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步骤 2 : 服务端跳转 步骤 3 : 客户端跳转 步骤 4 : 服务端跳转与客户端跳转图示
首先在web目录下准备两个页面 success.html,fail.html
分别用于显示登录成功 或者登录失败 如果登录成功了，就服务端跳转到success.html 如果登录失败了，就客户端跳转到fail.html
<div style="color:green">login success</div>
<div style="color:green">login success</div>
<div style="color:red">login fail</div>
<div style="color:red">login fail</div>
在Servlet中进行服务端跳转的方式：
request.getRequestDispatcher("success.html").forward(request, response); 服务端跳转可以看到浏览器的地址依然是/login 路径，并不会变成success.html import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");
String password = request.getParameter("password");
if ("admin".equals(name) && "123".equals(password)) {
request.getRequestDispatcher("success.html").forward(request, response);
}
}
}
在Servlet中进行客户端跳转的方式：
response.sendRedirect("fail.html"); 可以观察到，浏览器地址发生了变化 import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");
String password = request.getParameter("password");
if ("admin".equals(name) && "123".equals(password)) {
request.getRequestDispatcher("success.html").forward(request, response);
}
else{
response.sendRedirect("fail.html");
}
}
}
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