这篇文章主要为大家详细介绍了java组件fileupload文件上传demo ,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
在我们的web开发中,很多的时候都需要把本机的一些文件上传到web服务器上面去。
如:一个BBS系统,当用户使用这是系统的时候,能把本机的一些图片,文档上传到服务器上面去。然后其他用户可以去下载这些文件,那么这样的话,我们可以自己编程实现文件的上传,但是更好的方式是使用一些已有的组件帮助我们实现这种上传功能。
常用的上传组件:
Apache 的 Commons FileUpload
JavaZoom的UploadBean
jspSmartUpload
FileUpload下载地址:
http://commons.apache.org/fileupload/
下载:commons-fileupload-1.2.2-bin.zip 得到:commons-fileupload-1.2.2.jar
下载:commons-io-1.4-bin.zip 得到:commons-io-1.4.jar
upload.jsp
代码;
<%@ page language="java" contentType="text/html; charset=UTF-8"%>using commons Upload to upload file 请您选择需要上传的文件
FileUploadServlet.java代码:
package com.b510.example; import java.io.File; import java.io.IOException; import java.util.*; import javax.servlet.ServletConfig; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * * @author XHW * * @date 2011-7-26 * */ public class FileUploadServlet extends HttpServlet { private static final long serialVersionUID = -7744625344830285257L; private ServletContext sc; private String savePath; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void init(ServletConfig config) { // 在web.xml中设置的一个初始化参数 savePath = config.getInitParameter("savePath"); sc = config.getServletContext(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); try { List items = upload.parseRequest(request); Iterator itr = items.iterator(); while (itr.hasNext()) { FileItem item = (FileItem) itr.next(); if (item.isFormField()) { System.out.println("表单参数名:" + item.getFieldName() + ",表单参数值:" + item.getString("UTF-8")); } else { if (item.getName() != null && !item.getName().equals("")) { System.out.println("上传文件的大小:" + item.getSize()); System.out.println("上传文件的类型:" + item.getContentType()); // item.getName()返回上传文件在客户端的完整路径名称 System.out.println("上传文件的名称:" + item.getName()); File tempFile = new File(item.getName()); //上传文件的保存路径 File file = new File(sc.getRealPath("/") + savePath, tempFile.getName()); item.write(file); request.setAttribute("upload.message", "上传文件成功!"); }else{ request.setAttribute("upload.message", "没有选择上传文件!"); } } } }catch(FileUploadException e){ e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); request.setAttribute("upload.message", "上传文件失败!"); } request.getRequestDispatcher("/uploadResult.jsp").forward(request, response); } }
uploadResult.jsp代码:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>uploadResult ${requestScope['upload.message'] } 上传文件
web.xml
代码:
This is the description of my J2EE component This is the display name of my J2EE component FileUploadServlet com.b510.example.FileUploadServlet <!--设置初始化参数-->savePath uploads FileUploadServlet /servlet/fileServlet index.jsp uploadFile.jsp
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