Servlet request常用方法

Posted 2020-11-27 xun-

Servlet request常用方法

方法名	作用
req.getRemoteAddr	获取客户端IP地址
req.getLocalAddr()	获取服务器IP地址
req.getRemoteHost	获取客户端的主机名
req.getRemotePort	获取客户端的端口号
req.getLocalPort	获取服务器的端口号
req.getLocalName	获取服务器主机名
req.getContextPath	获取ContextPath
req.getServletPath()	获取ServletPath
req.getMethod	获取请求方式
req.getQueryString	获取请求的参数的值
req.getRequestURL	获取请求全路径

新建类Requests

继承HttpServlet并重写doGet方法

package com.szx.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class Requests extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("客户端ip---------req.getRemoteAddr():"+req.getRemoteAddr());
        System.out.println("获取服务器ip------req.getLocalAddr():"+req.getLocalAddr());
        System.out.println("客户端主机名------req.getRemoteHost():"+req.getRemoteHost());
        System.out.println("客户端端口号------req.getRemotePort():"+req.getRemotePort());
        System.out.println("服务器主机名-------req.getLocalName():"+req.getLocalName());
        System.out.println("获取ContextPath--req.getContextPath():"+req.getContextPath());
        System.out.println("ServletPath()---req.getServletPath():"+req.getServletPath());
        System.out.println("请求方式----------req.getMethod():"+req.getMethod());
        System.out.println("请求的值----------req.getQueryString():"+req.getQueryString());
        System.out.println("请求全路径--------RequestURL():"+req.getRequestURL());
    }
}

配置web.xml文件

    <servlet>
        <servlet-name>Requests</servlet-name>
        <servlet-class>com.szx.servlet.Requests</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Requests</servlet-name>
        <url-pattern>/requests</url-pattern>
    </servlet-mapping>

开启服务并访问地址,查看结果

其中QueryString为null因为没有传入参数

添加请求参数查看结果