Spring MVC automatically injects enumeration data into objects

1. Implement the conversion factory and define the conversion implementation, as follows:

 

 

package com.mafwo;
import org.springframework.core.convert.converter.Converter;import org.springframework.core.convert.converter.ConverterFactory;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class OrdinalToEnumConverterFactory implements ConverterFactory<String, Enum<?>> {@Overridepublic <T extends Enum<?>> Converter<String, T> getConverter(Class<T> targetType) {










return new OrdinalToEnum<T>(targetType);
}

private class OrdinalToEnum<T extends Enum<?>> implements Converter<String, T> {

private final Class<T> enumType;
         public OrdinalToEnum(Class<T> enumType) {this.enumType = enumType;}@Overridepublic T convert(String source) {// 转换成数字int ordinal = Integer.valueOf        







(source);
             if(ordinal == Integer.MIN_VALUE) {
return null;
}
             Object temp = null;
             try {
                 Method getCode = enumType.getMethod("getCode");

Object[] objects = enumType.getEnumConstants();
                 for(Object ob: objects){
                    Integer temps = (Integer) getCode.invoke(ob);
                     if(temps == ordinal)
                     {
                         temp = ob;
                         break;
}

                 }

             } catch (NoSuchMethodException e) {
                 e.printStackTrace();
} catch (InvocationTargetException e) {
                 e.printStackTrace();
} catch (IllegalAccessException e) {
                 e.printStackTrace();
}
return (T) temp;
}

     }
 }

Second, configure in the spring configuration file:

<!-- Note that it needs to be declared at the annotation-driven place after configuring conversion incentives --> 
< mvc :annotation-driven conversion-service = "conversionService" ></ mvc :annotation-driven> 
<bean id = "conversionService" class = "org.springframework.context.support.ConversionServiceFactoryBean" >     <property name ="converters" >         <set> <!-- Automatically resolve the serial number of the enumeration type to the enumeration type --> <bean class ="com. mafwo.OrdinalToEnumConverterFactory" />         </set>     </property> </bean>

After that, you can use annotations to automatically inject enumeration type data.