Java-如何仅读取输入流的某些部分
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我有一个需要解析输入文件并仅读取文件某些部分的要求。我有一个日志文件，其中包含不同级别的信息警告和错误。现在，我只需要阅读包含完整错误堆栈跟踪的部分。我如何使用Java实现此目的。
例如：
INFO | 2011-04-13 17:59:22,810 | Calling Feedback from 127.0.0.1
INFO | 2011-04-13 17:59:24,920 | Successfully called Feedback from 127.0.0.1
INFO | 2011-04-13 17:59:31,561 | FeedBackList
ERROR | 2011-04-13 19:00:41,640 |
java.util.concurrent.TimeoutException
at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:228)
at java.util.concurrent.FutureTask.get(FutureTask.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.orm.hibernate3.HibernateInterceptor.invoke(HibernateInterceptor.java:111)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy309.getConsumerProfileData(Unknown Source)
at com.scea.usps.model.service.impl.AccountSettingsServiceImpl.getUserProfile(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.orm.hibernate3.HibernateInterceptor.invoke(HibernateInterceptor.java:111)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy284.getUserProfile(Unknown Source)
at com.scea.usps.model.common.PsninfoUtility.getTop3Generes(Unknown Source)
at com.scea.usps.model.common.PsninfoUtility.updatePsnInfoDetail(Unknown Source)
at com.scea.platform.framework.api.PsnInfoThread.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
INFO | 2011-04-13 17:59:22,810 | Calling Feedback from 127.0.0.1
INFO | 2011-04-13 17:59:24,920 | Successfully called Feedback from 127.0.0.1
INFO | 2011-04-13 17:59:31,561 | FeedBackList
没有找到相关结果
已邀请:
5 个回复
翰冒绢县
BufferedReader in = new BufferedReader(new FileReader(\"logfile.log\")); String line = in.readLine(); StringBuffer buf = null; while (line != null) { if(line.startsWith(\"ERROR\")){ buf = new StringBuffer(); buf.append(line).append(\"\\n\"); while(line != null && !line.trim().equals(\"\")){ line = in.readLine(); buf.append(line).append(\"\\n\"); } //Now buf has your error an do whatever you want to do with it //then delete buf = null; } line = in.readLine(); }砷竣阿
樊熄忙暖
诫商
驮帽俺篮号
try { BufferedReader in = new BufferedReader(new FileReader(\"logfile.log\")); String line = in.readLine(); while (!line.startsWith(\"ERROR\")) { line = in.readLine(); if(line==null){ //throw exception here, ERROR not found in entire log file } } //HERE line will be your error line while (line!=null) { line = in.readLine(); //do something with line } //here you have reached the end of the file } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }