Java String.split()特殊字符的使用

split在jdk中用法说明：

String[]

split(String regex) Splits this string around matches of the given regular expression.

public String[] split(String regex)

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:

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

Parameters:

regex

 - the delimiting regular expression
Returns:the array of strings computed by splitting this string around matches of the given regular expression
Throws:

PatternSyntaxException

 -
if the regular expression's syntax is invalid
Since:1.4
See Also:

Pattern

String[]

split(String regex, int limit) Splits this string around matches of the given regular expression.

public String[] split(String regex,
int limit)

Splits this string around matches of the given regular expression.
The array returned by this method contains each substring of this string that is terminated by another substring that matches the given expression or is terminated by the end of the string. The substrings in the array are in the order in which they occur
in this string. If the expression does not match any part of the input then the resulting array has just one element, namely this string.

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1
times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have
any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.

The string "boo:and:foo", for example, yields the following results with these parameters:

Regex	Limit	Result
:	2	{ "boo", "and:foo" }
:	5	{ "boo", "and", "foo" }
:	-2	{ "boo", "and", "foo" }
o	5	{ "b", "", ":and:f", "", "" }
o	-2	{ "b", "", ":and:f", "", "" }
o	0	{ "b", "", ":and:f" }

An invocation of this method of the form str.split(regex, n) yields the same result as the expression

Pattern

.

compile

(regex).

split

(str, n)

Parameters:

regex

 - the delimiting regular expression

limit

 - the result threshold, as described above
Returns:the array of strings computed by splitting this string around matches of the given regular expression
Throws:

PatternSyntaxException

 -
if the regular expression's syntax is invalid
Since:1.4
See Also:

Pattern

split()返回是一个数组

注释：如果是符号的话，需要转义 ，例如：

用“|”作为分隔的话,必须是String.split("\\|"),这样才能正确的分隔开,不能用String.split("|");

还有String.split("\\.") String.split("\\*")等

最特殊的：以\分割String.split("\\\\")  这里面前两个是转义的，后面是两个的原因是因为字符串中是两个。

    （字符串中为什么是\\呢？因为java中字符串\会被转义的）