Solicitud de servlet Java

package cn.ituy.web.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.BufferedReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Enumeration;
import java.util.Map;
import java.util.Set;

//新建Module,File-New Module(里面选择Java Enterprise和在Additional libraries and Frameworks 勾选Web Application，不勾选最下面的Create web.xml)。
//新建一个package（cn.ituy.web.servlet），在package下右键创建一个New-Create new Servlet,命名为RequestDemo1 .

@WebServlet("/RequestDemo1")
public class RequestDemo1 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {



        //获取请求消息体--请求参数
        //只有post方式才有请求体
        /*
        * 获取字符流对象
        * BufferedReader getReader() 获取字符输入流，只能操作字符数据
        * ServletInputStream getInputStream() 获取字节输入流，可以操作所有数据
        * */
        //1.获取字符流
        BufferedReader br = request.getReader();
        //2.读取数据
        String line = null;
        while((line = br.readLine()) != null){
            System.out.println(line);
        }

        DoHttpServletRequestData(request);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     /*
     获取请求行:
            1. 获取请求方式 ：GET
                * String getMethod()
            2. (*)获取虚拟目录：/day14
                * String getContextPath()
            3. 获取Servlet路径: /requestDemo1
                * String getServletPath()
            4. 获取get方式请求参数：name=zhangsan
                * String getQueryString()
            5. (*)获取请求URI：/day14/demo1
                * String getRequestURI():		/day14/requestDemo1
                * StringBuffer getRequestURL()  :http://localhost/day14/requestDemo1
            6. 获取协议及版本：HTTP/1.1
                * String getProtocol()

            7. 获取客户机的IP地址：
                * String getRemoteAddr()

         */
        //1. 获取请求方式 ：GET
        String method = request.getMethod();
        System.out.println(method);
        //2.(*)获取虚拟目录：/day14
        String contextPath = request.getContextPath();
        System.out.println(contextPath);
        //3. 获取Servlet路径: /demo1
        String servletPath = request.getServletPath();
        System.out.println(servletPath);
        //4. 获取get方式请求参数：name=zhangsan
        String queryString = request.getQueryString();
        System.out.println(queryString);
        //5.(*)获取请求URI：/day14/demo1
        String requestURI = request.getRequestURI();
        StringBuffer requestURL = request.getRequestURL();
        System.out.println(requestURI);
        System.out.println(requestURL);
        //6. 获取协议及版本：HTTP/1.1
        String protocol = request.getProtocol();
        System.out.println(protocol);
        //7. 获取客户机的IP地址：
        String remoteAddr = request.getRemoteAddr();
        System.out.println(remoteAddr);

        //------
        //获取请求头数据
        /*
        * String getHeader(String name) :根据名称获取请求头的值
        * Enumeration<String> getHeaderNames() :获取所有请求头名称
        */
        //1.获取所有请求头名称
        Enumeration<String> headerNames = request.getHeaderNames();
        //2.遍历
        while(headerNames.hasMoreElements()){
            String name = headerNames.nextElement();
            //根据名称获取请求头的值
            String value = request.getHeader(name);
            System.out.println(name+"---"+value);
        }
        //referer ,访问url的来源，要是直接访问就是null，从其他页面访问的会有网址
        String referer = request.getHeader("referer");
        System.out.println(referer);//http://localhost:8080/LearnTomcat_war_exploded/login.html
        //防盗链
        if(referer != null ){
            if(referer.contains("/LearnTomcat_war_exploded")){
                //正常访问
                // System.out.println("播放电影....");
                response.setContentType("text/html;charset=utf-8");
                response.getWriter().write("播放电影....");
            }else{
                //盗链
                //System.out.println("想看电影吗？来优酷吧...");
                response.setContentType("text/html;charset=utf-8");
                response.getWriter().write("想看电影吗？来优酷吧...");
            }
        }
        DoHttpServletRequestData(request);  // this.doPost(request,response);

    }

    //通用方法
    void DoHttpServletRequestData(HttpServletRequest request)  {
        System.out.println("--------DoHttpServletRequestData---------");

        request.setCharacterEncoding("utf-8");  //解决post乱码输出问题

        /*
        *   获取请求参数通用方式：不论get还是post请求方式都可以使用下列方法来获取请求参数
			1. String getParameter(String name):根据参数名称获取参数值    username=zs&password=123
			2. String[] getParameterValues(String name):根据参数名称获取参数值的数组  hobby=xx&hobby=game
			3. Enumeration<String> getParameterNames():获取所有请求的参数名称
			4. Map<String,String[]> getParameterMap():获取所有参数的map集合
        */

        //根据参数名称获取参数值
        String username = request.getParameter("username");
        System.out.println(username);

        //根据参数名称获取参数值的数组
        //String[] hobbies = request.getParameterValues("hobby");
        /*for (String hobby : hobbies) {
            System.out.println(hobby);
        }*/

        //获取所有请求的参数名称
        Enumeration<String> parameterNames = request.getParameterNames();
        /*while(parameterNames.hasMoreElements()){
            String name = parameterNames.nextElement();
            System.out.println(name);
            String value = request.getParameter(name);
            System.out.println(value);
            System.out.println("----------------");
        }*/

        // 获取所有参数的map集合
        Map<String, String[]> parameterMap = request.getParameterMap();
        //遍历
        Set<String> keyset = parameterMap.keySet();
        for (String name : keyset) {

            //获取键获取值
            String[] values = parameterMap.get(name);
            System.out.println(name);
            for (String value : values) {
                System.out.println(value);
            }
            //System.out.println("-----------------");
        }
    }

}