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=" "> <bean> <constructor-arg value="yyyy-MM-dd" /> </bean> <bean> <property> <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=" "> <!-- 自定义日期编辑器 --> <bean> <constructor-arg> <bean> <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> <property> <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=" "> <!--方式3：创建一个类 重写PropertyEditorSupport的setAsText方法 --> <!-- 自定义日期编辑器 --> <bean> <property> <!--需要编辑的属性类型，是一个map --> <map> <entry key="java.util.Date"> <bean> <property 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()); } }