Servlet中获取请求头的数据

package priv.lwx.javaex.servlet_demo.web.servlet.request;

/**
 * 获取请求头的数据
 *
 * @author liaowenxiong
 * @date 2021/12/29 11:21
 */
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.Enumeration;

@WebServlet("/request_demo02")
public class RequestDemo02 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 获取所有的请求头名称
    Enumeration headerNames = request.getHeaderNames();
    // 遍历取出每个请求头名称
    while (headerNames.hasMoreElements()) {
      String s = headerNames.nextElement();
      // 根据请求头名称获取对应的值
      String value = request.getHeader(s);
      System.out.println(s + " => " + value);
    }
  }

  @Override
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  }
}