• Response常见应用

    1.

    客户机服务端口是随机的

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;

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 jdk.nashorn.internal.ir.RuntimeNode.Request;

/**
 * Servlet implementation class GetInfoServlet
 */
@WebServlet("/GetInfoServlet")
public class GetInfoServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GetInfoServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out=response.getWriter();
        //得到完整URL
        String uri=request.getRequestURI().toString();
        System.out.println("URI== "+uri);
        //uri 资源名称
        String url=request.getRequestURL().toString();
        System.out.println("URL=="+url);
        //传递信息部分 接收以get方式提交的数据
        String queryString=request.getQueryString();
        System.out.println("queryString=="+queryString);
        //getRemonteAdd获取对方的IP
        String add=request.getRemoteAddr();
        System.out.println(add);
//if(add.equals("0:0:0:0:0:0:0:1")){//可用于拒绝他人的请求
//    response.sendRedirect("/encoding/Err");
//}
//
String host=request.getRemoteHost();
System.out.println(host);
int port=request.getRemotePort();
int serverport=request.getLocalPort();
System.out.println("客户机"+add+"使用的端口"+port);
System.out.println("服务器使用的端口"+serverport);

        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(request, response);
    }

}
    View Code

     下载功能的实现：

    getHeaderNames()  通过消息头获取

    把整个http请求获取：

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class GetRequestHeader
 */
@WebServlet("/GetRequestHeader")
public class GetRequestHeader extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GetRequestHeader() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        String host=request.getHeader("host");
        System.out.println(host);
        //getHeaderNames
        Enumeration<String> header=request.getHeaderNames();
        while(header.hasMoreElements()){
            //
            String headername=header.nextElement();
            System.out.println(headername+":"+request.getHeader(headername));
        }
        
    }
    

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}
    View Code

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;

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 jdk.nashorn.internal.ir.RuntimeNode.Request;

/**
 * Servlet implementation class GetInfoServlet
 */
@WebServlet("/GetInfoServlet")
public class GetInfoServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GetInfoServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out=response.getWriter();
        //得到完整URL
        String uri=request.getRequestURI().toString();
        System.out.println("URI== "+uri);
        //uri 资源名称
        String url=request.getRequestURL().toString();
        System.out.println("URL=="+url);
        //传递信息部分 接收以get方式提交的数据
        String queryString=request.getQueryString();
        System.out.println("queryString=="+queryString);
//        //通过split函数实现分割
//        String[] querString=queryString.split("&");
//        for(String s:querString){
//            out.println(s);
//
//         }
//        //getRemonteAdd获取对方的IP
        String add=request.getRemoteAddr();
        System.out.println(add);
//if(add.equals("0:0:0:0:0:0:0:1")){//可用于拒绝他人的请求
//    response.sendRedirect("/encoding/Err");
//}
        
String host=request.getRemoteHost();
System.out.println(host);
int port=request.getRemotePort();
int serverport=request.getLocalPort();
System.out.println("客户机"+add+"使用的端口"+port);
System.out.println("服务器使用的端口"+serverport);

        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(request, response);
    }

}
    View Code

    getHeader方法：

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class GetRequestHeader
 */
@WebServlet("/GetRequestHeader")
public class GetRequestHeader extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GetRequestHeader() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        String host=request.getHeader("host");
        System.out.println(host);
        //getHeaderNames
        Enumeration<String> header=request.getHeaderNames();
        while(header.hasMoreElements()){
            //
            String headername=header.nextElement();
            System.out.println(headername+":"+request.getHeader(headername));
        }
        
    }
    

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}
    View Code

    control.java

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Controler
 */
@WebServlet("/Controler")
public class Controler extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Controler() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        String u=request.getParameter("username");
        String p=request.getParameter("password");
        String sex=request.getParameter("sex");
        //接收复选框的内容
        String[] hobby=request.getParameterValues("hobby");
        String city=request.getParameter("city");
        String intro=request.getParameter("intro");
        String hidden=request.getParameter("hidden1");
        
        out.println("用户名"+u);
        out.println("密码"+p);
        out.println("性别"+sex);
        if(hobby!=null){
        for(int i=0;i<hobby.length;i++){
            out.println(hobby[i]);
        }
        }else {
            out.print("重写");
        }
        out.println("<br/>他们所在的城市"+city);
        out.println("<br/>个人介绍"+intro);
        out.println("隐藏控件传递的数据是"+hidden);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(request, response);
    }

}
    View Code

    MyForm.java

    package com.hsp;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class MyFrom
 */
@WebServlet("/MyFrom")
public class MyFrom extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MyFrom() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        
        out.println("<form action='/encoding/Controler' method='post'>");
        out.println("用户名:<input type='text' name='username'/><br/>");
        out.println("密码：<input type='password' name='password'/><br/>");
        out.println("性别：<input type='radio' name='sex' value='男'/>男<input type='radio' name='sex' value='女'/>女<br/>");
        out.println("爱好：<input type='checkbox' name='hobby' value='音乐'/>音乐<input type='checkbox' name='hobby' value='跑步'/>跑步");
        out.println("所在城市:<select name='city'> <option value='北京'>北京</option> <option value='重庆'>重庆</option> </select>");
        out.println("<input type='submit' value='提交'/><br/>");
        out.println("你的介绍:<textarea cols='20' rows='10' name='intro' value='abc'></textarea><br/>");
        out.println("提交照片:<input type='file' name='photo'/><br/>");
        out.println("<input type='hidden' value='abc' name='hidden1'>");
        //hidden数据不愿意让用户看到，不希望影响界面，同时业务逻辑使用该数据
        out.println("</form>");
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        this.doGet(request, response);
    }

}
    View Code
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  • 原文地址：https://www.cnblogs.com/helloworld2019/p/10996137.html
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