用servlet做了一个简单的登录界面

代码：

Login类

package com.ccit;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
@WebServlet("/login")
public class Login extends GenericServlet {

	@Override
	public void service(ServletRequest req, ServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/html;charset=gbk");
		PrintWriter out=resp.getWriter();
		out.println("");
		out.print("");
		out.print("");
		out.println("");
		out.println("");
		out.println("");
		out.println("");
		out.println("
");
		out.println("
用户名:");
		out.println(" ");
		out.println("
");
		out.println("
密码:");
		out.println("");
		out.println("
");    
		out.println("
");
		out.println("");
		out.println("");
		out.println("
");
		out.println("
");
		out.println("");
		out.println("");
		out.println("");
out.close();
}
}

CheckLogin类：

package com.ccit;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
@WebServlet("/checkLogin")
public class CheckLogin extends GenericServlet {

	@Override
	public void service(ServletRequest req, ServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/html;charset=gbk");
		PrintWriter out=resp.getWriter();
		req.setCharacterEncoding("gbk");
		String name=null !=req.getParameter("name")?req.getParameter("name"):"";
        String pwd=null!=req.getParameter("pwd")?req.getParameter("pwd"):"";
        if("张三".equalsIgnoreCase(name)&&"123".equalsIgnoreCase(pwd)){
        	out.println("");
        	
        }else
        {
        	out.println("");
        	
        }
        out.close();
	}

}

WelcomeServlet类：

package com.ccit;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
@WebServlet("/welcome")
public class WelcomeServlet extends GenericServlet {

	@Override
	public void service(ServletRequest req, ServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("text/html;charset=gbk");
		PrintWriter out=resp.getWriter();
		out.println("welcome");
		out.println("返回");
		out.close();

	}

}

运行截图：

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