import java.io.*;
public class Wordcount {
public static void main(String[] args) throws Exception {
BufferedReader in = null;
String[] splited = null;
try {
in = new BufferedReader(new FileReader("sample.txt"));
String read = null;
while ((read = in.readLine()) != null) {
splited = read.split("systemSerialNumber:");
for (String part : splited) {
System.out.println(part);
}
}
} catch (IOException e) {
System.out.println("There was a problem: " + e);
e.printStackTrace();
} finally {
in.close();
}
System.out.println(splited[3]);
}
}
“sample.txt”文件包含以下文本。
"2018-10-16 19:54:26.691 [RawEventProcessor (2/2)] ERROR com.qolsys.iqcloud.processing.operators.RawEventProcessor1 - processRawPanelEvent():: SerialNumber systemSerialNumber: QV01D173700428AD is not mapped to any meid. {}",2
"2018-10-16 19:54:27.074 [RawEventProcessor (2/2)] ERROR com.qolsys.iqcloud.processing.operators.RawEventProcessor1 - processRawPanelEvent():: SerialNumber systemSerialNumber: QV01D173700428AD is not mapped to any meid. {}",2
"2018-10-16 19:54:27.293 [RawEventProcessor (2/2)] ERROR com.qolsys.iqcloud.processing.operators.RawEventProcessor1 - processRawPanelEvent():: SerialNumber systemSerialNumber: QV01D173700428AD is not mapped to any meid. {}",2
"2018-10-16 19:54:27.296 [RawEventProcessor (2/2)] ERROR com.qolsys.iqcloud.processing.operators.RawEventProcessor1 - processRawPanelEvent():: SerialNumber systemSerialNumber: QV01D173700428AD is not mapped to any meid. {}",2
我收到数组索引越界异常的错误。以及为什么我会收到此异常，即使在拆分后，我也不知道所有文本文件数据都存储在数组的一个索引处。剩下的都是空的。
堆栈跟踪 ：
线程“main”中的异常 java.lang.ArrayIndexOutOfBoundsException: 3 at Task1.Wordcount.main(Wordcount.java:29)
检查结果的长度是否为 2。最后一行可能为空。
Path path = Paths.get("sample.txt");
Files.lines(path, Charset.defaultCharset())
.forEach(line -> {
String[] splitted = read.split("systemSerialNumber:");
if (splitted.length == 2) {
...
}
});
作为不相关的信息：
String[] splitted = read.split("systemSerialNumber:", 2);
将结果限制为最多 2 个元素，以防"systemSerialNumber:"出现多次。
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