servlet3.0利用自帶的Part來實現文件上傳

時間 2019-11-16

標籤 servlet3.0 servlet 利用自帶實現文件上傳欄目 Tomcat 简体版

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servlet3.0利用自帶的Part來實現文件上傳 html

1,新建一個上傳文件的頁面upload.jsp java

<%@ 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>Insert title here</title>
</head>
<body>
upload上傳文件（servlet）<br>

<form name="fileupform" enctype="multipart/form-data" method="post" action="UploadServlet">
<input type="file" name="file">
<input type="text" id="name" name="name"/>  
<input type="submit" value="提交"/> 
</form>

</body>
</html>

2.再建一個上傳的servlet(UploadServlet) jsp

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;


/**
 * Servlet implementation class uploadServlet
 */
@WebServlet("/UploadServlet")
@MultipartConfig
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 doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("<h3>請使用post方式上傳</h3>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		Part part = request.getPart("file");
		String header = part.getHeader("content-disposition");
		String submittedFileName = part.getSubmittedFileName();
		String fileName = header.substring(header.lastIndexOf("\\")+1,header.lastIndexOf("\""));
		part.write(getServletContext().getRealPath("/upload/") + fileName);
		PrintWriter out = response.getWriter();
		out.println("head:content-disposition: " + header + "<br>");
		out.println("fileName: " +fileName + "<br>");
		out.println("submittedFileName: " + submittedFileName + "<br>");
		out.println(part.getName() + "<br>");
        out.println("此文件的大小："+part.getSize()+"<br />");
        out.println("此文件類型："+part.getContentType()+"<br />");
        out.println("文本框內容："+request.getParameter("name")+"<br />");
	}
}

3,而後運行結果出圖： post

上傳頁面： ui