fileoutputstream

I am confused about this. Since when doing implementation of Serializable class, we need to use classes like FileOutputStream , ObjectOutputStream or something like that. Then why not we just use those classes to do things like output a object to a file and input a object from a file to maintain the status of a object directly? Why should we first implement Serializable and then do the same thing? Understand it like this... Serializable is marker interface which denotes that the object of your class can be converted into byte stream and eventually back into java object if required. Initially

I have an app that saves into a file (internal storage) data input by the user and at startup it loads this file and shows the contents. I would like to know: where can I find my file ( data.txt )? In addition, if I input "Hello" and then "World" when I load the file, I see "HelloWorld" in the same line but I want "Hello" and "World" printed on two different lines. For saving file: public void writeToFile(String data) { try { FileOutputStream fou = openFileOutput("data.txt", MODE_APPEND); OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fou); outputStreamWriter.write(data);

I want to overwrite/reuse the existing output directory when I run my Hadoop job daily. Actually the output directory will store summarized output of each day's job run results. If I specify the same output directory it gives the error "output directory already exists". How to bypass this validation? What about deleting the directory before you run the job? You can do this via shell: hadoop fs -rmr /path/to/your/output/ or via the Java API: // configuration should contain reference to your namenode FileSystem fs = FileSystem.get(new Configuration()); // true stands for recursively deleting the

I have a module that is responsible for reading, processing, and writing bytes to disk. The bytes come in over UDP and, after the individual datagrams are assembled, the final byte array that gets processed and written to disk is typically between 200 bytes and 500,000 bytes. Occassionally, there will be byte arrays that, after assembly, are over 500,000 bytes, but these are relatively rare. I'm currently using the FileOutputStream 's write(byte\[\]) method . I'm also experimenting with wrapping the FileOutputStream in a BufferedOutputStream , including using the constructor that accepts a

In my client-server application, when I try to download a file from the serverSide, the file gets downloaded; but the header information such as some additional text with line break can't be read. As you can see in my Server class this following information is supposed to be printed out in the client side. outputToClient.printf("Status OK\r\nSize %d Bytes\r\n\r\nFile %s Download was successfully\r\n", fileSize, filename); But it doesn't. Only the fisrt string ( Status OK ) before the \r\n gets printed, not any string after \r\n . How can I fix it? My complete code: ServerSide: public class

I have a file with Chinese characters text inside, I want to copy those text over to another file. But the file output messes with the chinese characters. Notice that in my code I am using "UTF8" as my encoding already: BufferedReader br = new BufferedReader(new FileReader(inputXml)); StringBuilder sb = new StringBuilder(); String line = br.readLine(); while (line != null) { sb.append(line); sb.append("\n"); line = br.readLine(); } String everythingUpdate = sb.toString(); Writer out = new BufferedWriter(new OutputStreamWriter( new FileOutputStream(outputXml), "UTF8")); out.write(""); out.write