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feat: [Java 创建和写入文件](https://www.wdbyte.com/java/io/file-create-write/)
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5 files changed

Lines changed: 133 additions & 3 deletions

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‎core-java-modules/core-java-base/src/main/java/com/wdbyte/collection/ArrayListTest4.java‎

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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.function.Function;
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}
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System.out.println(dogMap.get("大黄"));
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List<String> arrayList = new ArrayList();
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arrayList.add("a");
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arrayList.add("b");
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Iterator<String> iterator = arrayList.iterator();
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while (iterator.hasNext()) {
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String next = iterator.next();
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if ("a".equals(next)) {
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iterator.remove();
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}
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}
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System.out.println(arrayList);
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}
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}

‎core-java-modules/core-java-io/README.md‎

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当前模块包含 IO 相关代码
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### 相关文章
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- [Java 创建和写入文件](https://www.wdbyte.com/java/io/file-create-write/)
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- [字符图案，我用字符画个冰墩墩](https://www.wdbyte.com/java/char-image.html)

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

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<packaging>jar</packaging>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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</properties>
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<dependencies>

‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/file/FileCreateAndWriteDemo.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.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.Arrays;
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import java.util.List;
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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 2023/11/06
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*/
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public class FileCreateAndWriteDemo {
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@Test
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public void test0() throws IOException {
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String content = "www.wdbyte.com,java 7";
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String filePath = "/Users/darcy/wdbyte/test0.txt";
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try (FileWriter fw = new FileWriter(filePath);
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BufferedWriter bw = new BufferedWriter(fw)) {
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bw.write(content);
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bw.newLine();
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}
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// 追加模式
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try (FileWriter fw = new FileWriter(filePath, true);
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BufferedWriter bw = new BufferedWriter(fw)) {
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bw.write(content);
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bw.newLine();
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}
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}
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/**
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* JDK 7
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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 test1() throws IOException {
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String content = "www.wdbyte.com, java 7";
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Path path = Paths.get("/Users/darcy/wdbyte/test1.txt");
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// string -> bytes
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Files.write(path, content.getBytes(StandardCharsets.UTF_8));
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}
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/**
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* JDK 7 追加
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* @throws IOException
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*/
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@Test
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public void test2() throws IOException {
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String content = "www.wdbyte.com,java 7" + System.lineSeparator();
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Path path = Paths.get("/Users/darcy/wdbyte/test2.txt");
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Files.write(path, content.getBytes(StandardCharsets.UTF_8), StandardOpenOption.CREATE,
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StandardOpenOption.APPEND);
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Files.write(path, content.getBytes(StandardCharsets.UTF_8), StandardOpenOption.CREATE,
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StandardOpenOption.APPEND);
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}
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/**
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* JDK 7 写入 List
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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 test3() throws IOException {
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List<String> dataList = Arrays.asList("www", "wdbyte", "com", "java 7");
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Path path = Paths.get("/Users/darcy/wdbyte/test3.txt");
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Files.write(path, dataList);
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}
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@Test
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public void test4() throws IOException {
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String content = "www.wdbyte.com,java 7";
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Path path = Paths.get("/Users/darcy/wdbyte/test4.txt");
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// 默认 utf_8
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try (BufferedWriter bw = Files.newBufferedWriter(path)) {
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bw.write(content);
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bw.newLine();
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}
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// 追加模式
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try (BufferedWriter bw = Files.newBufferedWriter(path,
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StandardOpenOption.CREATE, StandardOpenOption.APPEND)) {
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bw.write(content);
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bw.newLine();
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}
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}
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/**
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* JDK 11
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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 test5() throws IOException {
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Path path = Paths.get("/Users/darcy/wdbyte/test5.txt");
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Files.writeString(path, "www.wdbyte.com,java 11");
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}
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}

‎core-java-modules/pom.xml‎

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<module>core-java-os</module>
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</modules>
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<dependencies>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter</artifactId>
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<version>5.9.1</version>
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<!-- <scope>test</scope>-->
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</dependency>
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</dependencies>
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</project>

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