android / java 字节流写入文件

将服务器传来的字节流写入文件

filePath 为写入路径

fileName 为文件名(包括后缀)

注: android 64 包为 android.util.Base64

java也差不多

private void initData(String data,String name) {

            String filePath = "/sdcard/IntegrateMonitorFile/";
            String fileName = name;

            Log.d("wocao",  Realfile);
            byte[] bytes = Base64.decode(data, Base64.DEFAULT);  
            writeTxtToFile(bytes, filePath, fileName);
    }

    // 将字符串写入到文本文件中
    public void writeTxtToFile(byte[] bytes, String filePath, String fileName) {
        //生成文件夹之后，再生成文件，不然会出错
        makeFilePath(filePath, fileName);

        String strFilePath = filePath+fileName;
        try {
            /*  File file = new File(strFilePath);
            if (!file.exists()) {
                Log.d("wocao", "Create the file:" + strFilePath);
                file.getParentFile().mkdirs();
                file.createNewFile();
            }else{
                file.delete();
                file.getParentFile().mkdirs();
                file.createNewFile();
            }*/
           /* RandomAccessFile raf = new RandomAccessFile(file, "rwd");
            raf.seek(0);
            raf.write(bytes);
            raf.close();*/

            FileOutputStream out = new FileOutputStream(strFilePath);
            out.write(bytes);
            out.close();


        } catch (Exception e) {
            Log.e("wocao", "Error on write File:" + e);
        }
    }

    // 生成文件
    public void makeFilePath(String filePath, String fileName) {
        File file = null;
        makeRootDirectory(filePath);
        try {
            file = new File(filePath + fileName);
            if (!file.exists()) {
                file.createNewFile();
            }else{
            /*  file.delete();
                file.createNewFile();*/
                 Message message = new Message();  
                    message.what = 3;  
                    mHandler.sendMessage(message); 
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return ;
    }


    public int makeFilePath( String fileName) {
        File file = null;
        String filePath = "/sdcard/IntegrateMonitorFile/";
        makeRootDirectory(filePath);
        try {
            file = new File(filePath + fileName);
            if (!file.exists()) {
                file.createNewFile();
            }else{
            /*  file.delete();
                file.createNewFile();*/
                 Message message = new Message();  
                    message.what = 3;  
                    mHandler.sendMessage(message); 
                    return 1;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }

    // 生成文件夹
    public  void makeRootDirectory(String filePath) {
        File file = null;
        try {
            file = new File(filePath);
            if (!file.exists()) {
                file.mkdir();
            }
        } catch (Exception e) {
            Log.i("wocao:", e+"");
        }
    }
}