Java Resource Load getResourceAsStream(String relativeName, Class clazz)

Description

Returns the input stream for the resource with the specified relative name.

License

MIT License

Parameter

Parameter	Description
relativeName	a resource name (relative, or absolute).
clazz	a class used to make the resource name absolute and load the resource.

Exception

Parameter	Description
IOException	if the resource was not found.

Return

the resource input stream.

Declaration

public static InputStream getResourceAsStream(String relativeName, Class<?> clazz) throws IOException 

Method Source Code

//package com.java2s;
/*/*from  w w w.j  ava 2  s  . c o  m*/
 * Copyright (c) 2015-2016 QuartzDesk.com.
 * Licensed under the MIT license (https://opensource.org/licenses/MIT).
 */

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    /**
     * Returns the input stream for the resource with the specified absolute name.
     * The resource is loaded through the current thread's context class loader.
     *
     * @param absoluteName a resource name.
     * @return the resource input stream.
     * @throws IOException if the resource was not found.
     */
    public static InputStream getResourceAsStream(String absoluteName) throws IOException {
        String resourceName = absoluteName.startsWith("/") ? absoluteName.substring(1) : absoluteName;
        InputStream ins = Thread.currentThread().getContextClassLoader().getResourceAsStream(resourceName);

        if (ins == null)
            throw new IOException("Cannot find resource: " + absoluteName);

        return new BufferedInputStream(ins);
    }

    /**
     * Returns the input stream for the resource with the specified relative name.
     * The name is treated as relative and the package name of the specified
     * class is prepended to that name to make the name absolute. The resource
     * is loaded through the current thread's context class loader.
     *
     * @param relativeName a resource name (relative, or absolute).
     * @param clazz a class used to make the resource name absolute and load the resource.
     * @return the resource input stream.
     * @throws IOException if the resource was not found.
     */
    public static InputStream getResourceAsStream(String relativeName, Class<?> clazz) throws IOException {
        String newName = getAbsoluteResourceName(relativeName, clazz);
        return getResourceAsStream(newName);
    }

    /**
     * Simply prepends the package name of the specified class to the
     * specified name and replaces all '.' with '/'.
     *
     * @param name a resource name.
     * @param clazz a class to be used to resolve the name if it
     * is a relative name.
     * @return the absolute resource name.
     */
    public static String getAbsoluteResourceName(String name, Class<?> clazz) {
        StringBuilder absName = new StringBuilder(clazz.getPackage().getName().replace('.', '/'));
        absName.append('/');
        absName.append(name);
        return absName.toString();
    }
}

Related

1. getResourceAsStream(String name, Class clzz)
2. getResourceAsStream(String path)
3. getResourceAsStream(String path, Class caller)
4. getResourceAsStream(String path, ClassLoader cl)
5. getResourceAsStream(String path, ClassLoader loader)
6. getResourceAsStream(String res)
7. getResourceAsStream(String resName, Object obj)
8. getResourceAsStream(String resource, ClassLoader classLoader)
9. getResourceAsStream(String resource, ClassLoader classLoader)