我想编写可以读取日志文件并将其拆分为多个事件的代码，使用时间戳作为拆分器（因为每个日志条目都以时间戳开头）。我想分割的日志样本如下。我也想保留时间戳。
所以如果这是我的输入：
01 Aug 2016 04:48:13,311 ERROR [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Exception while calling /purchases: x-company-status : UNKNOWN_ERROR response status: Internal Server Error
01 Aug 2016 04:48:13,311 WARN [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Failed to process order, will be re-tried: ADD2500051FR
01 Aug 2016 04:48:13,332 INFO [pool-2-thread-12436] com.delegate - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Getting Email from Primary email
01 Aug 2016 04:48:13,363 WARN [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Message processing failed QueueMessage [payload=ADD2500051FR, delaySeconds=0, sqsId=51f70e3f-554a-463b-8384-0b2c25a90450, stringAttributes={features=adac2911-0578-4bcd-b8c3-783481a48e1d, accept-language=FR_FR, request-id=836ac8b6-515d-4414-b4c6-ddd8a52ef497}]
com.orders.exception.orderserviceException: Error in Calling PUT purchase from main service
at com.OrderServiceDelegate.handleInternalServerErrors(OrderServiceDelegate.java:352)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody0(OrderServiceDelegate.java:113)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody1$advice(OrderServiceDelegate.java:37)
at com.OrderServiceDelegate.sendOrderForProcessing(OrderServiceDelegate.java:1)
at com.orders.queue.OrdersQueueWorker.doWork(OrdersQueueWorker.java:168)
at com.queue.SQSQueueWorker.lambda$0(SQSQueueWorker.java:149)
at com.queue.SQSQueueWorker.dt_access$492(SQSQueueWorker.java)
at com.queue.SQSQueueWorker$$dtt$$Lambda$8/852112146.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
01 Aug 2016 04:48:13,365 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Order will be re-tried after 300 seconds: ADD2500051FR
01 Aug 2016 04:48:15,600 INFO [myScheduler-3] com.queue.SQSQueueWorker - x-company-requestid=sqs-worker service_name=orders_v3 Processing messages message_number=1
01 Aug 2016 04:48:15,600 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Received msg from SQS:QueueMessage [payload=428CB476547214700268914651663, delaySeconds=0, sqsId=7f4dcbbe-90c4-4e56-b4ab-50332597b5d8, stringAttributes={features=FIS-JEM, accept-language=EN_US, request-id=a2c31da4-517f-40ec-8587-624f97393659}]
然后我的输出应该是（水平线描绘一个条目结束而另一个条目开始的位置）：
01 Aug 2016 04:48:13,311 ERROR [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Exception while calling /purchases: x-company-status : UNKNOWN_ERROR response status: Internal Server Error
//--------------------------------------------
01 Aug 2016 04:48:13,311 WARN [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Failed to process order, will be re-tried: ADD2500051FR
//--------------------------------------------
01 Aug 2016 04:48:13,332 INFO [pool-2-thread-12436] com.delegate - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Getting Email from Primary email
//--------------------------------------------
01 Aug 2016 04:48:13,363 WARN [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Message processing failed QueueMessage [payload=ADD2500051FR, delaySeconds=0, sqsId=51f70e3f-554a-463b-8384-0b2c25a90450, stringAttributes={features=adac2911-0578-4bcd-b8c3-783481a48e1d, accept-language=FR_FR, request-id=836ac8b6-515d-4414-b4c6-ddd8a52ef497}]
com.orders.exception.orderserviceException: Error in Calling PUT purchase from main service
at com.OrderServiceDelegate.handleInternalServerErrors(OrderServiceDelegate.java:352)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody0(OrderServiceDelegate.java:113)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody1$advice(OrderServiceDelegate.java:37)
at com.OrderServiceDelegate.sendOrderForProcessing(OrderServiceDelegate.java:1)
at com.orders.queue.OrdersQueueWorker.doWork(OrdersQueueWorker.java:168)
at com.queue.SQSQueueWorker.lambda$0(SQSQueueWorker.java:149)
at com.queue.SQSQueueWorker.dt_access$492(SQSQueueWorker.java)
at com.queue.SQSQueueWorker$$dtt$$Lambda$8/852112146.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
//--------------------------------------------
01 Aug 2016 04:48:13,365 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Order will be re-tried after 300 seconds: ADD2500051FR
//--------------------------------------------
01 Aug 2016 04:48:15,600 INFO [myScheduler-3] com.queue.SQSQueueWorker - x-company-requestid=sqs-worker service_name=orders_v3 Processing messages message_number=1
//--------------------------------------------
01 Aug 2016 04:48:15,600 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Received msg from SQS:QueueMessage [payload=428CB476547214700268914651663, delaySeconds=0, sqsId=7f4dcbbe-90c4-4e56-b4ab-50332597b5d8, stringAttributes={features=FIS-JEM, accept-language=EN_US, request-id=a2c31da4-517f-40ec-8587-624f97393659}]
我想我需要某种正则表达式，但我没有使用正则表达式通过Java代码进行这种拆分的经验。
我还发现了以下相关问题，但我并不了解那里建议的解决方案： java regex: capture multiline sequence between tokens
答案 0 :(得分：0)
以下代码使用您提供的日志并生成所需的输出。我在代码中包含了解释程序流程的注释。
<强>代码：
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Pattern;
public class Driver {
private static final String LINE_BREAK = System.lineSeparator();
// path to the logfile
private static final String LOG_FILE = "xin/xin.log";
// The regex below matches lines that begin with "00 Mth 0000 00:00:00,000".
