Guava常用方法

本文内容采用groovy编写,列举部分常用方法,如需更多,请参照:guava常用方法

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def "获取字符在一个字符串中出现的次数"() {    given:    def a = "日子" //查询 '日' 和 '子' 在字符串中出现的次数    def b = "假如生活欺骗了你，\n" +            "不要悲伤，不要心急！\n" +            "忧郁的日子里须要镇静：\n" +            "相信吧，快乐的日子将会来临！\n" +            "心儿永远向往着未来；\n" +            "现在却常是忧郁。\n" +            "一切都是瞬息，一切都将会过去；\n" +            "而那过去了的，就会成为亲切的怀恋。"    println CharMatcher.anyOf(a).countIn(b);//4}

def "校验两个汉字是否相等(不分先后顺序)"() {    given:     def name = "cuiyongxu"    def name2 = "yongxucui"    when:    byte[] b1 = name.getBytes();    byte[] b2 = name2.getBytes();     byte[] b3 = name.getBytes(Charsets.US_ASCII);    byte[] b4 = name2.getBytes(Charsets.US_ASCII);     then:    false == Arrays.equals(b1, b2)//java 默认  false    true == Arrays.equals(b3, b4)//true}

def "拼接字符串"() {    given:    Joiner joiner = Joiner.on(":").skipNulls();    println joiner.join("123", null, "foo", "bar"," ","ddd","","aa",null,"bb");//123:foo:bar: :ddd::aa:bb}

def "map设置返回默认值,只对null有效,且前后值为同类型"() {     given:    def a = null    def b = Lists.newArrayList("aaa")    when:    def v = MoreObjects.firstNonNull(a, b)    then:    println v //[aaa]    v instanceof List}

def "判断字符串是否为空"() {    given:    def a = "";    def b = null;    def c = "null";    when:    def av = Strings.isNullOrEmpty(a)    def bv = Strings.isNullOrEmpty(b);    def cv = Strings.isNullOrEmpty(c);    then:    true == av    true == bv    false == cv}

def "判断两个值是否相等,可判断任意对象"() {    given:    def a = Lists.newArrayList("a")    def b = Lists.newArrayList("b")    def c = Lists.newArrayList("a")    println Objects.equal(a,b)    println Objects.equal(a,c)}

def "判断参数是否符合某种条件,不推荐使用,但是可模拟写法"() {    given:    def age = 55    boolean flag = age >= 18 && age < 99;    Preconditions.checkArgument(flag, "age must in range (18,99)");}

def "将String转换成list"() {    given:    String string = "2,a,c,5,e,6";    when:    List<String> list = Splitter.on(",").splitToList(string)    then:    println list}

def "将String转换成map"() {    given:    String string = "wansong=万*,liyiguang=李*光,wangzhuang=王*,lichaoshuai=李*帅";    when:    Map<String, String> map = Splitter.on(",").withKeyValueSeparator("=").split(string);    then:    println map.get("cuiyongxu")}

def "将String转换成list,去空格"() {    given:    String string = "2,a , c  ,5  ,e,  6";    when:    List<String> list = Splitter.on(",").omitEmptyStrings().trimResults().splitToList(string)    then:    println list}

def "Map转String"() {    given:    Map<String, String> map = Maps.newHashMap()    map.put("a", "b");    map.put("c", "d");    println Joiner.on(",").withKeyValueSeparator("=").join(map);}

def "将String按照特定规则切割,不去空值"() {    given:    String string = "aa.dd,,ff,,.";    List<String> list = Splitter.onPattern("[.|,]").splitToList(string);    println list}

def "正则分割,可包含多个标点符号,去空格,并转list"() {    given:    String string = "aa.dd,,ff,,.";    List<String> list = Splitter.onPattern("[.|,]").omitEmptyStrings().splitToList(string);    println list}

def "正则分割,可包含多个标点符号,去空格"() {    given:    Iterable<String> splitResults = Splitter.onPattern("[,，]{1,}")            .trimResults()            .omitEmptyStrings()            .split("hello,word,,世界，水平, ， , 我的，， 你的,大家的,");     splitResults.forEach({        String str ->            str;            println str    })}

def "获得两个字符串相同的前缀"() {    given:    def a = "com.google.common.base";    def b = "com.google.common.net";    println Strings.commonPrefix(a, b);}

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