字符串拼接,字符串分割,字符串转集合,把Map转String,将字符串转报文

Joiner 可以快速地把多个字符串或字符串数组连接成为用特殊符号连接的字符串。

拼接

List<String> list = Lists.newArrayList("a","b","c");

String value =Joiner.on("-").skipNulls().join(list);

System.out.println(value); //输出为： a-b-c

分割

Splitter用来分割字符串

String testString = "Monday,Tuesday,,Thursday,Friday,,"; //英文分号分割；忽略空字符串 Splitter splitter = Splitter.on(",").omitEmptyStrings().trimResults(); System.out.println(splitter.split(testString).toString());

字符串转集合

List<String> list = Splitter.on("#").limit(3).splitToList("hello#world#heh#ss"); System.out.println(list.size());

把map变为stringe

 String join = Joiner.on(",").withKeyValueSeparator("=").join(stringStringMap);
 System.out.println(join);

转为报文
aaaabbbbccccdddd  相当于报文 result:[aaaa, bbbb, cccc, dddd]

List<String> result = Splitter.fixedLength(4).splitToList("aaaabbbbccccdddd");
        System.out.println(result);
        System.out.println(result.size());