源码提交

codes/TechSister/pom.xml

@@ -64,6 +64,47 @@
     <version>RELEASE</version>
     <scope>compile</scope>
 </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents.client5</groupId>
+            <artifactId>httpclient5</artifactId>
+            <version>5.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents.client5</groupId>
+            <artifactId>httpclient5-fluent</artifactId>
+            <version>5.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>5.0.0-alpha.2</version>
+        </dependency>
+        <dependency>
+            <groupId>com.dtflys.forest</groupId>
+            <artifactId>forest-core</artifactId>
+            <version>1.5.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>javax.xml.bind</groupId>
+            <artifactId>jaxb-api</artifactId>
+            <version>2.2.11</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.xml.bind</groupId>
+            <artifactId>jaxb-core</artifactId>
+            <version>2.2.11</version>
+        </dependency>
+        <dependency>
+            <groupId>com.sun.xml.bind</groupId>
+            <artifactId>jaxb-impl</artifactId>
+            <version>2.2.11</version>
+        </dependency>
+        <dependency>
+            <groupId>javax.activation</groupId>
+            <artifactId>activation</artifactId>
+            <version>1.1.1</version>
+        </dependency>
     </dependencies>
 
 <build>

codes/TechSister/src/main/java/com/itwanger/alibaba/Singleton.java

+package com.itwanger.alibaba;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public enum Singleton {
+    INSTANCE;
+}

codes/TechSister/src/main/java/com/itwanger/http/ForRestClient.java

+package com.itwanger.http;
+
+import com.dtflys.forest.annotation.Body;
+import com.dtflys.forest.annotation.Post;
+import com.dtflys.forest.annotation.Request;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public interface ForRestClient {
+    @Post("http://httpbin.org/post")
+    String simplePost(@Body("name") String name);
+}

codes/TechSister/src/main/java/com/itwanger/http/ForRestDemo.java

+package com.itwanger.http;
+
+import com.dtflys.forest.config.ForestConfiguration;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class ForRestDemo {
+    public static void main(String[] args) {
+        // 实例化Forest配置对象
+        ForestConfiguration configuration = ForestConfiguration.configuration();
+        configuration.setBackendName("httpclient");
+
+        // 通过Forest配置对象实例化Forest请求接口
+        ForRestClient myClient = configuration.createInstance(ForRestClient.class);
+
+        // 调用Forest请求接口，并获取响应返回结果
+        String result = myClient.simplePost("二哥");
+        System.out.println(result);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/http/HttpClientDemo.java

+package com.itwanger.http;
+
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class HttpClientDemo {
+    public static void main(String[] args) throws URISyntaxException {
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(new URI("https://httpbin.org/post"))
+                .headers("Content-Type", "text/plain;charset=UTF-8")
+                .POST(HttpRequest.BodyPublishers.ofString("二哥牛逼"))
+                .build();
+        client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                .thenApply(HttpResponse::body)
+                .thenAccept(System.out::println)
+                .join();
+    }
+}

codes/TechSister/src/main/java/com/itwanger/http/HttpComponentsDemo.java

+package com.itwanger.http;
+
+import org.apache.hc.client5.http.classic.methods.HttpPost;
+import org.apache.hc.client5.http.entity.UrlEncodedFormEntity;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.core5.http.HttpEntity;
+import org.apache.hc.core5.http.NameValuePair;
+import org.apache.hc.core5.http.ParseException;
+import org.apache.hc.core5.http.io.entity.EntityUtils;
+import org.apache.hc.core5.http.message.BasicNameValuePair;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class HttpComponentsDemo {
+    public static void main(String[] args) throws IOException, IOException, ParseException {
+        try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
+            HttpPost httpPost = new HttpPost("http://httpbin.org/post");
+            List<NameValuePair> nvps = new ArrayList<>();
+            nvps.add(new BasicNameValuePair("name", "二哥"));
+            httpPost.setEntity(new UrlEncodedFormEntity(nvps, Charset.forName("UTF-8")));
+
+            try (CloseableHttpResponse response2 = httpclient.execute(httpPost)) {
+                System.out.println(response2.getCode() + " " + EntityUtils.toString(response2.getEntity()));
+            }
+        }
+    }
+}

