SDN期末作业验收

SDN期末作业验收

参考场景一

搭建的拓扑图：

负载均衡程序

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;

import net.sf.json.*;
public class Main {
    public static JSONObject jsonObject = null;
    public static JSONObject[] jsonArray = new  JSONObject[100];
    static String url24= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/0";
    static String url14= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1";
    static String url21= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/0";
    static String url12= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1";

    public static JSONObject httpRequest(String requestUrl, String requestMethod,int index) {
        StringBuffer buffer = new StringBuffer();
        try {

            URL url = new URL(requestUrl);
            // http协议传输
            HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            
            String userPassword = "admin" + ":" + "admin";
            String encoding =  Base64.getEncoder().encodeToString((userPassword).getBytes());
            httpUrlConn.setRequestProperty("Authorization", "Basic " + encoding); 
            
            httpUrlConn.setRequestProperty("Connection", "Keep-Alive"); // 设置维持长连接
            httpUrlConn.setRequestProperty("Charset", "UTF-8");// 设置文件字符集:
            
            
            // 设置请求方式（GET/POST）
            httpUrlConn.setRequestMethod(requestMethod);

            if ("GET".equalsIgnoreCase(requestMethod))
            {
                httpUrlConn.connect();
                // 将返回的输入流转换成字符串
                InputStream inputStream = httpUrlConn.getInputStream();
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                String str = null;
                while ((str = bufferedReader.readLine()) != null) {
                    buffer.append(str);
                }
                
                bufferedReader.close();
                inputStreamReader.close();
                // 释放资源
                inputStream.close();
                inputStream = null;
                httpUrlConn.disconnect();
                jsonObject = JSONObject.fromObject(buffer.toString());
              //  System.out.println(buffer.toString());
                
            }else if("PUT".equalsIgnoreCase(requestMethod)){
                byte[] data = (jsonArray[index].toString()).getBytes();//转换为字节数组
                httpUrlConn.setRequestProperty("Content-Length", String.valueOf(data.length));// 设置文件长度
                httpUrlConn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
             // 开始连接请求
                httpUrlConn.connect();
                OutputStream  out = httpUrlConn.getOutputStream();   
             // 写入请求的字符串
                out.write((jsonArray[index].toString()).getBytes());
                out.flush();
                out.close();
                if (httpUrlConn.getResponseCode() == 200) {  
                    System.out.println("发送成功");
                }
                
            }else if("DELETE".equalsIgnoreCase(requestMethod)){
                
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return jsonObject;
    }
    public static void init() throws IOException{
        String s = null;
        int i = 0;
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("DATA.txt"),"UTF-8"));
            while((s = br.readLine())!=null){
                jsonArray[i] = JSONObject.fromObject(s);
                i++;
            }
            String url31= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:3/flow-node-inventory:table/0/flow/0";
            String url32= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:3/flow-node-inventory:table/0/flow/1";
            String url11= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/0";
            String url22= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/1";
            String url13= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/2";
            String url23= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/2";
            String url33= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:3/flow-node-inventory:table/0/flow/2";
            httpRequest(url31,"PUT",0);
            httpRequest(url32,"PUT",1);
            httpRequest(url21,"PUT",2);
            httpRequest(url11,"PUT",3);
            httpRequest(url12,"PUT",4);
            httpRequest(url22,"PUT",5);
            httpRequest(url13,"PUT",6);
            httpRequest(url23,"PUT",7);
            httpRequest(url33,"PUT",10);
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public static int getReceived(String url2){
         jsonObject =  httpRequest(url2,"GET",0);
            JSONArray j1 = (JSONArray) jsonObject.get("node-connector");
            JSONObject j2 = (JSONObject) j1.get(0);
            JSONObject j3 =  (JSONObject) j2.get("opendaylight-port-statistics:flow-capable-node-connector-statistics");
            JSONObject j4 =  (JSONObject)j3.get("bytes");
            int received = (int) j4.get("received");
            return received;
    }
    public static void main(String[] args) {
        System.out.println("-------------------------------------------------");
        try {
            init();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String s = "";
        String url = "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:3/flow-node-inventory:table/0/flow/1";
        String url1= "http://172.17.172.244:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:2/flow-node-inventory:table/0/flow/0";
        String url2 = "http://172.17.172.244:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:2/node-connector/openflow:2:2";
//       jsonObject =  httpRequest(url2,"GET",0);
//      System.out.println(jsonObject.toString());
        int received ;
        int temp = 0;
        while(true){
            received = getReceived(url2);
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
            System.out.println(received-temp);
                                //这里我们去判断S2交换机通过包的增长数量来选择路径，实现负载均衡
            if(received-temp<10000){
                //下负载均衡流表
                httpRequest(url24,"PUT",8);
                httpRequest(url14,"PUT",9);
            }else if(received-temp>10000 ){
                httpRequest(url21,"PUT",2);
                httpRequest(url12,"PUT",4);
            }
            temp = received;
        }
        
//      jsonObject =  httpRequest(url1,"PUT");
        
        
        
    }
}

演示视频

https://pan.baidu.com/s/1htkKLPM

程序分工

在最后的这次作业中主要负责查找相关的资料，以及辅助部分代码的编写

课程总结

这学期的SDN这门课对我来说，让我对现在网络前沿的发展方向有了一个大体的认识。在平时的上课与作业中学会了建立结构比较简单的拓扑，以及用python模仿编写的脚本来建立拓扑图。另外，还学会了利用ODL下发流表，不得不说我从中收获了很多。