init

.gitignore

+# Created by .ignore support plugin (hsz.mobi)
+#.gitignore
+.idea/workspace.xml
+
+*.iml
+.idea
+
+*/target/
+*/*.iml
+eureka/lib/
+payment-service/src/test/source/
+
+#begin!
+# Created by junliang.li
+RemoteSystemsTempFiles/
+target/
+.metadata/*
+.metadata/
+*.log
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+.nb-gradle/
+
+
+# Other Editor's noise
+*~
+*.swp
+
+# MacOSX noise
+.DS_Store
+# end!
+#.gitignore
+.idea/
+commons-amqp/commons-amqp.iml
+commons-base/commons-base.iml
+commons-dao/commons-dao.iml
+commons-redis/commons-redis.iml
+commons-service/commons-service.iml
+productService/productService.iml

demo1/pom.xml

+<?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">
+    <parent>
+        <artifactId>java-training</artifactId>
+        <groupId>cn.freemud</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>demo1</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>20.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>fastjson</artifactId>
+            <version>1.2.32</version>
+        </dependency>
+    </dependencies>
+
+
+</project>
\ No newline at end of file

demo1/src/main/java/cn/freemud/demo/po/User.java

+package cn.freemud.demo.po;
+
+import com.alibaba.fastjson.JSON;
+
+/**
+ * Created by chenwenshun on 2018/9/27.
+ */
+
+public class User {
+    private Long id;
+
+    private String username;
+
+    public User(Long id, String username) {
+        this.id = id;
+        this.username = username;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    @Override
+    public String toString() {
+        return JSON.toJSONString(this);
+    }
+}

demo1/src/test/java/cn/freemud/demo/GuavaTests.java

+package cn.freemud.demo;
+
+import cn.freemud.demo.po.User;
+import com.google.common.base.Function;
+import com.google.common.base.Joiner;
+import com.google.common.base.Splitter;
+import com.google.common.collect.*;
+import com.google.common.util.concurrent.RateLimiter;
+import org.junit.Test;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * Created by chenwenshun on 2018/9/27.
+ */
+
+public class GuavaTests {
+
+
+    @Test
+    public void testSplit(){
+
+        String mock = ",,a, b,c,,d,,";
+        List<String> list = Splitter.on(",").omitEmptyStrings().trimResults().splitToList(mock);
+        System.out.println(list.toString());
+        Joiner joiner = Joiner.on("/").skipNulls();
+        String result = joiner.join("a", 1, null, 'c');
+        System.out.println(result);
+        String[] names = new String[]{"bella", "tina", "ashun"};
+        System.out.println(joiner.join(names));
+        List<String> time = Splitter.on(":").splitToList("10:56");
+        System.out.println(time);
+    }
+
+    @Test
+    public void testRateLimite(){
+        RateLimiter limiter = RateLimiter.create(3);
+//        RateLimiter limiter = RateLimiter.create(10, 5, TimeUnit.SECONDS);
+        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
+        for (; ; ) {
+            limiter.acquire();
+            System.out.println(df.format(new Date()));
+        }
+    }
+
+
+    @Test
+    public void testMultimap(){
+        ListMultimap<Integer, String> listMutilMap = ArrayListMultimap.create();
+        listMutilMap.put(100, "1001");
+        listMutilMap.put(2, "21");
+        listMutilMap.put(2, "22");
+        listMutilMap.put(1, "1");
+        listMutilMap.put(1, "2");
+        listMutilMap.put(43, "431");
+        System.out.println(listMutilMap.keySet());//
+        System.out.println(listMutilMap.get(2));
+    }
+
+    /**
+     * 不可变集合
+     */
+    @Test
+    public void test4(){
+        List<String> list = Lists.newArrayList("a", "b", "c");
+        Collection<String> unmodifiableCollection = Collections.unmodifiableCollection(list);
+
+        ImmutableList<String> immutableList = ImmutableList.copyOf(list);
+
+        list.add("e");
+        System.out.println(unmodifiableCollection);
+        System.out.println(immutableList);
+        immutableList.add("a");
+
+    }
+
+    /**
+     * 集合 索引
+     */
+    @Test
+    public void test5(){
+        List<User> users = Lists.newArrayList();
+        users.add(new User(1L,"haha"));
+        users.add(new User(2L,"bella"));
+        users.add(new User(3L,"tina"));
+        users.add(new User(4L,"tom"));
+        users.add(new User(5L,"jerry"));
+        users.add(new User(6L,"tony"));
+        users.add(new User(7L,"tony"));
+
+        /**
+         * 对集合添加唯一索引
+         */
+        ImmutableMap<Long, User> uniqueIndex = FluentIterable
+                .from(users).uniqueIndex(new Function<User, Long>() {
+            @Override
+            public Long apply(User user) {
+                return user.getId();
+            }
+        });
+        User user = uniqueIndex.get(3L);
+        System.out.println(user);
+
+
+        /**
+         * 对集合添加非唯一索引
+         */
+        ImmutableListMultimap<String, User> index = FluentIterable
+                .from(users).index(new Function<User,String>() {
+            @Override
+            public String apply(User user) {
+                return user.getUsername();
+            }
+        });
+        List<User> userList = index.get("tony");
+        System.out.println(userList);
+
+    }
+
+
+    /**
+     * 集合运算主要有：并集、交集、差集。
+     */
+    @Test
+    public void test51() {
+        List<Integer> list1 = Lists.newArrayList(1, 2, 2, 1, 4, 5, 4, 3);
+        List<Integer> list2 = Lists.newArrayList(1, 2, 3, 7, 8, 9);
+        Sets.SetView<Integer> union = Sets.union(Sets.newHashSet(list1), Sets.newHashSet(list2));
+        Sets.SetView<Integer> difference = Sets.difference(Sets.newHashSet(list1), Sets.newHashSet(list2));
+        Sets.SetView<Integer> intersection = Sets.intersection(Sets.newHashSet(list1), Sets.newHashSet(list2));
+        System.out.println(union);
+        System.out.println(difference);
+        System.out.println(intersection);
+    }
+
+
+
+}

pom.xml

+<?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>cn.freemud</groupId>
+    <artifactId>java-training</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
+
+    <modules>
+        <module>demo1</module>
+    </modules>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                    <encoding>UTF-8</encoding>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+
+</project>
\ No newline at end of file