Spring注入Date類型的三種方法總結

測試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的構造方法注入

<?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"> 
  <constructor-arg value="yyyy-MM-dd" /> 
  </bean> 
   
  <bean id="datebean"> 
    <property name="birthday"> 
      <bean factory-bean="dateFormat" factory-method="parse"> 
<constructor-arg value="2015-12-31" /> 
      </bean> 
    </property> 
  </bean> 
</beans> 

方式2：純配置，先自定義CustomDateEditor，再轉換類型

<?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"> 
 
   
  <!-- 自定義日期編輯器 --> 
  <bean id="dateEditor" 
   > 
    <constructor-arg> 
      <bean> 
<constructor-arg value="yyyy-MM-dd"></constructor-arg> 
      </bean> 
    </constructor-arg> 
    <constructor-arg value="true" /> 
  </bean> 
  <!-- 使 Spring轉換為java.util.Date --> 
  <bean> 
    <property name="customEditors"> 
      <map> 
<entry key="java.util.Date"> 
  <ref bean="dateEditor" /> 
</entry> 
      </map> 
    </property> 
  </bean> 
</beans> 

方式3：先用一個類重寫PropertyEditorSupport的setAsText方法，再在配置文件中，配置轉換類型就可以了，跟上面方法類似

public class MyDatePropertyEditor extends PropertyEditorSupport { 
  private String format; 
 
  public String getFormat() { 
    return format; 
  } 
 
  public void setFormat(String format) { 
    this.format = format; 
  } 
 
  // text為需要轉換的值，當為bean注入的類型與編輯器轉換的類型匹配時就會交給setAsText方法處理 
  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：創建一個類 重寫PropertyEditorSupport的setAsText方法 --> 
  <!-- 自定義日期編輯器 --> 
  <bean> 
    <property name="customEditors"> <!--需要編輯的屬性類型，是一個map --> 
      <map> 
<entry key="java.util.Date"> 
  <bean> 
    <property name="format" value="yyyy-MM-dd" /> <!--注入需要轉換的格式 --> 
  </bean> 
</entry> 
      </map> 
    </property> 
  </bean> 
</beans> 

測試：

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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