refactor:增加cglib 基类测试其结果。证明代理类生成过程以执行过程

Author: maxy19

.gitignore

@@ -0,0 +1,105 @@
+# Created by .ignore support plugin (hsz.mobi)
+### Example user template template
+### Example user template
+
+# IntelliJ project files
+.idea
+*.iml
+out
+gen
+target
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Java template
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+

pom.xml

@@ -88,7 +88,7 @@
         <dependency>
             <groupId>cglib</groupId>
             <artifactId>cglib</artifactId>
-            <version>3.2.10</version>
+            <version>3.3.0</version>
         </dependency>
 
 

src/main/com/mxy/design/proxy/IStudent.java renamed to src/main/com/mxy/design/proxy/ISchool.java

@@ -1,6 +1,6 @@
 package com.mxy.design.proxy;
 
-public interface IStudent {
+public interface ISchool {
 
     void save();
 

src/main/com/mxy/design/proxy/SchoolImpl.java

@@ -0,0 +1,18 @@
+package com.mxy.design.proxy;
+
+public class SchoolImpl implements ISchool {
+
+    public SchoolImpl(){
+        //JDK动态代理通过反射会调用这个方法
+        System.out.println(SchoolImpl.class+":JDK 动态代理反射调用。");
+    }
+    @Override
+    public void save() {
+        System.out.println("保存学校信息ing");
+    }
+
+    @Override
+    public void delete() {
+        System.out.println("删除学校信息ing");
+    }
+}

src/main/com/mxy/design/proxy/SchoolProxy.java

@@ -0,0 +1,28 @@
+package com.mxy.design.proxy;
+
+/**
+ * 重点类 静态代理 实现目标接口
+ */
+public class SchoolProxy implements ISchool {
+
+    private ISchool student;
+
+    public SchoolProxy(ISchool iSchool) {
+        this.student = iSchool;
+    }
+
+    @Override
+    public void save() {
+        System.out.println("==开启事务");
+        student.save();
+        System.out.println("==提交事务");
+    }
+
+    @Override
+    public void delete() {
+        //查询是否存在
+        System.out.println("===开启事务");
+        student.delete();
+        System.out.println("===提交事务");
+    }
+}

src/main/com/mxy/design/proxy/StudentImpl.java

@@ -7,17 +7,28 @@
 import java.lang.reflect.Method;
 
 /**
- * 动态代理 实现JDK 接口
+ * 动态代理 实现GGLIB 接口
+ * 注意：
+ * CGLIB是针对类实现代理，主要是对指定的类生成一个子类，覆盖其中的方法，
+ * 并覆盖其中方法实现增强，但是因为采用的是继承，所以该类或方法最好不要声明成final，
+ * 对于final类或方法，是无法继承的。
  */
 public class StudentCglibProxy implements MethodInterceptor {
-
+    /**
+     * CGLib需要代理的目标对象
+     */
+    private Object target;
 
     @Override
-    public Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable {
-        return methodProxy.invokeSuper(o, objects);
+    public Object intercept(Object obj, Method method, Object[] args, MethodProxy methodProxy) throws Throwable {
+        //可能造成死循环坑：而如果调用invokeSuper方法，则一定要使用被代理后的obj对象
+        //return methodProxy.invokeSuper(obj, args);
+        //可能造成死循环坑：如果是用invoke方法一定要使用被代理的对象也就是上文中的target
+        return methodProxy.invoke(target, args);
     }
 
-    public  <T> T getInstance(Class<T> objClass) {
-        return (T)Enhancer.create(objClass.getClass(), this);
+    public <T> T getInstance(Object target) {
+        this.target = target;
+        return (T) Enhancer.create(target.getClass(), this);
     }
 }