利用责任链模式构建数据校验模块

这是一个比较简单的表单校验,利用责任链模式将多个数据校验以“链”的形式串联起来。
目前支持三种数据校验(可拓展)
1.空数据校验
2.数据格式校验
3.非必填项校验

代码:定义校验器

public interface Verify {
    //校验
    boolean doVerify();
    //设置下个校验器
    void setNextVerify(Verify verify);
    //显示错误信息
    boolean showErrorMsg(String errorMsg);
    //执行校验回调(提供支持,项目未使用到)
    interface VerifyCallBack {
        //成功
        void sussecc();
        //失败
        void failure();
    }
}

抽象校验器

public abstract class AbsVerify implements Verify {

    protected String data;//校验数据
    protected String errorMsg;//失败信息

    protected Verify nextVerify;   //下个执行的校验器
    protected VerifyCallBack callBack;

    public AbsVerify(String data, String errorMsg) {
        this.data = data;
        this.errorMsg = errorMsg;
    }
    
    public void setNextVerify(Verify verify) {
        this.nextVerify = verify;
    }
    
    @Override
    public boolean showErrorMsg(String errorMsg) {
        if (callBack != null) {
            callBack.failure();
        }
        if (!isEmpty(errorMsg)) {
            System.out.println(errorMsg);
        }
        return false;
    }
    
    //执行下一个校验
    protected boolean doNextFilter() {
        if (callBack != null) {
            callBack.sussecc();
        }
        return nextVerify != null ? nextVerify.doVerify() : true;
    }
    
    //是否为空
    protected boolean isEmpty(String msg) {
        return StringUtil.isBlank(msg);
    }
    
    public VerifyCallBack getCallBack() {
        return callBack;
    }
    
    public void setCallBack(VerifyCallBack callBack) {
        this.callBack = callBack;
    }
}

空数据校验

public class EmptyVerify extends AbsVerify {

    public EmptyVerify(String data, String errorMsg) {
        super(data, errorMsg);
    }

    @Override
    public boolean doVerify() {
        return isEmpty(data) ? showErrorMsg(errorMsg) : doNextFilter();
    }
}

数据格式校验(使用正则表达式)

public class RegularVerify extends AbsVerify {

    protected String regular;//正则表达式

    public RegularVerify(String data, String regular, String errorMsg) {
        super(data,errorMsg);
        this.regular = regular;
    }

    //是否允许为空
    protected boolean allowEmpty() {
        return false;
    }

    @Override
    public boolean doVerify() {
        if (isEmpty(data)) {
            return allowEmpty() ? doNextFilter() : showErrorMsg(errorMsg);
        }
        return matcher() ? doNextFilter() : showErrorMsg(errorMsg);
    }

    //正则表达式
    private boolean matcher() {
        Pattern p = Pattern.compile(regular);
        Matcher m = p.matcher(data);
        return m.matches();
    }
}

非必填项校验

public class AllowEmptyVerify extends RegularVerify {

    public AllowEmptyVerify(String data, String regular, String errorMsg) {
        super(data, regular, errorMsg);
    }

    @Override
    protected boolean allowEmpty() {
        return true;
    }
}

 

校验管理

public class VerifyManger {

    //校验器集合
    private List verifies = new ArrayList<>();

    //添加校验器
    public VerifyManger addVerify (Verify verify) {
        verifies.add(verify);
        return this;
    }

    //执行校验器
    public boolean execute() {
        if (verifies.isEmpty()) {
            return true;
        }
        int size = verifies.size();
        if (size == 1) {
            return verifies.get(0).doVerify();
        }
        for (int i = 0; i < size; i++) {
            Verify verify = verifies.get(i);
            if (i + 1 < size) {
                verify.setNextVerify(verifies.get(i + 1));
            }
        }
        return verifies.get(0).doVerify();
    }
}

 

正则表达式

public class Regular {

    //密码(以字母开头,长度在6~18之间,只能包含字母、数字和下划线)
    public static final String PASSWORD = "^[a-zA-Z]\\w{6,18}$";
    //用户名(中文、英文、数字包括下划线)
    public static final String NAME = "^[\\u4E00-\\u9FA5A-Za-z0-9_]+$";
    //手机号
    public static final String PHONE = "^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\\d{8}$";

}

 

使用案例场景

 

登录界面用户需要填写用户名(必填)、密码(必填)、手机号(非必填),点击登录进行校验

public class Test {
    static String name = "童心未泯佐为";
    static String password = "qqwwee123";
    static String phone = "";

    public static void main(String args[]) {

        boolean execute = new VerifyManger()
                .addVerify(new EmptyVerify(name, "请填写用户名"))
                .addVerify(new RegularVerify(name, Regular.NAME, "用户名格式不正确"))

                .addVerify(new EmptyVerify(password, "请填写密码"))
                .addVerify(new RegularVerify(password, Regular.PASSWORD, "密码格式不正确"))

                .addVerify(new AllowEmptyVerify(phone, Regular.PHONE, "手机号格式不正确"))//非必填 允许为空 有值校验
                .execute();
        if (execute) {
            System.out.println("校验通过");
        }
    }
}

结果

校验通过

 

 

 

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