Java 属性：如何转义 #（哈希）
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Java Properties: how to escape # (hash)
提问by flybywire
How do I escape the hash sign (#) in Java properties files.
如何转义#Java 属性文件中的井号 ( )。
We have an internationalization framework that uses Java properties files.
我们有一个使用 Java 属性文件的国际化框架。
There is a column called number and we want its header to be #. This ...
有一个名为 number 的列，我们希望它的标题是#. 这 ...
number=#
... doesn't work.
...不起作用。
回答by Trinimon
This one should work without any escape character:
这个应该可以在没有任何转义字符的情况下工作：
number=#
Just made a small test using code ....
刚刚使用代码做了一个小测试......
prop.load(new FileInputStream ("./res/app.properties"));
System.out.println("Property: " +prop.getProperty("Number"));
... and property file (note upper/lower case):
...和属性文件（注意大写/小写）：
Number=#
Text=test
Result:
结果：
Property: #
So rather check your spelling, lower/upper case or further processing.
因此，请检查您的拼写、小写/大写或进一步处理。
Check out thisor that one(linking Java documentation too) for more.
p.s.: though it shouldn't be required you could also try the Unicode sequence: \u0023.
ps：虽然不应该要求你也可以尝试Unicode序列：\u0023。
Cheers!
干杯!
回答by Martin van Wingerden
I found this question when looking how to escape properly in the following case (DOES NOT WORK):
我在查看如何在以下情况下正确逃脱时发现了这个问题（不起作用）：
zendesk.ticket.subject.prefix=#{{ticket.id}}
zendesk.ticket.subject.prefix=#{{ticket.id}}
In this case it needs escaping, otherwise the following exception occurs:
这种情况下需要转义，否则会出现如下异常：
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.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
The / a solution would be to use #{'#'}the end result being (WORKS):
/ 一个解决方案是使用#{'#'}最终结果是 (WORKS)：
zendesk.ticket.subject.prefix=#{'#'}{{ticket.id}}
zendesk.ticket.subject.prefix=#{'#'}{{ticket.id}}
回答by DmiN
As the default escape character in Java is the '\'try to escape the hash with it.
由于 Java 中的默认转义字符是'\'尝试用它来转义哈希。
