spring中基於java的容器註解(12)

2016/1/18 9:01:56

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1.資源文件的讀取方式

<context:annotation-config></context:annotation-config>
<context:property-placeholder location="classpath:/Spring/src/jdbc.properties"/>
<bean class="com.Appconfig"></bean>
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="url" value="${jdbc.url}"></property>
    <property name="username" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
</bean>

或者在類中寫註釋：

package com.zjx.properties;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportResource;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

@Configuration
@ImportResource("classpath:/Spring/src/jdbc.properties")
public class AppConfig {
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String passWord;

    public DataSource dataSource(){
        return new DriverManagerDataSource(url, userName, passWord);
    }
}

2.@Bean and @Scope

• 默認@Bean是單例的