Servlet 中的请求与响应

时间：2022-11-28 21:03:57

客户端向浏览器发出的请求被封装成为一个HttpServletRequest对象，里面包含了本次请求的所有信息，如地址，参数，提交的数据等等

request已经封装了许多方法来获取这些数据，下面是一个获取数据的例子

package qdm.test;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.Principal;
import java.util.Locale;

/**
 * Created by Seffrui_M on 2015/12/16.
 */
public class FirstServlet extends HttpServlet {
    //返回语言信息
    private String getLocal(Locale local)
    {
        if(Locale.SIMPLIFIED_CHINESE.equals(local))return "简体中文";
        else if(Locale.TRADITIONAL_CHINESE.equals(local))return "繁体中文";
        else if(Locale.ENGLISH.equals(local))return "英文";
        return "其他语言";
    }
    private String getExplore(String agent)
    {
        if(agent.indexOf("TencentTraveler")>0)return "腾讯浏览器";
        else if(agent.indexOf("Firefox")>0)return "火狐浏览器";
        return "其他浏览器";
    }
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        String autoType=request.getAuthType();
        String localAddr=request.getLocalAddr();//获取服务器ip
        String localName=request.getLocalName();//获取服务器名
        int localport=request.getLocalPort();//获取服务器端口号

        Locale  local=request.getLocale();//获取语言环境
        String contextPath=request.getContextPath();//获取context的路径
        String method=request.getMethod();//获取get还是post方法

        String getPathInfo=request.getPathInfo();
        String pathTranslated=request.getPathTranslated();
        String protocol=request.getProtocol();//获取协议信息

        String ip=request.getRemoteAddr();//获取客户端ip
        String remoteUser=request.getRemoteUser();//客户端用户
        int port=request.getRemotePort();//客户端端口;
        String requestURI=request.getRequestURI();//获取URI
        StringBuffer requestURL=request.getRequestURL();//获取URL

        String scheme=request.getScheme();//获取协议头部
        String serverName=request.getServerName();
        int  serverPort=request.getServerPort();
        String servlet=request.getServletPath();
        Principal userPrincipal=request.getUserPrincipal();

        String accept=request.getHeader("accept");
        String referer=request.getHeader("referer");
        String userAgent=request.getHeader("user-agent");
        String serverInfo=this.getServletContext().getServerInfo();


        PrintWriter out=response.getWriter();

        out.println("<html lang=\"zh-cn\">");
        out.println("<body>");
        out.println("<h1>本次访问的信息为</h1><br>");
        out.println("<p>");
        out.println("服务器为:"+localName+"&nbsp&nbsp&nbsp");
        out.println("服务器ip地址为:"+localAddr+"&nbsp&nbsp&nbsp");
        out.println("服务器ip端口号为:"+localport+"<br>");
        out.println("所使用的语言为:"+getLocal(local)+"&nbsp&nbsp&nbsp");
        out.println("context路径:"+contextPath+"&nbsp&nbsp&nbsp");
        out.println("所使用的方法时:"+method+"<br>");
        out.println("路径为:"+getPathInfo+"&nbsp&nbsp&nbsp");
        out.println("路径转移为:"+pathTranslated+"&nbsp&nbsp&nbsp");
        out.println("协议为:"+protocol+"<br>");
        out.println("客户端ip:"+ip+"&nbsp&nbsp&nbsp");
        out.println("客户端用户为:"+remoteUser+"&nbsp&nbsp&nbsp");
        out.println("客户端端口为:"+port+"<br>");
        out.println("URI为:"+requestURI+"&nbsp&nbsp&nbsp");
        out.println("URL为:"+requestURL+"&nbsp&nbsp&nbsp");
　　/*
　　　　　　.
　　　　　　.　　　　
　　　　　　.
　　　　　　.
    */

        out.println("</p>");
        out.println("</body>");
        out.println("</html>");
    }
}

 

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