Initial commit

.gitattributes

+# Treat all files in this repo as binary, with no git magic updating
+# line endings. Windows users contributing to Go will need to use a
+# modern version of git and editors capable of LF line endings.
+#
+# We'll prevent accidental CRLF line endings from entering the repo
+# via the git-review gofmt checks.
+#
+# See golang.org/issue/9281
+
+* -text

.gitignore

+svn/
+target/
+test-output/
+*.class
+.classpath
+.project
+.settings/
+tmp
+temp
+*.log
+antx.properties
+.idea/
+*.iml
+htdocs
+package-info.java
+.DS_Store
+*.tar.gz
+docker/data/
+./mp3
\ No newline at end of file

SETUP-CENTOS.md

+# CentOS
+
+Java下载
+------
+<pre>
+https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
+
+Linux x64 Compressed Archive | jdk-8u261-linux-x64.tar.gz
+</pre>
+
+Java安装
+------
+<pre>
+cd /usr/local
+
+mkdir java
+
+cd java
+
+拷贝 jdk-8u261-linux-x64.tar.gz 到 /usr/local/java
+
+tar -xzvf jdk-8u261-linux-x64.tar.gz
+
+mv jdk1.8.0_261 jdk1.8
+</pre>
+
+Java环境变量
+------
+<pre>
+sudo vim /etc/profile
+
+export JAVA_HOME=/usr/local/java/jdk1.8
+export JRE_HOME=${JAVA_HOME}/jre
+export PATH=$PATH:${JAVA_HOME}/bin:${JRE_HOME}/bin
+export CLASSPATH=.:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar:${JRE_HOME}/lib
+
+source /etc/profile
+</pre>
+
+Java命令
+------
+<pre>
+ln -s /usr/local/java/jdk1.8/bin/java /usr/bin/java
+</pre>
+
+Maven
+------
+<pre>
+http://maven.apache.org/download.cgi
+
+下载 Binary tar.gz archive | apache-maven-3.6.3-bin.tar.gz
+
+tar -xzvf apache-maven-{版本}-bin.tar.gz
+</pre>
+
+Maven环境变量
+------
+<pre>
+sudo vim /etc/profile
+
+export MVN_HOME=Gz解压目录/apache-maven-{版本}
+export PATH=$PATH:${MVN_HOME}/bin
+
+source /etc/profile
+</pre>

SETUP-MAC.md

+# MacOS
+
+Java下载
+------
+<pre>
+https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
+
+macOS x64 | jdk-8u261-macosx-x64.dmg
+</pre>
+
+Java安装
+------
+<pre>
+双击，下一步...
+</pre>
+
+查看JavaHome目录
+------
+<pre>
+/usr/libexec/java_home -V
+</pre>
+
+Java环境变量
+------
+<pre>
+sudo vim /etc/profile
+
+export JAVA_HOME=JavaHome目录
+export JRE_HOME=${JAVA_HOME}/jre
+export PATH=$PATH:${JAVA_HOME}/bin:${JRE_HOME}/bin
+export CLASSPATH=.:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar:${JRE_HOME}/lib
+
+source /etc/profile
+</pre>
+
+Maven
+------
+<pre>
+http://maven.apache.org/download.cgi
+
+下载 Binary zip archive | apache-maven-3.6.3-bin.zip
+
+解压
+</pre>
+
+Maven环境变量
+------
+<pre>
+sudo vim ~/.bash_profile
+
+export MVN_HOME=Zip解压目录/apache-maven-{版本}
+export PATH=$PATH:${MVN_HOME}/bin
+
+source ~/.bash_profile
+</pre>

