Core Java-File

Showing posts with label Core Java-File. Show all posts

How to append content to file in Java

import java.io.File;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.IOException;

public class AppendToFileExample 
{
 public static void main( String[] args )
 { 
 try{
 String data = " This content will append to the end of the file";
 
 File file =new File("javaio-appendfile.txt");
 
 //if file doesnt exists, then create it
 if(!file.exists()){
 file.createNewFile();
 }
 
 //true = append file
 FileWriter fileWritter = new FileWriter(file.getName(),true);
 BufferedWriter bufferWritter = new BufferedWriter(fileWritter);
 bufferWritter.write(data);
 bufferWritter.close();
 
 System.out.println("Done");
 
 }catch(IOException e){
 e.printStackTrace();
 }
 }
}</code></pre>
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">
</code></pre>
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"> <div class="separator" style="clear: both; text-align: center;">
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</pre>
</div>

How to append content to file in Java

FileWritter , a character stream to write characters to file. By default, it will replace all the existing content with new content, howev...

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How to write to file in Java – BufferedWriter

<div dir="ltr" style="text-align: left;" trbidi="on">
In Java, <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">BufferedWriter</code> is a character streams class to handle the character data. Unlike bytes stream (convert data into bytes), you can just write the strings, arrays or characters data directly to file. 
 
 
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">package com.example;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

String content = "This is the content to write into file";

// if file doesnt exists, then create it
 if (!file.exists()) {
 file.createNewFile();
 }

FileWriter fw = new FileWriter(file.getAbsoluteFile());
 BufferedWriter bw = new BufferedWriter(fw);
 bw.write(content);
 bw.close();

System.out.println("Done");

How to write to file in Java – BufferedWriter

In Java, BufferedWriter is a character streams class to handle the character data. Unlike bytes stream (convert data into bytes), you can...

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How to write to file in Java – FileOutputStream

<div dir="ltr" style="text-align: left;" trbidi="on">
In Java, <a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/io/FileOutputStream.html" style="background-color: white; box-sizing: border-box; color: #337ab7; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; text-decoration: none;" target="_blank">FileOutputStream</a> is a bytes stream class that’s used to handle raw binary data. To write the data to file, you have to convert the data into bytes and save it to file. See below full example. 
 
Example: 
package com.example.io; 
 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
 
public class WriteFileExample { 
 public static void main(String[] args) { 
 
 FileOutputStream fop = null; 
 File file; 
 String content = "This is the text content"; 
 
 try { 
 
 file = new File("c:/newfile.txt"); 
 fop = new FileOutputStream(file); 
 
 // if file doesnt exists, then create it 
 if (!file.exists()) { 
 file.createNewFile(); 
 } 
 
 // get the content in bytes 
 byte[] contentInBytes = content.getBytes(); 
 
 fop.write(contentInBytes); 
 fop.flush(); 
 fop.close(); 
 
 System.out.println("Done"); 
 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } finally { 
 try { 
 if (fop != null) { 
 fop.close(); 
 } 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 } 
 } 
 
} 
 
An updated JDK7 example, using new “try resource close” method to handle file easily. 
 
 
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">package com.example.io;

File file = new File("c:/newfile.txt");
 String content = "This is the text content";

try (FileOutputStream fop = new FileOutputStream(file)) {

// if file doesn't exists, then create it
 if (!file.exists()) {
 file.createNewFile();
 }

// get the content in bytes
 byte[] contentInBytes = content.getBytes();

fop.write(contentInBytes);
 fop.flush();
 fop.close();

How to write to file in Java – FileOutputStream

In Java, FileOutputStream is a bytes stream class that’s used to handle raw binary data. To write the data to file, you have to convert t...

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How to read file in Java – BufferedReader

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In Java, there are many ways to read a file, here we show you how to use the simplest and most common-used method –BufferedReader 
 
Example: 
package com.example.io; 
 
import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.IOException; 
 
public class BufferedReaderExample { 
 
 public static void main(String[] args) { 
 
 BufferedReader br = null; 
 
 try { 
 
 String sCurrentLine; 
 
 br = new BufferedReader(new FileReader("C:\\testing.txt")); 
 
 while ((sCurrentLine = br.readLine()) != null) { 
 System.out.println(sCurrentLine); 
 } 
 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } finally { 
 try { 
 if (br != null)br.close(); 
 } catch (IOException ex) { 
 ex.printStackTrace(); 
 } 
 } 
 
 } 
} 
 
.See updated example in JDK 7, which use <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">try-with-resources</code> new feature to close file automatically. 
 
package com.example.io; 
 
import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.IOException; 
 
public class BufferedReaderExample { 
 
 public static void main(String[] args) { 
 
 try (BufferedReader br = new BufferedReader(new FileReader("C:\\testing.txt"))) 
 { 
 
 String sCurrentLine; 
 
 while ((sCurrentLine = br.readLine()) != null) { 
 System.out.println(sCurrentLine); 
 } 
 
 } catch (IOException e) { 
 e.printStackTrace(); 
 }  
 
 } 
 
} 
 
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgceRErJdol2xQVeqJD0FumVQrHbWW4qX3gnxfFyfpSJ_n8Iz5lbo85P5n4PJThTNSQVkNiL9PZMF6npXdbLNa0Too1kDvpDBWXqryPIzq9nEnzs5ps_ePOWAEyVlNxoFF3fDR7yyp5I3vg/s1600/java.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgceRErJdol2xQVeqJD0FumVQrHbWW4qX3gnxfFyfpSJ_n8Iz5lbo85P5n4PJThTNSQVkNiL9PZMF6npXdbLNa0Too1kDvpDBWXqryPIzq9nEnzs5ps_ePOWAEyVlNxoFF3fDR7yyp5I3vg/s1600/java.jpg" /></a></div>
 </div>

How to read file in Java – BufferedReader

In Java, there are many ways to read a file, here we show you how to use the simplest and most common-used method – BufferedReader Exampl...

