add mall-tiny-lombok

mall-tiny-lombok/.gitignore

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+HELP.md
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+/build/
+
+### VS Code ###
+.vscode/

mall-tiny-lombok/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.macro.mall</groupId>
+    <artifactId>mall-tiny-lombok</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>mall-tiny-lombok</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+        <skipTests>true</skipTests>
+    </properties>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.3.0.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <dependencies>
+        <!--SpringBoot通用依赖模块-->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-aop</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <!--lombok依赖-->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/MallTinyApplication.java

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+package com.macro.mall.tiny;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MallTinyApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MallTinyApplication.class, args);
+    }
+
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/BuilderExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.Builder;
+import lombok.ToString;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@Builder
+@ToString
+public class BuilderExample {
+    private Long id;
+    private String name;
+    private Integer age;
+
+    public static void main(String[] args) {
+        BuilderExample example = BuilderExample.builder()
+                .id(1L)
+                .name("test")
+                .age(20)
+                .build();
+        System.out.println(example);
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/CleanupExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.Cleanup;
+
+import java.io.*;
+
+/**
+ * Created by macro on 2020/12/16.
+ */
+public class CleanupExample {
+    public static void main(String[] args) throws IOException {
+        String inStr = "Hello World!";
+        //使用输入输出流自动关闭，无需编写try catch和调用close()方法
+        @Cleanup ByteArrayInputStream in = new ByteArrayInputStream(inStr.getBytes("UTF-8"));
+        @Cleanup ByteArrayOutputStream out = new ByteArrayOutputStream();
+        byte[] b = new byte[1024];
+        while (true) {
+            int r = in.read(b);
+            if (r == -1) break;
+            out.write(b, 0, r);
+        }
+        String outStr = out.toString("UTF-8");
+        System.out.println(outStr);
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/ConstructorExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.*;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@NoArgsConstructor
+@RequiredArgsConstructor(staticName = "of")
+@AllArgsConstructor
+public class ConstructorExample {
+    @NonNull
+    private Long id;
+    private String name;
+    private Integer age;
+
+    public static void main(String[] args) {
+        //无参构造器
+        ConstructorExample example1 = new ConstructorExample();
+        //全部参数构造器
+        ConstructorExample example2 = new ConstructorExample(1L,"test",20);
+        //@NonNull注解的必须参数构造器
+        ConstructorExample example3 = ConstructorExample.of(1L);
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/DataExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.NonNull;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@Data
+public class DataExample {
+    @NonNull
+    private Long id;
+    @EqualsAndHashCode.Exclude
+    private String name;
+    @EqualsAndHashCode.Exclude
+    private Integer age;
+
+    public static void main(String[] args) {
+        //@RequiredArgsConstructor已生效
+        DataExample example1 = new DataExample(1L);
+        //@Getter @Setter已生效
+        example1.setName("test");
+        example1.setAge(20);
+        //@ToString已生效
+        System.out.println(example1);
+        DataExample example2 = new DataExample(1L);
+        //@EqualsAndHashCode已生效
+        System.out.println(example1.equals(example2));
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/EqualsAndHashCodeExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@Getter
+@Setter
+@EqualsAndHashCode
+public class EqualsAndHashCodeExample {
+    private Long id;
+    @EqualsAndHashCode.Exclude
+    private String name;
+    @EqualsAndHashCode.Exclude
+    private Integer age;
+
+    public static void main(String[] args) {
+        EqualsAndHashCodeExample example1 = new EqualsAndHashCodeExample();
+        example1.setId(1L);
+        example1.setName("test");
+        example1.setAge(20);
+        EqualsAndHashCodeExample example2 = new EqualsAndHashCodeExample();
+        example2.setId(1L);
+        //equals方法只对比id，返回true
+        System.out.println(example1.equals(example2));
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/GetterLazyExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.Getter;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+public class GetterLazyExample {
+    @Getter(lazy = true)
+    private final double[] cached = expensive();
+
+    private double[] expensive() {
+        double[] result = new double[1000000];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = Math.asin(i);
+        }
+        return result;
+    }
+
+    public static void main(String[] args) {
+        //使用Double Check Lock 样板代码对属性进行懒加载
+        GetterLazyExample example = new GetterLazyExample();
+        System.out.println(example.getCached().length);
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/GetterSetterExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.Setter;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+public class GetterSetterExample {
+    @Getter
+    @Setter
+    private String name;
+    @Getter
+    @Setter(AccessLevel.PROTECTED)
+    private Integer age;
+
+    public static void main(String[] args) {
+        GetterSetterExample example = new GetterSetterExample();
+        example.setName("test");
+        example.setAge(20);
+        System.out.printf("name:%s age:%d",example.getName(),example.getAge());
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/LogExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.extern.java.Log;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@Log
+public class LogExample {
+    public static void main(String[] args) {
+        log.info("level info");
+        log.warning("level warning");
+        log.severe("level severe");
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/LogSlf4jExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+@Slf4j
+public class LogSlf4jExample {
+    public static void main(String[] args) {
+        log.info("level:{}","info");
+        log.warn("level:{}","warn");
+        log.error("level:{}", "error");
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/NonNullExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.NonNull;
+
+/**
+ * Created by macro on 2020/12/16.
+ */
+public class NonNullExample {
+    private String name;
+    public  NonNullExample(@NonNull String name){
+        this.name = name;
+    }
+
+    public static void main(String[] args) {
+        new NonNullExample("test");
+        //会抛出NullPointerException
+        new NonNullExample(null);
+    }
+}

mall-tiny-lombok/src/main/java/com/macro/mall/tiny/example/SneakyThrowsExample.java

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+package com.macro.mall.tiny.example;
+
+import lombok.SneakyThrows;
+
+import java.io.UnsupportedEncodingException;
+
+/**
+ * Created by macro on 2020/12/17.
+ */
+public class SneakyThrowsExample {
+
+    //自动抛出异常，无需处理
+    @SneakyThrows(UnsupportedEncodingException.class)
+    public static byte[] str2byte(String str){
+        return str.getBytes("UTF-8");
+    }
+
+    public static void main(String[] args) {
+        String str = "Hello World!";
+        System.out.println(str2byte(str).length);
+    }
+}