Returns the input stream for the resource with the specified absolute name. - Java File Path IO

Java examples for File Path IO:File Stream

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Description

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

Demo Code

/*//  w  ww.  j  a v  a 2 s.c  o  m
 * Copyright (c) 2015-2016 QuartzDesk.com.
 * Licensed under the MIT license (https://opensource.org/licenses/MIT).
 */
//package com.java2s;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static void main(String[] argv) throws Exception {
        String absoluteName = "java2s.com";
        System.out.println(getResourceAsStream(absoluteName));
    }

    /**
     * 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();
    }
}

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