java 对properties 文件的写操作

/**向properties 中写入key=value*/ public static void writeProperties2(String filePath, String parameterName,String parameterValue) { Properties prop = new Properties(); InputStream fis = null; OutputStream fos =null; try { fis = new FileInputStream(filePath); prop.load(fis); fos= new FileOutputStream(filePath); prop.setProperty(parameterName, parameterValue); prop.store(fos, "Update '" + parameterName + "' value"); } catch (IOException e) { System.err.println("Visit " + filePath + " for updating "+ parameterName + " value error"); }finally{ if(fis!=null){ try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } if(fos!=null){ try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } System.out.println("成功"); } 

 调用：

writeProperties2("G://result.porperties","password1","soliu1"); 

还有一个问题没有解决，就是如果文件在本项目中，读进来的应该是一个流。有没有处理过的。谢谢...

对存放到**.properties 文件中的内容进行读取，当**.properties 内容有变更时，直接修改，不需要重新启动服务器

package com.rt.portal.web.guangxi.ICBC.clrcenter.util;

import java.io.File;
import java.io.FileInputStream;
import java.net.URL;
import java.util.Properties;


/**
 *<pre>
 * COMPANY 海科融通 
 * @author liucheng
 * MSN     soliucheng@hotmail.com
 * 2012-2-28 上午09:27:14
 * ALL_RIGHT: 2011-2015 
 * </pre>
 */
public class FtpUtil {
	private static FtpUtil m_instance;
	private static String PFILE;

	synchronized public static FtpUtil getInstance() {
		if (m_instance == null) {
			if (PFILE == null) {
				URL url =Thread.currentThread().getContextClassLoader().getResource("ftp.properties");
			}
			m_instance = new FtpUtil();
		}
		return m_instance;
	}

	private File m_file = null;
	private long m_lastModifiedTime = 0;
	private Properties m_props = null;

	private FtpUtil() {
		m_file = new File(PFILE);
		m_lastModifiedTime = m_file.lastModified();

		if (m_lastModifiedTime == 0) {
			System.err.println(PFILE + " file does not exist!");
		}

		m_props = new Properties();

		try {
			m_props.load(new FileInputStream(PFILE));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	final public String getConfigItem(String name, String defaultVal) {
		long newTime = m_file.lastModified();
		if (newTime == 0) {
			if (m_lastModifiedTime == 0) {
				System.err.println(PFILE + " file does not exist!");
			} else {
				System.err.println(PFILE + " file was deleted!!");
			}
			return defaultVal;
		} else if (newTime > m_lastModifiedTime) {
			m_props.clear();
			try {
				m_props.load(new FileInputStream(PFILE));
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		m_lastModifiedTime = newTime;

		String val = m_props.getProperty(name);
		if (val == null) {
			return defaultVal;
		} else {
			return val;
		}
	}
	public static void main(String args []){
		String userName = FtpUtil.getInstance().getConfigItem("FTPTRANSFERPART","192.168.30.36");
		System.out.println(userName);
	}
}

对固定不变的**.properties 对容进行读取，入到一个对象变量里

	public static String GXIP = null;
	public static String GXPORT = null;	

static {
		Properties props = new Properties();
		InputStream in = null;
		try {
			in = Thread.currentThread().getContextClassLoader().getResourceAsStream("define.properties");
			props.load(in);
			Enumeration<?> en = props.propertyNames();
			while (en.hasMoreElements()) {
				String key = (String) en.nextElement();
				if (key.equals("GXIP")) {
					GXIP = props.getProperty(key);
				} else if (key.equals("GXPORT")) {
					GXPORT = props.getProperty(key);
				}
			}
		}catch (Exception e) {
		}finally {
			if (in != null) {
				try {
					in.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

还有一种简单的方式来读取xx.properties 文件

public class ReadProperties {

	public static ResourceBundle resources = ResourceBundle.getBundle("config/"+File.separator+ "spy");

	public static String getString(String str) {
		return resources.getString(str);
	}

	public static void main(String[] args) {
		System.out.println(getString("module.log"));
	}
}