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<%@ page language="java" contentType="text/html;charset=utf-8" pageEncoding="utf-8" %>
<%@ taglib uri="/struts-tags" prefix="s" %>
<! 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>Servlet3 File Upload </title>
</head>
<body>
<center>
<form action="upload" id="form1" name="form1" method="post"
enctype="multipart/form-data">
上传文件:<input type="file" name="file" /><br/>
请求参数:<input type="text" name="wawa" /><br/>
<input name="dd" type="submit" value="提交" />
</form>
</center>
</body>
</html>
后台servlet
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
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;
/**
* Servlet implementation class UploadServlet
*/
@WebServlet("/upload")
@MultipartConfig //必须有@MultipartConfig 注解
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public UploadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
// 设置解析请求参数所用的字符集
request.setCharacterEncoding("GBK");
PrintWriter out = response.getWriter();
String wawa = request.getParameter("wawa");
out.println("wawa 请求参数为: " + wawa + "<br/>");
// 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("上传文件的类型为:" + part.getContentType() + "<br/>");
// 获取上传文件大小
out.println("上传文件大小为:" + part.getSize() + "<br/>");
// 获取该文件上传域的Header Name
Collection<String> headerNames = part.getHeaderNames();
for (String headerName : headerNames) {
out.println(headerName + " ----> " + part.getHeader(headerName) + "<br/>");
}
// content-disposition 头信息
String contentDisposition = part.getHeader("content-disposition");
// 截取上传文件的文件名
String rawFileName = contentDisposition.substring(
contentDisposition.indexOf("filename=") + 10, contentDisposition.length() -1);
// 将上传的文件写入服务器
part.write(getServletContext().getRealPath("/") + File.separatorChar + rawFileName);
}
}
/**
* Servlet implementation class UploadServlet
*/
@WebServlet("/upload")
@MultipartConfig //必须有@MultipartConfig 注解
public class UploadServlet extends HttpServlet {
@WebServlet("/upload")
@MultipartConfig
这两个注解,重点是@WebServlet("/upload"),就可以让jsp中的action中的upload找到这个servlet了
楼主百度下 servlet3.0 的注解特性