[JAVA]Base64 Encode => Base64 Decode 하여 파일생성하기(inputstream, byte[]를 통한 파일 전달에 사용가능)

* Base64 Encode => Base64 Decode 하여 파일생성하기 Apache commons codec 에서 제공하는 Base64 En Decoding 사용했습니다. ----------------------------------------------------------------------------- package com.test; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.commons.codec.binary.Base64; public class ImgTest { public ImgTest(){ try { File imgFile = new File("D:\\test.jpg"); // 이미지 파일을 byte[] 로 읽어온다. FileInputStream fis = new FileInputStream(imgFile); byte[] b = new byte[fis.available()]; fis.read(b); // 읽어온 이미지 파일의 바이너리 데이터를 base64로 인코딩한다. byte[] encoded = Base64.encodeBase64(b); // byte[] 형태의 base64 데이터를 String으로 변환. String base64Str = new String(encoded); System.out.println(base64Str); // 디코딩 작업. byte[] decoded = Base64.decodeBase64(encoded); File base64ToImgFile = new File("D:\\test2.jpg"); FileOutputStream fos = new FileOutputStream(base64ToImgFile); fos.write(decoded); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally{ } } public static void main(String[] args) { new ImgTest(); } }
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https://stackoverflow.com/questions/17506428/convert-base64-string-to-image-in-java

Java] InputStream 을 String으로 변환하기

 InputStream 을  String으로 변환하는 방법


 춮처 : http://www.kodejava.org/examples/266.html

package org.kodejava.example.io;

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

public class StreamToString {

    public static void main(String[] args) throws Exception {
        StreamToString sts = new StreamToString();

        /*
         * Get input stream of our data file. This file can be in the root of
         * you application folder or inside a jar file if the program is packed
         * as a jar.
         */
        InputStream is = sts.getClass().getResourceAsStream("/data.txt");

        /*
         * Call the method to convert the stream to string
         */
        System.out.println(sts.convertStreamToString(is));
    }

    public String convertStreamToString(InputStream is) throws IOException {
        /*
         * To convert the InputStream to String we use the BufferedReader.readLine()
         * method. We iterate until the BufferedReader return null which means
         * there's no more data to read. Each line will appended to a StringBuilder
         * and returned as String.
         */
        if (is != null) {
            StringBuilder sb = new StringBuilder();
            String line;

            try {
                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                while ((line = reader.readLine()) != null) {
                    sb.append(line).append("\n");
                }
            } finally {
                is.close();
            }
            return sb.toString();
        } else {      
            return "";
        }
    }
}