SETUP-WINDOWS.md

+# Windows
+
+Java下载
+------
+<pre>
+https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
+
+Windows x64 | jdk-8u261-windows-x64.exe
+</pre>
+
+Java安装
+------
+<pre>
+双击，下一步...
+</pre>
+
+Java环境变量
+------
+<pre>
+1、“我的电脑” 右键菜单点击 “属性(R)” 切换到 “控制面板 > 系统和安全 > 系统” 界面
+</pre>
+![avatar](Windows-控制面板.png)
+
+<pre>
+2、左侧菜单点击 “高级系统设置” 打开 “系统属性”
+</pre>
+![avatar](Windows-系统属性.png)
+
+<pre>
+3、点击 “环境变量(N)...” 打开 “环境变量”
+</pre>
+![avatar](Windows-环境变量.png)
+
+Java环境变量
+------
+<pre>
+1、新增，变量名(N)：JAVA_HOME，变量值(V)：jdk安装目录
+</pre>
+![avatar](Windows-环境变量-JAVA_HOME.png)
+
+<pre>
+2、新增，变量名(N)：JRE_HOME，变量值(V)：jre安装目录
+</pre>
+![avatar](Windows-环境变量-JRE_HOME.png)
+
+<pre>
+3、新增，变量名(N)：CLASSPATH，变量值(V)：jdk安装目录\lib\dt.jar:jdk安装目录\lib\tools.jar:jre安装目录\lib
+
+如：C:\Program Files\Java\jdk1.8.0_261\lib\dt.jar:C:\Program Files\Java\jdk1.8.0_261\lib\tools.jar:C:\Program Files\Java\jdk1.8.0_261\jre\lib
+注1：jdk安装目录 可用 %JAVA_HOME% 替换
+注2：jre安装目录 可用 %JRE_HOME% 替换
+</pre>
+
+<pre>
+4、编辑，变量名(N)：Path
+
+新增，变量值(V)：jdk安装目录\bin
+如：C:\Program Files\Java\jdk1.8.0_261\bin
+
+新增，变量值(V)：jre安装目录\bin
+如：C:\Program Files\Java\jdk1.8.0_261\jre\bin
+
+注1：jdk安装目录 可用 %JAVA_HOME% 替换
+注2：jre安装目录 可用 %JRE_HOME% 替换
+</pre>
+
+安装成功？
+------
+<pre>
+Dos命令：
+
+java -version
+</pre>
+
+Maven
+------
+<pre>
+http://maven.apache.org/download.cgi
+
+下载 Binary tar.gz archive | apache-maven-3.6.3-bin.tar.gz
+
+解压
+</pre>
+
+Maven环境变量
+------
+<pre>
+1、新增，变量名(N)：MAVEN_HOME，变量值(V)：maven解压目录
+</pre>
+![avatar](Windows-环境变量-MAVEN_HOME.png)
+
+<pre>
+2、编辑，变量名(N)：Path
+
+新增，变量值(V)：maven解压目录\bin
+如：C:\Program Files\Apache\Maven\bin
+
+注1：maven解压目录 可用 %MAVEN_HOME% 替换
+</pre>

src/cn/qmai/study/java/demo1/AbstractCalc.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * 抽象类
+ *
+ * @author 宋欢
+ */
+public abstract class AbstractCalc {
+    /**
+     * 加
+     *
+     * @param num1 数1
+     * @param num2 数2
+     * @return 和
+     */
+    public abstract int add(int num1, int num2);
+
+    /**
+     * 减
+     *
+     * @param num1 减数
+     * @param num2 被减数
+     * @return 差
+     */
+    public abstract int subtract(int num1, int num2);
+
+}

src/cn/qmai/study/java/demo1/CalcImpl.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * @author 宋欢
+ */
+public class CalcImpl implements ICalc {
+    @Override
+    public int add(int num1, int num2) {
+        return num1 + num2;
+    }
+
+    @Override
+    public int subtract(int num1, int num2) {
+        return num1 - num2;
+    }
+
+}

src/cn/qmai/study/java/demo1/CalcImpl2.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * @author 宋欢
+ */
+public class CalcImpl2 extends AbstractCalc {
+
+    @Override
+    public int add(int num1, int num2) {
+        return num1 + num2;
+    }
+
+    @Override
+    public int subtract(int num1, int num2) {
+        return num1 - num2;
+    }
+
+}

src/cn/qmai/study/java/demo1/ComplexArr.java

+package cn.qmai.study.java.demo1;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 复杂数组
+ *
+ * @author 宋欢
+ */
+public class ComplexArr {
+    /**
+     * Map初始容量
+     */
+    private static final int MAP_INITIAL_CAPACITY = 4;
+
+    public static void main(String[] args) {
+        Map<Object, Object> book1 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book1.put(null, 1);
+        book1.put("name", "PHP核心技术与最佳实践");
+
+        Map<Object, Object> book2 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book2.put(null, "深入PHP：面向对象、模式与实践");
+        book2.put("price", 100);
+
+        Map<Object, Object> book3 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book3.put(null, 3);
+        book3.put("name", "PHP7内核剖析");
+        book3.put(null, 55.5);
+
+        List<Object> book4 = new ArrayList<>();
+        book4.add("PHP安全之道");
+        book4.add(62);
+
+        List<Object> book_3_4 = new ArrayList<>();
+        book_3_4.add(book3);
+        book_3_4.add(book4);
+
+        Map<Object, Object> books = new HashMap<>(MAP_INITIAL_CAPACITY);
+        books.put(1, book1);
+        books.put("深入PHP", book2);
+        books.put(null, book_3_4);
+
+        System.out.println(books);
+    }
+
+}

