003 静态代理

StudentServiceImpl

package com.aistart.service.impl;import com.aistart.mapper.StudentMapper;
import com.aistart.pojo.Student;
import com.aistart.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;/*注解写在实现类中*//*被代理的类,外部不能直接访问,而是让代理访问,目标类*/
public class StudentServiceImpl implements StudentService {@Overridepublic boolean addStu() {/*理论上,这里有个日志*/System.out.println("service调用执行,增加另一个学生");/*理论上,这里有个日志*/return false;}@Overridepublic boolean delStu() {System.out.println("service调用执行,删除另一个学生");return false;}
}

StudentService.java

package com.aistart.service;import com.aistart.pojo.Student;public interface StudentService {boolean addStu();boolean delStu();
}

StudentServiceProxy.java

package com.aistart.proxy;import com.aistart.logger.Logger;
import com.aistart.pojo.Student;
import com.aistart.service.StudentService;/*** 代理类,里面的函数理应与目标类(被代理类,核心类)一致*/
public class StudentServiceProxy implements StudentService {/*目标类*/private StudentService target;/*增强类*/private Logger logger;public StudentServiceProxy(StudentService target, Logger logger) {this.target = target;this.logger = logger;}@Overridepublic boolean addStu() {/*击打日志*/logger.LogInfoBefore();boolean b = target.addStu();//通过当前代理类访问目标类的logger.LogInfoAfter();return false;}@Overridepublic boolean delStu() {logger.LogInfoBefore();boolean b = target.delStu();logger.LogInfoAfter();return false;}
}

StudentServiceProxy1.java

package com.aistart.proxy;import com.aistart.logger.Logger;
import com.aistart.service.StudentService;
import com.aistart.service.impl.StudentServiceImpl;/*** 代理类,里面的函数理应与目标类(被代理类,核心类)一致*/
public class StudentServiceProxy1 extends StudentServiceImpl {/*目标类*/private StudentService target;/*增强类*/private Logger logger;public StudentServiceProxy1(StudentService target, Logger logger) {this.target = target;this.logger = logger;}@Overridepublic boolean addStu() {/*击打日志*/logger.LogInfoBefore();boolean b = target.addStu();//通过当前代理类访问目标类的logger.LogInfoAfter();return false;}@Overridepublic boolean delStu() {logger.LogInfoBefore();boolean b = target.delStu();logger.LogInfoAfter();return false;}
}

StudentServiceProxyTest.java

package com.aistart.proxy;import com.aistart.logger.Logger;
import com.aistart.service.StudentService;
import com.aistart.service.impl.StudentServiceImpl;
import org.junit.Test;import java.lang.reflect.Proxy;import static org.junit.Assert.*;public class StudentServiceProxyTest {@Testpublic void addStu() {/*去测试,也就是直接访问,代理对象而不是访问目标*//*获取当前的目标对象*/StudentServiceImpl target = new StudentServiceImpl();/*获取增强的类*/Logger logger = new Logger();StudentService studentServiceProxy = new StudentServiceProxy(target, logger);studentServiceProxy.addStu();}}