java工具类之配置文件读取工具类

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;

/**
 * 专门用于读取配置文件,提供访问配置文件的方法。
 * 文件内容为键值对形式，格式：key=value
 * 
 * @author zql
 *
 */
public class ReadPropertiesUtil {

	private InputStream ins = null;
	
	private Properties pro = null;

	public ReadPropertiesUtil() {
	}

	/**
	 * @param pkg 所在包名
	 * @param fileName 文件名
	 */
	public ReadPropertiesUtil(String pkg, String fileName) {
		// 配置文件所在路经
		String name = "config/" + pkg + "/" + fileName + ".properties";
		ins = ReadPropertiesUtil.class.getClassLoader().getResourceAsStream(name);
		BufferedReader bf = new BufferedReader(new InputStreamReader(ins));
		pro = new Properties();
		try {
			pro.load(bf);
		} catch (IOException e) {
			System.out.println(name + "文件没有找到,请检查路径！");
			e.printStackTrace();
		}
	}

	/**
	 * 通过key查询相应的value
	 * 
	 * @param key
	 * @return
	 */
	public String getPropertys(String key) {
		return pro.getProperty(key);
	}

	/**
	 * 返回键值对大小
	 * 
	 * @return
	 */
	public int size() {
		return pro.size();
	}

	/**
	 * 返回所有键值对
	 * 
	 * @return
	 */
	public Map<String, String> getMap() {
		Map<String, String> map = new HashMap<String, String>();
		for (Map.Entry<Object, Object> m : pro.entrySet()) {
			map.put(m.getKey().toString(), m.getValue().toString());
		}
		return map;
	}

	/**
	 * 判断配置文件是否存在
	 * 
	 * @param fileName
	 * @return
	 */
	public boolean isExistProperties(String fileName) {
		String paths = System.getProperty("user.dir") + "\\src\\config\\" + fileName + ".properties";
		File file = new File(paths);
		return file.exists();
	}
	
	public static void main(String[] args) {
		ReadPropertiesUtil rpu = new ReadPropertiesUtil("config","server");
		System.out.println(rpu.getPropertys("C02"));
		System.out.println(rpu.isExistProperties("server"));
		System.out.println(rpu.size());
	}
}