这是一个可以极大简化 Java 反射的复杂操作的工具,适用于 Kotlin & Java
This is a tool that greatly simplifies the complex operations of Java reflection for Kotlin & Java.
如果你需要大量操作反射,那么下面的方法可以帮你节省很多时间:
If you need to use reflection a lot, then the following methods can save you a lot of time
- 获得类 / Get Class
val static = Sample::class.new // 只可以访问静态成员 / Only static members can be accessed
val instance = Sample::class.new(1) // 创建了实例,静态和非静态成员均可访问 / Instances are created, both static and non-static members are accessible
- 访问函数 / Invoke Method
static.method("staticPrivate")(1, 2) // 访问双参静态函数 / call a static function with 2 parameters
instance.method("callPrivate")(1) // 访问单参成员函数 / call a member function with 1 parameter
- 访问属性 / Access Properties
val a = instance.prop<Int>("a") // member property
val b = static.prop<Int>("b") // static property
// 属性委托 / Property Delegation
var c by a
c = 1
log(a.get()) // a.get() = 1
// 获取及修改成员属性 / get and modify member property
a.set(2)
println(a.get()) // 2
// 获取及修改静态属性 / get and modify static property
b.set(3)
println(b.get()) // 3
repositories {
mavenCentral()
}
implementation("io.github.zsqw123:cat-reflect:$version")
反射的第一步是需要获取 CatClass
,它是 java.lang.Class
的包装类,可以通过 Class/KClass 来创建它,也可以使用任意一个已初始化的对象来创建 CatClass
对象并绑定实例:
The first step in reflection is to get CatClass
, which is a wrapper class for java.lang.Class
and can be created by Class/KClass or by using any of the initialized objects to
create a CatClass
object and bind the instance:
val Class<*>.new // 从 Class 获取 CatClass / create from Class<*>
val KClass<*>.new // 从 KClass 获取 CatClass / create from KClass<*>
val Any.reflect // 从已初始化对象获取 CatClass 并绑定实例 / using initialized object to create a CatClass and bind this object
// no sugar / Java:
CatClass.from(Class<*>) // `Class<*>.new` Complete call
CatClass.from("class name") // create class by class name
CatClass.fromInstance(Any) // `Any.reflect` Complete call
通过上面的方法就可以得到类,但如果要使用构造函数,那么就需要用到构造器
,构造器的参数类型将被自动推断
,或者手动指定
:
The above method will give you a class, but if you want to use constructors, then you will need to use a constructor whose parameter type will be automatically inferred
,
or manually specified
as follows:
Class<*>.new(1, 2, 3) // Auto type
Class<*>.new[Int::class, Int::class](1, 2) // Manual type
在默认情况下,私有构造函数
也是允许被调用的,如果这不符合您的预期,请使用如下方式来避免反射访问私有构造函数
By default, private constructors
are also allowed to be called, but if this is not what you expect, to avoid reflection access to private constructors as follows:
CatClass.from(Class<*>, true)[Int::class, Int::class](1, 2) // Safe manual type
CatClass.from("class name", true) // safe create class by class name
CatClass.fromInstance(Any, true) // `Any.reflect` Complete call
通过 catClass.method("method name")
获得 CatMethod
/ Get CatMethod
by catClass.method("method name")
:
Class<*>.new.method("awa") // static function
Class<*>.new(1, 2).method("awa") // member function
Class<*>.new.safeMethod("awa") // 使用 safeMethod 避免访问私有函数 / avoid call private function by safeMethod
调用函数可以通过 invoke()
方法调用,也可以省略它,就像普通函数调用一样,函数参数的类型将被自动推断
,或者也可以使用手动指定
:
Calling function can be called by the invoke()
method, or it can be omitted, just like a normal function call, and the type of the function argument will
be automatically inferred
, or it can be manually specified using manually specified
:
method("awa").invoke() // no parameter invoke
method("awa")() // no parameter invoke
method("awa")(1, 2) // Auto type
method("awa")[Int::class, Int::class](1, 2) // Manual type
通过 catClass.prop("value name")
获得 CatValue
/ Get CatValue
by catClass.prop("value name")
:
注意:如果无法确定 Value 的类型,那么写成
Any
也是可以的,但此时 set 和 get 不受静态类型检查约束。
Note: If you can't determine the type of Value, it's okay to write it asAny
, but then set and get are not subject to static type checking.
Class<*>.new.prop<Int>("awa") // static variable
Class<*>.new(1, 2).prop<Int>("awa") // member variable
Class<*>.new.safeProp<Int>("awa") // 使用 safeProp 避免访问变量 / avoid access private variable by safeProp
得到 CatValue 之后可以通过 get/set
方法来操作变量,或使用属性代理:
prop.set(2)
prop.get()
var c by prop // Property Delegation