📄 loginformservlet.java

📁 用java编写的程序
💻 JAVA
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package webbook.chapter4;

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;

/**
 * @author Liuwei
 * @version 1.0
 */
public class LoginFormServlet extends HttpServlet {

	private static final long serialVersionUID = -3646490724035878521L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("<html>");
		out.println("<head><title>login form page</title></head>");
		out.println("<body>");
		out.println("<h2>请输入登录信息</h2>");
		out.println("<form method=\"post\" action=\"" + request.getContextPath()
				+ "/servlet/loginForm\">");
		out.println("<table border=\"1\"><tr><td>");
		out.println("用户名: </td><td>");
		out.println("<input type=\"text\" name=\"username\" size=\"20\">");
		out.println("</td></tr><tr><td>");

		out.println("密码: </td><td>");
		out.println("<input type=\"password\" name=\"password\" size=\"20\">");
		out.println("</td></tr><tr><td>&nbsp;</td>");

		out.println("<td><input type=\"submit\" value=\"登录\"></td></tr>");
		out.println("</table></form>");
		out.println("</body>");
		out.println("</html>");

		out.flush();
		out.close();
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		request.setCharacterEncoding("utf-8");
		out.println("<html>");
		out.println("<head><title>display login infomation</title></head>");
		out.println("<body>");

		String username = request.getParameter("username");
		String password = request.getParameter("password");

		if (username == null || username.length() == 0 || password == null
				|| password.length() == 0) {
			out.println("<h2>输入用户名和密码不正确！</h2>");
			out.println("<br><a href=\"" + request.getContextPath()
					+ "/servlet/loginForm\">请重新登录</A>");
		} else {
			out.println("<h2>用户输入信息：</h2>");
			out.println("<strong>用户名：" + username + "</strong><br>");
			out.println("<strong>密码" + password + "</strong><br>");
		}

		out.println("</body>");
		out.println("</html>");
		out.flush();
		out.close();
	}

}
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