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kimmkingkimmking
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‎01jvm/GCLogAnalysis.java‎

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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.LongAdder;
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/*
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演示GC日志生成与解读
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*/
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public class GCLogAnalysis {
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private static Random random = new Random();
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public static void main(String[] args) {
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// 当前毫秒时间戳
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long startMillis = System.currentTimeMillis();
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// 持续运行毫秒数; 可根据需要进行修改
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long timeoutMillis = TimeUnit.SECONDS.toMillis(1);
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// 结束时间戳
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long endMillis = startMillis + timeoutMillis;
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LongAdder counter = new LongAdder();
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System.out.println("正在执行...");
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// 缓存一部分对象; 进入老年代
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int cacheSize = 2000;
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Object[] cachedGarbage = new Object[cacheSize];
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// 在此时间范围内,持续循环
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while (System.currentTimeMillis() < endMillis) {
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// 生成垃圾对象
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Object garbage = generateGarbage(100*1024);
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counter.increment();
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int randomIndex = random.nextInt(2 * cacheSize);
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if (randomIndex < cacheSize) {
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cachedGarbage[randomIndex] = garbage;
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}
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}
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System.out.println("执行结束!共生成对象次数:" + counter.longValue());
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}
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// 生成对象
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private static Object generateGarbage(int max) {
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int randomSize = random.nextInt(max);
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int type = randomSize % 4;
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Object result = null;
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switch (type) {
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case 0:
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result = new int[randomSize];
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break;
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case 1:
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result = new byte[randomSize];
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break;
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case 2:
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result = new double[randomSize];
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break;
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default:
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StringBuilder builder = new StringBuilder();
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String randomString = "randomString-Anything";
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while (builder.length() < randomSize) {
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builder.append(randomString);
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builder.append(max);
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builder.append(randomSize);
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}
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result = builder.toString();
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break;
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}
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return result;
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}
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}

‎01jvm/环境准备.txt‎

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## Windows
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1.管理员身份打开powershell
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2.运行
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Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
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3.执行choco install superbenchmarker
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4.输入 sb
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执行 sb -u http://localhost:8088/api/hello -c 20 -N 60
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## Mac
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1.执行brew install wrk
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如果显式brew update很慢，可以ctrl+C打断更新
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2.输入 wrk
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执行 wrk -t8 -c40 -d60s http://localhost:8088/api/hello
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## 压测程序
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1.可以从github获取
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git clone https://github.com/kimmking/atlantis
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cd atlantis\gateway-server
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mvn clean package
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然后在target目录可以找到gateway-server-0.0.1-SNAPSHOT.jar
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2.也可以从此处下载已经编译好的：
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链接：https://pan.baidu.com/s/1NbpYX4M3YKLYM1JJeIzgSQ
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提取码：sp85
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java -jar -Xmx512m -Xms512 gateway-server-0.0.1-SNAPSHOT.jar
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‎02nio/nio01/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>java0.nio01</groupId>
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<artifactId>nio01</artifactId>
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<version>1.0</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎02nio/nio01/src/main/java/java0/nio01/HttpServer01.java‎

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package java0.nio01;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.ServerSocket;
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import java.net.Socket;
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public class HttpServer01 {
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public static void main(String[] args) throws IOException{
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ServerSocket serverSocket = new ServerSocket(8801);
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while (true) {
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try {
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Socket socket = serverSocket.accept();
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service(socket);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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private static void service(Socket socket) {
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try {
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Thread.sleep(20);
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PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
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printWriter.println("HTTP/1.1 200 OK");
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printWriter.println("Content-Type:text/html;charset=utf-8");
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String body = "hello,nio";
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printWriter.println("Content-Length:" + body.getBytes().length);
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printWriter.println();
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printWriter.write(body);
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printWriter.close();
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socket.close();
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} catch (IOException | InterruptedException e) {
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e.printStackTrace();
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}
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}
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}

‎02nio/nio01/src/main/java/java0/nio01/HttpServer02.java‎

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package java0.nio01;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.ServerSocket;
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import java.net.Socket;
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public class HttpServer02 {
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public static void main(String[] args) throws IOException{
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ServerSocket serverSocket = new ServerSocket(8802);
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while (true) {
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try {
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final Socket socket = serverSocket.accept();
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new Thread(() -> {
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service(socket);
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}).start();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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private static void service(Socket socket) {
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try {
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Thread.sleep(20);
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PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
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printWriter.println("HTTP/1.1 200 OK");
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printWriter.println("Content-Type:text/html;charset=utf-8");
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String body = "hello,nio";
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printWriter.println("Content-Length:" + body.getBytes().length);
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printWriter.println();
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printWriter.write(body);
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printWriter.close();
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socket.close();
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} catch (IOException | InterruptedException e) {
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e.printStackTrace();
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}
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}
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}

‎02nio/nio01/src/main/java/java0/nio01/HttpServer03.java‎

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package java0.nio01;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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public class HttpServer03 {
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public static void main(String[] args) throws IOException{
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ExecutorService executorService = Executors.newFixedThreadPool(40);
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final ServerSocket serverSocket = new ServerSocket(8803);
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while (true) {
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try {
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final Socket socket = serverSocket.accept();
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executorService.execute(() -> service(socket));
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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private static void service(Socket socket) {
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try {
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Thread.sleep(20);
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PrintWriter printWriter = new PrintWriter(socket.getOutputStream(), true);
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printWriter.println("HTTP/1.1 200 OK");
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printWriter.println("Content-Type:text/html;charset=utf-8");
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String body = "hello,nio";
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printWriter.println("Content-Length:" + body.getBytes().length);
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printWriter.println();
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printWriter.write(body);
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printWriter.close();
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socket.close();
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} catch (IOException | InterruptedException e) {
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e.printStackTrace();
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}
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}
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}

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