HttpServletRequest对象——获取请求头

偏执的太偏执、 2022-03-21 03:07 435阅读 0赞

### 方法 ###

*  getHeaderNames() //获取所有的请求头
 *  getHeader(String s) //根据请求头的名字获取请求头的值

### 实例 ###

package net.test.servlet;
    
    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;
    import java.util.Enumeration;
    
    @WebServlet(name="helloServlet",urlPatterns="/header")  //1、配置servlet
    public class HelloServlet extends HttpServlet {  //2、继承HttpServlet
    
        //3、重写doPost方法
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        }
    
        //3、重写doGet方法
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            Enumeration<String> headerNames = req.getHeaderNames();
            while(headerNames.hasMoreElements()){
                String element = headerNames.nextElement();
                System.out.println(element+":"+req.getHeader(element));
            }
        }
    }

**在浏览器上运行：**  
![在这里插入图片描述][20190130111825552.]  
**运行结果：**  
![在这里插入图片描述][20190130111751876.]

[20190130111825552.]: /images/20220321/4071e2d4691e4f24b7fb89e63131f34a.png
[20190130111751876.]: /images/20220321/dea8cad3baba4840b9ec8d2b06cf922f.png