mindol1004/spring-boot-rest
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[BAEL-19088] - Move articles out of core-java-io part 3

Browse Source
This commit is contained in:
catalin-burcea
2019-11-15 11:49:14 +02:00
parent 0950c53112
commit 5ec3630590
95 changed files with 114 additions and 180090 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
core-java-modules/core-java/src/main/java/com/baeldung/fileparser/BufferedReaderExample.java
View File

@@ -1,24 +0,0 @@
package com.baeldung.fileparser;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
public class BufferedReaderExample {
protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
ArrayList<String> result = new ArrayList<>();
try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
while (br.ready()) {
result.add(br.readLine());
}
return result;
}
}
}

31
core-java-modules/core-java/src/main/java/com/baeldung/fileparser/FileReaderExample.java
View File

@@ -1,31 +0,0 @@
package com.baeldung.fileparser;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
public class FileReaderExample {
protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
ArrayList<String> result = new ArrayList<>();
try (FileReader f = new FileReader(filename)) {
StringBuffer sb = new StringBuffer();
while (f.ready()) {
char c = (char) f.read();
if (c == '\n') {
result.add(sb.toString());
sb = new StringBuffer();
} else {
sb.append(c);
}
}
if (sb.length() > 0) {
result.add(sb.toString());
}
}
return result;
}
}

18
core-java-modules/core-java/src/main/java/com/baeldung/fileparser/FilesReadLinesExample.java
View File

@@ -1,18 +0,0 @@
package com.baeldung.fileparser;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
public class FilesReadLinesExample {
protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
List<String> result = Files.readAllLines(Paths.get(filename));
return (ArrayList<String>) result;
}
}

24
core-java-modules/core-java/src/main/java/com/baeldung/fileparser/ScannerIntExample.java
View File

@@ -1,24 +0,0 @@
package com.baeldung.fileparser;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
public class ScannerIntExample {
protected static ArrayList<Integer> generateArrayListFromFile(String filename) throws IOException {
ArrayList<Integer> result = new ArrayList<>();
try (Scanner s = new Scanner(new FileReader(filename))) {
while (s.hasNext()) {
result.add(s.nextInt());
}
return result;
}
}
}

24
core-java-modules/core-java/src/main/java/com/baeldung/fileparser/ScannerStringExample.java
View File

@@ -1,24 +0,0 @@
package com.baeldung.fileparser;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
public class ScannerStringExample {
protected static ArrayList<String> generateArrayListFromFile(String filename) throws IOException {
ArrayList<String> result = new ArrayList<>();
try (Scanner s = new Scanner(new FileReader(filename))) {
while (s.hasNext()) {
result.add(s.nextLine());
}
return result;
}
}
}

19
core-java-modules/core-java/src/test/java/com/baeldung/fileparser/BufferedReaderUnitTest.java
View File

@@ -1,19 +0,0 @@
package com.baeldung.fileparser;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
public class BufferedReaderUnitTest {
protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
@Test
public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
List<String> lines = BufferedReaderExample.generateArrayListFromFile(TEXT_FILENAME);
assertTrue("File does not has 2 lines", lines.size() == 2);
}
}

19
core-java-modules/core-java/src/test/java/com/baeldung/fileparser/FileReaderUnitTest.java
View File

@@ -1,19 +0,0 @@
package com.baeldung.fileparser;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
public class FileReaderUnitTest {
protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
@Test
public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
List<String> lines = FileReaderExample.generateArrayListFromFile(TEXT_FILENAME);
assertTrue("File does not has 2 lines", lines.size() == 2);
}
}

19
core-java-modules/core-java/src/test/java/com/baeldung/fileparser/FilesReadAllLinesUnitTest.java
View File

@@ -1,19 +0,0 @@
package com.baeldung.fileparser;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
public class FilesReadAllLinesUnitTest {
protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
@Test
public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
List<String> lines = FilesReadLinesExample.generateArrayListFromFile(TEXT_FILENAME);
assertTrue("File does not has 2 lines", lines.size() == 2);
}
}

