關閉單引號，而在XML比較字符串的logback與JANINO

Question

使用的logback的條件處理來比較的logback一個XML配置文件兩個字符串如下失蹤......

<if condition="'test'.equals('test')"> 
    <then> 
     <include resource="logback.local.xml"/> 
    </then> 
</if> 

...導致以下異常。

14:22:08,315 |-ERROR in ch.qos.logback.core.joran.conditional.IfAction - Failed to parse condition ['test'.equals('test')] org.codehaus.commons.compiler.CompileException: Line 1, Column 38: Closing single quote missing 
    at org.codehaus.commons.compiler.CompileException: Line 1, Column 38: Closing single quote missing 
    at at org.codehaus.janino.Scanner.scan(Scanner.java:359) 
    at at org.codehaus.janino.Scanner.produce(Scanner.java:267) 
    at at org.codehaus.janino.TokenStreamImpl.produceToken(TokenStreamImpl.java:62) 
    at at org.codehaus.janino.TokenStreamImpl.peek(TokenStreamImpl.java:104) 
    at at org.codehaus.janino.TokenStreamImpl.peek(TokenStreamImpl.java:134) 
    at at org.codehaus.janino.Parser.peek(Parser.java:3145) 
    at at org.codehaus.janino.Parser.parseReturnStatement(Parser.java:2048) 
    at at org.codehaus.janino.Parser.parseStatement(Parser.java:1659) 
    at at org.codehaus.janino.Parser.parseBlockStatement(Parser.java:1512) 
    at at org.codehaus.janino.Parser.parseBlockStatements(Parser.java:1474) 
    at at org.codehaus.janino.Parser.parseMethodDeclarationRest(Parser.java:1313) 
    at at org.codehaus.janino.Parser.parseClassBodyDeclaration(Parser.java:894) 
    at at org.codehaus.janino.ClassBodyEvaluator.cook(ClassBodyEvaluator.java:231) 
    at at org.codehaus.janino.SimpleCompiler.cook(SimpleCompiler.java:200) 
    at at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:76) 
    at at org.codehaus.commons.compiler.Cookable.cook(Cookable.java:71) 
    at at ch.qos.logback.core.joran.conditional.PropertyEvalScriptBuilder.build(PropertyEvalScriptBuilder.java:47) 
    at at ch.qos.logback.core.joran.conditional.IfAction.begin(IfAction.java:65) 
    at at ch.qos.logback.core.joran.spi.Interpreter.callBeginAction(Interpreter.java:269) 
    at at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:145) 
    at at ch.qos.logback.core.joran.spi.Interpreter.startElement(Interpreter.java:128) 
    at at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:50) 
    at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:155) 
    at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:142) 
    at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:103) 
    at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53) 
    at at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75) 
    at at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150) 
    at at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84) 
    at at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55) 
    at at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150) 
    at at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124) 
    at at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412) 
    at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357) 
    at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383) 
    at at com.labcorp.ncp.provider.abn.service.impl.AbnServiceImpl.<clinit>(AbnServiceImpl.java:34) 
    at at sun.reflect.GeneratedSerializationConstructorAccessor5.newInstance(Unknown Source) 
    at at java.lang.reflect.Constructor.newInstance(Constructor.java:526) 
    at at org.objenesis.instantiator.sun.SunReflectionFactoryInstantiator.newInstance(SunReflectionFactoryInstantiator.java:40) 
    at at org.objenesis.ObjenesisBase.newInstance(ObjenesisBase.java:59) 
    at at org.mockito.internal.creation.jmock.ClassImposterizer.createProxy(ClassImposterizer.java:128) 
    at at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:63) 
    at at org.mockito.internal.creation.jmock.ClassImposterizer.imposterise(ClassImposterizer.java:56) 
    at at org.mockito.internal.creation.CglibMockMaker.createMock(CglibMockMaker.java:23) 
    at at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:26) 
    at at org.mockito.internal.MockitoCore.mock(MockitoCore.java:51) 
    at at org.mockito.Mockito.mock(Mockito.java:1243) 
    at at org.mockito.Mockito.mock(Mockito.java:1120) 
    at at com.labcorp.ncp.provider.abn.service.AbnServiceTest.invalidDxCode(AbnServiceTest.java:61) 
    at at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at at java.lang.reflect.Method.invoke(Method.java:606) 
    at at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) 
    at at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
    at at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) 
    at at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
    at at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) 
    at at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) 
    at at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) 
    at at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) 
    at at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) 
    at at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) 
    at at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) 
    at at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) 
    at at org.junit.runners.ParentRunner.run(ParentRunner.java:309) 
    at at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:367) 
    at at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:274) 
    at at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238) 
    at at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:161) 
    at at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:290) 
    at at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:242) 
    at at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121) 
14:22:08,316 |-ERROR in ch.qos.logback.core.joran.conditional.IfAction - Failed to determine "if then else" result 
14:22:08,316 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 
14:22:08,318 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 
14:22:08,324 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 
14:22:08,365 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender] 

Answer 1

最高限定的條件是由Janino執行的Groovy腳本。事情是這樣的：

String script = "public boolean evaluate() { return \"test\".equals(\"test\"); }"; 

    ClassBodyEvaluator classBodyEvaluator = new ClassBodyEvaluator(); 
    classBodyEvaluator.setImplementedInterfaces(new Class[] { Condition.class }); 
    classBodyEvaluator.setExtendedClass(PropertyWrapperForScripts.class); 
    classBodyEvaluator.setParentClassLoader(ClassBodyEvaluator.class.getClassLoader()); 

    StringReader sr = new StringReader(script); 
    classBodyEvaluator.cook(null, sr); 
    Class clazz = classBodyEvaluator.getClazz(); 
    Condition instance = (Condition) clazz.newInstance(); 

所以，你只需要確保該條件的值（代入腳本）引述串即"..."。通過ch.qos.logback.core.joran.conditional.PropertyEvalScriptBuilder

public boolean evaluate() { return "test".equals("test"); } 

...執行：但是，因爲你是在XML中限定條件必須轉義引號，像這樣：

<if condition="&quot;test&quot;.equals(&quot;test&quot;)"> 

這將產生一個腳本。

我已經驗證了這一點如下...

<if condition="&quot;test&quot;.equals(&quot;test&quot;)"> 
    <then> 
     <property name="conditionalValue" value="Conditional value is true"/> 
    </then> 
    <else> 
     <property name="conditionalValue" value="Conditional value is false"/> 
    </else> 
</if> 

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> 
    <encoder> 
     <pattern> 
      %d|%-5p|%t|${conditionalValue}%n 
     </pattern> 
    </encoder> 
</appender> 

...並通過該附加目的地寫日誌事件看起來像：

2017-08-09 09:07:02,699|INFO |main|Conditional value is true