mybatis3-SqlSessionFactory保证唯一

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初始化工具类MyBatisUtil

要保证SqlSessionFaction这个对象全局唯一

MyBatisUtil.java

package com.torey.mybatis.utils;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.IOException;
import java.io.Reader;/*** @ClassName：MyBatisUtils* @Description：创建全局唯一的SqlSessionFaction对象* @author: Torey*/
public class MyBatisUtils {//static是静态的，是属于这个类，而不是属于对象的private static SqlSessionFactory sqlSessionFactory=null;static {//static块用于初始化静态对象try {Reader reader = Resources.getResourceAsReader("mybatis-config.xml");sqlSessionFactory= new SqlSessionFactoryBuilder().build(reader);} catch (IOException e) {e.printStackTrace();//初始化错误，通过抛出ExceptionInInitializerError通知调用者throw new ExceptionInInitializerError(e);}}public static SqlSession openSession(){return sqlSessionFactory.openSession();}public static void closeSession(SqlSession sqlSession){if (null!=sqlSession) {sqlSession.close();}}
}

测试用例

package com.torey.mybatis;import com.torey.mybatis.utils.MyBatisUtils;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;import java.io.File;
import java.io.IOException;
import java.io.Reader;/*** @ClassName：MybatisTestor* @Description：* @author: Torey*/
public class MybatisTestor {@Testpublic void testMyBatisUtil() throws Exception {SqlSession sqlSession = null;try {sqlSession = MyBatisUtils.openSession();Configuration configuration = sqlSession.getConfiguration();System.out.println(configuration);} catch (Exception ex) {throw ex;} finally {MyBatisUtils.closeSession(sqlSession);}}}