1.Upload Control

①Apache的Commons FileUpload

②JavaZoom的UploadBean

③JspSmartUpload

2.Download FileUpload Commons Control

Official Website:

Download Commons IO Control

Official Website:

3.使用实例

步骤一：创建文件上传的页面：fileUpload.jsp

注意表单的 enctype 属性，这个设置很重要，详情请见：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>                
    
             上传人名:
     
     
                上传文件:
     
     
          
           
    
  

步骤二：创建处理文件上传的servlet：fileUploadServlet

package com.angelo.servlet;import java.io.File;import java.io.IOException;import java.util.Iterator;import java.util.List;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.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUploadServlet extends HttpServlet {        private ServletContext sc;    private String savePath;    private static final long serialVersionUID = 151650843430214502L;    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 servletFileUpload = new ServletFileUpload(factory);//通过工厂生成一个处理文件上传的servlet对象                try {            List items = servletFileUpload.parseRequest(request);//解析request            Iterator iterator = items.iterator();            while (iterator.hasNext()) {                FileItem item = (FileItem) iterator.next();                if(item.isFormField()){//表单的参数字段                    System.out.println("表单的参数名称："+item.getFieldName()+",表单的参数值："+item.getString("UTF-8"));                }else {                    if(item.getName()!=null && !item.getName().equals("")){//一个上传的文件                        System.out.println("文件的名称："+item.getName());                        System.out.println("文件的大小："+item.getSize());                        System.out.println("文件的类型："+item.getContentType());                                                File tempFile = new File(item.getName());//getName得到的文件名称包含了它在客户端的路径                        File file = new File(sc.getRealPath("/")+savePath,tempFile.getName());                        item.write(file);//将上传的文件写入到file中                                                request.setAttribute("message", "上传文件成功！");                    }else{                        request.setAttribute("message", "没有选择上传文件！");                    }                }            }        } catch (Exception e) {            e.printStackTrace();            request.setAttribute("message", "上传文件失败！");        }                request.getRequestDispatcher("/fileUploadResult.jsp").forward(request, response);//转向，输出结果    }    @Override    public void init(ServletConfig config) throws ServletException {        savePath = config.getInitParameter("savePath");        sc = config.getServletContext();            }    }

步骤三：修改web.xml

    
      
       
         
      
       This is the description of my J2EE component
          
      
       This is the display name of my J2EE component
          
      
       FileUploadServlet
          
      
       com.yinger.servlet.FileUploadServlet
          
       
           
       
        savePath
           
       
        uploads
           
        
       
         
      
       FileUploadServlet
          
      
       /servlet/FileUploadServlet
        
       
         
      
       index.jsp
        
     
    

同时在项目的根目录下创建文件夹 uploads （可以就在WebRoot中创建）

步骤四：创建显示上传结果的页面：fileUploadResult.jsp

<%@ page language="java" pageEncoding="UTF-8"%>            
      ${requestScope['message'] }