guava的String之Splitter
2017-09-11 19:23
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1.常用方法
摘自官网的部分常用方法说明。
Base Factories
Method | Description | Example |
Splitter.on(char) | Split on occurrences of a specific, individual character. | Splitter.on(';') |
Splitter.on(CharMatcher) | Split on occurrences of any character in some category. | Splitter.on(CharMatcher.BREAKING_WHITESPACE) Splitter.on(CharMatcher.anyOf(";,.")) |
Splitter.on(String) | Split on a literal String. | Splitter.on(", ") |
Splitter.on(Pattern) Splitter.onPattern(String) | Split on a regular expression. | Splitter.onPattern("\r?\n") |
Splitter.fixedLength(int) | Splits strings into substrings of the specified fixed length. The last piece can be smaller than length, but will never be empty. | Splitter.fixedLength(3) |
Modifiers
Method | Description | Example |
omitEmptyStrings() | Automatically omits empty strings from the result. | Splitter.on(',').omitEmptyStrings(). split("a,,c,d") returns "a", "c", "d" |
trimResults() | Trims whitespace from the results; equivalent totrimResults(CharMatcher.WHITESPACE). | Splitter.on(',').trimResults().split ("a, b, c, d") returns "a", "b", "c", "d" |
trimResults(CharMatcher) | Trims characters matching the specified CharMatcher from results. | Splitter.on(',').trimResults (CharMatcher.is('_')).split("_a ,_b_ ,c__") returns "a ", "b_ ", "c". |
limit(int) | Stops splitting after the specified number of strings have been returned. | Splitter.on(',').limit(3).split ("a,b,c,d") returns "a", "b", "c,d" |
2.实例
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 | package string; import java.util.Map; import com.google.common.base.CharMatcher;import com.google.common.base.Splitter; public class SplitterUse { public static void useMethod() { //根据分隔符进行分割 String sequence="a,,-b, c,-d"; Iterable<String> iterator1=Splitter.on(",").split(sequence); System.out.println("根据分隔符进行分割:"); for(String str: iterator1) System.out.println(str); //去掉分割后空的字符串 Iterable<String> iterator2=Splitter.on(",").omitEmptyStrings().split(sequence); System.out.println("去掉分割后空的字符串:"); for(String str: iterator2) System.out.println(str); //去掉分后后字符串中的空格 Iterable<String> iterator3=Splitter.on(",").omitEmptyStrings().trimResults().split(sequence); System.out.println("去掉分后后字符串中的空格:"); for(String str: iterator3) System.out.println(str); Iterable<String> iterator5=Splitter.on(",").omitEmptyStrings().trimResults(CharMatcher.is('-')).split(sequence); System.out.println("去掉分后后字符串中'-':"); for(String str: iterator5) System.out.println(str); //以固定长度进行分割 //Iterable<String> iterator4=Splitter.fixedLength(2).split(sequence); Iterable<String> iterator4=Splitter.fixedLength(2).trimResults().split(sequence); System.out.println("以固定长度进行分割:"); for(String str: iterator4) System.out.println(str); //Splitter将处理结果处理成map类型 Map<String,String> map=Splitter.on(";").omitEmptyStrings().withKeyValueSeparator(",").split("a,c;quzer,yuanrq; , ;hello,csdn"); System.out.println("Splitter将处理结果处理成map类型:"); for(Map.Entry<String, String> entry: map.entrySet()) System.out.println("key="+ entry.getKey()+";value="+entry.getValue()); } public static void main(String[] args) { useMethod(); } } |
来自CODE的代码片
Splitter.java
运行结果:
根据分隔符进行分割:
a
-b
c
-d
去掉分割后空的字符串:
a
-b
c
-d
去掉分后后字符串中的空格:
a
-b
c
-d
去掉分后后字符串中'-':
a
b
c
d
以固定长度进行分割:
a,
,-
b,
c
,-
d
Splitter将处理结果处理成map类型:
key=a;value=c
key=quzer;value=yuanrq
key= ;value=
key=hello;value=csdn
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