Android InputStream Read outputFile(InputStream is, String targetPath, String filename)

Description

out put a file from a InputStream to path and the out file is named as filename.

Parameter

Parameter	Description
is	InputStream contain the file data. point to a single file data
targetPath	path point to the out file place. The path must end with system path seprator
filename	fileName for the out file

Return

true if out put file successfully. false if failed. if inputstream is null or the targetPath is null or the filename is null return false. if the targetPath is empty string or the filename is empty string return false.

Declaration

public static boolean outputFile(InputStream is, String targetPath,
        String filename)

Method Source Code

//package com.java2s;

import java.io.BufferedOutputStream;
import java.io.File;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;

import java.util.List;

public class Main {
    private static final int BUFFER_SIZE = 8192;
    protected static byte buf[] = new byte[BUFFER_SIZE];
    private static List<Object> mTmpBuffer = new ArrayList<Object>();

    /**//from ww w.  java  2  s  . co  m
     * out put a file from a InputStream to path and the out file is named as
     * filename. if the path is exists and is not a dir will delete the path,
     * and recreate it. if the path is not exists, create the path.
     * 
     * @param is
     *            InputStream contain the file data. point to a single file data
     * @param targetPath
     *            path point to the out file place. The path must end with
     *            system path seprator
     * @param filename
     *            fileName for the out file
     * @return true if out put file successfully. false if failed. if
     *         inputstream is null or the targetPath is null or the filename is
     *         null return false. if the targetPath is empty string or the
     *         filename is empty string return false.
     */
    public static boolean outputFile(InputStream is, String targetPath,
            String filename) {
        if (is == null || targetPath.equals("") || targetPath == null
                || filename.equals("") || filename == null) {
            return false;
        }
        try {
            checkDirectory(targetPath);
            doOutputFile(is, targetPath + filename);
            is.close();
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    private static boolean checkDirectory(String dir) {
        File dirObj = new File(dir);
        if (dirObj.exists()) {
            if (!dirObj.isDirectory()) {
                dirObj.delete();
            }
            return false;
        }
        if (!dirObj.exists()) {
            dirObj.mkdirs();
        }
        return true;
    }

    private static void doOutputFile(InputStream is, String filename)
            throws IOException, FileNotFoundException {
        FileOutputStream os = new FileOutputStream(filename);
        BufferedOutputStream bos = new BufferedOutputStream(os, BUFFER_SIZE);
        int len;
        while ((len = is.read(buf, 0, BUFFER_SIZE)) > 0) {
            bos.write(buf, 0, len);
        }
        bos.flush();
        bos.close();
        os.close();
        mTmpBuffer.add(os);
        mTmpBuffer.add(bos);
    }
}