java 自定义注解（3）

 

注解1：

带参数：

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface TableRef {
    String value();
}

 

注解2：

@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Rowkey {
}

 

 

注解3：

@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Column {
    String family() default "info";
    String column() default  "";
}

 

 

 

java bean:

@Data
@TableRef("ct:calllog")
public class Calllog {
    @Rowkey
    private String rowkey;
    @Column(family = "caller")
    private String call1;
    @Column(family = "caller")
    private String call2;
    @Column(family = "caller")
    private String calltime;
    @Column(family = "caller")
    private String duration;
    @Column(family = "caller")
    private String flg = "1";
}

 

 

 

使用：

    protected void putData(Object obj) throws Exception {

        // 反射
        Class clazz = obj.getClass();
        TableRef tableRef = (TableRef)clazz.getAnnotation(TableRef.class);
        String tableName = tableRef.value();

        Field[] fs = clazz.getDeclaredFields();
        String stringRowkey = "";
        for (Field f : fs) {
            Rowkey rowkey = f.getAnnotation(Rowkey.class);
            if ( rowkey != null ) {
                f.setAccessible(true);
                stringRowkey = (String)f.get(obj);
                break;
            }
        }

        Connection conn = getConnection();
        Table table = conn.getTable(TableName.valueOf(tableName));
        Put put = new Put(Bytes.toBytes(stringRowkey));

        for (Field f : fs) {
            Column column = f.getAnnotation(Column.class);
            if (column != null) {
                String family = column.family();
                String colName = column.column();
                if ( colName == null || "".equals(colName) ) {
                    colName = f.getName();
                }
                f.setAccessible(true);
                String value = (String)f.get(obj);

                put.addColumn(Bytes.toBytes(family), Bytes.toBytes(colName), Bytes.toBytes(value));
            }
        }

        // 增加数据
        table.put(put);

        // 关闭表
        table.close();
    }