不同路径下加载资源

wangyong1991

于 2017-06-10 12:05:56 发布

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CC 4.0 BY-SA版权

文章标签： java

本文链接：https://blog.youkuaiyun.com/wangyong1991/article/details/72983360

本文介绍了四种常见的资源加载方法：从类路径、指定URL、指定文件及默认情况下的文件系统加载。每种方法都提供了具体的实现代码片段，如使用 ClassLoader.getSystemResourceAsStream 对于类路径加载的支持等。

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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;
}