src/cn/qmai/study/java/demo1/DownloadMp3.java

+package cn.qmai.study.java.demo1;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 同时下载8首歌
+ *
+ * @author 宋欢
+ */
+public class DownloadMp3 {
+    /**
+     * 默认的连接超时，单位：毫秒
+     */
+    public static final int DEFAULT_CONNECT_TIMEOUT_MS = 30 * 1000;
+
+    /**
+     * 默认的分配缓存空间，单位：字节
+     */
+    public static final int DEFAULT_BUCKET = 4096;
+
+    /**
+     * Map初始容量
+     */
+    private static final int MAP_INITIAL_CAPACITY = 8;
+
+    /**
+     * 发送下载请求
+     *
+     * @param url   访问链接，a URL String
+     * @param local 保存到本地的文件名，包括目录路径
+     * @throws IOException 下载失败，错误消息
+     */
+    public static void download(String url, String local) throws IOException {
+        HttpURLConnection urlConn = null;
+        BufferedInputStream in = null;
+        BufferedOutputStream out = null;
+
+        try {
+            urlConn = (HttpURLConnection) (new URL(url)).openConnection();
+            urlConn.setRequestProperty("Connection", "Keep-Alive");
+            urlConn.setRequestMethod("GET");
+            urlConn.setConnectTimeout(DEFAULT_CONNECT_TIMEOUT_MS);
+            urlConn.connect();
+
+            int statusCode = urlConn.getResponseCode();
+            if (statusCode == HttpURLConnection.HTTP_OK) {
+                in = new BufferedInputStream(urlConn.getInputStream());
+                out = new BufferedOutputStream(new FileOutputStream(new File(local)));
+
+                int size;
+                byte[] bucket = new byte[DEFAULT_BUCKET];
+                while ((size = in.read(bucket)) != -1) {
+                    if (size > 0) {
+                        out.write(bucket, 0, size);
+                        out.flush();
+                    }
+                }
+            } else {
+                String errMsg = urlConn.getResponseMessage();
+                throw new IOException(errMsg);
+            }
+        } finally {
+            if (out != null) {
+                out.close();
+            }
+
+            if (in != null) {
+                in.close();
+            }
+
+            if (urlConn != null) {
+                urlConn.disconnect();
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        // 下载网站 => 本地目录
+        Map<String, String> paths = new HashMap<>(MAP_INITIAL_CAPACITY);
+
+        paths.put("http://***.com/download?name=晴天.mp3", "mp3/晴天.mp3");
+        paths.put("http://***.com/download?name=稻香.mp3", "mp3/稻香.mp3");
+        paths.put("http://***.com/download?name=夜曲.mp3", "mp3/夜曲.mp3");
+        paths.put("http://***.com/download?name=安静.mp3", "mp3/安静.mp3");
+        paths.put("http://***.com/download?name=青花瓷.mp3", "mp3/青花瓷.mp3");
+        paths.put("http://***.com/download?name=东风破.mp3", "mp3/东风破.mp3");
+        paths.put("http://***.com/download?name=等你下课.mp3", "mp3/等你下课.mp3");
+        paths.put("http://***.com/download?name=爱在西元前.mp3", "mp3/爱在西元前.mp3");
+
+        for (Map.Entry<String, String> entry : paths.entrySet()) {
+            String url = entry.getKey();
+            String local = entry.getValue();
+
+            new Thread(() -> {
+                try {
+                    download(url, local);
+                } catch (IOException e) {
+                    System.out.println(e.getMessage());
+                }
+            }).start();
+        }
+    }
+
+}

src/cn/qmai/study/java/demo1/HelloWorld.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * 实战
+ *
+ * @author 宋欢
+ */
+public class HelloWorld {
+
+    public static void main(String[] args) {
+        System.out.println("Hello World");
+    }
+
+}

src/cn/qmai/study/java/demo1/ICalc.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * 接口
+ *
+ * @author 宋欢
+ */
+public interface ICalc {
+    /**
+     * 加
+     *
+     * @param num1 数1
+     * @param num2 数2
+     * @return 和
+     */
+    int add(int num1, int num2);
+
+    /**
+     * 减
+     *
+     * @param num1 减数
+     * @param num2 被减数
+     * @return 差
+     */
+    int subtract(int num1, int num2);
+
+}

src/cn/qmai/study/java/demo1/SimpleArr.java

+package cn.qmai.study.java.demo1;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 简单数组
+ *
+ * @author 宋欢
+ */
+public class SimpleArr {
+    /**
+     * Map初始容量
+     */
+    private static final int MAP_INITIAL_CAPACITY = 4;
+
+    public static void main(String[] args) {
+        Map<String, Object> book1 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book1.put("id", 1);
+        book1.put("name", "Java核心技术");
+
+        Map<String, Object> book2 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book2.put("name", "Java编程思想");
+        book2.put("price", 108);
+
+        Map<String, Object> book3 = new HashMap<>(MAP_INITIAL_CAPACITY);
+        book3.put("id", 3);
+        book3.put("name", "Java并发编程实战");
+        book3.put("price", 47.5);
+
+        List<Map<String, Object>> books = new ArrayList<>();
+        books.add(book1);
+        books.add(book2);
+        books.add(book3);
+
+        System.out.println(books);
+    }
+
+}

src/cn/qmai/study/java/demo1/Variables.java

+package cn.qmai.study.java.demo1;
+
+/**
+ * 定义变量
+ *
+ * @author 宋欢
+ */
+public class Variables {
+
+    public static void main(String[] args) {
+        // 布尔
+        boolean var1 = true;
+
+        // 整数
+        int var2 = 1;
+
+        // 浮点数
+        float var3 = 1.2f;
+
+        // 字符串
+        String var4 = "abc";
+
+        // 数组
+        int[] var5 = {1, 2, 3};
+        String[] var6 = {"a", "b", "c"};
+    }
+
+}