Java属性：如何转义＃（散列）

Question

如何转义Java属性文件中的散列符号（#）。

我们有一个使用Java属性文件的国际化框架。

有一个名为数字的列，我们希望它的标头为#。这...

number=# 

...不起作用。

Answer 1

由于Java中的默认转义字符是'\'尝试使用它来转义散列。

Answer 2

这应该没有任何转义字符工作：

number=# 

使用代码刚刚作出了一个小的测试....

prop.load(new FileInputStream ("./res/app.properties")); 
System.out.println("Property: " +prop.getProperty("Number")); 

...和属性文件（注意大/小写）：

Number=# 
Text=test 

结果：

Property: # 

因此请检查您的拼写，小写/大写或进一步处理。

查看更多this或that one（链接Java文档）。

p.s.：虽然不应该要求您也可以尝试Unicode序列：\u0023。

干杯！

Answer 3

我发现这个问题，寻找如何在以下情况下正确逃生时（不工作）：

zendesk.ticket.subject.prefix=#{{ticket.id}}

在这种情况下，它需要转义，否则会出现以下异常：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'createTicketService' defined in file [/Users/***]: Unsatisfied dependency expressed through constructor parameter 6; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'ticket' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public? at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1095) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ... 64 common frames omitted Caused by: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'ticket' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public? at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:164) at org.springframework.beans.factory.support.AbstractBeanFactory.evaluateBeanDefinitionString(AbstractBeanFactory.java:1448) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1088) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ... 78 common frames omitted Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'ticket' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public? at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:226) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:94) at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:81) at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:51) at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:87) at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:120) at org.springframework.expression.spel.ast.InlineList.getValueInternal(InlineList.java:95) at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:131) at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:297) at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:105) at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:42) at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:161) ... 83 common frames omitted

的/中的溶液是使用#{'#'}最终结果是（工程）：

zendesk.ticket.subject.prefix=#{'#'}{{ticket.id}}