不同路径下加载资源

1.从类路径下加载

ClassLoader.getSystemResourceAsStream(path);

2.从指定URL加载

new URL(url).openStream();

3.从指定文件加载

new FileInputStream(path);

public static final String CLASSPATH_PREFIX = "classpath:";
public static final String URL_PREFIX = "url:";
public static final String FILE_PREFIX = "file:";

public static InputStream getInputStreamForPath(String resourcePath) throws IOException {

        InputStream is;
        if (resourcePath.startsWith(CLASSPATH_PREFIX)) {
            is = loadFromClassPath(stripPrefix(resourcePath));

        } else if (resourcePath.startsWith(URL_PREFIX)) {
            is = loadFromUrl(stripPrefix(resourcePath));

        } else if (resourcePath.startsWith(FILE_PREFIX)) {
            is = loadFromFile(stripPrefix(resourcePath));

        } else {
            is = loadFromFile(resourcePath);
        }

        if (is == null) {
            throw new IOException("Resource [" + resourcePath + "] could not be found.");
        }

        return is;
}