策略模式处理不同邮箱异常

顶层策略接口

package strategy;

public interface MailExceptionStrategy {
    void handleException();
}

qq邮箱异常处理策略

package strategy;

public class QQExceptionStrategy implements  MailExceptionStrategy{
    public void handleException() {
        System.out.println("this is QQMailException!");
    }
}

outlook邮箱处理策略

package strategy;

public class OutlookExceptionStrategy  implements  MailExceptionStrategy{
    public void handleException() {
        System.out.println("this is outlookMailException!");
    }
}

新增的网易邮箱异常处理策略

package strategy;

public class NeteaseExceptionStrategy implements MailExceptionStrategy{
    @Override
    public void handleException() {
        System.out.println("this is 163Exception");
    }
}

策略上下文

package strategy;

public class MailExceptionStrategyContext {
    private MailExceptionStrategy strategy;

    public void handle(MailExceptionStrategy strategy){
        this.strategy=strategy;
        strategy.handleException();
    }

    public void handle(String emailAddress){
        final String mailType = MailType.getTypeByEmailAddress(emailAddress);
        final MailExceptionStrategy strategy = getStrategyByMailType(mailType);
        handle(strategy);
    }
    private MailExceptionStrategy getStrategyByMailType(String mailType){
        if (MailType.QQ.getEmailType().equals(mailType)){
            return new QQExceptionStrategy();
        }else if (MailType.OUTLOOK.getEmailType().equals(mailType)){
            return new OutlookExceptionStrategy();
        }else if (MailType.NETEASE.getEmailType().equals(mailType)){
            return new NeteaseExceptionStrategy();
        } else {
            return new DefaultExceptionStrategy();
        }
    }
}

邮箱类型枚举类

package strategy;

public enum MailType {
    QQ("qq邮箱","qq"),
    OUTLOOK("outlook邮箱","outlook"),
    NETEASE("网易邮箱","163"),


    UNKNOWN("未知邮箱","unknown")
    ;
    private String name;
    private String emailType;

    MailType(String name, String emailType) {
        this.name = name;
        this.emailType = emailType;
    }

    public String getName() {
        return name;
    }

    public String getEmailType() {
        return emailType;
    }

    public static String getTypeByEmailAddress(String emailAddress){
        for (MailType mailType : MailType.values()) {
           if (emailAddress.contains(mailType.getEmailType())){
               System.out.println("this email type is "+mailType.getEmailType());
               return mailType.getEmailType();
           }
        }
        System.out.println("this email type is "+MailType.UNKNOWN.getEmailType());
        return MailType.UNKNOWN.getEmailType();
    }
}

运行主类

package strategy;

public class MailRun {
    public static void main(String[] args) {
        String qqMail="[email protected]";
        String outlookMail="[email protected]";
        String unknownMail="[email protected]";
        MailExceptionStrategyContext context=new MailExceptionStrategyContext();
        context.handle(unknownMail);
    }
}