JdbcTemplateUtil公共类的使用-------java操作数据库（2）

1.在xml配置JdbcTemplateUtil所需的数据源

<!--2. 配置springDSN -->
<bean id="springDSN" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url"
            value="jdbc:mysql://localhost:3306/makefriends?useUnicode=true&characterEncoding=utf8" />
        <property name="username" value="root" />
        <property name="password" value="123" />
</bean>
 
 
<!-- 2. JdbcTemplate工具类实例 -->
    <bean id="jdbcTemplate"
        class="org.springframework.jdbc.core.JdbcTemplate" abstract="false"
        lazy-init="false" autowire="default" >
        <property name="dataSource">
            <ref bean="springDSN" />
        </property>
    </bean>

2.编写JdbcTemplateUtil公共类

package com.yun.utility;
 
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class JdbcTemplateUtil {
private static ApplicationContext  ctx = new ClassPathXmlApplicationContext("config/sprhib-data.xml");
    
    public static Object getBean(String beanName){
         return ctx.getBean(beanName);
    } 
}

3.编写测试类

<span style="font-size:18px;"><strong>package com.yun.test;

import java.util.List;
import java.util.Map;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

import com.yun.model.User;
import com.yun.utility.JdbcTemplateUtil;

public class TestJdbcTemplate {

  /**
   * @param args
   */
  @SuppressWarnings("unchecked")
  public static void main(String[] args) {
    // TODO Auto-generated method stub
//    DriverManagerDataSource ds=new DriverManagerDataSource();
//    ds.setDriverClassName("com.mysql.jdbc.Driver");
//    ds.setUrl("jdbc:mysql://localhost:3306/makefriends");
//    ds.setUsername("root");
//    ds.setPassword("123");
//    JdbcTemplate jt=new JdbcTemplate();
//    jt.setDataSource(ds);
    
    JdbcTemplate jt=(JdbcTemplate) JdbcTemplateUtil.getBean("jdbcTemplate");
    //JdbcTemplate jt=new JdbcTemplate();
    List<Map<String, Object>> list=jt.queryForList("select * from yunuser");
    System.out.println(list.size());
    for(int i=0;i<list.size();i++){
      Map map=list.get(i);
      System.out.println(map);
      System.out.println(map.get("user_name"));
    }
    
  }

}
</strong></span>