Question

我正在使用第三方库，它以String（不是Exception对象）的形式返回Exception信息。我想提取String堆栈跟踪的某些部分以在GUI中显示用户。

两个例子：

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

我想提取文字： 无法添加输入服务策略：策略已排队

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：

化合物更改组件验证失败

无法添加输入服务政策：政策已整形

任何优雅的方式来做到这一点？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总是先于：

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

Answer 1

这个正则表达式将处理......

原始正则表达式：^Caused\sby:\s\S+:(.+)$

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

您可以使用this online tool轻松验证这一点。

您需要包含MULTILINE选项

示例代码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获取无效更改异常的位置，然后使用“at com”的stirng.index。为了获得堆栈跟踪的下一部分的索引，tehn抓取两个索引之间的所有内容，将异常文本字符串长度调整为偏移量

Answer 3

使用：

StringUtils.substringsBetween(searchMe, start, end);

像这样：

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

这将为您提供由第2和第3个参数分隔的文本数组。

这是 JavaDoc

从Java String中提取文本

3 个答案: