Common FileUpload组件的使用

转载自/content/3717211.html

文件上传功能组件Common FileUpload。

需要两个Jar包分别是commons-io-1.4.jar，commons-fileupload-1.2.1.jar。点击下载

只需要写一个上传类UploadServlet.java，还需要两个Jsp界面，分别负责上传文件和输出上传是否成功。

还需要在根目录下新建一个文件夹uploads，用于保存上传后文件。

下面是上传Servlet类源码：

package com.sy.web;

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;

import org.apache.commons.fileupload.*;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadServlet extends HttpServlet {

private static final long serialVersionUID = -2201219701121037194L;

private String savePath;

private ServletContext sc;

public void init(ServletConfig config) {

savePath = config.getInitParameter("savePath");

sc = config.getServletContext();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request, response);

}

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);// 上传文件解析

Iterator itr = items.iterator();// 枚举方法

while (itr.hasNext()) {

FileItem item = (FileItem) itr.next();

if (item.isFormField()) {// 判断是文件还是文本信息

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("")) {// 判断是否选择了文件

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());

// 此时文件暂存在服务器的内存当中

File tempFile = new File(item.getName());// 构造临时对象

File file = new File(sc.getRealPath("/") + savePath,

tempFile.getName());

// 获取根目录对应的真实物理路径

item.write(file);// 保存文件在服务器的物理磁盘中

request.setAttribute("upload.message", "上传文件成功！");// 返回上传结果

} else {

request.setAttribute("upload.message", "没有选择上传文件！");

}

}

}

} catch (Exception e) {

e.printStackTrace();

request.setAttribute("upload.message", "上传文件失败！");

}

request.getRequestDispatcher("/uploadResult.jsp").forward(request,

response);

}

}