19
core-java-modules/core-java/src/test/java/com/baeldung/fileparser/ScannerIntUnitTest.java
View File

@@ -1,19 +0,0 @@
package com.baeldung.fileparser;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
public class ScannerIntUnitTest {
protected static final String NUMBER_FILENAME = "src/test/resources/sampleNumberFile.txt";
@Test
public void whenParsingExistingTextFile_thenGetIntArrayList() throws IOException {
List<Integer> numbers = ScannerIntExample.generateArrayListFromFile(NUMBER_FILENAME);
assertTrue("File does not has 2 lines", numbers.size() == 2);
}
}

19
core-java-modules/core-java/src/test/java/com/baeldung/fileparser/ScannerStringUnitTest.java
View File

@@ -1,19 +0,0 @@
package com.baeldung.fileparser;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
public class ScannerStringUnitTest {
protected static final String TEXT_FILENAME = "src/test/resources/sampleTextFile.txt";
@Test
public void whenParsingExistingTextFile_thenGetArrayList() throws IOException {
List<String> lines = ScannerStringExample.generateArrayListFromFile(TEXT_FILENAME);
assertTrue("File does not has 2 lines", lines.size() == 2);
}
}

107
core-java-modules/core-java/src/test/java/org/baeldung/java/JavaIoUnitTest.java
View File

@@ -1,107 +0,0 @@
package org.baeldung.java;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Scanner;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.LineIterator;
import org.junit.Ignore;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Charsets;
import com.google.common.io.Files;
@Ignore("need large file for testing")
public class JavaIoUnitTest {
protected final Logger logger = LoggerFactory.getLogger(getClass());
// tests - iterate lines in a file
@Test
public final void givenUsingGuava_whenIteratingAFile_thenCorrect() throws IOException {
final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
logMemory();
Files.readLines(new File(path), Charsets.UTF_8);
logMemory();
}
@Test
public final void givenUsingCommonsIo_whenIteratingAFileInMemory_thenCorrect() throws IOException {
// final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
logMemory();
FileUtils.readLines(new File(path));
logMemory();
}
@Test
public final void whenStreamingThroughAFile_thenCorrect() throws IOException {
final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
logMemory();
FileInputStream inputStream = null;
Scanner sc = null;
try {
inputStream = new FileInputStream(path);
sc = new Scanner(inputStream, "UTF-8");
while (sc.hasNextLine()) {
final String line = sc.nextLine();
// System.out.println(line);
}
// note that Scanner suppresses exceptions
if (sc.ioException() != null) {
throw sc.ioException();
}
} finally {
if (inputStream != null) {
inputStream.close();
}
if (sc != null) {
sc.close();
}
}
logMemory();
}
@Test
public final void givenUsingApacheIo_whenStreamingThroughAFile_thenCorrect() throws IOException {
final String path = "G:\\full\\train\\input\\" + "trainDataNegative.csv";
// final String path = "G:\\full\\train\\input\\" + "trainDataPositive.csv";
logMemory();
final LineIterator it = FileUtils.lineIterator(new File(path), "UTF-8");
try {
while (it.hasNext()) {
final String line = it.nextLine();
// do something with line
}
} finally {
LineIterator.closeQuietly(it);
}
logMemory();
}
// utils
private final void logMemory() {
logger.info("Max Memory: {} Mb", Runtime.getRuntime()
.maxMemory() / 1048576);
logger.info("Total Memory: {} Mb", Runtime.getRuntime()
.totalMemory() / 1048576);
logger.info("Free Memory: {} Mb", Runtime.getRuntime()
.freeMemory() / 1048576);
}
}

2
core-java-modules/core-java/src/test/resources/sampleNumberFile.txt
View File

@@ -1,2 +0,0 @@
111
222

2
core-java-modules/core-java/src/test/resources/sampleTextFile.txt
View File

@@ -1,2 +0,0 @@
Hello
World