Mybatis实现接口自动生成实现类完成Dao层CRUD操作-----Mybatis框架

短命女 2024-03-05 00:41 82阅读 0赞

>     --add-opens java.base/java.lang=ALL-UNNAMED
> 
> \--add-opens java.base/java.lang=ALL-UNNAMED
> 
>     --add-opens java.base/sun.net.util=ALL-UNNAMED
> 
> \--add-opens java.base/sun.net.util=ALL-UNNAMED

>     package com.powernode.javassist;
>     
>     import javassist.CannotCompileException;
>     import javassist.ClassPool;
>     import javassist.CtClass;
>     import javassist.CtMethod;
>     import org.junit.Test;
>     
>     import java.lang.reflect.Constructor;
>     import java.lang.reflect.Method;
>     
>     public class JavassistTest
>     {
>         @Test
>         public void TestGenerateFirstClass() throws Exception
>         {
>             //获取类池,用于生成Class
>             ClassPool pool = ClassPool.getDefault();
>             //需要完整全类名
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造方法
>             String methodCode = "public void insert(){System.out.println(123);}";
>             CtMethod ctMethod = CtMethod.make(methodCode,ctClass);
>             //将方法添加到类中
>             ctClass.addMethod(ctMethod);
>             //生成类(在内存中生成class)
>             ctClass.toClass();
>             //类加载返回AccountDaoImpl的字节码
>             Class<?> aClass = Class.forName("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //创建对象
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             Object o = declaredConstructor.newInstance();
>             //获取AccountDaoImpl的Insert方法
>             Method insert = aClass.getDeclaredMethod("insert");
>             insert.invoke(o);
>         }
>     }
> 
>     package com.powernode.javassist;
>     
>     import javassist.CannotCompileException;
>     import javassist.ClassPool;
>     import javassist.CtClass;
>     import javassist.CtMethod;
>     import org.junit.Test;
>     
>     import java.lang.reflect.Constructor;
>     import java.lang.reflect.Method;
>     
>     public class JavassistTest
>     {
>         @Test
>         public void TestGenerateFirstClass() throws Exception
>         {
>             //获取类池,用于生成Class
>             ClassPool pool = ClassPool.getDefault();
>             //需要完整全类名
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造方法
>             String methodCode = "public void insert(){System.out.println(123);}";
>             CtMethod ctMethod = CtMethod.make(methodCode,ctClass);
>             //将方法添加到类中
>             ctClass.addMethod(ctMethod);
>             //生成类(在内存中生成class)
>             ctClass.toClass();
>             //类加载返回AccountDaoImpl的字节码
>             Class<?> aClass = Class.forName("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //创建对象
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             Object o = declaredConstructor.newInstance();
>             //获取AccountDaoImpl的Insert方法
>             Method insert = aClass.getDeclaredMethod("insert");
>             insert.invoke(o);
>         }
>     }

>     <?xml version="1.0" encoding="UTF-8"?>
>     <project xmlns="http://maven.apache.org/POM/4.0.0"
>              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>              xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
>         <modelVersion>4.0.0</modelVersion>
>     
>         <groupId>com.powernode</groupId>
>         <artifactId>javassist-Test</artifactId>
>         <version>1.0-SNAPSHOT</version>
>         <packaging>jar</packaging>
>         <dependencies>
>             <dependency>
>                 <groupId>org.javassist</groupId>
>                 <artifactId>javassist</artifactId>
>                 <version>3.29.1-GA</version>
>             </dependency>
>             <dependency>
>                 <groupId>junit</groupId>
>                 <artifactId>junit</artifactId>
>                 <version>4.13.2</version>
>                 <scope>test</scope>
>             </dependency>
>         </dependencies>
>         <properties>
>             <maven.compiler.source>17</maven.compiler.source>
>             <maven.compiler.target>17</maven.compiler.target>
>             <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
>         </properties>
>     
>     </project>
> 
>     <?xml version="1.0" encoding="UTF-8"?>
>     <project xmlns="http://maven.apache.org/POM/4.0.0"
>              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>              xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
>         <modelVersion>4.0.0</modelVersion>
>     
>         <groupId>com.powernode</groupId>
>         <artifactId>javassist-Test</artifactId>
>         <version>1.0-SNAPSHOT</version>
>         <packaging>jar</packaging>
>         <dependencies>
>             <dependency>
>                 <groupId>org.javassist</groupId>
>                 <artifactId>javassist</artifactId>
>                 <version>3.29.1-GA</version>
>             </dependency>
>             <dependency>
>                 <groupId>junit</groupId>
>                 <artifactId>junit</artifactId>
>                 <version>4.13.2</version>
>                 <scope>test</scope>
>             </dependency>
>         </dependencies>
>         <properties>
>             <maven.compiler.source>17</maven.compiler.source>
>             <maven.compiler.target>17</maven.compiler.target>
>             <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
>         </properties>
>     
>     </project>

