1、常见的属性的注入:int,string,list,set,map
2、什么是属性编辑器及作用?
(1)将spring配置文件中的字符串转换为相应的java对象
(2)spring内置了一些属性编辑器,也可以自定义属性编辑器
3、如果自定义属性编辑器
(1)继承propertyEditorSupport
(2)重写setAsText 方法
(3)使用 setValue 完成属性对象设置
下面通过实例来说明类属性自定义动态加载
工程截图:
工程说明:
1、Education.java 自定义属性(自定义类属性)
2、EducationPropertyEditor.java自定义属性编辑器
3、PropertyDateEditor.java 自定义日期属性编辑器
4、testPropertyEditot 单元测试类
测试结果截图:
代码:
beans.xm文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
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-2.5.xsd">
<bean id="PropertyEditorConfigurer1"
class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<!-- 引用类的属性类型,本例子中对应 com.test.Person 类的 education 属性 东北大亨对应读取的学校属性 -->
<entry key="com.test.Education">
<!--对应Address的编辑器 -->
<bean class="com.test.EducationPropertyEditor" />
</entry>
</map>
</property>
</bean>
<bean id="PropertyEditorConfigurer2"
class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<!-- 引用类的属性类型,本例子中对应 com.test.Person 类的 dataValue属性 -->
<entry key="java.util.Date">
<!--对应dataValue 属性的编辑器 -->
<bean class="com.test.PropertyDateEditor" >
<property name="dataPattern" value="yyyy/MM/dd"/>
</bean>
</entry>
</map>
</property>
</bean>
<bean id="person" class="com.test.Person">
<property name="id" value="1003" />
<property name="name" value="东北大亨" />
<property name="education" value="中国,北京海淀区清华大学" />
<property name="dataValue" value="2018/12/30" />
</bean>
</beans>
测试类 testPropertyEditot:
package com.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import junit.framework.TestCase;
public class testPropertyEditot extends TestCase {
public void testPrintProperty() {
System.out.println("测试springPropertyUtil start");
// 可以同时配置多个xml配置文件,如果多个配置具有一定规则情况下可以采用匹配方式进行读取
// 例如有两个xml 文件。既:beans-1.xml,beans-2.xml,beans-3.xml
// 采用匹配方式进行读取
// ApplicationContext ctx = new
// ClassPathXmlApplicationContext("beans-*.xml");
// 废弃方法不建议使用
// BeanFactory factory=new XmlBeanFactory(new
// ClassPathResource("beans.xml"));
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
Person person = (Person) ctx.getBean("person");
System.out.println("学生ID:" + person.getId());
System.out.println("名称:" + person.getName());
System.out.println("毕业时间:" + person.getDataValue());
System.out.println("学生就读国别:" + person.getEducation().getCountry());
System.out.println("学生就读地址:" + person.getEducation().getDirectory());
assertEquals(person.getId(),1003);
assertEquals(person.getName(),"东北大亨");
System.out.println("测试springPropertyUtil end");
}
}
日期编辑器 PropertyDateEditor :
package com.test;
import java.beans.PropertyEditorSupport;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
*
* @author 东北大亨
*
*/
public class PropertyDateEditor extends PropertyEditorSupport {
private String dataPattern;
/**
* Parse the value from the given text, using the SimpleDateFormat
*/
@Override
public void setAsText(String text) {
System.out.println("------UtilDatePropertyEditor.setAsText()------" + text);
try {
//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat sdf = new SimpleDateFormat(dataPattern);
Date date = new Date();
date = sdf.parse(text);
this.setValue(date);
} catch (Exception e) {
e.printStackTrace();
throw new IllegalArgumentException(text);
}
}
// 只要有set方法就可以注入进来
public void setDataPattern(String pattern) {
this.dataPattern = pattern;
}
}
人员 Person pojo类:
package com.test;
import java.util.Date;
import org.apache.commons.lang.builder.ToStringBuilder;
/**
*
* @author 东北大亨
*
*/
public class Person {
private int id;
private String name;
private Education education;
private Date dataValue;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Date getDataValue() {
return dataValue;
}
public void setDataValue(Date dataValue) {
this.dataValue = dataValue;
}
public Education getEducation() {
return education;
}
public void setEducation(Education education) {
this.education = education;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String toString() {
return ToStringBuilder.reflectionToString(this);
}
}
实体类属性编辑器:
package com.test;
import java.beans.PropertyEditorSupport;
import org.springframework.util.StringUtils;
/**
* 实体类编辑器
* @author 东北大亨
*
*/
public class EducationPropertyEditor extends PropertyEditorSupport {
@Override
public void setAsText(String text) {
if (text == null || !StringUtils.hasText(text)) {
throw new IllegalArgumentException("就读住址不能为空!");
} else {
String[] StrAddressArr = StringUtils.tokenizeToStringArray(text, ",");
Education add = new Education();
add.setCountry(StrAddressArr[0]);
add.setDirectory(StrAddressArr[1]);
setValue(add);
}
}
public String getAsText() {
Education add = (Education) getValue();
return "" + add;
}
}
学校实体类:
package com.test;
import org.apache.commons.lang.builder.ToStringBuilder;
/**
* 读取学校实体类
* @author 东北大亨
*
*/
public class Education {
private String country;
private String directory;
public String getDirectory() {
return directory;
}
public void setDirectory(String directory) {
this.directory = directory;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
原文地址:https://www.cnblogs.com/northeastTycoon/p/spring.html