checkloginnameservlet.java

oa办公系统

package cn.jx.ecjtu.oa.servlets.users;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.jx.ecjtu.oa.ps.pojo.LoginUser;
import cn.jx.ecjtu.oa.services.ServiceFactory;
import cn.jx.ecjtu.oa.services.SysUserService;

public class CheckLoginNameServlet extends HttpServlet {

	/**
	 * Ajax用Servlet，用来在添加新用户的时候动态验证用户名是否存在或为空
	 * 
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
        
		String name;
		//将异步提交的登录用户名转换编码，以防止乱码
		name=new String(request.getParameter("loginName").getBytes("ISO8859-1"),"GBK");
		PrintWriter out=response.getWriter();
		
		//判断是否为空，如果为空则提示用户名不能为空
		if(name.equals(null)!=true&&name.trim().equals("")!=true)
		{
		   
	
		    LoginUser loginuser=sus.getLoginUserInfo(name);//根据用户名查找用户信息
		    if(null!=loginuser)//如果不为空则判断用户名重复，否则判断用户名可以使用
		    {       
			      out.write("用户名重复");
		     }
		    else
		    {
		    	 out.write("该用户名可以使用");
		    }
		
		}else{
			out.write("登录用户名不能为空");
		}           
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	 private SysUserService sus=null;
	public void init() throws ServletException {
		sus=(SysUserService)ServiceFactory.getService(SysUserService.class);
	}

}