- 具体思想，在点击登录是时候，将当前界面的地址callback通过get方式传到login界面，login界面再通过方式传递过去
some.jsp
<%@ page import="java.util.List" %>
<%@ page import="java.util.Collection" %><%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/6/4 0004
Time: 上午 11:12
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<a id="logina" href="login.jsp?callback=">login</a>
</body>
<script type="text/javascript">
var a = document.getElementById("logina");
console.log(a);
a.href+=window.location.href;
</script>
</html>login.jsp
<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/6/4 0004
Time: 下午 1:04
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form method="post" action="login">
<input type="text" name="name"/>
<input type="password" name="password"/>
<input type="hidden" name="callback" value="<%=request.getParameter("callback")%>"/>
<input type="submit" value="login"/>
</form>
</body>
</html>controller
package controller;
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 java.io.IOException;
@WebServlet(name = "LoginServlet",urlPatterns = {"/login"})
public class LoginServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
/**
* 省略对用户名和密码的操作，和数据库匹配
*
* */
String callback = request.getParameter("callback");
response.sendRedirect(callback);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
}