ajaxservlet.java

交易撮合系统是一套买卖信息沟通的平台

package struts.fatieaction;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;
import java.sql.SQLException;

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


public class AjaxServlet extends HttpServlet {
    
	public void init(ServletConfig config) throws ServletException {
    }
    
    /*
     *  处理<GET> 请求方法.
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
//    	设置接收信息的字符集
    	request.setCharacterEncoding("UTF-8");
    	//接收浏览器端提交的信息
		String uname = request.getParameter("email");
				
		//设置输出信息的格式及字符集        
        response.setContentType("text/xml; charset=UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        //创建输出流对象
        PrintWriter out = response.getWriter();
        //依据验证结果输出不同的数据信息

        out.println("<response>");
		
        //连接数据库进行身份验证
        DB db = new DB();
		ResultSet rs;
        String strSql=null;
        
        strSql = "select * from webpk.users u where u.email='"
			+ uname + "'";// and psw='" + psw + "'";
		rs = db.executeQuery(strSql);
		
		try {
			if ( rs.next()) {
				//out.println("<res>" + "热烈的欢迎您!" + "</res>");
				out.println("<res>" + "用户名已经存在!" + "</res>");
			}else{
				//out.println("<res>" + "对不起,登录失败！" + "</res>");	
				out.println("<res>" + "可以使用该用户名！" + "</res>");	
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}	
        out.println("</response>");
        out.close();
    }
    /*
     *  处理<POST> 请求方法.
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
       doGet(request, response);
    }
}