>     package com.powernode.javassist;
>     
>     import com.powernode.bank.dao.AccountDao;
>     import javassist.ClassPool;
>     import javassist.CtClass;
>     import javassist.CtMethod;
>     import org.junit.Test;
>     
>     import java.lang.reflect.Constructor;
>     import java.lang.reflect.Method;
>     
>     public class JavassistTest
>     {
>         @Test
>         public void TestGenerateFirstClass() throws Exception
>         {
>             //获取类池,用于生成Class
>             ClassPool pool = ClassPool.getDefault();
>             //需要完整全类名
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造方法
>             String methodCode = "public void insert(){System.out.println(123);}";
>             CtMethod ctMethod = CtMethod.make(methodCode,ctClass);
>             //将方法添加到类中
>             ctClass.addMethod(ctMethod);
>             //生成类(在内存中生成class)
>             ctClass.toClass();
>             //类加载返回AccountDaoImpl的字节码
>             //这里内存里就有这个类了,所以可以使用Class.forName创建class对象
>             Class<?> aClass = Class.forName("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //创建对象
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             Object o = declaredConstructor.newInstance();
>             //获取AccountDaoImpl的Insert方法
>             Method insert = aClass.getDeclaredMethod("insert");
>             insert.invoke(o);
>         }
>         @Test
>         public void TestGenerateImpl() throws Exception
>         {
>             //获取类池
>             ClassPool pool = ClassPool.getDefault();
>             //制造类
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造接口
>             CtClass ctInterface = pool.makeInterface("com.powernode.bank.dao.AccountDao");
>             //添加接口到类中
>             ctClass.addInterface(ctInterface);//相当于AccountDaoImpl去implements接口AccountDao
>             //实现接口的方法(制造方法先)
>             //制造方法
>             CtMethod ctMethod = CtMethod.make("public void delete(){System.out.println(\"hello delete!\");}", ctClass);
>             ctClass.addMethod(ctMethod);
>             //在内存中生成类(同时将生成的类加载到JVM中)
>             Class<?> aClass = ctClass.toClass();
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             AccountDao accountDao = (AccountDao)declaredConstructor.newInstance();
>             accountDao.delete();
>         }
>     }
> 
>     package com.powernode.javassist;
>     
>     import com.powernode.bank.dao.AccountDao;
>     import javassist.ClassPool;
>     import javassist.CtClass;
>     import javassist.CtMethod;
>     import org.junit.Test;
>     
>     import java.lang.reflect.Constructor;
>     import java.lang.reflect.Method;
>     
>     public class JavassistTest
>     {
>         @Test
>         public void TestGenerateFirstClass() throws Exception
>         {
>             //获取类池,用于生成Class
>             ClassPool pool = ClassPool.getDefault();
>             //需要完整全类名
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造方法
>             String methodCode = "public void insert(){System.out.println(123);}";
>             CtMethod ctMethod = CtMethod.make(methodCode,ctClass);
>             //将方法添加到类中
>             ctClass.addMethod(ctMethod);
>             //生成类(在内存中生成class)
>             ctClass.toClass();
>             //类加载返回AccountDaoImpl的字节码
>             //这里内存里就有这个类了,所以可以使用Class.forName创建class对象
>             Class<?> aClass = Class.forName("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //创建对象
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             Object o = declaredConstructor.newInstance();
>             //获取AccountDaoImpl的Insert方法
>             Method insert = aClass.getDeclaredMethod("insert");
>             insert.invoke(o);
>         }
>         @Test
>         public void TestGenerateImpl() throws Exception
>         {
>             //获取类池
>             ClassPool pool = ClassPool.getDefault();
>             //制造类
>             CtClass ctClass = pool.makeClass("com.powernode.bank.dao.impl.AccountDaoImpl");
>             //制造接口
>             CtClass ctInterface = pool.makeInterface("com.powernode.bank.dao.AccountDao");
>             //添加接口到类中
>             ctClass.addInterface(ctInterface);//相当于AccountDaoImpl去implements接口AccountDao
>             //实现接口的方法(制造方法先)
>             //制造方法
>             CtMethod ctMethod = CtMethod.make("public void delete(){System.out.println(\"hello delete!\");}", ctClass);
>             ctClass.addMethod(ctMethod);
>             //在内存中生成类(同时将生成的类加载到JVM中)
>             Class<?> aClass = ctClass.toClass();
>             Constructor<?> declaredConstructor = aClass.getDeclaredConstructor();
>             AccountDao accountDao = (AccountDao)declaredConstructor.newInstance();
>             accountDao.delete();
>         }
>     }