java web-转发、重定向
这里用简单的例子分别实现转发和重定向,然后对其进行比较。1、转发(forward)
首先在简单修改下index.jsp以实现最基本的登录功能:接下来编写servlet接收该请求并执行简单的登录校验:
package com.zx.demo;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;import java.io.IOException;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String loginName = req.getParameter("loginName");
String password = req.getParameter("password");if (loginName == null || loginName.trim().equals("")) { resp.getWriter().write("username must not null"); return; } if (password == null || password.trim().equals("")) { resp.getWriter().write("password must not null"); return; } if (loginName.equals("admin") && password.equals("123456")) { req.getRequestDispatcher("helloworld").forward(req, resp); } else { resp.getWriter().write("username or password wrong"); }}
}
运行程序,输入正确账号密码,请求会被转发到
helloworld
servlet,转发不会改变请求url和参数,结果如下:2、重定向(redirect)
延用上述jsp,修改servlet代码实现重定向,重定向url既可以是本容器,也可以是外部地址:package com.zx.demo;import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String loginName = req.getParameter("loginName");
String password = req.getParameter("password");
if (loginName == null || loginName.trim().equals("")) { resp.getWriter().write("username must not null"); return; } if (password == null || password.trim().equals("")) { resp.getWriter().write("password must not null"); return; } if (loginName.equals("admin") && password.equals("123456"......原文转载:http://www.shaoqun.com/a/898544.html
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javaweb-转发、重定向这里用简单的例子分别实现转发和重定向,然后对其进行比较。1、转发(forward)首先在简单修改下index.jsp以实现最基本的登录功能:接下来编写servlet接收该请求并执行简单的登录校验:packagecom.zx.demo;importjakarta.servlet.ServletException;importjakarta.servlet.http.Htt
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