数组转换成以逗号分隔开的字符串

String[] strArray = {"aaa","bbb","ccc"}；
String  str= StringUtils.join(strArry,",");
System.out.println(str);

以逗号分隔开的字符串转换成数组

String str = "aaa,bbb,ccc";
String[] strArray = str.split(",");
for(String s : strArray){
   System.out.println(s);       
}