file");
       //获取上传文件的文件类型
       out.println("上传文件的的类型为："
           + part.getContentType() + "<br/>");
       //获取上传文件的大小。
       out.println("上传文件的的大小为："
           + part.getSize() + "<br/>");
       //获取该文件上传域的Header Name
       Collection<String> headerNames = part.getHeaderNames();
       //遍历文件上传域的Header Name、Value
       for (String headerName : headerNames)
       {
           out.println(headerName + "--->"
               + part.getHeader(headerName) + "<br/>");
       }
       //将上传的文件写入服务器
       part.write(getServletContext().getRealPath("/uploadFiles")
           + "/" + fileName );
   }
}

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