package king.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLDecoder;
import java.util.Date;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 用于接受所有http形式的请求,并把接受到的request中param及getInputStream全打印出来
 * @author King
 *
 */
public class HttpRequestServlet  extends HttpServlet{
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        try {
            request.setCharacterEncoding("UTF-8");
            response.setCharacterEncoding("UTF-8");
            System.err.println("我是服务器,通过request.getParameter()获取的参数:");
            StringBuilder paramSB = new StringBuilder();
            Enumeration<?> paramNames=request.getParameterNames();
            while(paramNames.hasMoreElements()){
                String name=(String)paramNames.nextElement();
                String valueNotDecode=request.getParameter(name);
                String valueDecode=new String(valueNotDecode.getBytes("UTF-8"),"UTF-8");
                paramSB.append(name + "==" + valueDecode+"\n");
            }
            System.out.println("我是服务器,通过param读取的参数如下:\n"+paramSB.toString());
            PrintWriter writer = response.getWriter();  
            writer.write("通过param读取的参数如下:\n"+paramSB.toString());  
            writer.flush();  
            writer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        try {
            request.setCharacterEncoding("UTF-8");
            response.setCharacterEncoding("UTF-8");
//            如果"您的文本内容" 用UTF-8编码后,再以conn.setRequestProperty("content-type", "text/xml;charset=iso-8859-1");发送到本服务端,那么需要对参数内容进行如下解码
//            String name = new String(request.getParameter("name").getBytes("iso-8859-1"),"UTF-8");
//            System.out.println("name : "+ name);
        
            System.err.println("我是服务器,通过request.getParameter()获取的参数:");
            StringBuilder paramSB = new StringBuilder();
            Enumeration<?> paramNames=request.getParameterNames();
            while(paramNames.hasMoreElements()){
                String name=(String)paramNames.nextElement();
                String valueNotDecode=request.getParameter(name);
                String valueDecode=new String(valueNotDecode.getBytes("iso-8859-1"),"UTF-8");
                System.out.println(name + "==" + valueDecode);
                paramSB.append(name + "==" + valueDecode+"\n");
            }
            
            //使用apache的httpcomponents 的post请求时:formparams.add(new BasicNameValuePair("key","value"));  也只能从这里获取到!
            BufferedReader br = new BufferedReader(new InputStreamReader(request.getInputStream(),"UTF-8")); 
            String line = null;
            StringBuilder streamSB = new StringBuilder();
            while ((line = br.readLine()) != null) {
                streamSB.append(line);
            }
            String decode = URLDecoder.decode(streamSB.toString(), "UTF-8");
            System.out.println("我是服务器,通过request.getInputStream()读取的参数:\n" + decode);
            
            response.setCharacterEncoding("UTF-8");//第一优先级高于第二优先级,只能用来设置out输出流中所采用的编码
//            response.setContentType("text/html;charset=UTF-8");//第二优先级,不仅能用来设置out输出流中所采用的编码,也可以设置浏览器接收到这些字符后以什么编码方式来解码
            PrintWriter writer = response.getWriter();  
            writer.write("通过param读取的参数如下:\n"+paramSB.toString());  
            writer.write("通过stream读取的参数如下:\n"+decode);  
            writer.flush(); 
            writer.close();    
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 客户端通过conn.setRequestProperty(key,value),
     * 即可在服务端通过request.getHeader(key)获取到对应的head协议头值
     * @param request
     * @param response
     * @throws Exception
     */
    public void tip(HttpServletRequest request, HttpServletResponse response) throws Exception{
        //在客户端用
        HttpURLConnection conn = (HttpURLConnection) new URL("http://localhost:8080/httpserver").openConnection();
        conn.setRequestProperty("Accept", "application/soap+xml, application/dime, multipart/related, text/*");
        //就能在本服务端用
        request.getHeader("Accept");//获取到Head协议头中的值.
    }
}