Java FileInputStream Read readFile(String path, String root, OutputStream out)

Description

Dump the contents of the given path (relative to the root) to the output stream.

License

Open Source License

Declaration

public static void readFile(String path, String root, OutputStream out) throws IOException 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

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

import java.io.IOException;

import java.io.OutputStream;

public class Main {
    /**/*  ww  w  .  jav  a2 s .  c  o m*/
     * Dump the contents of the given path (relative to the root) to the output 
     * stream.  The path must not go above the root, either - if it does, it will
     * throw a FileNotFoundException
     *
     * Closes the OutputStream out on successful completion
     * but leaves it open when throwing IOE.
     */
    public static void readFile(String path, String root, OutputStream out) throws IOException {
        File rootDir = new File(root);
        while (path.startsWith("/") && (path.length() > 0))
            path = path.substring(1);
        if (path.length() <= 0)
            throw new FileNotFoundException("Not serving up the root dir");
        File target = new File(rootDir, path);
        if (!target.exists())
            throw new FileNotFoundException("Requested file does not exist: " + path);
        String targetStr = target.getCanonicalPath();
        String rootDirStr = rootDir.getCanonicalPath();
        if (!targetStr.startsWith(rootDirStr))
            throw new FileNotFoundException("Requested file is outside the root dir: " + path);

        byte buf[] = new byte[4 * 1024];
        FileInputStream in = null;
        try {
            in = new FileInputStream(target);
            int read = 0;
            while ((read = in.read(buf)) != -1)
                out.write(buf, 0, read);
            try {
                out.close();
            } catch (IOException ioe) {
            }
        } finally {
            if (in != null)
                try {
                    in.close();
                } catch (IOException ioe) {
                }
        }
    }
}

Related

1. readFile(String path)
2. readFile(String path)
3. readFile(String path, long offset)
4. readFile(String path, Properties store)
5. readFile(String path, String encoding)
6. readFile(String pPathToFile)
7. readFile(String resource)
8. readFile(String sFileName)
9. readFileAsBinary(File file)