现象

String testString1 = "1, 1, 0, 0, 0, 6.17, 3.50,,,,,,,,,,,,,1";
String testString2 = "1, 1, 0, 0, 0, 6.17, 3.50,,,,,,,,,,,,,";

采用默认的split方式

testString.split(",");

这两者的结果是不一致的，前者的长度是20，后者为7. 因为字符串中产生了空值。如果头和尾都有值，中间空，长度不影响。否则split结果会去掉空值。

看下split的API

/**

	Splits this string around matches of the given regular expression.
	This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.
	The string "boo:and:foo", for example, yields the following results with these expressions:
	Split examples showing regex and result

	:{ "boo", "and", "foo" }
	o{ "b", "", ":and:f" }

	形参: regex – the delimiting regular expression
	返回值: the array of strings computed by splitting this string around matches of the given regular expression
	抛出: PatternSyntaxException – if the regular expression's syntax is invalid
*/
public String[] split(String regex) {
	return split(regex, 0, false);
}

解决方案

保留所有空值

String[] tpStrings = testString.split(",",-1);

不管空值出现在哪里，都不会丢弃

去掉所有空值

String[] tpStrings = testString.split(",+");

就是中间出现空值，也会舍弃