jdbc-JDBC使用反射读取properties文件出错

<code>@Test public   void getConnection() throws Exception { /* * 读取配置文件来获取数据库连接 */    Properties properties = new Properties(); String driverClass = null; String jdbcUrl = null; String user = null; String password = null; InputStream in =    this.getClass().getClassLoader().getResourceAsStream("C:/Java/WprkSpace/JDBC/jdbc.properties"); properties.load(in); driverClass = properties.getProperty("driver"); jdbcUrl = properties.getProperty("jdbcUrl"); user = properties.getProperty("user"); password = properties.getProperty("password"); Driver driver =  (Driver) Class.forName(driverClass).newInstance(); properties.put("user", user); properties.put("password", password); Connection connerction = driver.connect(jdbcUrl, properties); System.out.println( connerction); in.close(); }</code>

回复内容：

读取properties文件可以有多种方式，用IO或者用ClassLoader，绝对路径的用IO，相对路径可以用IO也可以用ClassLoader，因为相对路径是相对于Classpath的。一般来说用到ClassLoader的话都是用的相对路径了。

http://bbs.csdn.net/topics/391984276

使用PropertyPlaceholderConfigurer读取.properties文件(1)
----------------------biu~biu~biu~~~在下问答机器人小D，这是我依靠自己的聪明才智给出的答案，如果不正确，你来咬我啊！

路径改成相对于SRC的路径吧。

classloader去加载的是classpath下的资源，加*会加载jar中的，否则会扫描普通文件，希望对你理解有帮助

<code>        一般没有绝对路径这种用法吧，非要用试一试
        Properties props = new Properties(); 
        File file=new File("H:\\DESKTOP\\email.properties");
        props.load(this.getClass().getClassLoader().getResourceAsStream(file.getName()));
</code>

1，把jdbc.properties 放到src下 ，
2.

<code> public class CMConstant {
public static String getConfigureParameterFromJDBC(String paramString) {
        String str = CMConstant.getRootPath() + File.separator + "WEB-INF"
                + File.separator + "classes/config.properties";
        Properties localProperties = new Properties();
        try {
            FileInputStream localFileInputStream = new FileInputStream(str);
            localProperties.load(localFileInputStream);
            localFileInputStream.close();
        } catch (FileNotFoundException localFileNotFoundException) {
            logger.error("读取属性文件--->失败！- 原因：文件路径错误或者文件不存在");
            localFileNotFoundException.printStackTrace();
            return null;
        } catch (IOException localIOException) {
            logger.error("装载文件--->失败!");
            localIOException.printStackTrace();
        }
        return localProperties.getProperty(paramString);
    }
    public static String getRootPath() {
        String result = null;
        try {
            result = CMConstant.class.getResource("CMConstant.class").toURI()
                    .getPath().toString();
        } catch (URISyntaxException e1) {
            e1.printStackTrace();
        }
        int index = result.indexOf("WEB-INF");
        if (index == -1) {
            index = result.indexOf("bin");
        }
        result = result.substring(1, index);
        if (result.endsWith("/"))
            result = result.substring(0, result.length() - 1);// 不包含最后的"/"
        return result;
    }
/**
     * 查找config/jdbc.properties里值
     * @Description: @param key
     * @Description: @return
     * @Last Modified: , Date Modified:
     */
    public static String getJDBCValue(String key) {
        String filePath = getRootPath() + File.separator + "WEB-INF\\classes"
                + File.separator + "config.properties";
        Properties propertie = new Properties();
        try {
            FileInputStream inputFile = new FileInputStream(filePath);
            propertie.load(inputFile);
            inputFile.close();
        } catch (FileNotFoundException ex) {
            ex.printStackTrace();
            return null;
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return propertie.getProperty(key);
    }
}
</code>