private static Pattern pattern = Pattern.compile("^[0-9][0-9]\\s[A-Z][a-z][a-z]\\s[0-9][0-9][0-9][0-9]\\s[0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9][0-9][0-9]");
public static void main(String[] args) {
BufferedReader reader = null;
StringBuilder sb = new StringBuilder();
String line = "";
boolean firstRun = true;
try {
// instantiated the buffered reader
reader = new BufferedReader(new FileReader(new File(LOG_FILE)));
} catch(FileNotFoundException e) {
e.printStackTrace();
}
// loop until all lines are read from log file
while(true) {
try {
// get next line from log file
line = reader.readLine();
// if no more content in log file then break out of loop
if(line == null) {
break;
}
} catch (IOException e) {
e.printStackTrace();
}
// we don't want a line-break before the first line
if(firstRun) {
firstRun = false;
// append the first line to the string builder
sb.append(line);
} else {
// we've handled the first line, so now we
// append a line-break to the string builder
// before appending the next line
sb.append(LINE_BREAK);
// if the line matches the timestamp pattern then
// append another line-break
if(pattern.matcher(line).find()) {
sb.append(LINE_BREAK);
}
// add the line to the string builder
sb.append(line);
}
}
try {
// close the buffered reader
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
// print string builder contents to standard out
System.out.println(sb.toString());
}
}
<强>输出：
01 Aug 2016 04:48:13,311 ERROR [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Exception while calling /purchases: x-company-status : UNKNOWN_ERROR response status: Internal Server Error
01 Aug 2016 04:48:13,311 WARN [pool-2-thread-12436] com.orders.queue.OrdersQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Failed to process order, will be re-tried: ADD2500051FR
01 Aug 2016 04:48:13,332 INFO [pool-2-thread-12436] com.delegate - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Getting Email from Primary email
01 Aug 2016 04:48:13,363 WARN [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Message processing failed QueueMessage [payload=ADD2500051FR, delaySeconds=0, sqsId=51f70e3f-554a-463b-8384-0b2c25a90450, stringAttributes={features=adac2911-0578-4bcd-b8c3-783481a48e1d, accept-language=FR_FR, request-id=836ac8b6-515d-4414-b4c6-ddd8a52ef497}]
com.orders.exception.orderserviceException: Error in Calling PUT purchase from main service
at com.OrderServiceDelegate.handleInternalServerErrors(OrderServiceDelegate.java:352)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody0(OrderServiceDelegate.java:113)
at com.OrderServiceDelegate.sendOrderForProcessing_aroundBody1$advice(OrderServiceDelegate.java:37)
at com.OrderServiceDelegate.sendOrderForProcessing(OrderServiceDelegate.java:1)
at com.orders.queue.OrdersQueueWorker.doWork(OrdersQueueWorker.java:168)
at com.queue.SQSQueueWorker.lambda$0(SQSQueueWorker.java:149)
at com.queue.SQSQueueWorker.dt_access$492(SQSQueueWorker.java)
at com.queue.SQSQueueWorker$$dtt$$Lambda$8/852112146.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
01 Aug 2016 04:48:13,365 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Order will be re-tried after 300 seconds: ADD2500051FR
01 Aug 2016 04:48:15,600 INFO [myScheduler-3] com.queue.SQSQueueWorker - x-company-requestid=sqs-worker service_name=orders_v3 Processing messages message_number=1
01 Aug 2016 04:48:15,600 INFO [pool-2-thread-12436] com.queue.SQSQueueWorker - x-company-requestid=836ac8b6-515d-4414-b4c6-ddd8a52ef497-sqs service_name=orders_v3 Received msg from SQS:QueueMessage [payload=428CB476547214700268914651663, delaySeconds=0, sqsId=7f4dcbbe-90c4-4e56-b4ab-50332597b5d8, stringAttributes={features=FIS-JEM, accept-language=EN_US, request-id=a2c31da4-517f-40ec-8587-624f97393659}]
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