HTTP Servlet Request 获得请求行、请求头、请求体、完成防盗链(页码SR2.1)

港控/mmm° 2023-07-08 12:28 25阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70]  
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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 3]  
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有时无法访问服务器其实是DNS服务器宕机  
可以通过访问URL获得解析前的IP直接访问服务器地址  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 5]  
测试代码如下

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;
    /**
     * 获得请求行内容
     * @author V
     *
     */
    public class LineServlet extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//1.获得请求方式
    		String method = request.getMethod();
    		System.out.println("method:"+method);
    		//2.获得请求的资源相关的内容
    		String requestURI = request.getRequestURI();
    		StringBuffer requestURL = request.getRequestURL();
    		System.out.println("uri:"+requestURI);
    		System.out.println("url:"+requestURL);
    		//获得WEB应用的名称
    		String contextPath = request.getContextPath();
    		System.out.println("web应用名称:"+contextPath);
    		//获得地址后参数的字符串
    		String queryString = request.getQueryString();
    		System.out.println("web参数:"+queryString);
    		//3.获得库户籍的信息--获得访问者IP地址
    		String remoteAddr = request.getRemoteAddr();
    		System.out.println("IP:"+remoteAddr);
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 6]

package cn.aynortechnology.header;
    
    import java.io.IOException;
    import java.util.Enumeration;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class HeaderServlet extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//1.获得指定的头-------常用---------
    		String header = request.getHeader("User-Agent");
    		System.out.println(header);
    		//2.获得所有头的名字
    		Enumeration<String> headerNames = request.getHeaderNames();
    		while(headerNames.hasMoreElements()){
    			String headername = headerNames.nextElement();
    			String headerValue = request.getHeader(headername);
    			System.out.println(headername+":"+headerValue);
    		}
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

![在这里插入图片描述][20200226180916679.png]  
[防盗链原理][Link 1]  
只有请求头referer(请求来源地址)与设定的主页面地址相同才能完成跳转

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 ReferServlet extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//对该新闻的来源进行判断
    		String header = request.getHeader("referer");
    		if(header!=null&&header.startsWith("http://localhost")) {
    			//如果是从我自己的主页跳转过去的，可以看到内容
    			response.setContentType("text/html;charset=UTF-8");
    			response.getWriter().write("这是一条新闻(防盗链测试)");
    		}else {
    			response.setContentType("text/html;charset=UTF-8");
    			response.getWriter().write("你是盗链者，想peach");
    		}
    		
    		
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 7]

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<a href="/WEB15/header">访问headerServlet资源</a>
    	<form action="/WEB15/line" method="post">
    		<input type="text" name="username"><br>
    		<input type="password" name="password"><br>
    		<input type="submit" value="提交"><br>
    	</form>
    	<hr/>
    		<form action="/WEB15/content" method="post">
    		<input type="text" name="username"><br>
    		<input type="password" name="password"><br>
    		<input type="checkbox" name="hobby" value="zq">足球<br>
    		<input type="checkbox" name="hobby" value="pq">排球<br>
    		<input type="checkbox" name="hobby" value="ppq">乒乓球<br>
    		<input type="submit" value="提交"><br>
    	</form>
    </body>
    </html>

package cn.aynortechnology.content;
    
    import java.io.IOException;
    import java.util.Enumeration;
    import java.util.Map;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class ContentServlet extends HttpServlet {
    
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//1.获得单个表单值
    		String username = request.getParameter("username");
    		System.out.println(username);
    		String password = request.getParameter("password");
    		System.out.println(password);
    		//2.获得多个表单值
    		String[] hobbys = request.getParameterValues("hobby");
    		for(String hobby:hobbys) {
    			System.out.println(hobby);
    		}
    		//3.获得所有的请求参数的名称
    		Enumeration<String> parameterNames = request.getParameterNames();
    		while(parameterNames.hasMoreElements()) {
    			System.out.println(parameterNames.nextElement());
    		}
    		System.out.println("----------------");
    		//4.获得所有的参数 参数封装到一个Map<String,String[]>
    		Map<String, String[]> parameterMap = request.getParameterMap();
    		for(Map.Entry<String, String[]> entry:parameterMap.entrySet()) {
    			System.out.println(entry.getKey());
    			for(String str:entry.getValue()) {
    				System.out.println(str);
    			}
    			System.out.println("-----------------");
    		}
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

此部分代码解析请见[此文章][Link 2]\-泛型部分  
![在这里插入图片描述][2020022620580870.png]

package cn.aynortechnology.forward;
    
    import java.io.IOException;
    
    import javax.servlet.RequestDispatcher;
    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 {
    		//向request域中存数据
    		request.setAttribute("name", "aynor");
    		
    		
    		//servlet1将请求转发给servlet2
    		RequestDispatcher dispatcher = request.getRequestDispatcher("/servlet2");
    		//执行转发方法
    		dispatcher.forward(request, response);
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

package cn.aynortechnology.forward;
    
    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 {
    		//从request域中取数据 强制转化的前提是知道这个变量是什么类型的
    		Object attribute = request.getAttribute("name");
    				
    		response.getWriter().write("hello aynor"+attribute);
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

**请求转发** [请求转发的定义以及请求转发与重定向的区别][Link 3]  
![在这里插入图片描述][20200226203950569.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 8]

package cn.aynortechnology.forward;
    
    import java.io.IOException;
    
    import javax.servlet.RequestDispatcher;
    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 {
    		//servlet1将请求转发给servlet2
    		RequestDispatcher dispatcher = request.getRequestDispatcher("/servlet2");
    		//执行转发方法
    		dispatcher.forward(request, response);
    	}
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doGet(request, response);
    	}
    }

![在这里插入图片描述][20200226210239726.png]  
![在这里插入图片描述][20200226210851122.png]  
[(页码SR2.1)HTTP Servlet Request 获得请求行、请求头、请求体、完成防盗链][SR2.1_HTTP Servlet Request]  
[(页码SR2.2)HTTP Servlet Request 注册和登录的基本实现][SR2.2_HTTP Servlet Request]

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[20200226180916679.png]: https://img-blog.csdnimg.cn/20200226180916679.png
[Link 1]: https://blog.csdn.net/u012726702/article/details/55510664
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[Link 2]: https://blog.csdn.net/qq_40922845/article/details/104523022
[2020022620580870.png]: https://img-blog.csdnimg.cn/2020022620580870.png
[Link 3]: https://blog.csdn.net/qq_40922845/article/details/104524340
[20200226203950569.png]: https://img-blog.csdnimg.cn/20200226203950569.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1_size_16_color_FFFFFF_t_70 8]: https://img-blog.csdnimg.cn/20200226203448298.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwOTIyODQ1,size_16,color_FFFFFF,t_70
[20200226210239726.png]: https://img-blog.csdnimg.cn/20200226210239726.png
[20200226210851122.png]: https://img-blog.csdnimg.cn/20200226210851122.png
[SR2.1_HTTP Servlet Request]: https://blog.csdn.net/qq_40922845/article/details/104519511
[SR2.2_HTTP Servlet Request]: https://blog.csdn.net/qq_40922845/article/details/104534202