设计模式课程 设计模式精讲 12-2 适配器模式coding

1　　　　重要

1.1　　类适配器和对象适配器最大的区别

2　　　　代码演练

2.1　　代码演练1（类适配器模式）

2.2　　代码演练2（对象适配模式）

2.3　　代码演练3（具体应用场景）

1　　　　重要

1.1　　类适配器和对象适配器最大的区别

类适配器通过继承关系达到适配的目的，而对象适配器通过组合达到适配目的。

2　　　　代码演练

2.1　　代码演练1（类适配器模式）

需求相关：

a类和b类，想用b类或者b类的子类实现a类的方法

设计分析：

适配器类c继承了被适配器类a并且实现了目标类b的接口，通过适配器类c把被适配者a的方法适配给了目标类b；

适配器类c是被适配者a的子类，通过调用父类的方法实现了目标类b

UML类图：

 

测试类：

package com.geely.design.pattern.structural.adapter.classadapter;

public class Test {
    public static void main(String [] args){
        //打印目标类的方法
        Target target = new ConcreteTarget();
        target.request();


        //打印适配器的方法
        Adapter adapter = new Adapter();
        adapter.request();

    }
}

适配器类Adapter:

package com.geely.design.pattern.structural.adapter.classadapter;

public class Adapter extends Adaptee implements Target {
    @Override
    public void request() {
        super.adapteeRequest();
    }
}

目标接口Target：

package com.geely.design.pattern.structural.adapter.classadapter;

/**
 * 目标接口
 */
public interface Target {
    void request();
}

目标实现类ConCreteTarget：

package com.geely.design.pattern.structural.adapter.classadapter;

/**
 * 目标实现类
 */
public class ConcreteTarget implements Target {
    @Override
    public void request() {
        System.out.println("目标实现类自己的方法，，，");
    }
}

被适配者类Adaptee：

package com.geely.design.pattern.structural.adapter.classadapter;

/**
 * 该类是被适配者，想实现目标类的方法
 */
public class Adaptee {
    public void adapteeRequest(){
        System.out.println("被适配器执行它自己的方法。。。");
    }
}

