Servlet路径

在html项目中，jsp需要连接java文件，一般通过servlet类

那么如何连接servlet类呢？

比如在提交表单时就可以用

<form action="Servlet?method=login" method="post" onsubmit="return check()">

在Servlet类前写

@WebServlet("/Servlet")

就可以了

下面是登录的完整代码

index.jsp

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<%@ page language="java" contentType="text/html; charset=utf-8"
         pageEncoding="utf-8"%>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Login</title>
</head>
<body>

<%
  Object message = request.getAttribute("message");
  if(message!=null && !"".equals(message)){
%>
<script type="text/javascript">
  alert("<%=request.getAttribute("message")%>");
</script>
<%  }  %>

<div id="login">
  <h1>Login</h1>
  <form action="Servlet?method=login" method="post" onsubmit="return check()">
    <input type="text" required="required"  placeholder="请输入账号" name="id"></input>
    <input type="password" required="required"  placeholder="请输入密码" name="password"></input>
    <button class="but" type="submit">登    录</button>
  </form>
</div>
</body>
</html>
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Servlet.java(置于Servlet包中）

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package Servlet;
import Dao.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;
@WebServlet("/Servlet")
public class Servlet extends HttpServlet{
    private static final long serialVersionUID = 1L;

    public Servlet() {
        super();
    }
    Dao dao=new Dao();

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String method = req.getParameter("method");
        if ("login".equals(method)) {
            login(req, resp);
        }
    }
    //------------------------------------------------------------------------------------------------------
    private void login(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        // TODO Auto-generated method stub
        String id = req.getParameter("id");
        HttpSession session =req.getSession();
        session.setAttribute("id",id);
        String password = req.getParameter("password");
        System.out.println("servlet.login"+" id="+id+" password="+password);
        User user=dao.login(id);
        System.out.println(user.getForm());
        if(user.getPassword()!=null&&user.getPassword().equals(password)) {
            req.setAttribute("message", "登录成功");
            if (user.getForm().equals("管理员")) {
                req.getRequestDispatcher("admin.jsp").forward(req, resp);
            } else if (user.getForm().equals("教师")) {
                req.getRequestDispatcher("teacher.jsp").forward(req, resp);
            }
        }else{
            req.setAttribute("message","登录失败");
            req.getRequestDispatcher("index.jsp").forward(req,resp);
        }
    }
}
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详细见：https://www.cnblogs.com/yijiahao/p/11797430.html

posted @   我试试这个昵称好使不  阅读(53)  评论(0)  编辑  收藏  举报
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