下面一个事例,是将传入的一个身份证号,转换成一个对象(提取身份证号的地址、出身日期、性别等)
实体类 Person 有三个字段如下:
String province; //地址
Date birthday; //出生日期
String sexual; //性别
Getter... Setter...
验证器实现 PersonFormatter:
实现 Formatter 接口,
public class PersonFormatter implements Formatter<Person> { @Override public Person parse(String text, Locale locale) throws ParseException {
//text参数是传进来的字符串,需要对字符串(身份证号)进行解析,并且保存到Person对象返回 return new Person(); } @Override public String print(Person object, Locale locale) { return null; } }
自定义 PersonFormatterAnnotation 类,实现 AnnotationFormatterFactory 接口:
public class PersonFormatterAnnotation implements AnnotationFormatterFactory<PersonFormId> { @Override public Set<Class<?>> getFieldTypes() { Set<Class<?>> types = new HashSet<>(); types.add(Person.class); return types; } @Override public Printer<?> getPrinter(PersonFormId annotation, Class<?> fieldType) { return null; } @Override public Parser<?> getParser(PersonFormId annotation, Class<?> fieldType) { return getFormatter(annotation); } private Formatter getFormatter(PersonFormId annotation) { return new PersonFormatter(); } }
spring xml文件代码:
<!-- 配置类型装换器 --> <bean name="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> <property name="formatters"> <set> <bean class="com.nf.lc.formatter.PersonFormatterAnnotation"></bean> </set> </property> </bean>
spring中注册:
<!-- 启用MVC的常用注解 --> <mvc:annotation-driven conversion-service="conversionService" />