servlet配置的整个过程

步骤：
1.页面

if(upForm.getForm().isValid()){  
    upForm.form.submit({
	 waitMsg : '正在上传文件,请稍候......',//提示信息
	 waitTitle : '请稍候',//标题
	 url : jutil.getRootPath()+'/nurseInfoImport.do',
	 method : 'post',
	 success : function(form, action) {  
			Ext.MessageBox.alert('提交成功', action.result.msg);  
		   }, 
	 failure:function(form,action){//加载失败的处理函数
		  Ext.Msg.alert('提示','导入失败！');
		 }
	});
}

2.web.xml

 <servlet>
    <servlet-name>nurseInfoImport</servlet-name>
    <servlet-class>com.alensic.nursing.sysmgr.NurseInfoImportServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>nurseInfoImport</servlet-name>
    <url-pattern>/nurseInfoImport.do</url-pattern>
  </servlet-mapping>

3.servlet

package com.alensic.nursing.sysmgr;

import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;
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.tomcat.util.http.fileupload.DiskFileUpload;


public class NurseInfoImportServlet extends HttpServlet {
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
		      throws ServletException, IOException {
		doPost(request, response);
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response)  
            throws IOException, ServletException {  
        try {  
            System.out.println("开始进行文件上传");  
            DiskFileUpload fu = new DiskFileUpload();  
            fu.setSizeMax(100*1024*1024); // 设置最大文件尺寸，这里是4MB  
            fu.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb  
            List fileItems = fu.parseRequest(request); // 得到所有的文件：  
            Iterator i = fileItems.iterator();  
            // 依次处理每一个文件：  
            while (i.hasNext()) {  
                FileItem fi = (FileItem) i.next();  
                String fileName = fi.getName();// 获得文件名，这个文件名包括路径：  
                ImportExcel importNurse = new ImportExcel();
                importNurse.importExcel(new FileInputStream(fileName));
            }      
        } catch (Exception e) {  
            e.printStackTrace();  
            response.getWriter().print("{success:flase,message:'失败'}");  
            // 可以跳转出错页面  
        }  
  
    }  
}

配置是否成功可以通过直接访问路径：jutil.getRootPath()+/nurseInfoImport.do