如何用空行分割段落？
[英]How do I split the paragraph using empty lines?
问题描述
I am trying to split paragraph using 2 empty lines. 
我正在尝试使用2个空行拆分段落。 I tried using String.split() , StringTokenizer and StringUtils classes, but none worked. 我尝试使用String.split() ， StringTokenizer和StringUtils类，但没有一个起作用。
Here is my code: 这是我的代码：
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [1/0] via 172.16.0.1, internal
S 10.100.8.0/21 [10/0] is directly connected, vlink10
C 0.0.2.0/24 is directly connected, internal
C 0.0.2.0/24 is directly connected, wan1
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink21
[10/0] is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink30
C 0.0.2.0/32 is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink21
C 0.0.2.0/32 is directly connected, vlink21
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink11
[10/0] is directly connected, vlink31
C 0.0.1.0/24 is directly connected, vlink31
C 0.0.1.0.1.1/32 is directly connected, vlink31
I want split the above code like : 我想将上面的代码拆分为：
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [1/0] via 172.16.0.1, internal
S 10.100.8.0/21 [10/0] is directly connected, vlink10
C 0.0.2.0/24 is directly connected, internal
C 0.0.2.0/24 is directly connected, wan1
next one: 下一个：
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink21
[10/0] is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink30
C 0.0.2.0/32 is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink21
C 0.0.2.0/32 is directly connected, vlink21
next one : 下一个 ：
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink11
[10/0] is directly connected, vlink31
C 0.0.1.0/24 is directly connected, vlink31
C 0.0.1.0.1.1/32 is directly connected, vlink31
4 个解决方案
解决方案1
0 2016-04-23 19:49:58
A solution could be read the file line by line and store every line into a variable (or array, or what you need). 解决方案可以逐行读取文件，并将每一行存储到变量（或数组，或所需的变量）中。 While you are reading you can check if that line is an empty line in this way: 在阅读时，您可以通过以下方式检查该行是否为空行：
String newline = System.getProperty("line.separator"); // this is for getting proper new line;
boolean isNewline = myLine.startsWith(newline); //if your line start with newLine symbol
if isNewLine is true, then you can set a flag, and if next line is again empty, then you have just found your paragraph. 如果isNewLine为true，则可以设置一个标志，如果下一行再次为空，则您刚刚找到了段落。
解决方案2
0 2016-04-23 19:58:44
String#split() with a regular expression should work. 具有正则表达式的String#split()应该可以工作。
For example: 例如：
String[] paragraphs = input.split("\\\\n\\\\n\\\\n");
Note: this works with Unix newlines only. 注意：这仅适用于Unix换行符。
解决方案3
0 2016-04-23 22:27:51
This can be done with simple regex: 这可以通过简单的正则表达式来完成：
Try: 尝试：
String[] paragraphs = text.split("(?im)(\r?\n){3,}");
Where variable text contains your data. 其中可变text包含您的数据。 Based on sample input data, statement above will split it into 3 parts. 根据样本输入数据，以上陈述将其分为三部分。 This solution will work with files created on Windows or Linux so platform agnostic. 此解决方案将与在Windows或Linux上创建的文件一起使用，因此与平台无关。
解决方案4
0 2016-04-23 23:18:24
You could split your code by the two empty lines in between using regex: 您可以使用regex将代码分成两个空行：
public static void main(String[] args)
{
String str=" DeviceNames (interfacename) # show commands\n"+
" Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP\n"+
" O - OSPF, IA - OSPF inter area\n"+
" N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2\n"+
" E1 - OSPF external type 1, E2 - OSPF external type 2\n"+
" i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area\n"+
" * - candidate default\n"+
"\n"+
" S* 0.0.0.0/0 [1/0] via 172.16.0.1, internal\n"+
" S 10.100.8.0/21 [10/0] is directly connected, vlink10\n"+
" C 0.0.2.0/24 is directly connected, internal\n"+
" C 0.0.2.0/24 is directly connected, wan1\n"+
"\n"+
"\n"+
" DeviceNames (interfacename) # show commands\n"+
" Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP\n"+
" O - OSPF, IA - OSPF inter area\n"+
" N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2\n"+
" E1 - OSPF external type 1, E2 - OSPF external type 2\n"+
" i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area\n"+
" * - candidate default\n"+
"\n"+
" S* 0.0.0.0/0 [10/0] is directly connected, vlink21\n"+
" [10/0] is directly connected, vlink30\n"+
" C 0.0.2.0/24 is directly connected, vlink30\n"+
" C 0.0.2.0/32 is directly connected, vlink30\n"+
" C 0.0.2.0/24 is directly connected, vlink21\n"+
" C 0.0.2.0/32 is directly connected, vlink21\n"+
"\n"+
"\n"+
" DeviceNames (interfacename) # show commands\n"+
" Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP\n"+
" O - OSPF, IA - OSPF inter area\n"+
" N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2\n"+
" E1 - OSPF external type 1, E2 - OSPF external type 2\n"+
" i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area\n"+
" * - candidate default\n"+
"\n"+
" S* 0.0.0.0/0 [10/0] is directly connected, vlink11\n"+
" [10/0] is directly connected, vlink31\n"+
" C 0.0.1.0/24 is directly connected, vlink31\n"+
" C 0.0.1.0.1.1/32 is directly connected, vlink31\n"+
"";
String[] array = str.split("(?<=\\S)\\n\\n\\n");
for (int i = 0; i < array.length; i++) {
System.out.println(String.format("================ %1$d ================\n%2$s", i + 1, array[i]));
}
}
Output: 输出：
================ 1 ================
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [1/0] via 172.16.0.1, internal
S 10.100.8.0/21 [10/0] is directly connected, vlink10
C 0.0.2.0/24 is directly connected, internal
C 0.0.2.0/24 is directly connected, wan1
================ 2 ================
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink21
[10/0] is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink30
C 0.0.2.0/32 is directly connected, vlink30
C 0.0.2.0/24 is directly connected, vlink21
C 0.0.2.0/32 is directly connected, vlink21
================ 3 ================
DeviceNames (interfacename) # show commands
Codes: K - kernel, C - connected, S - static, R - RIP, B - BGP
O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default
S* 0.0.0.0/0 [10/0] is directly connected, vlink11
[10/0] is directly connected, vlink31
C 0.0.1.0/24 is directly connected, vlink31
C 0.0.1.0.1.1/32 is directly connected, vlink31
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