添加运行时注解处理器的例子

byhieg · byhieg · commit cac662ae3c8f · 2017-02-14T19:53:18.000+08:00
diff --git a/src/main/java/cn/byhieg/annotationstutorial/AConstructorProcess.java b/src/main/java/cn/byhieg/annotationstutorial/AConstructorProcess.java
@@ -0,0 +1,31 @@
+package cn.byhieg.annotationstutorial;
+
+import javax.jws.soap.SOAPBinding;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+public class AConstructorProcess {
+
+    public static void init(Object object) throws IllegalAccessException, InvocationTargetException, InstantiationException {
+        if (object instanceof User) {
+            Class clz = object.getClass();
+            Constructor [] constructors = clz.getConstructors();
+            for (Constructor constructor : constructors) {
+                if (constructor.isAnnotationPresent(AConstructor.class)) {
+                    AConstructor aConstructor = (AConstructor) constructor.getAnnotation(AConstructor.class);
+                    String name = aConstructor.initName();
+                    int age = aConstructor.initAge();
+                    ((User) object).name = name;
+                    ((User) object).age = age;
+                }
+            }
+        }else{
+            throw new RuntimeException("无法向下转型到指定类");
+        }
+
+    }
+}
diff --git a/src/main/java/cn/byhieg/annotationstutorial/AMethod.java b/src/main/java/cn/byhieg/annotationstutorial/AMethod.java
@@ -0,0 +1,18 @@
+package cn.byhieg.annotationstutorial;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface AMethod {
+    public String method();
+
+    public String value();
+}
diff --git a/src/main/java/cn/byhieg/annotationstutorial/AMethodProcess.java b/src/main/java/cn/byhieg/annotationstutorial/AMethodProcess.java
@@ -0,0 +1,34 @@
+package cn.byhieg.annotationstutorial;
+
+import sun.jvm.hotspot.runtime.amd64.AMD64CurrentFrameGuess;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+public class AMethodProcess {
+
+    public static void initMethod(Object object) throws InvocationTargetException, IllegalAccessException {
+        if (object instanceof User) {
+            Class clz = object.getClass();
+            Method [] methods = clz.getDeclaredMethods();
+            for (Method method : methods) {
+                if (method.isAnnotationPresent(AMethod.class)) {
+                    if(Modifier.isPrivate(method.getModifiers())){
+                        method.setAccessible(true);
+                    }else {
+                        AMethod aMethod =  method.getAnnotation(AMethod.class);
+                        System.out.println(aMethod.method() + "时间为 " + aMethod.value());
+                        method.invoke(object);
+                    }
+                }
+            }
+        }else {
+            throw new RuntimeException("无法向下转型成指定类");
+        }
+    }
+}
diff --git a/src/main/java/cn/byhieg/annotationstutorial/User.java b/src/main/java/cn/byhieg/annotationstutorial/User.java
@@ -0,0 +1,27 @@
+package cn.byhieg.annotationstutorial;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+public class User {
+
+    public String name;
+    public int age;
+
+    @AConstructor
+    public User(){
+
+    }
+
+    @Override
+    public String toString() {
+        return "名字是 " + name + "年龄是 " + age;
+    }
+
+    @AMethod(method = "Sleep",value = "60m")
+    public void doSomeThing(){
+        System.out.println("做一些事情");
+    }
+
+}
diff --git a/src/test/java/cn/byhieg/annotationstutorialtest/AConstructorProcessTest.java b/src/test/java/cn/byhieg/annotationstutorialtest/AConstructorProcessTest.java
@@ -0,0 +1,18 @@
+package cn.byhieg.annotationstutorialtest;
+
+import cn.byhieg.annotationstutorial.AConstructorProcess;
+import cn.byhieg.annotationstutorial.User;
+import junit.framework.TestCase;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+public class AConstructorProcessTest extends TestCase {
+    public void testInit() throws Exception {
+        User user = new User();
+        AConstructorProcess.init(user);
+        System.out.println(user.toString());
+    }
+
+}
diff --git a/src/test/java/cn/byhieg/annotationstutorialtest/AMethodProcessTest.java b/src/test/java/cn/byhieg/annotationstutorialtest/AMethodProcessTest.java
@@ -0,0 +1,16 @@
+package cn.byhieg.annotationstutorialtest;
+
+import cn.byhieg.annotationstutorial.AMethodProcess;
+import cn.byhieg.annotationstutorial.User;
+import junit.framework.TestCase;
+
+/**
+ * Created by byhieg on 17/2/14.
+ * Mail to byhieg@gmail.com
+ */
+public class AMethodProcessTest extends TestCase {
+    public void testInitMethod() throws Exception {
+        AMethodProcess.initMethod(new User());
+    }
+
+}
