Spring注入Date类型的三种方法总结-巨人网络通讯

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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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