[英]Groovy JsonBuilder: using field names that are variable names too
我正在使用groovy.json.JsonBuilder
并且在指定字段名(在当前作用域中也是变量名)时遇到麻烦。
这有效:
System.out.println(new GroovyShell().evaluate(
"def builder = new groovy.json.JsonBuilder();"
+ "def age = 23;"
+ "builder.example {"
+ " name 'Fred';"
+ " 'age1' 27;"
+ " blah {"
+ " foo 'bar';"
+ " };"
+ "};"
+ "return builder.toPrettyString()"));
并产生输出:
{
"example": {
"name": "Fred",
"age1": 27,
"blah": {
"foo": "bar"
}
}
}
但这失败了(字段“ age”由于某种原因与变量冲突):
System.out.println(new GroovyShell().evaluate(
"def builder = new groovy.json.JsonBuilder();"
+ "def age = 23;"
+ "builder.example {"
+ " name 'Fred';"
+ " 'age' 27;"
+ " blah {"
+ " foo 'bar';"
+ " };"
+ "};"
+ "return builder.toPrettyString()"));
并产生一个异常:
groovy.lang.MissingMethodException: No signature of method: java.lang.Integer.call() is applicable for argument types: (Integer) values: [27]
Possible solutions: wait(), abs(), any(), wait(long), wait(long, int), max(int, int)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:72)
at org.codehaus.groovy.runtime.callsite.PojoMetaClassSite.call(PojoMetaClassSite.java:48)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
at Script1$_run_closure1.doCall(Script1.groovy:5)
at Script1$_run_closure1.doCall(Script1.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:104)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:326)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1041)
at groovy.lang.Closure.call(Closure.java:421)
at groovy.lang.Closure.call(Closure.java:415)
at groovy.json.JsonDelegate.cloneDelegateAndGetContent(JsonDelegate.java:91)
at groovy.json.JsonBuilder.invokeMethod(JsonBuilder.java:314)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:47)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:128)
at Script1.run(Script1.groovy:3)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:444)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:482)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:453)
我不想更改变量的名称。 有什么方法可以强制JsonBuilder接受字段名称? 如您所见,我试图将其用引号引起来,但这没有帮助。
使用delegate.age
来引用周围的闭包,而不是引用变量。
System.out.println(new GroovyShell().evaluate(
"def builder = new groovy.json.JsonBuilder();"
+ "def age = 23;"
+ "builder.example {"
+ " name 'Fred';"
+ " delegate.age 27;"
+ " blah {"
+ " foo 'bar';"
+ " };"
+ "};"
+ "return builder.toPrettyString()"));
应该给你
{
"example": {
"name": "Fred",
"age": 27,
"blah": {
"foo": "bar"
}
}
}
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