jdbc 操作数据库 出现空指针

[nice_fly]

错误显示

Exception in thread "main" java.lang.NullPointerException
	at java.util.Properties$LineReader.readLine(Properties.java:418)
	at java.util.Properties.load0(Properties.java:337)
	at java.util.Properties.load(Properties.java:325)
	at cn.pb.news.util.ConfigManager.<init>(ConfigManager.java:19)
	at cn.pb.news.util.ConfigManager.getInstance(ConfigManager.java:30)
	at edu.njcc.rj1514.dao.NewsDao.add(NewsDao.java:72)
	at edu.njcc.rj1514.dao.NewsDao.main(NewsDao.java:118)

怎么解决呀 下面的 是我的代码

package edu.njcc.rj1514.dao;

import java.sql.Connection;
import java.util.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;

// import com.mysql.jdbc.PreparedStatement;

import cn.pb.news.util.ConfigManager;

public class NewsDao {

	//查询新闻明细表
	public void getNewsList(){

		Connection connection = null;
		Statement st = null;
		ResultSet rs =null;
		//从工具类里面得到我配置文件里的值
		String driver = ConfigManager.getInstance().getString("jdbc.driver.class");
		String url = ConfigManager.getInstance().getString("jdbc.connection.url");
		String username = ConfigManager.getInstance().getString("jdbc.connection.username");
		String password = ConfigManager.getInstance().getString("jdbc.connection.password");
		try {
			// 1、加载驱动
			Class.forName(driver);
			//2、获取数据库连接
			connection = DriverManager.getConnection(url, username, password);
			//3、获取Statement对象
			String sql = "SELECT * FROM `news`.`news_detail`";
			st = connection.createStatement();
			rs = st.executeQuery(sql);
			//4、处理sql执行结果
			while (rs.next()) {
				int id = rs.getInt("id");
				int cate = rs.getInt("categoryId");
				String title = rs.getString("title");
				String summary = rs.getString("summary");
				String content = rs.getString("content");
				System.out.println("id:" + id + "\t" +"categoryId:" + cate +"\t" +"title:" +title +"\t"+"summary" +summary );
			}
		} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		 catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		//5、关闭资源
		try {
			rs.close();
			st.close();
			connection.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		}
	
	//增加新闻信息
	public void add(int id,int categoryId,String title,String summary,String author,Date createDate){
		Connection connection = null;
//		Statement st = null;
		PreparedStatement pst = null;
		//从工具类里面得到我配置文件里的值
		String driver = ConfigManager.getInstance().getString("jdbc.driver_class");
		String url = ConfigManager.getInstance().getString("jdbc.connection.url");
		String username = ConfigManager.getInstance().getString("jdbc.connection.username");
		String password = ConfigManager.getInstance().getString("jdbc.connection.password");

		
		try {
			//1加载驱动
			Class.forName(driver);
			//2获取数据库连接
			connection = DriverManager.getConnection(url, username, password);
			//3获取statement对象，执行sql
//			String sql = "insert into news_detail(id,categoryId,title,summary,author,createdate) values('"+id+"','"+categoryId+"','"+title+"','"+summary+"','"+new Timestamp(createDate.getTime())+"')";
//			st = connection.createStatement();

			String sql = "insert into news_detail(id,categoryId,title,summary,createdate) values(?,?,?,?,?)";
			pst = connection.prepareStatement(sql);
			pst.setInt(1, id);
			pst.setInt(2, categoryId);
			pst.setString(3, title);
			pst.setString(4, summary);
			pst.setTimestamp(5,new Timestamp(createDate.getTime()) );
			
			//处理执行结果
//			int i = st.executeUpdate(sql);
			int i = pst.executeUpdate();
			if (i>0) {
				System.out.println("插入成功");
			}
			
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				pst.close();
				connection.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
public static void main(String[] args){
	NewsDao newsDao = new NewsDao();
	newsDao.add(16, 11, "增加测试", "摘要", "admin", new Date());
	
	newsDao.getNewsList();
}
}

[nice_fly]

这就是ConfigManager怎么改

package cn.pb.news.util;

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

//读取配置文件的工具类-单例模式
public class ConfigManager {
	//读取配置文件properties.load(inputstream)
	
	private static ConfigManager configManager;
	private static Properties properties;
	
	private ConfigManager(){
		String configFile = "databse.properties";
		 properties = new Properties();
		 InputStream is = ConfigManager.class.getResourceAsStream(configFile);
		 try {
			properties.load(is);
			is.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	//提供一个入口
	public static ConfigManager getInstance(){
		if (configManager == null) {
			configManager = new ConfigManager();
		}
		
		return configManager;
	}
	//取值
	
	public String getString(String key){
		return properties.getProperty(key);
		
	}
	
	
	
}

[jio可]

看下配置信息的文件流读取到了没有

[jio可]

configManager 19行初始化报错了