com.ppcxy.cyfm.showcase.demos.utilities.io.IODemo.java Source code

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Here is the source code for com.ppcxy.cyfm.showcase.demos.utilities.io.IODemo.java

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/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/
package com.ppcxy.cyfm.showcase.demos.utilities.io;

import com.google.common.base.Charsets;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.input.ReaderInputStream;
import org.apache.commons.io.output.WriterOutputStream;
import org.junit.Test;
import org.springside.modules.utils.Exceptions;

import java.io.*;
import java.util.List;

/**
 * ??IO?.
 *
 * @author calvin
 */
public class IODemo {

    @Test
    public void workWithFileContent() {
        File file = new File("woop.txt");
        File destFile = new File("bar.txt");
        try {
            // text -> file, Collection<String>, byte[] ->file
            FileUtils.writeStringToFile(file, "Hey sailor!\nHaha\n", "UTF-8");

            // inputstream -> file
            InputStream source = IOUtils.toInputStream("Hej", "UTF-8");
            FileUtils.copyInputStreamToFile(source, file);

            // ///////////////////////////
            // file -> outputstream
            System.out.println("copy File to outputstream:");
            FileUtils.copyFile(file, System.out);

            // file -> file
            FileUtils.copyFile(file, destFile);

            // file -> string
            System.out.println("File to String:");
            System.out.println(FileUtils.readFileToString(file, "UTF-8"));

            // file -> list<string>
            System.out.println("File to List<String>:");
            List<String> lines = FileUtils.readLines(file, "UTF-8");
            for (String string : lines) {
                System.out.println(string);
            }
        } catch (IOException e) {
            Exceptions.unchecked(e);
        }
    }

    /*
     * String/Input/OutputStream/Reader/Writer
     */
    @Test
    public void workWithStream() {
        InputStream in = null;
        try {
            String content = "Stream testing";

            // String - > InputStream.
            in = IOUtils.toInputStream(content, "UTF-8");

            // String - > OutputStream
            System.out.println("String to OutputStram:");
            IOUtils.write(content, System.out, "UTF-8");

            // //////////////////
            // InputStream/Reader -> String
            System.out.println("\nInputStram to String:");
            System.out.println(IOUtils.toString(in, "UTF-8"));

            // InputStream/Reader -> OutputStream/Writer ???.
            InputStream in2 = IOUtils.toInputStream(content); // ?inputSteam
            System.out.println("InputStream to OutputStream:");
            IOUtils.copy(in2, System.out);

            // /////////////////
            // InputStream ->Reader
            InputStreamReader reader = new InputStreamReader(in, Charsets.UTF_8);
            // Reader->InputStream
            ReaderInputStream in3 = new ReaderInputStream(reader, Charsets.UTF_8);

            // OutputStream ->Writer
            OutputStreamWriter writer = new OutputStreamWriter(System.out, Charsets.UTF_8);
            // Writer->OutputStream
            WriterOutputStream out2 = new WriterOutputStream(writer, Charsets.UTF_8);

            // ////////////////////
            // WriterString.
            StringWriter sw = new StringWriter();
            sw.write("I am String writer");
            System.out.println("\nCollect writer content:");
            System.out.println(sw.toString());

        } catch (IOException e) {
            Exceptions.unchecked(e);
        } finally {
            // ?Stream
            IOUtils.closeQuietly(in);
        }
    }

    @Test
    public void workWithFileAndDir() {
        // FileUtilsJavaDoc??
    }
}