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hellokatonhellokaton
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🍱 add java8 growing code
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‎README.md‎

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@@ -20,7 +20,7 @@ java 8 改变了我们思考和编码的方式，在这里你会看到很多关
2020
| 课时数 | 课时标题 | 在线播放 | 源码位置 |
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|:-----:|:--------|:-------|:-------|
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|第 1 课 | 课程介绍 | [哔哩哔哩](https://www.bilibili.com/video/av19287893) ¦ [Youtube](https://youtu.be/GsFPVjiUpdU) | 无 |
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|第 2 课 | Java 8 的发展 | [哔哩哔哩]() ¦ [Youtube]() | 无 |
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|第 2 课 | Java 8 的发展 | [哔哩哔哩]() ¦ [Youtube]() | [java8-growing](https://github.com/biezhi/learn-java8/tree/master/java8-growing/src/main/java/io/github/biezhi/java8/growing) |
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|第 3 课 | 理解 lambda | 哔哩哔哩 ¦ Youtube | |
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|第 4 课 | 初尝 lambda | 哔哩哔哩 ¦ Youtube | |
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|第 5 课 | 默认方法的妙用 | 哔哩哔哩 ¦ Youtube | |

‎java8-growing/src/main/java/io/github/biezhi/java8/growing/jdk6/CompilerAPI.java‎

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package io.github.biezhi.java8.growing.jdk6;
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import javax.tools.*;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.lang.reflect.Method;
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import java.net.URI;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.List;
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/**
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* 使用Compiler API
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*/
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public class CompilerAPI {
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public static void main(String[] args) throws Exception {
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String program = "" +
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"public class LearnJava6 {\n" +
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" public static void main(String[] args) {\n" +
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" System.out.println(\"欢迎你学习跟上 Java 8 之 CompilerAPI!\");\n" +
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" }\n" +
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"}\n";
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JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
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JavaFileObject compilationUnit =
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new StringJavaFileObject("LearnJava6", program);
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SimpleJavaFileManager fileManager =
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new SimpleJavaFileManager(compiler.getStandardFileManager(null, null, null));
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JavaCompiler.CompilationTask compilationTask = compiler.getTask(
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null, fileManager, null, null, null, Arrays.asList(compilationUnit));
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compilationTask.call();
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CompiledClassLoader classLoader =
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new CompiledClassLoader(fileManager.getGeneratedOutputFiles());
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Class<?> codeGenTest = classLoader.loadClass("LearnJava6");
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Method main = codeGenTest.getMethod("main", String[].class);
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main.invoke(null, new Object[]{null});
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}
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private static class StringJavaFileObject extends SimpleJavaFileObject {
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private final String code;
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public StringJavaFileObject(String name, String code) {
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super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension),
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Kind.SOURCE);
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this.code = code;
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}
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@Override
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public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
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return code;
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}
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}
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private static class ClassJavaFileObject extends SimpleJavaFileObject {
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private final ByteArrayOutputStream outputStream;
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private final String className;
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protected ClassJavaFileObject(String className, Kind kind) {
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super(URI.create("mem:///" + className.replace('.', '/') + kind.extension), kind);
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this.className = className;
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outputStream = new ByteArrayOutputStream();
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}
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@Override
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public OutputStream openOutputStream() throws IOException {
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return outputStream;
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}
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public byte[] getBytes() {
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return outputStream.toByteArray();
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}
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public String getClassName() {
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return className;
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}
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}
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private static class SimpleJavaFileManager extends ForwardingJavaFileManager {
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private final List<ClassJavaFileObject> outputFiles;
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protected SimpleJavaFileManager(JavaFileManager fileManager) {
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super(fileManager);
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outputFiles = new ArrayList<ClassJavaFileObject>();
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}
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@Override
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public JavaFileObject getJavaFileForOutput(Location location, String className, JavaFileObject.Kind kind, FileObject sibling) throws IOException {
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ClassJavaFileObject file = new ClassJavaFileObject(className, kind);
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outputFiles.add(file);
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return file;
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}
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public List<ClassJavaFileObject> getGeneratedOutputFiles() {
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return outputFiles;
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}
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}
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private static class CompiledClassLoader extends ClassLoader {
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private final List<ClassJavaFileObject> files;
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private CompiledClassLoader(List<ClassJavaFileObject> files) {
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this.files = files;
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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Iterator<ClassJavaFileObject> itr = files.iterator();
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while (itr.hasNext()) {
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ClassJavaFileObject file = itr.next();
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if (file.getClassName().equals(name)) {
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itr.remove();
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byte[] bytes = file.getBytes();
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return super.defineClass(name, bytes, 0, bytes.length);
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}
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}
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return super.findClass(name);
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}
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}
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}

