login.java

vb+java实现的图书管理系统

package servlet;

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 javax.servlet.http.HttpSession;

import com.bean.util.DbConn;

public class Login extends HttpServlet {

	public Login() {
		super();
	}

	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("gbk");
		response.setContentType("text/html;charset=gbk");
		PrintWriter out = response.getWriter();
		   String id=request.getParameter("uid");
		   String password=request.getParameter("upsw");
		   DbConn conn=new DbConn();
		   String sql="select readerpsw from ReaderInfo where readerId="+id+"";
		   String[][] readers=conn.getData(sql);
		   if(readers==null){
			   out.println("<script type=text/javascript>alert('证件号不存在');history.go(-1);</script>");
		   }
		   else if(readers[0][0].equals(password)){
			   HttpSession session=request.getSession(true);
			   session.setAttribute("user",String.valueOf(id));
			   response.sendRedirect("index.jsp?contr=myInfo&type=rdInfoMore");
		   }
		   else{
			   out.println("<script type=text/javascript>alert('密码错误');history.go(-1);</script>");
		   }
	}

	public void init() throws ServletException {
		// Put your code here
	}

}