Java sample code 02

I communicated the source posted in SAMPLE GALLERY and added an import statement.

2.FileIO --Write to text file --Insert line breaks in text files --Reading a text file --Loading web page content --Copy file to another file --Specify the character code and read the text file (measures against garbled characters) --Write a string to a text file --Read a text file string

2-1. Write to a text file

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class SampleOutputStream {

    public static void main(String[] args) throws IOException {
        String text = "Hello World.";
        byte[] data = text.getBytes();
        OutputStream out = null;
        try {
            out = new FileOutputStream("OutputText.txt");//The file to be written is specified here.
            out.write(data);//I am writing characters here.
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                out.close();
            }
        }

    }

}

2-2. Insert a line break in the text file

import java.io.*;

public class SampleOutputStream {

    private static final String NEW_LINE = "\n";//Line feed code constant

    public static void main(String[] args) throws IOException {
        String text = "Hello World.";
        byte[] data = text.getBytes();
        OutputStream out = null;
        try {
            out = new FileOutputStream("OutputText.txt");
            out.write(data);//The first line
            out.write(NEW_LINE.getBytes());//new line
            out.write(data);//2nd line
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                out.close();
            }
        }
        //Get the absolute path of the file
        File file = new File("OutputText.txt");
        String str = file.getAbsolutePath();
        System.out.println("pass : " + str);

    }

}

2-3. Reading a text file

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

public class SampleInputStream {

    public static void main(String[] args) throws IOException {
        InputStream in = null;
        try {
            in = new FileInputStream("InputText.txt");
            int i = -1;

            //I'm reading a file.
            //read()When the method goes to the end-Because it returns 1.-Turn the loop until 1 is returned.
            while ((i = in.read()) != -1) {
                char character = (char) i;
                System.out.print(character);//Output to console
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                in.close();
            }
        }

    }

}

2-4. Loading the contents of the web page

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

public class SampleInputStream {
    public static void main(String[] args) throws IOException {
        //proxy settings
        System.setProperty("http.proxyHost","test.proxy.com");
        System.setProperty("http.proxyPort","8081");
        System.setProperty("https.proxyHost","test.proxy..com");
        System.setProperty("https.proxyPort","8081");
        System.setProperty("http.nonProxyHosts","localhost|*.nonproxy.com");
        URL url = new URL("https://www.google.co.jp/");//Specify a web page.
        InputStream in = null;
        try {
            in = url.openStream();
            int i = -1;
            while ((i = in.read()) != -1) {
                char character = (char) i;
                System.out.print(character);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                in.close();
            }
        }

    }

}

2-5. Copy file to another file

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

public class SampleOutputStream {

    public static void main(String[] args) throws IOException {
        FileInputStream in = null;
        FileOutputStream out = null;
        FileChannel inChannel = null;
        FileChannel outChannel = null;
        try {
            in = new FileInputStream("InputText.txt");//Specify the copy source file
            out = new FileOutputStream("OutputText.txt");//Specify the copy destination file
            inChannel = in.getChannel();
            outChannel = out.getChannel();
            inChannel.transferTo(0, inChannel.size(), outChannel);//Copy file
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (outChannel != null) {
                outChannel.close();
            }
            if (inChannel != null) {
                inChannel.close();
            }
            if (out != null) {
                out.close();
            }
            if (in != null) {
                in.close();
            }
        }

    }

}

2-6. Specify the character code and read the text file (measures against garbled characters)

import java.io.*;

public class SampleInputStream {

    public static void main(String[] args) throws IOException {
        InputStream in = null;
        InputStreamReader inr = null;
        try {
            in = new FileInputStream("InputText.txt");
            inr = new InputStreamReader(in, "UTF-8");//The character code is specified here.
            int i = -1;

            while ((i = inr.read()) != -1) {
                char character = (char) i;
                System.out.print(character);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (inr != null) {
                inr.close();
            }
            if (in != null) {
                in.close();
            }
        }

    }

}

2-7. Write a character string to a text file

import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;

public class SampleOutputStream {

    public static void main(String[] args) throws IOException {
        FileWriter out = null;
        try {
            out = new FileWriter("OutputText.txt");
            out.write("Hello World.");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                out.close();
            }
        }

    }

}

2-8. Read the character string of the text file

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class SampleBufferedReader {

    public static void main(String[] args) throws IOException {
        FileReader fr = null;
        BufferedReader br = null;
        try {
            fr = new FileReader("InputText.txt");
            br = new BufferedReader(fr);
            String line = null;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                br.close();
            }
            if (fr != null) {
                fr.close();
            }
        }

    }

}