codes/TechSister/src/main/java/com/itwanger/http/HttpUrlConnectionDemo.java

+package com.itwanger.http;
+
+import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class HttpUrlConnectionDemo {
+    public static void main(String[] args) throws IOException {
+        String urlString = "https://httpbin.org/post";
+        String bodyString = "name=二哥";
+
+        URL url = new URL(urlString);
+        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
+        conn.setRequestMethod("POST");
+        conn.setDoOutput(true);
+
+        OutputStream os = conn.getOutputStream();
+        os.write(bodyString.getBytes("utf-8"));
+        os.flush();
+        os.close();
+
+        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
+            InputStream is = conn.getInputStream();
+            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
+            StringBuilder sb = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                sb.append(line);
+            }
+            System.out.println("响应内容:" + sb.toString());
+        } else {
+            System.out.println("响应码:" + conn.getResponseCode());
+        }
+    }
+}

codes/TechSister/src/main/java/com/itwanger/http/OkHttpPostDemo.java

+package com.itwanger.http;
+
+import java.io.IOException;
+import okhttp3.MediaType;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class OkHttpPostDemo {
+    public static final MediaType JSON = MediaType.get("application/json; charset=utf-8");
+
+    OkHttpClient client = new OkHttpClient();
+
+    String post(String url, String json) throws IOException {
+        RequestBody body = RequestBody.create(json, JSON);
+        Request request = new Request.Builder()
+                .url(url)
+                .post(body)
+                .build();
+        try (Response response = client.newCall(request).execute()) {
+            return response.body().string();
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        OkHttpPostDemo example = new OkHttpPostDemo();
+        String json = "{'name':'二哥'}";
+        String response = example.post("https://httpbin.org/post", json);
+        System.out.println(response);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/box/Test.java

+package com.itwanger.thirty.box;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class Test {
+    public static void main(String[] args) {
+        long t1 = System.currentTimeMillis();
+        long sum = 0L;
+        for (int i = 0; i < Integer.MAX_VALUE;i++) {
+            sum += i;
+        }
+        long t2 = System.currentTimeMillis();
+        System.out.println(t2-t1);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy1/TestClone.java

+package com.itwanger.thirty.copy1;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class TestClone {
+    public static void main(String[] args) throws CloneNotSupportedException {
+        Writer writer1 = new Writer(18,"二哥");
+        Writer writer2 = (Writer) writer1.clone();
+
+        System.out.println("浅拷贝后：");
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+
+        writer2.setName("三妹");
+
+        System.out.println("调整了 writer2 的 name 后：");
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy1/Writer.java

+package com.itwanger.thirty.copy1;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Writer implements Cloneable{
+    private int age;
+    private String name;
+
+    public Writer(int age, String name) {
+        this.age = age;
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) + "{" +
+                "age=" + age +
+                ", name='" + name + '\'' +
+                '}';
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy2/Book.java

+package com.itwanger.thirty.copy2;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Book {
+    private String bookName;
+    private int price;
+
+    public Book(String bookName, int price) {
+        this.bookName = bookName;
+        this.price = price;
+    }
+
+    public String getBookName() {
+        return bookName;
+    }
+
+    public void setBookName(String bookName) {
+        this.bookName = bookName;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " bookName='" + bookName + '\'' +
+                ", price=" + price +
+                '}';
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy2/TestClone.java

+package com.itwanger.thirty.copy2;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class TestClone {
+    public static void main(String[] args) throws CloneNotSupportedException {
+        Writer writer1 = new Writer(18,"二哥");
+        Book book1 = new Book("编译原理",100);
+        writer1.setBook(book1);
+
+        Writer writer2 = (Writer) writer1.clone();
+        System.out.println("浅拷贝后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+
+        Book book2 = writer2.getBook();
+        book2.setBookName("永恒的图灵");
+        book2.setPrice(70);
+        System.out.println("writer2.book 变更后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy2/Writer.java

