properties文件读取与写入

将peoperties文件的读取和写入封装成了一个工具类：

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

public class PropertyUtil {

	/**
	 * 读取properties文件
	 * @param fileName
	 * @return
	 */
	public static Map<String, String> getProperties(String fileName) {
		Map<String, String> propertyMap = new HashMap<String, String>();
		Properties properties = new Properties();
		InputStream in = null;
		try {
			in = new BufferedInputStream(new FileInputStream(fileName));
			properties.load(in);
			Iterator<String> itr = properties.stringPropertyNames().iterator();
			while (itr.hasNext()) {
				String key = itr.next();
				String value = properties.getProperty(key);
				propertyMap.put(key, value);
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (null != in) {
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return propertyMap;
	}

	/**
	 * 将properties保存成文件
	 * @param properties
	 * @param fileName
	 * @param comments
	 */
	public static void saveProperties(Map<String, String> properties,
			String fileName, String comments) {
		Properties property = new Properties();
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(fileName);
			Set<Map.Entry<String, String>> entrySet = properties.entrySet();
			for (Map.Entry<String, String> entry : entrySet) {
				String key = entry.getKey();
				String value = entry.getValue();
				property.setProperty(key, value);
			}
			property.store(out, comments);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (null != out) {
				try {
					out.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

}