userservlet.java

一个ajax源码

import javax.servlet.*;
import javax.servlet.http;
import java.io.*;
public class UerServlet extends HttpServlet
{
	public void service(HttpServletRequest req.HttpServletResponse res)throws IOException,ServletException
	{
		res.setContentType("text/xml;charset=utf-8");
		String method=req.getParamemeter("method");
		BeanFactory factory=new BeanFactory();
		UserDaoIf userdao=(UserDaoIf)factory.getBean("userdao");
		PrintWriter out=res.getWriter();
		if(method.equals("checkuser")){
			String userName=req.getParameter("username");
			if(userdao.checkUser(userName)){
				out.print("true");
				out.close();
			}else{
				out.print("false");
				out.close();
			}
		}else if(method.equals("finduser")){
			String userName=req.getParameter("username");
			User user=userdao.findUserByName(userName);
			if(user!=null){
				out.println("true");
				out.close();
			}else{
				out.println("false");
				out.close();
			}
		}else{
			res.sendRedirect("index.html");
		}
	}
}