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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