Request(请求)11.19

request方法

package com.tencent.request;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@WebServlet("/requestDemo1")
public class RequestDemo1 extends HttpServlet {
 protected void doPost(HttpServletRequest request, HttpServletRespon
se response) throws ServletException, IOException {
 }
 protected void doGet(HttpServletRequest request, HttpServletRespons
e response) throws ServletException, IOException {
 
 String method = request.getMethod();
 System.out.println("1:"+method);//GET
 
 String path = request.getContextPath();
 System.out.println("2:"+path);
 
 String servletString = request.getServletPath();
 System.out.println("3:"+servletString);
 
 String queryString = request.getQueryString();
 System.out.println("4:"+queryString);
 
 String requestURI = request.getRequestURI(); // /requestDemo1
 System.out.println("5:"+requestURI);
 StringBuffer requestURL = request.getRequestURL();// http://loc
alhost:8080/requestDemo1
 System.out.println("5:"+requestURL);
 
 String protocol = request.getProtocol();
 System.out.println("6:"+protocol);
 
 String remoteAddr = request.getRemoteAddr();
 System.out.println("7:"+remoteAddr);
 }
}

获取请求头信息

//获取请求头名称
 Enumeration header = request.getHeaderNames();
 //遍历当前对象
 while(header.hasMoreElements()){
 String name = header.nextElement();
 //根据请求头名称获取相应的请求值
 String value = request.getHeader(name);
 System.out.println(name+"--:--"+value);
 }
//user-agent 返回浏览器的版本
 String agent = request.getHeader("user-agent");
 System.out.println(agent);
 if(agent.contains("Chrome")){
 System.out.println("表示使用1浏览器");
 }else if(agent.contains("Firefox")){
 System.out.println("使用2浏览器");
}else{
 System.out.println("其他浏览器访问");
 }
//请求头 referer 表示请求的URL
 String referer = request.getHeader("referer");
 System.out.println(referer);
 //防止别人进行连接盗用
 if(referer != null){//通过连接访问到当前的servlet
 //判断是不是从我们制定的地址跳转到当前的访问
 if(referer.contains("/day01")){
 System.out.println("可以进行访问");
 }else {
 System.out.println("访问已经删除...");
 }
 }else{//直接进行访问
 System.out.println("直接进行访问 ，通过url直接进行访问...");
 }