add @constructor

README_EN.md

@@ -52,11 +52,11 @@ println(new TestClass(1, 2));
 The `@json` scala macro annotation is the quickest way to add a JSON format to your Play project's case classes.
 
 - Note
-    - This annotation is drawn from [json-annotation](https://github.com/kifi/json-annotation) and have some
-      optimization.
-    - It can also be used when there are other annotations on the case classes.
-    - Only an implicit `val` was generated automatically(Maybe generate a companion object if it not exists), and there are no other
-      operations.
+  - This annotation is drawn from [json-annotation](https://github.com/kifi/json-annotation) and have some
+    optimization.
+  - It can also be used when there are other annotations on the case classes.
+  - Only an implicit `val` was generated automatically(Maybe generate a companion object if it not exists), and there are no other
+    operations.
 - Example
 
 ```scala
@@ -78,10 +78,10 @@ Json.fromJson[Person](json)
 The `@builder` used to generate builder pattern for Scala classes.
 
 - Note
-    - Support `case class` / `class`.
-    - If there is no companion object, one will be generated to store the `builder` class and method.
-    - Currying is not supported in constructors at present.
-    
+  - Support `case class` / `class`.
+  - If there is no companion object, one will be generated to store the `builder` class and method.
+  - Currying is not supported in constructors at present.
+
 > IDE support is not very good, a red prompt will appear, but the compilation is OK. It only for the fields in the primary constructor
 
 - Example
@@ -138,7 +138,7 @@ object TestClass1 extends scala.AnyRef {
 The `@synchronized` is a more convenient and flexible synchronous annotation.
 
 - Note
-  - `lockedName` The name of the custom lock obj, default is `this`. 
+  - `lockedName` The name of the custom lock obj, default is `this`.
   - Support static and instance methods.
 
 - Example
@@ -178,8 +178,7 @@ The `@log` does not use mixed or wrapper, but directly uses macro to generate de
     - `io.github.dreamylost.LogType.JLog` use `java.util.logging.Logger`
     - `io.github.dreamylost.LogType.Log4j2` use `org.apache.logging.log4j.Logger`
     - `io.github.dreamylost.LogType.Slf4j` use `org.slf4j.Logger`
-  - Support `class`, `case class` and `object`. 
-    
+  - Support `class`, `case class` and `object`.
 
 > IDE support is not very good, a red prompt will appear, but the compilation is OK. You need to provide their dependencies and configuration, please refer to the test.
 
@@ -212,6 +211,34 @@ The `@apply` used to generate `apply` method for primary construction of ordinar
 println(B2(1, 2))
 ```
 
+## @constructor
+
+The `@constructor` used to generate secondary constructor method for classes.
+
+- Note
+  - `verbose` Whether to enable detailed log.
+  - `excludeFields` Whether to exclude the specified `var` fields, default is `Nil`.
+  - Only support `class`.
+  - Currying is not supported for constructors at present.
+  - When used with `@toString`, it must be put last. Known problems.
+
+> IDE support is not very good, a red prompt will appear, but the compilation is OK. You need to provide their dependencies and configuration, please refer to the test.
+
+- Example
+
+```scala
+@constructor(excludeFields = Seq("c"))
+class A2(int: Int, val j: Int, var k: Option[String] = None, t: Option[Long] = Some(1L)) {
+  private val a: Int = 1
+  var b: Int = 1 //The default value of the field is not carried to the apply parameter, so all parameters are required.
+  protected var c: Int = _
+
+  def helloWorld: String = "hello world"
+}
+
+println(new A2(1, 2, None, None, 100))
+```
+
 # How to use
 
 Add library dependency