+package com.itwanger.thirty.copy2;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Writer implements Cloneable{
+    private int age;
+    private String name;
+    private Book book;
+
+    public Writer(int age, String name) {
+        this.age = age;
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Book getBook() {
+        return book;
+    }
+
+    public void setBook(Book book) {
+        this.book = book;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " age=" + age +
+                ", name='" + name + '\'' +
+                ", book=" + book +
+                '}';
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+}
+

codes/TechSister/src/main/java/com/itwanger/thirty/copy3/Book.java

+package com.itwanger.thirty.copy3;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Book implements Cloneable{
+    private String bookName;
+    private int price;
+
+    public Book(String bookName, int price) {
+        this.bookName = bookName;
+        this.price = price;
+    }
+
+    public String getBookName() {
+        return bookName;
+    }
+
+    public void setBookName(String bookName) {
+        this.bookName = bookName;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " bookName='" + bookName + '\'' +
+                ", price=" + price +
+                '}';
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+}
+

codes/TechSister/src/main/java/com/itwanger/thirty/copy3/TestClone.java

+package com.itwanger.thirty.copy3;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class TestClone {
+    public static void main(String[] args) throws CloneNotSupportedException {
+        Writer writer1 = new Writer(18,"二哥");
+        Book book1 = new Book("编译原理",100);
+        writer1.setBook(book1);
+
+        Writer writer2 = (Writer) writer1.clone();
+        System.out.println("深拷贝后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+
+        Book book2 = writer2.getBook();
+        book2.setBookName("永恒的图灵");
+        book2.setPrice(70);
+        System.out.println("writer2.book 变更后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy3/Writer.java

+package com.itwanger.thirty.copy3;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Writer implements Cloneable{
+    private int age;
+    private String name;
+    private Book book;
+
+    public Writer(int age, String name) {
+        this.age = age;
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Book getBook() {
+        return book;
+    }
+
+    public void setBook(Book book) {
+        this.book = book;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " age=" + age +
+                ", name='" + name + '\'' +
+                ", book=" + book +
+                '}';
+    }
+
+    @Override
+    protected Object clone() throws CloneNotSupportedException {
+        Writer writer = (Writer) super.clone();
+        writer.setBook((Book) writer.getBook().clone());
+        return writer;
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy4/Book.java

+package com.itwanger.thirty.copy4;
+
+import java.io.Serializable;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Book implements Serializable {
+    private String bookName;
+    private int price;
+
+    public Book(String bookName, int price) {
+        this.bookName = bookName;
+        this.price = price;
+    }
+
+    public String getBookName() {
+        return bookName;
+    }
+
+    public void setBookName(String bookName) {
+        this.bookName = bookName;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " bookName='" + bookName + '\'' +
+                ", price=" + price +
+                '}';
+    }
+}
+

codes/TechSister/src/main/java/com/itwanger/thirty/copy4/TestClone.java

+package com.itwanger.thirty.copy4;
+
+import java.io.IOException;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class TestClone {
+    public static void main(String[] args) throws IOException, ClassNotFoundException {
+        Writer writer1 = new Writer(18,"二哥");
+        Book book1 = new Book("编译原理",100);
+        writer1.setBook(book1);
+
+        Writer writer2 = (Writer) writer1.deepClone();
+        System.out.println("深拷贝后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+
+        Book book2 = writer2.getBook();
+        book2.setBookName("永恒的图灵");
+        book2.setPrice(70);
+        System.out.println("writer2.book 变更后：");
+
+        System.out.println("writer1：" + writer1);
+        System.out.println("writer2：" + writer2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirty/copy4/Writer.java

