java读写自定义property文件

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import java.io.*;import java.net.URI;import java.net.URL;import java.util.Enumeration;import java.util.Properties;public class PropertiesUtils {    private static Properties properties;    private URI uri;    /**     * 加载属性文件     *     * @param filePath 文件路径     * @return     */    public static Properties loadProps(String filePath) {        properties = new Properties();        String path = null;        try {            URL xmlpath = PropertiesUtils.class.getClassLoader().getResource(filePath);            if (xmlpath != null) {                path = xmlpath.getPath();//                InputStream in = new BufferedInputStream(new FileInputStream(path));                InputStream in = PropertiesUtils.class.getClassLoader().getResourceAsStream(filePath);                properties.load(in);            }        } catch (Exception e) {            e.printStackTrace();        }        return properties;    }    /**     * 读取配置文件     *     * @param     * @param key     * @return     */    public static String getString(Properties properties, String key) {        return properties.getProperty(key);    }    /**     * 更新配置文件     *     * @return     */    public static void updatePropertyLoginError(Properties properties, String filePath, String keyname, String keyvalue) {        try {            properties.setProperty(keyname, keyvalue);            String path = PropertiesUtils.class.getClassLoader().getResource(filePath).getPath();            FileOutputStream outputFile = new FileOutputStream(path);            properties.store(outputFile, "modify");            outputFile.flush();            outputFile.close();        } catch (Exception e) {            e.printStackTrace();        }    }    /**     *     * @param filePath     * @param key     * @return     */    public static String GetValueByKey(String filePath, String key) {        Properties pps = new Properties();        try {            InputStream in = new BufferedInputStream(new FileInputStream(filePath));            pps.load(in);            String value = pps.getProperty(key);            System.out.println(key + " = " + value);            return value;        } catch (IOException e) {            e.printStackTrace();            return null;        }    }    //读取Properties的全部信息    /**     *     * @throws IOException     */    public static void GetAllProperties() throws IOException {        Properties pps = new Properties();        String filePath = null;        URL xmlpath = PropertiesUtils.class.getClassLoader().getResource("raspberry.properties");        System.out.println(xmlpath);        if (xmlpath != null) {            filePath = xmlpath.getPath();        }        InputStream in = new BufferedInputStream(new FileInputStream(filePath));        pps.load(in);        Enumeration en = pps.propertyNames(); //得到配置文件的名字        while (en.hasMoreElements()) {            String strKey = (String) en.nextElement();            String strValue = pps.getProperty(strKey);            System.out.println(strKey + "=" + strValue);        }    }    /**     *     * @param filePath     * @param pKey     * @param pValue     * @return     * @throws IOException     */    public static boolean WriteProperties(String filePath, String pKey, String pValue) throws IOException {        Properties pps = new Properties();        String path = null;        URL xmlpath = PropertiesUtils.class.getClassLoader().getResource(filePath);        if(null!=xmlpath){            path = xmlpath.getPath();            InputStream in = new FileInputStream(path);            //从输入流中读取属性列表（键和元素对）            pps.load(in);            //调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。            //强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。            OutputStream out = new FileOutputStream(path);            pps.setProperty(pKey, pValue);            //以适合使用 load 方法加载到 Properties 表中的格式，            //将此 Properties 表中的属性列表（键和元素对）写入输出流            pps.store(out, "Update" + pKey + "name");            out.flush();            out.close();            return true;        }else{            return false;        }    }    /**     *     * @param properties     * @param filePath     * @param keyname     * @param keyvalue     */    public static void updateProperty(Properties properties,String filePath,String keyname,String keyvalue) {        try {            // 从输入流中读取属性列表（键和元素对）            properties.setProperty(keyname, keyvalue);            FileOutputStream outputFile = new FileOutputStream(filePath);            properties.store(outputFile, null);            outputFile.flush();            outputFile.close();        } catch (Exception e) {            e.printStackTrace();        }    }    /*public static void main(String[] args) throws IOException {        URL xmlpath = PropertiesUtils.class.getClassLoader().getResource("raspberry.properties");        System.out.println(xmlpath);        properties = loadProps(xmlpath.getPath());//        updateProperty(properties,"raspberry.properties","password","wwwwwwww");//        GetAllProperties();        WriteProperties("raspberry.properties","userName","microlink");    }*/}
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