封装JDBC通用工具类jdbc-utils

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1、jdbc.properties  数据库配置文件

 

jdbc.driverClassName=oracle.jdbc.driver.OracleDriver
jdbc.url=jdbc:oracle:thin:@localhost:1521:orcl
jdbc.userName=netrep_txv6
jdbc.password=netrep_txv6_epsoft

2、log4j.properties 文件

log4j.rootCategory=INFO,standard
log4j.appender.standard=org.apache.log4j.ConsoleAppender
log4j.appender.standard.layout=org.apache.log4j.PatternLayout
log4j.appender.standard.layout.ConversionPattern=%-5p\: %d{ISO8601}\: %C{1}[line\:%L}\: %m%n

 

 

3、DBConfig.java 读取配置信息    

 

package com.insigma.jdbc.util.dbUtil;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.Logger;

public class DBConfig {
	private static Logger logger=Logger.getLogger(DBConfig.class);
	private String driverClassName;
	private String userName;
	private String password;
	private String url;
	
	
	public DBConfig() {
		  //读取db.properties文件
		     	              
/*		    Properties props = new Properties();
			  代表java命令运行的目录
			  在java项目下，. java命令的运行目录从项目的根目录开始
			  在web项目下，  . java命令的而运行目录从tomcat/bin目录开始
			   所以不能使用点.
			 FileInputStream in = new FileInputStream("./src/db.properties");
			 使用类路径的读取方式
			  斜杠表示classpath的根目录
			  在java项目下，classpath的根目录从bin目录开始
			  在web项目下，classpath的根目录从WEB-INF/classes目录开始
			 InputStream in = DBConfig.class.getResourceAsStream("/db.properties");*/
			  
			InputStream inStream=DBConfig.class.getResourceAsStream("/jdbc.properties");
			Properties properties=new Properties();
			try {
				properties.load(inStream);
			} catch (IOException e) {
				logger.error("加载数据库配置文件时发生异常："+e.getMessage(),e);
			}
			this.driverClassName = properties.getProperty("jdbc.driverClassName");
			this.userName = properties.getProperty("jdbc.userName");
			this.password = properties.getProperty("jdbc.password");;
			this.url = properties.getProperty("jdbc.url");
	}
	
	
	
	public DBConfig(String driverClassName, String userName, String password,
			String url) {
		super();
		this.driverClassName = driverClassName;
		this.userName = userName;
		this.password = password;
		this.url = url;
	}



	public String getDriverClassName() {
		return driverClassName;
	}
	public void setDriverClassName(String driverClassName) {
		this.driverClassName = driverClassName;
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}

	
	
}

 

 

4、JDBCUtil.java 封装JDBC访问数据库等信息

package com.insigma.jdbc.util.dbUtil;

import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.apache.log4j.Logger;

public class JDBCUtil {
	private static Logger logger=Logger.getLogger(JDBCUtil.class);
	private static Connection conn=null;
	private static PreparedStatement pstmt=null;
	private static ResultSet rs=null;
	private static  String driverClassName="";
	private static  String url="";
	private static  String userName="";
	private static  String password="";
	
	private static void loadConfig(){
		DBConfig config=new DBConfig();
		driverClassName=config.getDriverClassName();
		url=config.getUrl();
		userName=config.getUserName();
		password=config.getPassword();
				
	}
	
	static{
		try {
			loadConfig();
			Class.forName(driverClassName);
		} catch (ClassNotFoundException e) {
			logger.error("数据库驱动类加载异常："+e.getMessage(),e);
		}
	}
	
	public static Connection getConn() throws SQLException{
		try{
			conn=DriverManager.getConnection(url,userName,password);
		}catch(RuntimeException re){
			logger.error("获取数据库连接异常："+re.getMessage(),re);
			throw re;
		}
		return conn;
	}
	
	public static PreparedStatement getStmt(String sql) throws SQLException{
		try{
			pstmt=conn.prepareStatement(sql);
		}catch(RuntimeException re){
			logger.error("获取数据库处理命令异常："+re.getMessage(),re);
			throw re;
		}
		return pstmt;
	}
	
	public static void setParams(List