文件上传—jspSmartUpload组件

最新推荐文章于 2021-02-22 01:52:42 发布

原创最新推荐文章于 2021-02-22 01:52:42 发布 · 326 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用JSP实现的简单文件上传示例，包括前端表单设计及后端处理逻辑。通过SmartUpload组件实现了文件类型过滤及大小限制。

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1、jsp简单页面

<%@ page language="java" contentType="text/html; charset=utf-8"%>
<html>
    <head>upload文件上传</head>
    <body>
        <%-- "<%=request.getContextPath()%>/UploadServlet"--%>
        <form action="UploadDemo/UploadServlet" method="post" enctype="multipart/form-data">
        文件描述:<input type="text" name="desc" size="20" maxlength="80">
        文件名称:<input type="file" name="file" size="20" maxlength="80">
        <input type="submit" value="上传">
        </form>
    </body>
</html>

2、UploadServlet

package UploadDemo;

import java.io.IOException;
import java.io.PrintWriter;

import javax.security.auth.message.callback.SecretKeyCallback.Request;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.annotation.WebServlet;
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;

/**
 * Servlet implementation class UploadServlet
 */
public class UploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;


    protected void doPost(HttpServletRequest request, HttpServletResponse response) 
            throws ServletException, IOException {
        response.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        out.println("<html>");
        out.println("<body>");
        out.println("<hr>");
        out.println("执行......");
        SmartUpload mySmartUpload=new SmartUpload();
        int count=0;  //上传文件数量
        try{
            //初始化工作
            System.out.println("执行中-----");
            mySmartUpload.initialize(this.getServletConfig(),request,response);
            //限制文件上传最大长度
            mySmartUpload.setMaxFileSize(50*1024*1024);
            //设置文件上传的文件，仅允许doc与txt文件
            mySmartUpload.setAllowedFilesList("doc,txt");
            mySmartUpload.upload();
            //获得上传的文件
            File myfile=mySmartUpload.getFiles().getFile(0);
            //获得上传文件的名字
            String filename=myfile.getFileName();
            //保存文件的目录
            count=mySmartUpload.save("F:\\");
            //获得文件的描述信息
            Request re =(Request) mySmartUpload.getRequest();
            String desc=((ServletRequest) re).getParameter("desc");
            out.println(count+"file uploaded.<br>");
            out.println("file description:"+desc);  
        }catch(Exception e){
            out.println("Unable to upload the file!!");
            out.println("Error:"+e.toString());
        }
        out.println("</body>");
        out.println("</html>"); 
    }
}