#spring Bean的获取与注入 ##一、spring Bean的注入 准备：
Bean Students类 public class Students { private int sid; private String username; private String gender; private Date birthday; public Students(int sid, String username, String gender, Date birthday) { this.sid = sid; this.username = username; this.gender = gender; this.birthday = birthday; } public Students() { } public int getSid() { return sid; } public void setSid(int sid) { this.sid = sid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Override public String toString() { return "Students{" + "sid=" + sid + ", username='" + username + '\'' + ", gender='" + gender + '\'' + ", birthday=" + birthday + '}'; } } convert包下自定义字符串转日期MyDateConvert类 public class MyDateConvert extends PropertyEditorSupport { /** * 字符串格式 * yyyy-MM-dd yyyy/MM/dd * 或是其他 应由外部传入 */ private String format; public MyDateConvert(String format) { this.format = format; } public String getFormat() { return format; } public void setFormat(String format) { this.format = format; } @Override public void setAsText(String text) throws IllegalArgumentException { SimpleDateFormat sdf = new SimpleDateFormat(this.format); try { this.setValue(sdf.parse(text)); } catch (ParseException e) { e.printStackTrace(); } } } convert包下自定义了一个注册器MyCustomDateEditorRegistrar类 public class MyCustomDateEditorRegistrar implements PropertyEditorRegistrar { private String format; public String getFormat() { return format; } public void setFormat(String format) { this.format = format; } @Override public void registerCustomEditors(PropertyEditorRegistry registry) { registry.registerCustomEditor(java.util.Date.class, new MyDateConvert(format)); } } applicationContext.xml中配置String转Date的bean <!-- 使 Spring转换为java.util.Date--> <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer"> <property name="propertyEditorRegistrars"> <list> <bean class="edu.xufe.convert.MyCustomDateEditorRegistrar"> <property name="format" value="yyyy-MM-dd"></property> </bean> </list> </property> </bean> 开启包扫描 扫描根包 edu <context:annotation-config/> <context:component-scan base-package="edu"/> 属性注入 <bean id="student" class="edu.xufe.entity.Students"> <property name="sid" value="1605990418"></property> <property name="username" value="李四"></property> <property name="gender" value="男"></property> <property name="birthday"> <bean factory-bean="dateFormat" factory-method="parse"> <constructor-arg value="1996-11-28"/> </bean> </property> </bean> 构造方法注入 <bean id="zhangsan1" class="edu.xufe.entity.Students"> <constructor-arg name="sid" value="1605990418"></constructor-arg> <constructor-arg name="username" value="张三1"></constructor-arg> <constructor-arg name="gender" value="女"></constructor-arg> <constructor-arg name="birthday" value="1996-11-28"></constructor-arg> </bean> 注解注入1.bean加注解@Compent(“bean name”) 2.属性加注解@Value(“值”)
@Component("zhangliu") public class Students { @Value("1605990418") private int sid; @Value("赵六") private String username; @Value("女") private String gender; @Value("1996-11-20") private Date birthday; public Students(int sid, String username, String gender, Date birthday) { this.sid = sid; this.username = username; this.gender = gender; this.birthday = birthday; } public Students() { } public int getSid() { return sid; } public void setSid(int sid) { this.sid = sid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Override public String toString() { return "Students{" + "sid=" + sid + ", username='" + username + '\'' + ", gender='" + gender + '\'' + ", birthday=" + birthday + '}'; } }##二、spring getBean的方式
getBean(“id | name”);根据id或者name去查找bean 缺点需要强制类型转换
getBean(Class);根据类型去查找bean 缺点bean是必须唯一
getBean(“id | name”,getBean(“id | name”));在指定类型的同时按照id或name去查找bean
getBean(“id | name”,Object[]);工厂方法 Object[]传入参数
