Java ClassPath readFileFromClasspath(String fileName)

Description

read File From Classpath

License

Apache License

Declaration

public static String readFileFromClasspath(String fileName) throws IOException 

Method Source Code

//package com.java2s;
/*//from ww  w  . j  a  va2 s. c om
 * Copyright (C) 2017 CenturyLink, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedReader;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import java.net.URISyntaxException;
import java.net.URL;

public class Main {
    public static String readFileFromClasspath(String fileName) throws IOException {
        URL url = Thread.currentThread().getContextClassLoader().getResource(fileName);
        if (url == null)
            throw new IOException("Unable to find file: " + fileName);

        return getFileContents(getFilePath(url));
    }

    /**
     * Method that returns the file contents
     * @param pFileName
     * @return FileContents
     */
    public static String getFileContents(String pFileName) throws IOException {
        String fileContents = null;
        InputStream is = new FileInputStream(pFileName);
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuffer xml = new StringBuffer();
        String aLine = null;
        while ((aLine = reader.readLine()) != null) {
            xml.append(aLine);
            xml.append("\n");

        }
        reader.close();
        fileContents = xml.toString();
        return fileContents;
    }

    public static String getFilePath(URL url) throws FileNotFoundException {
        File file = null;
        try {
            file = new File(url.toURI());
        } catch (URISyntaxException e) {
            file = new File(url.getPath());
        }

        if (!file.exists())
            throw new FileNotFoundException(url.getPath());

        return file.getAbsolutePath();
    }
}

Related

1. parseClassPath(String classpath)
2. parseJavaClassPath()
3. printClassPath()
4. printClassPath(boolean single)
5. printJVMClassPath()
6. readFromClassPath(String filePath)
7. readStringFromClasspath(String path, Class c)
8. toClassLoaderWithDefaultParent(Collection classPaths)
9. toClasspathString(ClassLoader cl)