打印日志：

"C:Program FilesJavajdk1.7.0_79injava.exe" "-javaagent:D:javadevolopKitideaanZhIntelliJ IDEA Community Edition 2018.1.4libidea_rt.jar=33436:D:javadevolopKitideaanZhIntelliJ IDEA Community Edition 2018.1.4in" -Dfile.encoding=UTF-8 -classpath "C:Program FilesJavajdk1.7.0_79jrelibcharsets.jar;C:Program FilesJavajdk1.7.0_79jrelibdeploy.jar;C:Program FilesJavajdk1.7.0_79jrelibextaccess-bridge-64.jar;C:Program FilesJavajdk1.7.0_79jrelibextdnsns.jar;C:Program FilesJavajdk1.7.0_79jrelibextjaccess.jar;C:Program FilesJavajdk1.7.0_79jrelibextlocaledata.jar;C:Program FilesJavajdk1.7.0_79jrelibextsunec.jar;C:Program FilesJavajdk1.7.0_79jrelibextsunjce_provider.jar;C:Program FilesJavajdk1.7.0_79jrelibextsunmscapi.jar;C:Program FilesJavajdk1.7.0_79jrelibextzipfs.jar;C:Program FilesJavajdk1.7.0_79jrelibjavaws.jar;C:Program FilesJavajdk1.7.0_79jrelibjce.jar;C:Program FilesJavajdk1.7.0_79jrelibjfr.jar;C:Program FilesJavajdk1.7.0_79jrelibjfxrt.jar;C:Program FilesJavajdk1.7.0_79jrelibjsse.jar;C:Program FilesJavajdk1.7.0_79jrelibmanagement-agent.jar;C:Program FilesJavajdk1.7.0_79jrelibplugin.jar;C:Program FilesJavajdk1.7.0_79jrelib
esources.jar;C:Program FilesJavajdk1.7.0_79jrelib
t.jar;F:xiangmu3XinIdeadesign_pattern	argetclasses;F:xiangmu3XinIdeadesign_Maven_Homeliborgapache	omcat	omcat-servlet-api7.0.64	omcat-servlet-api-7.0.64.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-webmvc4.0.3.RELEASEspring-webmvc-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-beans4.0.3.RELEASEspring-beans-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-context4.0.3.RELEASEspring-context-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-aop4.0.3.RELEASEspring-aop-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homelibaopallianceaopalliance1.0aopalliance-1.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-core4.0.3.RELEASEspring-core-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-expression4.0.3.RELEASEspring-expression-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-web4.0.3.RELEASEspring-web-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-oxm4.0.3.RELEASEspring-oxm-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-jdbc4.0.3.RELEASEspring-jdbc-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-tx4.0.3.RELEASEspring-tx-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworkspring-test4.0.3.RELEASEspring-test-4.0.3.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgaspectjaspectjweaver1.7.3aspectjweaver-1.7.3.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgmybatismybatis-spring1.3.0mybatis-spring-1.3.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgmybatismybatis3.4.1mybatis-3.4.1.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgaspectjaspectjrt1.6.11aspectjrt-1.6.11.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgcodehausjacksonjackson-mapper-asl1.9.12jackson-mapper-asl-1.9.12.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgcodehausjacksonjackson-core-asl1.9.12jackson-core-asl-1.9.12.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-dbcpcommons-dbcp1.4commons-dbcp-1.4.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-poolcommons-pool1.5.4commons-pool-1.5.4.jar;F:xiangmu3XinIdeadesign_Maven_Homelibchqoslogbacklogback-classic1.1.2logback-classic-1.1.2.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgslf4jslf4j-api1.7.6slf4j-api-1.7.6.jar;F:xiangmu3XinIdeadesign_Maven_Homelibchqoslogbacklogback-core1.1.2logback-core-1.1.2.jar;F:xiangmu3XinIdeadesign_Maven_Homelibmysqlmysql-connector-java5.1.6mysql-connector-java-5.1.6.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgoogleguavaguava20.0guava-20.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgapachecommonscommons-lang33.5commons-lang3-3.5.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-collectionscommons-collections3.2.1commons-collections-3.2.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibjunitjunit4.12junit-4.12.jar;F:xiangmu3XinIdeadesign_Maven_Homelibjoda-timejoda-time2.3joda-time-2.3.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborghashidshashids1.0.1hashids-1.0.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-netcommons-net3.1commons-net-3.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-fileuploadcommons-fileupload1.2.2commons-fileupload-1.2.2.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-iocommons-io2.0.1commons-io-2.0.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgithubpagehelperpagehelper4.1.0pagehelper-4.1.0.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgithubmiemiedevmybatis-paginator1.2.17mybatis-paginator-1.2.17.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgithubjsqlparserjsqlparser.9.4jsqlparser-0.9.4.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-codeccommons-codec1.10commons-codec-1.10.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-configurationcommons-configuration1.10commons-configuration-1.10.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-langcommons-lang2.6commons-lang-2.6.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcommons-loggingcommons-logging1.1.1commons-logging-1.1.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgooglezxingcore2.1core-2.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomgooglecodegsongson2.3.1gson-2.3.1.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborghamcresthamcrest-core1.3hamcrest-core-1.3.jar;F:xiangmu3XinIdeadesign_Maven_Homelib
edisclientsjedis2.6.0jedis-2.6.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgapachecommonscommons-pool22.0commons-pool2-2.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgprojectlomboklombok1.16.18lombok-1.16.18.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgspringframeworksessionspring-session-data-redis1.2.5.RELEASEspring-session-data-redis-1.2.5.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborg
edisson
edisson2.9.0
edisson-2.9.0.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-common4.1.8.Final
etty-common-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-codec4.1.8.Final
etty-codec-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-buffer4.1.8.Final
etty-buffer-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-transport4.1.8.Final
etty-transport-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-resolver4.1.8.Final
etty-resolver-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibio
etty
etty-handler4.1.8.Final
etty-handler-4.1.8.Final.jar;F:xiangmu3XinIdeadesign_Maven_Homelibjavaxcachecache-api1.0.0cache-api-1.0.0.jar;F:xiangmu3XinIdeadesign_Maven_Homelibioprojectreactor
eactor-stream2.0.8.RELEASE
eactor-stream-2.0.8.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homelibioprojectreactor
eactor-core2.0.8.RELEASE
eactor-core-2.0.8.RELEASE.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborg
eactivestreams
eactive-streams1.0.0
eactive-streams-1.0.0.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomfasterxmljacksondataformatjackson-dataformat-yaml2.6.7jackson-dataformat-yaml-2.6.7.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgyamlsnakeyaml1.15snakeyaml-1.15.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomfasterxmljacksoncorejackson-core2.6.7jackson-core-2.6.7.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomfasterxmljacksoncorejackson-databind2.6.7jackson-databind-2.6.7.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomfasterxmljacksondataformatjackson-dataformat-avro2.9.0jackson-dataformat-avro-2.9.0.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomfasterxmljacksoncorejackson-annotations2.9.0jackson-annotations-2.9.0.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgapacheavroavro1.8.1avro-1.8.1.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcom	houghtworksparanamerparanamer2.7paranamer-2.7.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgxerialsnappysnappy-java1.1.1.3snappy-java-1.1.1.3.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborgapachecommonscommons-compress1.8.1commons-compress-1.8.1.jar;F:xiangmu3XinIdeadesign_Maven_Homeliborg	ukaanixz1.5xz-1.5.jar;F:xiangmu3XinIdeadesign_Maven_Homelibcomsunfacesjsf-api1.2jsf-api-1.2.jar" com.geely.design.pattern.structural.adapter.classadapter.Test
目标实现类自己的方法，，，
被适配器执行它自己的方法。。。

