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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"......
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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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