json-lib反射annotation自定义字段名的转换（bean2json_str）
by alex

目的，根据类的annotation，将一个对象转化为字段为annotation指定name的json字符串。

JSONBuilder builder = new JSONBuilder(response.getWriter());builder.array();for (Object stat : stats) {boolean flag = stat.getClass().isAnnotationPresent(Table.class);String name = stat.getClass().getSimpleName();if (flag) {Table table = (Table) stat.getClass().getAnnotation(Table.class);name = table.name();}builder.object();builder.key(name);builder.object();Method[] methods = stat.getClass().getMethods();for (Method method : methods) {if (!"id".equals(method.getName()) && method.getName().startsWith("get")) {boolean isAnno = method.isAnnotationPresent(Column.class);String columnName = method.getName();if (isAnno) {Column c = method.getAnnotation(Column.class);columnName = c.name();}Object result = method.invoke(stat);if (result instanceof Date) {result = new Long(((Date)result).getTime() / 1000);}if (result instanceof Double && Double.isNaN((Double)result)) {result = new Double(0d);}builder.key(columnName).value(result);}}builder.endObject();builder.endObject();}builder.endArray();response.getWriter().close();