JspSmart文件上傳與下載

本文轉載自查看原文 2016-11-22 14:10 6541 jsp/ 文件上傳

JspSmart 文件上傳包，放在WEB-INF/lib下

uploadForm.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
    <base href="<%=basePath%>" />
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>test</title>
    <link rel="stylesheet" href="">
</head>
<body>
    文件上傳
    <hr>
    <form action="UploadServlet" method="post" 
        enctype="multipart/form-data">
        你選擇一個文件進行上傳：
        <input type="file" name="myFile">
        <input type="submit" value="上傳">
    </form>    
    ${msg}
</body>
</html>

UploadServlet.java

package servlets;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class UploadServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        SmartUpload smartUpload = new SmartUpload();
        // 初始化
        ServletConfig config = this.getServletConfig();
        smartUpload.initialize(config, request, response);
        try {
            // 上傳文件
            smartUpload.upload();
            // 得到上傳的文件對象
            File smartFile = smartUpload.getFiles().getFile(0);
            // 保存文件
            smartFile.saveAs("C:/" + smartFile.getFileName(),
                    smartUpload.SAVE_PHYSICAL);// 保存文件到C盤根目錄
        } catch (SmartUploadException e) {
            e.printStackTrace();
        }
        String msg = "Upload Success!";
        request.setAttribute("msg", msg);
        RequestDispatcher rd = request.getRequestDispatcher("/uploadForm.jsp");
        rd.forward(request, response);
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <display-name></display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
    <servlet>
        <servlet-name>UploadServlet</servlet-name>
        <servlet-class>servlets.UploadServlet</servlet-class>
    </servlet>


    <servlet-mapping>
        <servlet-name>UploadServlet</servlet-name>
        <url-pattern>/UploadServlet</url-pattern>
    </servlet-mapping>
</web-app>

文件下載

download.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
        String filename = request.getParameter("file");
        //告訴客戶端出現下載框，並指定下載框中的文件名
        response.setHeader("Content-Disposition","attachment;filename="+filename);   
        //指定文件類型   
        response.setContentType("image/jpeg");   
        //指定文件
        RequestDispatcher rd = request.getRequestDispatcher("/FILES/" + filename);
        rd.forward(request, response);
 %>

download1.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
    <body>
        文件下載
        <hr>
        <a href="download.jsp?file=img.jpg">下載</a>
    </body>
</html>

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