Spring注入Date类型的三种方法总结

Spring注入Date类型的三种方法总结

测试Bean：

public class DateBean {
  private Date birthday; 

  public Date getBirthday() {
    return birthday;
  } 

  public void setBirthday(Date birthday) {
    this.birthday = birthday;
  }
}

方式1：利用SimpleDateFormat的构造方法注入

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd"> 

  <bean id="dateFormat" class="java.text.SimpleDateFormat">
  <constructor-arg value="yyyy-MM-dd" />
  </bean> 

  <bean id="datebean" class="com.springDemo1.Date类型注入.DateBean">
    <property name="birthday">
      <bean factory-bean="dateFormat" factory-method="parse">
        <constructor-arg value="2015-12-31" />
      </bean>
    </property>
  </bean>
</beans>

方式2：纯配置，先自定义CustomDateEditor，再转换类型

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd"> 

  <!-- 自定义日期编辑器 -->
  <bean id="dateEditor"
    class="org.springframework.beans.propertyeditors.CustomDateEditor">
    <constructor-arg>
      <bean class="java.text.SimpleDateFormat">
        <constructor-arg value="yyyy-MM-dd"></constructor-arg>
      </bean>
    </constructor-arg>
    <constructor-arg value="true" />
  </bean>
  <!-- 使 Spring转换为java.util.Date -->
  <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
    <property name="customEditors">
      <map>
        <entry key="java.util.Date">
          <ref bean="dateEditor" />
        </entry>
      </map>
    </property>
  </bean>
</beans>

方式3：先用一个类重写PropertyEditorSupport的setAsText方法，再在配置文件中，配置转换类型就可以了，跟上面方法类似

public class MyDatePropertyEditor extends PropertyEditorSupport {
  private String format; 

  public String getFormat() {
    return format;
  } 

  public void setFormat(String format) {
    this.format = format;
  } 

  // text为需要转换的值，当为bean注入的类型与编辑器转换的类型匹配时就会交给setAsText方法处理
  public void setAsText(String text) throws IllegalArgumentException {
    SimpleDateFormat sdf = new SimpleDateFormat(format);
    try {
      this.setValue(sdf.parse(text));
    } catch (ParseException e) {
      e.printStackTrace();
    }
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd"> 

  <!--方式3：创建一个类 重写PropertyEditorSupport的setAsText方法 -->
  <!-- 自定义日期编辑器 -->
  <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
    <property name="customEditors"> <!--需要编辑的属性类型，是一个map -->
      <map>
        <entry key="java.util.Date">
          <bean class="com.springDemo1.Date类型注入.MyDatePropertyEditor">
            <property name="format" value="yyyy-MM-dd" /> <!--注入需要转换的格式 -->
          </bean>
        </entry>
      </map>
    </property>
  </bean>
</beans>

测试：

public class DateTest {
  @Test
  public void testName() throws Exception { 

    ApplicationContext context = new ClassPathXmlApplicationContext(
        "applicationContext.xml"); 

    DateBean bean = (DateBean) context.getBean("datebean");
    System.out.println(bean.getBirthday());
  }
}

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