Process finished with exit code 0

2.2　　代码演练2（对象适配模式）

需求：a类和b类，想用b类或者b类的子类实现a类的方法

设计分析：

通过组合达到目的

关联关系：

只有 适配类发生了变化，其他类都不变。

UML类图：

 

适配器类：

package com.geely.design.pattern.structural.apapter.objectadapter;

public class Adapter implements Target {
    Adaptee adaptee = new Adaptee();

    @Override
    public void request() {
        adaptee.adapteeRequest();
    }
}

测试类：

package com.geely.design.pattern.structural.apapter.objectadapter;

public class Test {
    public static void main(String [] args){
        //打印目标类的方法
        Target target = new ConcreteTarget();
        target.request();


        //打印适配器的方法
        Adapter adapter = new Adapter();
        adapter.request();

    }
}

目标接口：

package com.geely.design.pattern.structural.apapter.objectadapter;

/**
 * 目标接口
 */
public interface Target {
    void request();
}

目标实现类：

package com.geely.design.pattern.structural.apapter.objectadapter;

/**
 * 目标实现类
 */
public class ConcreteTarget implements Target {
    @Override
    public void request() {
        System.out.println("目标实现类自己的方法，，，");
    }
}

被适配类：

package com.geely.design.pattern.structural.apapter.objectadapter;

/**
 * 该类是被适配者，想实现目标类的方法
 */
public class Adaptee {
    public void adapteeRequest(){
        System.out.println("被适配器执行它自己的方法。。。");
    }
}

打印日志：

目标实现类自己的方法，，，
被适配器执行它自己的方法。。。

Process finished with exit code 0

2.3　　代码演练3（具体应用场景）

需求：

手机电源适配器，把220V交流电转化为5V直流电

测试类：

package com.geely.design.pattern.structural.adapter;

public class Test {
    public static void main(String [] args){
        DC5V dc5V = new PowerAdapter();
        dc5V.outPutDC5V();
    }
}

电源适配器类：

package com.geely.design.pattern.structural.adapter;

import com.geely.design.pattern.structural.adapter.AC220V;
import com.geely.design.pattern.structural.adapter.DC5V;

/**
 * 电源适配器
 */
public class PowerAdapter implements DC5V {

    //通过组合引入交流电220V
    AC220V ac220V = new AC220V();

    @Override
    public int outPutDC5V() {
        int adapterInput = ac220V.outputAC220V();

        //变压器转换
        int adapterOutput = adapterInput/44;

        System.out.println("使用电源适配器，最终转换为直流电"+adapterOutput+"V");
        return adapterOutput;
    }
}

目标类直流电5V类：

package com.geely.design.pattern.structural.adapter;

public interface DC5V {
    //输出5V直流电
    int outPutDC5V();
}

被适配器交流电220V类：

package com.geely.design.pattern.structural.adapter;

public class AC220V {
    public int outputAC220V(){
        int outputELE = 220;
        System.out.println("输出交流电"+outputELE+"V");
        return outputELE;
    }
}

打印日志：

输出交流电220V
使用电源适配器，最终转换为直流电5V

Process finished with exit code 0