HTTP Servlet Response设置响应头、重定向、定时刷新(页码SR1)

逃离我推掉我的手 2023-07-07 08:56 13阅读 0赞

HTTP Servlet Response运行过程  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 1]  
**通过Response设置响应行**  
![在这里插入图片描述][20200222155516943.png]

package cn.aynortechnology.line;
    
    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 StatusServlet extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//手动设置http响应行中的状态码
    		response.setStatus(404);
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

**通过Response设置响应头**  
![在这里插入图片描述][20200222155544835.png]

package cn.aynortechnology.header;
    
    import java.io.IOException;
    import java.util.Date;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class Header extends HttpServlet {
    		
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		Date date = new Date();
    		//设置响应头
    		//add在遇到同名的时候会加到后面
    		response.addHeader("name", "aynor");
    		response.addIntHeader("age", 21);
    		response.addDateHeader("birthday", date.getTime());
    		//set
    		response.setHeader("name", "wangwang");
    		response.setIntHeader("age", 23);
    	}
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

**重定向**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 2]  
重定向：  
\-状态码：302  
\-响应头：location代表重定向的地址  
新建两个Servlet作为源和重定向测试一下  
Servlet1

package cn.aynortechnology.header;
    
    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 Servlet1 extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//没有响应资源 告知客户端去重定向到servlet2
    		//1.设置状态码302
    		response.setStatus(302);
    		//2.设置响应头Location
    		response.setHeader("Location", "/WEB14/servlet2");
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

Servlet2

package cn.aynortechnology.header;
    
    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 Servlet2 extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		response.getWriter().write("hello aynor");
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

使用Servlet1直接跳转到Servlet2  
![在这里插入图片描述][20200222163218451.png]  
![在这里插入图片描述][20200222163242319.png]  
一个封装好的方法

//封装成一个重定向的方法sendRedirect(url)
    response.sendRedirect("/WEB14/servlet2");

定时刷新(跳转)

package cn.aynortechnology.header;
    
    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 Refresh extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//设置定时刷新的头
    		response.setHeader("refresh", "5;url=http://www.baidu.com");
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

用js完成页面定时跳转

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    <script type="text/javascript">
    	window.onload = function(){
    		var time = 5;
    		var secondEle = document.getElementById("second");
    		var timer = setInterval(function(){
    			secondEle.innerHTML = time;
    			time--;
    			if(time==0){
    				clearInterval(timer);
    				location.href="http://www.baidu.com";
    			}
    		},1000);
    	}
    </script>
    </head>
    <body>
    	恭喜您，注册成功，<span style="color:red" id="second">5</span>秒钟后跳转，如不跳转请点击<a href="http://www.baidu.com"'>这里</a>！
    </body>
    </html>

[(页码SR1)HTTP Servlet Response设置响应头、重定向、定时刷新][SR1_HTTP Servlet Response]  
[(页码SR2)HTTP Servlet Response设置响应体、发送中文、图片][SR2_HTTP Servlet Response]  
[(页码SR3)HTTP Servlet Response文件下载基本代码][SR3_HTTP Servlet Response]  
[(页码SR4)HTTP Servlet Response一次性验证码的实现][SR4_HTTP Servlet Response]  
整合：HTTP Servlet Response完成文件下载、一次性验证码的实现

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200222153341297.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200222153521388.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1,size_16,color_FFFFFF,t_70
[20200222155516943.png]: https://img-blog.csdnimg.cn/20200222155516943.png
[20200222155544835.png]: https://img-blog.csdnimg.cn/20200222155544835.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200222162327178.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1,size_16,color_FFFFFF,t_70
[20200222163218451.png]: https://img-blog.csdnimg.cn/20200222163218451.png
[20200222163242319.png]: https://img-blog.csdnimg.cn/20200222163242319.png
[SR1_HTTP Servlet Response]: https://blog.csdn.net/qq_40922845/article/details/104444704
[SR2_HTTP Servlet Response]: https://blog.csdn.net/qq_40922845/article/details/104448580
[SR3_HTTP Servlet Response]: https://blog.csdn.net/qq_40922845/article/details/104452337
[SR4_HTTP Servlet Response]: https://blog.csdn.net/qq_40922845/article/details/104460218