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How to read file in Java – BufferedInputStream

<div dir="ltr" style="text-align: left;" trbidi="on">
Here is another example to show how to read a file in Java with <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">BufferedInputStream</code> and <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">DataInputStream</code> classes. 
 
The <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">readLine()</code> from the type <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">DataInputStream</code> is deprecated. Sun officially announced this method can not convert property from bytes to characters. It’s advised to use <code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">BufferedReader</code> 
<code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;"> </code>
<code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;">You may interest to read this How to read file from Java – BufferedReader</code> 
<code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;"> </code>
<code style="background-color: #f9f2f4; border-radius: 4px; box-sizing: border-box; color: #c7254e; font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; font-size: 14.4px; padding: 2px 4px;"></code> 
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">package com.example.io;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

File file = new File("C:\\testing.txt");
 FileInputStream fis = null;
 BufferedInputStream bis = null;
 DataInputStream dis = null;

try {
 fis = new FileInputStream(file);

bis = new BufferedInputStream(fis);
 dis = new DataInputStream(bis);

while (dis.available() != 0) {
 System.out.println(dis.readLine());
 }

} catch (IOException e) {
 e.printStackTrace();
 } finally {
 try {
 fis.close();
 bis.close();
 dis.close();
 } catch (IOException ex) {
 ex.printStackTrace();
 }
 }
 }
}</code></pre>
<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">
</code></pre>
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<pre class=" language-java" style="background: rgb(247, 247, 249); border-radius: 0px 0px 4px 4px; border: 1px solid rgb(209, 209, 232); box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: 13px; line-height: 1.5; margin-bottom: 20px; overflow: auto; padding: 1em; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-wrap: normal;"><code class=" language-java" style="background-color: transparent; border-radius: 0px; box-sizing: border-box; direction: ltr; font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace; font-size: inherit; line-height: 1.5; padding: 0px; tab-size: 4; text-shadow: white 0px 1px; word-break: normal; word-spacing: normal;">
</code></pre>
</div>

How to read file in Java – BufferedInputStream

Here is another example to show how to read a file in Java with BufferedInputStream and DataInputStream classes. The readLine() fro...

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How to set the file permission in Java

<div dir="ltr" style="text-align: left;" trbidi="on">
<div style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px;">
In Java, file permissions are very OS specific: *nix , NTFS (windows) and FAT/FAT32, all have different kind of file permissions. Java comes with some generic file permission to deal with it.</div>
<div style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px;">
Check if the file permission allow :</div>
<ol style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px; margin-top: 0px;">
<li style="box-sizing: border-box;">file.canExecute(); – return true, file is executable; false is not.</li>
<li style="box-sizing: border-box;">file.canWrite(); – return true, file is writable; false is not.</li>
<li style="box-sizing: border-box;">file.canRead(); – return true, file is readable; false is not.</li>
</ol>
<div style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px;">
Set the file permission :</div>
<ol style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px; margin-top: 0px;">
<li style="box-sizing: border-box;">file.setExecutable(boolean); – true, allow execute operations; false to disallow it.</li>
<li style="box-sizing: border-box;">file.setReadable(boolean); – true, allow read operations; false to disallow it.</li>
<li style="box-sizing: border-box;">file.setWritable(boolean); – true, allow write operations; false to disallow it.</li>
</ol>
<div style="background-color: white; box-sizing: border-box; color: #333333; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 22.8571px; margin-bottom: 10px;">
In *nix system, you may need to configure more specifies about file permission, e.g set a 777 permission for a file or directory, however, Java IO classes do not have ready method for it, but you can use the following dirty workaround :</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
Runtime.getRuntime().exec("chmod 777 file");</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
Example:</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
package com.example.file;</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
 </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
import java.io.File;</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
import java.io.IOException;</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
 </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
public class FilePermissionExample </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
{</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    public static void main( String[] args )</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    { </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    try {</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
     </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      File file = new File("/example/shellscript.sh");</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      if(file.exists()){</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      System.out.println("Is Execute allow : " + file.canExecute());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
  System.out.println("Is Write allow : " + file.canWrite());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
  System.out.println("Is Read allow : " + file.canRead());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      }</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
         </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      file.setExecutable(false);</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      file.setReadable(false);</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      file.setWritable(false);</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      System.out.println("Is Execute allow : " + file.canExecute());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      System.out.println("Is Write allow : " + file.canWrite());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      System.out.println("Is Read allow : " + file.canRead());</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      if (file.createNewFile()){</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
        System.out.println("File is created!");</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      }else{</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
        System.out.println("File already exists.");</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      }</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      </div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    } catch (IOException e) {</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
      e.printStackTrace();</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    }</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
    }</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
</div>
<div style="background-color: white; box-sizing: border-box; margin-bottom: 10px;">
} 
 
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How to set the file permission in Java

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