從Java String中提取文本

Question

我正在使用第三方庫，它以String（不是Exception對象）的形式返回Exception信息。 我想提取String堆棧跟蹤的某些部分以在GUI中顯示用戶。

兩個例子：

com.sdf.configure.model.change.InvalidChangeException: transformed change validation failed
    at com.sdf.configure.model.change.SimpleConfigChanger.performChange(SimpleConfigChanger.java:129)
    at com.sdf.portal.service.QosPolicyServiceImpl.applyPolicySnapshot(QosPolicyServiceImpl.java:99)
    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 com.referentia.commons.distributed.remoting.jms.JmsServiceExporter$1$1.run(JmsServiceExporter.java:189)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: com.sdf.configure.model.change.InvalidChangeException: can't add input service policy: policy has queueing
    at com.sdf.configure.model.validate.RuleBasedValidator$RuleBasedChangeValidator.checkValidChange(RuleBasedValidator.java:5188)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:304)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:140)
    at com.sdf.configure.model.validate.RuleBasedValidator.checkValidChange(RuleBasedValidator.java:1039)
    at com.sdf.configure.model.change.SimpleConfigChanger.performChange(SimpleConfigChanger.java:126)
    ... 12 more

我想提取文本： 無法添加輸入服務策略：策略已排隊

com.sdf.configure.model.change.InvalidChangeException: transformed change validation failed
    at com.sdf.configure.model.change.SimpleConfigChanger.performChange(SimpleConfigChanger.java:129)
    at com.sdf.portal.service.QosPolicyServiceImpl.applyPolicySnapshot(QosPolicyServiceImpl.java:99)
    at sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.sdf.commons.distributed.remoting.jms.JmsServiceExporter$1$1.run(JmsServiceExporter.java:189)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:619)
Caused by: com.sdf.configure.model.change.InvalidChangeException: compound change component validation failed
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:1309)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:361)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:140)
    at com.sdf.configure.model.validate.RuleBasedValidator.checkValidChange(RuleBasedValidator.java:1039)
    at com.sdf.configure.model.change.SimpleConfigChanger.performChange(SimpleConfigChanger.java:126)
    ... 11 more
Caused by: com.sdf.configure.model.change.InvalidChangeException: can't add input service policy: policy has shaping
    at com.sdf.configure.model.validate.RuleBasedValidator$RuleBasedChangeValidator.checkValidChange(RuleBasedValidator.java:5180)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:304)
    at com.sdf.configure.model.validate.AbstractContextChangeValidator.checkValidChange(AbstractContextChangeValidator.java:1306)
    ... 15 more

我想提取文字：

復合更改組件驗證失敗

無法添加輸入服務策略：策略已經整形

有任何優雅的方式嗎？ 找到我想要提取的部分的唯一方法似乎是我要提取的部分總是在前面：

引起：com.sdf.configure.model.change.InvalidChangeException：

Answer 1

這個正則表達式將處理...

原始正則表達式： ^Caused\\sby:\\s\\S+:(.+)$

作為Java字符串： "^Caused\\\\sby:\\\\s\\\\S+:(.+)$"

您可以使用此在線工具輕松驗證這一點 。

您需要包含MULTILINE選項

示例代碼snippit：

String regex = "^Caused\\sby:\\s\\S+:(.+)$";
Pattern p = Pattern.compile(regex, Pattern.MULTILINE);

Matcher m = p.matcher(exceptionString);
while (m.find()) {
    String outputThis = m.group(1);
}

Answer 2

使用string.indexOf獲取無效更改異常的位置，然后使用“at com”的stirng.index。 為了獲得堆棧跟蹤的下一部分的索引，tehn抓住兩個索引之間的所有內容，將異常文本字符串長度調整為偏移量

Answer 3

采用：

StringUtils.substringsBetween(searchMe, start, end);

像這樣：

String[] causes = StringUtils.substringsBetween(exceptionMessage, 
                        "Caused by: com.sdf.configure.model.change.InvalidChangeException:", 
                        "at com.sdf");

這將為您提供由第2和第3個參數分隔的文本數組。

這是JavaDoc