这是来自WebSphere日志文件的示例-
[1/31/19 13:55:55:567 CET] 0000099c ThreadPoolTas I org.springframework.scheduling.concurrent.ExecutorConfigurationSupport shutdown Shutting down ExecutorService 'sr_taskExecutor'
[1/31/19 13:55:55:568 CET] 0000099c appDispatcher E org.springframework.web.servlet.FrameworkServlet initServletBean Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'messageSource' defined in class path resource [context/main/portal-main-context.xml]: Unsatisfied dependency expressed through constructor argument with index 0 of type [no.myapp.portal.core.internal.PortalUserRequestData]: : Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
Related cause: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
Related cause: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource_db811': Invocation of init method failed; nested exception is javax.naming.NameNotFoundException: Context: Cell-01, name: ds_appng_811: First component in name ds_appng_811 not found. [Root exception is org.omg.CosNaming.NamingContextPackage.NotFound: IDL:omg.org/CosNaming/NamingContext/NotFound:1.0]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:752)
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:193)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:985)
at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:524)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1892)
Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [no.myapp.api.common.ProxiedClientServiceFactory] for bean with name 'myappapiFactory' defined in ServletContext resource [/WEB-INF/app-context.xml]; nested exception is java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1281)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:745)
... 47 more
Caused by: java.lang.ClassNotFoundException: no.myapp.api.common.ProxiedClientServiceFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at com.ibm.ws.bootstrap.ExtClassLoader.findClass(ExtClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
********Skip Trace************
[1/31/19 13:55:57:004 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain HttpQueueInboundDefaultSecure.
[1/31/19 13:55:57:006 CET] 00000001 TCPChannel I TCPC0001I: TCP Channel TCP_3 is listening on host * (IPv6) port 9048.
[1/31/19 13:55:57:008 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain WCInboundAdminSecure.
[1/31/19 13:55:57:010 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain WCInboundDefaultSecure.
[1/31/19 13:55:57:011 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain1.
[1/31/19 13:55:57:012 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain2.
[1/31/19 13:55:57:012 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain3.
[1/31/19 13:55:57:013 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain4.
[1/31/19 13:55:57:014 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain5.
[1/31/19 13:55:57:014 CET] 00000001 WSChannelFram A CHFW0019I: The Transport Channel Service has started chain SOAPAcceptorChain6.
在这里，我想获取org.omg.CosNaming.NamingContextPackage.NotFound事件的时间戳，该时间戳位于（1/31/19 13:55:55:568 CET）上方几行。
如果目标字符串出现在单行中，那么到目前为止，下面的代码仍有效-
code="org.omg.CosNaming.NamingContextPackage.NotFound"
with open('Server01/SystemOut.log',"r") as data:
for i in data:
if code in i.strip():
val = i[i.find("[")+1:i.find("]")].strip()
print i ##Result stack but single line
print val ##Result only timestamp
预期结果： 针对特定异常字符串的时间戳列表
org.omg.CosNaming.NamingContextPackage.NotFound - ['1/31/19 13:55:55:568 CET']
答案 0 :(得分：1)
如果可能的话，我建议使用正则表达式跟踪时间戳：
import re
# before the loop
timestamp_pattern = re.compile("\[([\d/\s:]+\s+CET)\]")
timestamp_str =""
code="org.omg.CosNaming.NamingContextPackage.NotFound"
with open() ... as lines:
for line in lines:
# line could be like this for example
line = "[1/31/19 13:55:55:568 CET] blablabla"
tmatch = timestamp_pattern.search(line)
# if no match timestamp_str would not be changed
if tmatch:
timestamp_str = tmatch.group(0)
if code in line:
print(time_stamp_str)
答案 1 :(得分：1)
以下是带有注释的日志过滤错误示例：
def contains_timestamp(s):
return s.startswith('[') and 'CET' in s
exception = 'org.omg.CosNaming.NamingContextPackage.NotFound'
errors = []
with open('log.txt', "r") as fl:
data = fl.readlines()
i = 0 # line number
while i < len(data):
s = data[i]
i += 1
if not contains_timestamp(s): # we are looking for timestamp
continue
timestamp = s[s.find("[") + 1:s.find("]")].strip()
while i < len(data) and not contains_timestamp(data[i]) and exception not in data[i]: # we are looking for line with exception
i += 1
if i == len(data): # EOF reached
break
s = data[i]
if contains_timestamp(s): # timestamp means that we found new log entry
continue
errors.append(timestamp)
i += 1
print errors
答案 2 :(得分：1)
使用正则表达式检查行是否以时间戳开头，并在找到新时间戳时更新时间戳。
如果在以下行中找到代码，则继续遍历文件并汇总当前时间戳：
import re
pat = re.compile('^\[\d{1,2}/\d{1,2}/\d{2} \d{1,2}:\d{1,2}:\d{1,2}:\d{3} \w{3}\]')
tstamp = None # initally current tstamp is None
tstamps = [] # initially current tstamps is empty list
code = 'org.omg.CosNaming.NamingContextPackage.NotFound'
with open('Server01/SystemOut.log') as lines:
for line in lines:
if re.match(pat, line):
tstamp = re.findall(pat, line)[0]
if code in line:
# append the tstamp excluding terminal square brackets
tstamps.append(tstamp[1:-1])
print('{c} - {t}'.format(c=code, t=tstamps))
随样本数据一起打印
org.omg.CosNaming.NamingContextPackage.NotFound - ['1/31/19 13:55:55:568 CET']
答案 3 :(得分：1)
您可以结合使用re模块中的正则表达式和generator函数。生成器函数将紧随其后的所有行（其中带有时间戳）分组在一起。
import re
code = "org.omg.CosNaming.NamingContextPackage.NotFound"
timestamp_pattern = re.compile("\[([\d/\s:]+\s+CET)\]")
#log_filename = 'Server01/SystemOut.log'
log_filename = 'Server01_SystemOut.log'
def read_blocks(log_filename):
""" Group lines following one with a timestamp together with it. """
with open(log_filename, "r") as data:
block = []
for line in data:
if not timestamp_pattern.search(line): # Continue current block?
block.append(line)
else:
if block: # Previous block?
yield(''.join(block))
block = [line] # Start new block.
for block in read_blocks(log_filename):
if code in block:
timestamp = timestamp_pattern.search(block).group()
print('timestamp: {}'.format(timestamp))
print(block)