‎java8-growing/src/main/java/io/github/biezhi/java8/growing/jdk6/Console.java‎

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package io.github.biezhi.java8.growing.jdk6;
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/**
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* 用Console开发控制台程序
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*/
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public class Console {
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public static void main(String[] args) {
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java.io.Console console = System.console();
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if (console != null) {
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String user = new String(console.readLine(" Enter User: ", new Object[0]));
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String pwd = new String(console.readPassword(" Enter Password: ", new Object[0]));
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console.printf(" User name is:%s ", new Object[]{user});
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console.printf(" Password is:%s ", new Object[]{pwd});
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} else {
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System.out.println(" No Console! ");
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}
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}
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}

‎java8-growing/src/main/java/io/github/biezhi/java8/growing/jdk6/DesktopTray.java‎

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package io.github.biezhi.java8.growing.jdk6;
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/**
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* Desktop类和SystemTray类
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*
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* https://www.programcreek.com/java-api-examples/java.awt.Desktop
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*
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*/
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public class DesktopTray {
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}

‎java8-growing/src/main/java/io/github/biezhi/java8/growing/jdk6/HttpServerAPI.java‎

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package io.github.biezhi.java8.growing.jdk6;
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import com.sun.net.httpserver.HttpExchange;
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import com.sun.net.httpserver.HttpHandler;
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import com.sun.net.httpserver.HttpServer;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.InetSocketAddress;
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public class HttpServerAPI {
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private static int count = 0;
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static class MyHandler implements HttpHandler {
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@Override
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public void handle(HttpExchange he) throws IOException {
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System.out.println("Request " + count++);
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System.out.println(he.getHttpContext().getPath());
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InputStream is = he.getRequestBody();
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String response = "<font color='red'>Lets Learn Java8.</font>";
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he.sendResponseHeaders(200, response.length());
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OutputStream os = he.getResponseBody();
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os.write(response.getBytes());
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os.close();
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}
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}
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public static void main(String[] args) {
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try {
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HttpServer hs = HttpServer.create(new InetSocketAddress(8080), 0);
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hs.createContext("/", new MyHandler());
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hs.createContext("/java", new MyHandler());
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hs.setExecutor(null);
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hs.start();
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System.out.println("---begin---");
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System.out.println("Listening on " + hs.getAddress());
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} catch (IOException ioe) {
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ioe.printStackTrace();
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}
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}
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}

‎java8-growing/src/main/java/io/github/biezhi/java8/growing/jdk6/ScriptEngineDemo.java‎

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package io.github.biezhi.java8.growing.jdk6;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import java.io.FileReader;
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/**
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* 对脚本语言的支持
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*/
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public class ScriptEngineDemo {
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public static void main(String[] args) {
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ScriptEngineManager manager = new ScriptEngineManager();
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ScriptEngine engine = manager.getEngineByName("ECMAScript");
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try {
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String jsPath = ScriptEngineDemo.class.getResource("/test.js").getPath();
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engine.eval(new FileReader(jsPath));
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Invocable invokableEngine = (Invocable) engine;
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Object ret = invokableEngine.invokeFunction("test", null);
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System.out.println("The result is : " + ret);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎java8-growing/src/main/resources/test.js‎

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function test(){
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return Math.round( 11.2 );
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}

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