+package com.itwanger.thirty.copy4;
+
+import java.io.*;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class Writer implements Serializable {
+    private int age;
+    private String name;
+    private Book book;
+
+    public Writer(int age, String name) {
+        this.age = age;
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Book getBook() {
+        return book;
+    }
+
+    public void setBook(Book book) {
+        this.book = book;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString().substring(26) +
+                " age=" + age +
+                ", name='" + name + '\'' +
+                ", book=" + book +
+                '}';
+    }
+
+    //深度拷贝
+    public Object deepClone() throws IOException, ClassNotFoundException {
+        // 序列化
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        ObjectOutputStream oos = new ObjectOutputStream(bos);
+
+        oos.writeObject(this);
+
+        // 反序列化
+        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
+        ObjectInputStream ois = new ObjectInputStream(bis);
+
+        return ois.readObject();
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyfive/StringInternDemo.java

+package com.itwanger.thirtyfive;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class StringInternDemo {
+    public static void main(String[] args) {
+String s1 = new String("二哥") + new String("三妹");
+String s2 = s1.intern();
+System.out.println(s1 == s2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyfive/StringInternDemo1.java

+package com.itwanger.thirtyfive;
+
+import java.util.Random;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class StringInternDemo1 {
+    static final int MAX = 1000 * 10000;
+    static final String[] arr = new String[MAX];
+
+    public static void main(String[] args) throws Exception {
+        Integer[] DB_DATA = new Integer[10];
+        Random random = new Random(10 * 10000);
+        for (int i = 0; i < DB_DATA.length; i++) {
+            DB_DATA[i] = random.nextInt();
+        }
+        long t = System.currentTimeMillis();
+        for (int i = 0; i < MAX; i++) {
+            arr[i] = new String(String.valueOf(DB_DATA[i % DB_DATA.length]));
+        }
+
+        System.out.println((System.currentTimeMillis() - t) + "ms");
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyfive/StringInternDemo2.java

+package com.itwanger.thirtyfive;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class StringInternDemo2 {
+    public static void main(String[] args) {
+String s1 = new String("二哥三妹");
+String s2 = s1.intern();
+System.out.println(s1 == s2);
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyone/PrimitiveTypeDemo.java

+package com.itwanger.thirtyone;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class PrimitiveTypeDemo {
+    public static void main(String[] args) {
+        int age = 18;
+        modify(age);
+        System.out.println(age);
+    }
+
+    private static void modify(int age1) {
+        age1 = 30;
+    }
+
+}

codes/TechSister/src/main/java/com/itwanger/thirtyone/PrimitiveTypeDemo1.java

+package com.itwanger.thirtyone;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class PrimitiveTypeDemo1 {
+    public static void main(String[] args) {
+        int age = 18;
+        age = modify(age);
+        System.out.println(age);
+    }
+
+    private static int modify(int age1) {
+        age1 = 30;
+        return age1;
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyone/ReferenceTypeDemo.java

+package com.itwanger.thirtyone;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+class ReferenceTypeDemo {
+    public static void main(String[] args) {
+        String name = "二哥";
+        modify(name);
+        System.out.println(name);
+    }
+
+    private static void modify(String name1) {
+        name1 = "三妹";
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtyone/Test.java

+package com.itwanger.thirtyone;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class Test {
+    public static void main(String[] args) {
+int age = 18;
+String name = "二哥";
+    }
+}

codes/TechSister/src/main/java/com/itwanger/thirtythree/StringTest.java

+package com.itwanger.thirtythree;
+
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class StringTest {
+
+    public void test() {
+        int i = 8;
+        while ((i -= 3) > 0);
+        System.out.println("i = " + i);
+    }
+
+    public static void main(String[] args) {
+        StringTest hello = new StringTest();
+        for (int i = 0; i < 50_000; i++) {
+            hello.test();
+        }
+    }
+
+}

codes/TechSister/src/main/java/com/itwanger/twentyeight/Test.java

+package com.itwanger.twentyeight;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * @author 微信搜「沉默王二」，回复关键字 Java
+ */
+public class Test {
+    ArrayList a;
+}