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niumooniumoo
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feat: 增加文件IO操作
1 parent bcc1c8b commit 09d3bde

4 files changed

Lines changed: 269 additions & 3 deletions

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‎core-java-modules/core-java-io/pom.xml‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -22,10 +22,14 @@
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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<version>31.0.1-jre</version>
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<type>jar</type>
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<scope>provided</scope>
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<version>32.1.3-jre</version>
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</dependency>
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<dependency>
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<groupId>commons-io</groupId>
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<artifactId>commons-io</artifactId>
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<version>2.7</version>
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</dependency>
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</dependencies>
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</project>

‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/file/FileAppendDemo.java‎

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package com.wdbyte.io.file;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.nio.file.StandardOpenOption;
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import java.util.ArrayList;
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import java.util.List;
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import com.google.common.base.Charsets;
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import com.google.common.io.FileWriteMode;
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import org.apache.commons.io.FileUtils;
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import org.junit.jupiter.api.Test;
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/**
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* @author niulang
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* @date 2023/12/12
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*/
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public class FileAppendDemo {
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@Test
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public void appendLine1() throws IOException {
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Path path = Paths.get("/Users/darcy/wdbyte/test1.txt");
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// 写入一行数据
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Files.write(path, "line append1".getBytes(StandardCharsets.UTF_8),
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StandardOpenOption.CREATE, StandardOpenOption.APPEND);
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// 写入一个换行符
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Files.write(path, System.lineSeparator().getBytes(StandardCharsets.UTF_8),
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StandardOpenOption.APPEND);
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}
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@Test
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public void appendLine2() throws IOException {
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String path = "/Users/darcy/wdbyte/test1.txt";
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try (FileWriter fileWriter = new FileWriter(path, true)) {
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fileWriter.write("line append2");
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fileWriter.write(System.lineSeparator());
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}
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}
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@Test
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public void appendLine3() throws IOException {
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String path = "/Users/darcy/wdbyte/test1.txt";
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try (FileWriter fileWriter = new FileWriter(path, true)) {
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BufferedWriter bw = new BufferedWriter(fileWriter);
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bw.write("line append3");
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bw.newLine();
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}
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}
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@Test
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public void appendLine4() throws IOException {
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String path = "/Users/darcy/wdbyte/test1.txt";
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try (FileOutputStream fileOutputStream = new FileOutputStream(path, true)) {
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fileOutputStream.write("line append4".getBytes(StandardCharsets.UTF_8));
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fileOutputStream.write(System.lineSeparator().getBytes(StandardCharsets.UTF_8));
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}
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}
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/**
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* java 11 Files.writeString
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* @throws IOException
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*/
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public void appendLineJava11() throws IOException {
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Path path = Paths.get("/Users/darcy/wdbyte/test1.txt");
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Files.writeString(path, "line appendLineJava11",
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StandardOpenOption.CREATE,
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StandardOpenOption.APPEND);
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}
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/**
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* Java 8
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*
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* @throws IOException
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*/
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@Test
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public void appendLineJava8() throws IOException {
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Path path = Paths.get("/Users/darcy/wdbyte/test1.txt");
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List<String> dataList = new ArrayList<>();
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dataList.add("line1 appendLineJava8");
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dataList.add("line2 appendLineJava8");
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dataList.add("line3 appendLineJava8");
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Files.write(path, dataList,
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StandardOpenOption.CREATE,
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StandardOpenOption.APPEND);
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Files.write(path, System.lineSeparator().getBytes(StandardCharsets.UTF_8),
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StandardOpenOption.CREATE,
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StandardOpenOption.APPEND);
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}
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@Test
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public void appendLineList() throws IOException {
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String path = "/Users/darcy/wdbyte/test1.txt";
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List<String> dataList = new ArrayList<>();
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dataList.add("line1 appendLineList");
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dataList.add("line2 appendLineList");
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dataList.add("line3 appendLineList");
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try (FileWriter fileWriter = new FileWriter(path, true)) {
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BufferedWriter bw = new BufferedWriter(fileWriter);
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for (String data : dataList) {
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bw.write(data);
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bw.newLine();
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}
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}
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}
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@Test
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public void appendByCommonsIo() throws IOException {
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File file = new File("/Users/darcy/wdbyte/test1.txt");
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String content = "hello commons io,appendByCommonsIo";
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FileUtils.writeStringToFile(file, content, StandardCharsets.UTF_8, true);
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FileUtils.writeStringToFile(file, System.lineSeparator(), StandardCharsets.UTF_8, true);
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}
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@Test
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public void appendListByCommonsIo() throws IOException {
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File file = new File("/Users/darcy/wdbyte/test1.txt");
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List<String> dataList = new ArrayList<>();
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dataList.add("line1 hello commons io,appendListByCommonsIo");
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dataList.add("line2 hello commons io,appendListByCommonsIo");
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dataList.add("line3 hello commons io,appendListByCommonsIo");
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FileUtils.writeLines(file, dataList, true);
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}
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@Test
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public void appendData(){
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// 创建File对象指向要追加内容的文件
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File file = new File("/Users/darcy/wdbyte/test1.txt");
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// 要追加的内容
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String contentToAppend = "Hello, Guava!";
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try {
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// 使用Guava的Files类以追加模式写入内容
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com.google.common.io.Files.asCharSink(file, Charsets.UTF_8, FileWriteMode.APPEND)
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.write(contentToAppend);
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// 如果需要追加新行，可以使用下面的代码
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com.google.common.io.Files.asCharSink(file, Charsets.UTF_8, com.google.common.io.FileWriteMode.APPEND)
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.write(contentToAppend + System.lineSeparator());
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System.out.println("Content appended successfully.");
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} catch (IOException e) {
150+
System.err.println("Error appending content to file: " + e.getMessage());
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}
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}
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@Test
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public void appendDataListByGuava(){
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// 创建File对象指向要追加内容的文件
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File file = new File("/Users/darcy/wdbyte/test1.txt");
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// 要追加的内容
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List<String> dataList = new ArrayList<>();
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dataList.add("line1 hello commons io,appendDataListByGuava");
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dataList.add("line2 hello commons io,appendDataListByGuava");
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dataList.add("line3 hello commons io,appendDataListByGuava");
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try {
166+
// 使用Guava的Files类以追加模式写入内容
167+
com.google.common.io.Files.asCharSink(file, Charsets.UTF_8, FileWriteMode.APPEND)
168+
.writeLines(dataList);
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170+
System.out.println("Content appended successfully.");
171+
} catch (IOException e) {
172+
System.err.println("Error appending content to file: " + e.getMessage());
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}
174+
}
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}

‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/file/FileDelete.java‎

Lines changed: 73 additions & 0 deletions
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@@ -0,0 +1,73 @@
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package com.wdbyte.io.file;
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3+
import java.io.File;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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8+
import org.apache.commons.io.FileUtils;
9+
import org.junit.jupiter.api.Test;
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/**
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* @author niulang
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* @date 2023/12/18
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*/
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public class FileDelete {
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@Test
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public void deleteFile() {
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Path path = Paths.get("/Users/darcy/wdbyte/test.txt");
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try {
21+
Files.delete(path);
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System.out.println("文件删除成功");
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} catch (Exception e) {
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System.out.println("文件删除失败");
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e.printStackTrace();
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}
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}
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@Test
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public void deleteIfExists() {
31+
Path path = Paths.get("/Users/darcy/wdbyte/test.txt");
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try {
33+
boolean deleted = Files.deleteIfExists(path);
34+
if (deleted) {
35+
System.out.println("文件删除成功");
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} else {
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System.out.println("文件不存在或者无法删除");
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}
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} catch (Exception e) {
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System.out.println("文件删除失败");
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e.printStackTrace();
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}
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}
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@Test
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public void delete() {
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File file = new File("/Users/darcy/wdbyte/test.txt");
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if (file.delete()) {
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System.out.println("文件删除成功");
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} else {
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System.out.println("文件删除失败");
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}
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}
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@Test
56+
public void deleteOnExit() {
57+
File file = new File("/Users/darcy/wdbyte/test.txt");
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file.deleteOnExit();
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}
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@Test
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public void forceDelete() {
63+
File file = new File("/Users/darcy/wdbyte/test.txt");
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try {
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FileUtils.forceDelete(file);
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System.out.println("文件删除成功");
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} catch (Exception e) {
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System.out.println("文件删除失败");
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e.printStackTrace();
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}
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}
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}

‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/file/FileReadDemo.java‎

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Original file line numberDiff line numberDiff line change
@@ -15,6 +15,7 @@
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import java.util.Scanner;
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import java.util.stream.Stream;
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18+
import org.apache.commons.io.FileUtils;
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import org.junit.jupiter.api.Test;
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2021
/**
@@ -165,4 +166,13 @@ public void test8() {
165166
e.printStackTrace();
166167
}
167168
}
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@Test
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public void readFileByApacheCommons() throws IOException {
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File file = new File("/Users/darcy/wdbyte/test.txt");
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List<String> list = FileUtils.readLines(file, StandardCharsets.UTF_8);
174+
for (String data : list) {
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System.out.println(data);
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}
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}
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}

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