📄 loginservlet.java

📁 一般网页里面实现图片切换的这个电子相册的代码
💻 JAVA
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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.security.*;
import javax.servlet.http.*;
import java.util.*;

import userinfo.UserBean;

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
	}

	/**
	 * 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 {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * 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 {

		response.setContentType("text/html");
		/*
		 * PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML
		 * PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>");
		 * out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		 * out.println(" <BODY>"); out.print(" This is ");
		 * out.print(this.getClass()); out.println(", using the POST method");
		 * String name=request.getParameter("Name"); out.println(name);
		 * out.println(" </BODY>"); out.println("</HTML>"); out.flush();
		 * out.close();
		 */

		String id = request.getParameter("id");
		String password = request.getParameter("Password");
		String go = "";
		UserBean myBean = new UserBean();
		int flag = myBean.login(id, password); // 验证登陆成功与否
		if (flag > 0) {
			HttpSession session = request.getSession(true);
			session.setAttribute("login", "true");
			session.setAttribute("id", id);
			// session.setAttribute("logintime", "" + id);
			go = "../Index.jsp"; // 登陆成功
		} else {
			go = "../Login.jsp"; // 登陆失败
		}
		response.sendRedirect(go);

	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
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