一个完整的servlet验证登录用户名和密码实例

江山如画 • 2020年12月6日下午7:26 • 编程开发 • 阅读 4007

servlet验证登录用户名和密码实例项目结构

登录页面login.html

servlet验证通过后，欢迎页面

登录页面login.html：

<body>
  <form action="LoginCheck" method="post">
  用户名：<input type="text" name="username" /><br>
  密码：<input type="text" name="password" />
  <br><input type="submit" value="登陆" />
</form>
</body>

web.xml文件部署servlet:

<servlet>
    <servlet-name>LoginCheck</servlet-name>
    <servlet-class>com.my.servlet.LoginCheck</servlet-class>
</servlet> 
<servlet-mapping>
    <servlet-name>LoginCheck</servlet-name>
    <url-pattern>/LoginCheck</url-pattern>
</servlet-mapping>

LoginCheck.java (servlet)

package com.my.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;public class LoginCheck extends HttpServlet {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();
}

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

response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String name=request.getParameter("username");
String password=request.getParameter("password");
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>");
if("www.xin126.cn".equals(name)&&"123".equals(password))
{
out.print("欢迎你"+name);
}
else
{
out.print(" 用户名或密码不对！ ");
}
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}

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