需求
在java中httpServer是非常普遍的一個功能,前端送出請求,後端根據url 以及參數做出相應的處理,傳回資料,有get請求 post請求。
現在我需要flink實作這樣的功能,http請求flink的source,sink進行處理并傳回結果
最終實作結果截圖如下
實作代碼如下
Job代碼
package Job;
import flink.HttpSource;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Job {
public static Logger logger = LoggerFactory.getLogger(Job.class);
public static void main(String[] args) throws Exception {
//1、擷取流處理的環境
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
env.setParallelism(1);
DataStreamSource source = env.addSource(new HttpSource());
source.addSink(new Sink());
env.execute("http計算");
}
}
HttpSource代碼
監聽端口資料
package flink;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.source.RichParallelSourceFunction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
public class HttpSource extends RichParallelSourceFunction<String> {
public static ServerSocket serverSocket = null;
public static Socket socket = null;
public static BufferedReader bufferedReader =null;
public static Logger logger = LoggerFactory.getLogger(HttpSource.class);
@Override
public void open(Configuration parameters) throws Exception {
int port = 8200;
try {
//1、開啟端口
serverSocket = new ServerSocket(port);
} catch (IOException e) {
logger.error("open port error "+e.getMessage());
}
}
@Override
public void run(SourceContext<String> ctx) throws Exception {
while (true) {
try {
logger.info("serverSocket accept ");
socket = serverSocket.accept();
logger.info("serverSocket bufferedReader ");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(socket.getInputStream()));//擷取輸入流(請求)
StringBuilder stringBuilder = new StringBuilder();
String line = null;
Thread.sleep(500);
//得到請求的内容,注意這裡作兩個判斷非空和""都要,隻判斷null會有問題
logger.info("serverSocket readLine ");
while ((line = bufferedReader.readLine()) != null && !line.equals("")) {
stringBuilder.append(line);
}
//過濾掉某些請求頭之類的
String result = stringBuilder.toString().split(" ")[1];
ctx.collect(result);
} catch (Exception e) {
logger.error("HttpSource "+e.getMessage());
continue;
}finally {
if(bufferedReader!=null){
bufferedReader.close();
}
}
}
}
@Override
public void cancel() {
}
}
注意一個地方
正常情況下,前端進行請求,會傳回請求方式 請求路徑以及請求參數 後面會有浏覽器整個資訊,非常多,我這裡做了處理,隻擷取請求路徑以及請求參數
Sink類
package Job;
import Server.httpRequest;
import Server.httpResponse;
import com.alibaba.fastjson.JSONObject;
import flink.HttpSource;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Sink extends RichSinkFunction<String> {
public static Logger logger=LoggerFactory.getLogger(Sink.class);
public void open(Configuration parameters){
}
@Override
public void invoke(String result, Context context){
//1、處理資料,過濾幹擾因素 /hello?name=dde
JSONObject jsonObject = new httpRequest().analysisContent(result);
//2、擷取url
if(jsonObject.containsKey("url")){
//3、根據不同的url做出不同的處理
if(jsonObject.getString("url").equals("/sub")){
if(jsonObject.containsKey("params")){
System.out.println("hello "+result);
new httpResponse().sendsg(HttpSource.socket,jsonObject.getJSONObject("params"));
}
}
if(jsonObject.getString("url").equals("/add")){
if(jsonObject.containsKey("params")){
System.out.println("fail "+result);
new httpResponse().sendsg1(HttpSource.socket,jsonObject.getJSONObject("params"));
}
}
}
}
}
對不同的url進行不同的處理 httpResponse類
package Server;
import com.alibaba.fastjson.JSONObject;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
public class httpResponse {
public void sendsg(Socket socket, JSONObject msg){
PrintWriter printWriter = null;//這裡第二個參數表示自動重新整理緩存
try {
printWriter = new PrintWriter(
socket.getOutputStream(), true);
} catch (IOException e) {
System.out.println(""+e.getMessage());
}
printWriter.println("HTTP/1.1 200 OK");
printWriter.println("Content-Type:text/html;charset=utf-8");
printWriter.println();
float a=0;
float b=0;
float c=0;
if(msg.containsKey("a")){
a= msg.getFloat("a");
}
if(msg.containsKey("b")){
b= msg.getFloat("b");
}
if(msg.containsKey("c")){
c=msg.getFloat("c");
}
c=a*2+b-c;
printWriter.write(c+"");//将日志輸出到浏覽器
printWriter.close();
}
public void sendsg1(Socket socket, JSONObject msg){
PrintWriter printWriter = null;//這裡第二個參數表示自動重新整理緩存
try {
printWriter = new PrintWriter(
socket.getOutputStream(), true);
} catch (IOException e) {
System.out.println(""+e.getMessage());
}
printWriter.println("HTTP/1.1 200 OK");
printWriter.println("Content-Type:text/html;charset=utf-8");
printWriter.println();
float a=0;
float b=0;
float c=0;
if(msg.containsKey("a")){
a= msg.getFloat("a");
}
if(msg.containsKey("b")){
b= msg.getFloat("b");
}
if(msg.containsKey("c")){
c=msg.getFloat("c");
}
c=a+b+c;
printWriter.write(c+"");//将日志輸出到浏覽器
printWriter.close();
}
}
對擷取的參數進行過濾篩選
package Server;
import com.alibaba.fastjson.JSONObject;
public class httpRequest {
public JSONObject analysisContent(String result){
JSONObject obj=new JSONObject();
//1、過濾隻留下url 和請求參數 值
String [] contents=result.split("\\?");
if(contents.length>1){
obj.put("url",contents[0]);
JSONObject keyObject=new JSONObject();
String [] params=contents[1].split("&");
for(int i=0;i<params.length;i++){
String [] map= params[i].split("=");
keyObject.put(map[0],map[1]);
}
obj.put("params",keyObject);
}
return obj;
}
}
打包成jar包
在flink上運作
測試運作15m以後是否有效
不同的url傳回不同的處理結果,完美
感想
很早接觸flink 非常的排斥,然後很多都是借用工具的,如果沒有開發好的輪子,需要自己造的,就會非常排斥,比如這個功能,我就搞了很久,之前搞的版本是springboot+flink的方式,純jar包,脫離了叢集,我感覺那種方式跟搞着玩一樣。
昨天看了一篇文章窮爸爸富爸爸,講了窮人思維,突然覺得自己有必要思考,結果2h不到,就搞出來了,改變思維方式,不然會越忙越窮