Here is a sample code which reads the content of a file stored in „src/main/resources“ within a Java project.
First Example
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
| import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyFileReader {
private static final Logger LOG = Logger.getLogger(MyFileReader.class.getName());
// File path: src\main\resources\articles\test.md
public static void main(String[] args) {
String fileSeparator = System.getProperty("file.separator ", "/");
String filePath = "articles" + fileSeparator + "test.md";
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream stream = classLoader.getResourceAsStream(filePath);
if (stream != null) {
LOG.log(Level.INFO, "File found: {0}", filePath);
LOG.log(Level.INFO, "File content: {0}", readFileContent(stream));
} else {
LOG.log(Level.WARNING, "File could not be found: {0}", filePath);
}
}
private static String readFileContent(InputStream stream) {
StringBuilder sb = new StringBuilder();
String line;
// try-with-resources
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (IOException ex) {
logError(ex);
}
return sb.toString();
}
private static void logError(Exception ex) {
LOG.log(Level.WARNING, ex.getLocalizedMessage());
}
} |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
public class MyFileReader {
private static final Logger LOG = Logger.getLogger(MyFileReader.class.getName());
// File path: src\main\resources\articles\test.md
public static void main(String[] args) {
String fileSeparator = System.getProperty("file.separator ", "/");
String filePath = "articles" + fileSeparator + "test.md";
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream stream = classLoader.getResourceAsStream(filePath);
if (stream != null) {
LOG.log(Level.INFO, "File found: {0}", filePath);
LOG.log(Level.INFO, "File content: {0}", readFileContent(stream));
} else {
LOG.log(Level.WARNING, "File could not be found: {0}", filePath);
}
}
private static String readFileContent(InputStream stream) {
StringBuilder sb = new StringBuilder();
String line;
// try-with-resources
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (IOException ex) {
logError(ex);
}
return sb.toString();
}
private static void logError(Exception ex) {
LOG.log(Level.WARNING, ex.getLocalizedMessage());
}
}
Second Example
Using:
- Input Stream
- Output Stream
- Message Template
- String Format
- try-with-resources Statement
package com.welovecoding.web.blog.pusher;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Main {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
String line = "";
File file = new File("src/main/resources/test.md");
try (
InputStream stream = new FileInputStream(file);
BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))
) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (FileNotFoundException fileException) {
LOG.log(Level.WARNING, "File cannot be found at: {0}", file.getAbsolutePath());
} catch (IOException readException) {
LOG.log(Level.SEVERE, "Error reading file: {0}", readException.getLocalizedMessage());
}
String formattedString = String.format("Result:\r\n%s", sb.toString());
System.out.println(formattedString);
}
private static final Logger LOG = Logger.getLogger(Main.class.getName());
} |
package com.welovecoding.web.blog.pusher;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Main {
public static void main(String[] args) {
StringBuilder sb = new StringBuilder();
String line = "";
File file = new File("src/main/resources/test.md");
try (
InputStream stream = new FileInputStream(file);
BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))
) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (FileNotFoundException fileException) {
LOG.log(Level.WARNING, "File cannot be found at: {0}", file.getAbsolutePath());
} catch (IOException readException) {
LOG.log(Level.SEVERE, "Error reading file: {0}", readException.getLocalizedMessage());
}
String formattedString = String.format("Result:\r\n%s", sb.toString());
System.out.println(formattedString);
}
private static final Logger LOG = Logger.getLogger(Main.class.getName());
}
Third example
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Parser {
public Parser() {
}
public void parse(String filePath) {
if (filePath == null || filePath.isEmpty()) {
filePath = "editorconfig-test.ini";
}
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream stream = classLoader.getResourceAsStream(filePath);
StringBuilder sb = new StringBuilder();
String line;
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (IOException ex) {
Logger.getLogger(Parser.class.getName()).log(Level.SEVERE, "Error reading file: {0}", ex.getMessage());
} finally {
System.out.println(sb.toString());
}
}
} |
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Parser {
public Parser() {
}
public void parse(String filePath) {
if (filePath == null || filePath.isEmpty()) {
filePath = "editorconfig-test.ini";
}
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream stream = classLoader.getResourceAsStream(filePath);
StringBuilder sb = new StringBuilder();
String line;
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
while ((line = reader.readLine()) != null) {
sb.append(line);
sb.append(System.getProperty("line.separator", "\r\n"));
}
} catch (IOException ex) {
Logger.getLogger(Parser.class.getName()).log(Level.SEVERE, "Error reading file: {0}", ex.getMessage());
} finally {
System.out.println(sb.toString());
}
}
}