HttpServletResponse实现重定向
一个web资源收到客户端请求后，通知a客户访问另一个web资源，这个过程叫重定向
常见场景：用户登录
使用resp.sendRedirect请求跳转至指定的页面
public class RedirectServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// resp.sendRedirect(req.getContextPath()+"/image");
// resp.setHeader("Location","image");
// resp.setStatus(302);
resp.sendRedirect("image");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
image界面是实现验证码
测试request请求
public class RequestTest extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("进入RequestTest请求");
//处理请求
String username = req.getParameter("username");
String password = req.getParameter("password");
System.out.println(username+","+password);
resp.sendRedirect("success.jsp");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
在初始界面进入index.jsp
<html>
<body>
<h2>Hello World!</h2>
<%--提交的路径是项目的路径--%>
<form action="${pageContext.request.contextPath}/login" method="get">
用户名：<input type="text" name="username">
密码：<input type="text" name="pwd">
<input type="submit">
</form>
<%@page contentType="text/html;" pageEncoding="UTF-8"%>
</body>
</html>
提交后跳到request的login下，使用重定向进入success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>
欢迎进入
</h1>
</body>
</html>
servlet定义
<servlet>
<servlet-name>image</servlet-name>
<servlet-class>com.gu.servlet.ImageServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>image</servlet-name>
<url-pattern>/image</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>RedirectServlet</servlet-name>
<servlet-class>com.gu.servlet.RedirectServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RedirectServlet</servlet-name>
<url-pattern>/red</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>request</servlet-name>
<servlet-class>com.gu.servlet.RequestTest</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>request</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
标签：day101,重定向,ServletException,resp,req,HttpServletResponse,Override,image From： https://www.cnblogs.com/GUGUZIZI/p/17239330.html