Ⅵ.spring的點點滴滴--自定義類型轉換器

承接上文

自定義類型轉換器

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.net篇（環境爲vs2012+Spring.Core.dll v1.31）

public class CustomeConverter : TypeConverter{
        public override bool CanConvertFrom(
            ITypeDescriptorContext context,
            Type sourceType){
            return true;
        }
        public override object ConvertFrom(
            ITypeDescriptorContext context, 
            System.Globalization.CultureInfo culture, 
            object value){
            return new TypeCunstomer() { Name = value.ToString() };
        }    
    }
    public class TypeObject{
        public TypeCunstomer Name { get; set; }    
    }
    public class TypeCunstomer{
        public string Name { get; set; }
    }

<object 
       type="Spring.Objects.Factory.Config.CustomConverterConfigurer, Spring.Core">
    <property name="CustomConverters">
      <dictionary>
        <entry key="SpringBase.TypeCunstomer">
          <object type="SpringBase.CustomeConverter"/>
        </entry>
      </dictionary>
    </property>
  </object>
  <object id="typeconvert" type="SpringBase.TypeObject,SpringBase">
    <property name="Name" value="2"/>
  </object>

1. 繼承中的CanConvertFrom方法是用於判斷可否轉換,ConvertFrom轉換的具體方法

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java篇（環境爲Maven+Jdk1.7+IntelliJ IDEA 12.1.4）

package springdemo;
import java.beans.PropertyEditorSupport;
public class TypeObject {
    private TypeCunstomer name;
    public TypeCunstomer getName() {
        return name;
    }
    public void setName(TypeCunstomer name) {
        this.name = name;
    }
}
class TypeCunstomer {
    private String name;
    String getName() {
        return name;
    }
    void setName(String name) {
        this.name = name;
    }
}
class CustomeConverter extends PropertyEditorSupport {
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        TypeCunstomer val=new TypeCunstomer();
        val.setName(text+"Convent");
        this.setValue(val);
    }
}

<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
        <property name="customEditors">
            <map>
                <entry key="springdemo.TypeCunstomer">
                    <bean class="springdemo.CustomeConverter" />
                </entry>
            </map>
        </property>
    </bean>
    <bean id="typeObject" class="springdemo.TypeObject">
        <property name="name" value="1"/>
    </bean>

1. 重寫setAsText方法，其中setValue的參數爲object

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java和Csharp的共同點

1. 配置文件中的dictionary|map標籤設置的key爲要轉換的類型,值爲轉換的方法類
2. 都是繼承一個對象，而後重寫方法來自定義類型的轉換

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