📄 loginservlet.java
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package blogServlet;
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;
/**
* 用户登录验证界面
* @author Administrator
*/
public class loginServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public loginServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
public void service(HttpServletRequest request,HttpServletResponse response)
throws IOException{
System.out.println("Enter loginServlet ");
//确认用户是否重复登录
javax.servlet.http.HttpSession session = request.getSession();
UserInfo user=(UserInfo)session.getAttribute("LoginUser");
if(null!=user&&user.getName().equals(request.getAttribute("userName"))){
System.out.println("此用户已经登录过");
response.sendRedirect("ShowUserBlogsServlet");
return ;
}
PrintWriter out = response.getWriter();
String nameLogin = request.getParameter("userName");
String pwdLogin = request.getParameter("pwd");
try{
boolean flag = DaoUserInfo.userLoginConfirm(nameLogin, pwdLogin);
if(flag){//登录成功,将用户信息存入session，并转向用户日志显示页面
UserInfo ui = new UserInfo();
ui.setName(nameLogin);
ui.setPwd(pwdLogin);
session.setAttribute("LoginUser", ui);
response.sendRedirect("ShowUserBlogsServlet");
}
else{
// out.println("<HTML>");
// out.println("<HEAD><TITLE>登录失败</TITLE></HEAD><BODY>");
// out.println("Your name:" + nameLogin);
// out.println("<br>");
// out.println("Your password:" + pwdLogin);
// out.println("登录失败，用户名或密码错误,请确认用户名和密码，或注册！！！");
// request.getRequestDispatcher("/login.html").include(request, response);
// out.println("<BODY>");
// out.println("</HTML>");
//JSP测试
String errMsg = "用户或密码错误";
request.setAttribute("errTips", "用户或密码错误");
System.out.println("errMsg : "+request.getAttribute("errTips"));
request.getRequestDispatcher("/login.jsp").include(request, response);
}
}catch(Exception ex){
ex.printStackTrace();
}
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
System.out.println("Enter init of loginServlet");
//初始化数据库参数：
SqlConnection.databaseDriver = this.getInitParameter("dbDriverName");
SqlConnection.databaseType = this.getInitParameter("dbType");
SqlConnection.host = this.getInitParameter("dbHost");
SqlConnection.port = this.getInitParameter("dbPort");
SqlConnection.databaseName = this.getInitParameter("dbName");
SqlConnection.dbUserName = this.getInitParameter("dbUserName");
SqlConnection.databasePwd = this.getInitParameter("dbPwd");
// System.out.println("数据库驱动名："+SqlConnection.databaseDriver);
// System.out.println("数据库类型："+SqlConnection.databaseType);
}
}
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