1。需要两个夹包文件：

commons-fileupload-1.2.1.jar、

commons-io-1.4.jar

2。页面文件上传

     
                file:
      
      
          username:
      
      
          
            
     
  

3.servlet处理页面请求；

package org.yinhe.servlet;import java.io.File;import java.io.IOException;import java.util.List;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;@SuppressWarnings("serial")public class UpLoadServlet extends HttpServlet {    @SuppressWarnings("unchecked")    public void service(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        DiskFileItemFactory factory = new DiskFileItemFactory();        ServletFileUpload upload = new ServletFileUpload(factory);        try {            FileItem item = null;            List
     
       items = upload.parseRequest(request);            for (int i = 0; i < items.size(); i++) {                item = items.get(i);                if(item.isFormField()){                    //如果是普通的控件                    String fileName = item.getFieldName();                    String username = item.getString();                    System.out.println(fileName + ":" + username);                }else{                    //如果是文件上传的控件，一般我们需要将                    //其内容转化为一个文件，并保存到服务器上面。                    //item.getName()返回的文件名:某些操作系统                    //，返回的文件名包含了路径，有一些不包含。                    String name = item.getName();                    String name2 = name.substring(name.lastIndexOf("/")+1);                    System.out.println("name:"+name2);                    //获取保存文件的路径                    //getRealPath:返回服务器的某个目录的绝对路径。                    String path = this.getServletContext().getRealPath("upload");                    System.out.println("path:" + path);                    item.write(new File(path+"/" + name2));                }            }        } catch (Exception e) {            throw new ServletException(e.getMessage());        }        response.sendRedirect("sucess.jsp");    }}
     

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