用Java編寫文本文件的最簡單方法是什么？

Question

我想知道用 Java 編寫文本文件的最簡單（也是最簡單）的方法是什么。 請簡單點，因為我是初學者：D

我在網上搜索並找到了這段代碼，但我理解了其中的 50%。

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

public class WriteToFileExample {
public static void main(String[] args) {
    try {

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

        File file = new  File("C:/Users/Geroge/SkyDrive/Documents/inputFile.txt");

        // 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");

    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

Answer 1

對於 Java 7 及更高版本，使用Files 的單行：

String text = "Text to save to file";
Files.write(Paths.get("./fileName.txt"), text.getBytes());

Answer 2

您可以通過使用JAVA 7 new File API來做到這一點。

代碼示例：`

public class FileWriter7 {
    public static void main(String[] args) throws IOException {
        List<String> lines = Arrays.asList(new String[] { "This is the content to write into file" });
        String filepath = "C:/Users/Geroge/SkyDrive/Documents/inputFile.txt";
        writeSmallTextFile(lines, filepath);
    }

    private static void writeSmallTextFile(List<String> aLines, String aFileName) throws IOException {
        Path path = Paths.get(aFileName);
        Files.write(path, aLines, StandardCharsets.UTF_8);
    }
}

`

Answer 3

您可以使用 Apache Commons 中的FileUtils ：

import org.apache.commons.io.FileUtils;

final File file = new File("test.txt");
FileUtils.writeStringToFile(file, "your content", StandardCharsets.UTF_8);

Answer 4

附加文件FileWriter(String fileName, boolean append)

try {   // this is for monitoring runtime Exception within the block 

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

        File file = new  File("C:/Users/Geroge/SkyDrive/Documents/inputFile.txt"); // here file not created here

        // if file doesnt exists, then create it
        if (!file.exists()) {   // checks whether the file is Exist or not
            file.createNewFile();   // here if file not exist new file created 
        }

        FileWriter fw = new FileWriter(file.getAbsoluteFile(), true); // creating fileWriter object with the file
        BufferedWriter bw = new BufferedWriter(fw); // creating bufferWriter which is used to write the content into the file
        bw.write(content); // write method is used to write the given content into the file
        bw.close(); // Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect. 

        System.out.println("Done");

    } catch (IOException e) { // if any exception occurs it will catch
        e.printStackTrace();
    }

Answer 5

你的代碼是最簡單的。 但是，我總是嘗試進一步優化代碼。 這是一個示例。

try (BufferedWriter bw = new BufferedWriter(new FileWriter(new File("./output/output.txt")))) {
    bw.write("Hello, This is a test message");
    bw.close();
    }catch (FileNotFoundException ex) {
    System.out.println(ex.toString());
    }

Answer 6

Files.write() 是@Dilip Kumar 所說的簡單解決方案。 我曾經使用這種方式，直到我遇到問題，無法影響行分隔符（Unix/Windows）CR LF。

所以現在我使用 Java 8 流文件寫入方式，什么讓我可以即時操作內容。 :)

List<String> lines = Arrays.asList(new String[] { "line1", "line2" });

Path path = Paths.get(fullFileName);
try (BufferedWriter writer = Files.newBufferedWriter(path)) {   
    writer.write(lines.stream()
                      .reduce((sum,currLine) ->  sum + "\n"  + currLine)
                      .get());
}     

通過這種方式，我可以指定行分隔符，或者我可以做任何類型的魔術，如 TRIM、大寫、過濾等。

Answer 7

String content = "your content here";
Path path = Paths.get("/data/output.txt");
if(!Files.exists(path)){
    Files.createFile(path);
}
BufferedWriter writer = Files.newBufferedWriter(path);
writer.write(content);

Answer 8

在Java 11或更高版本中，可以從java.nio.file.Files使用writeString ，

String content = "This is my content";
String fileName = "myFile.txt";
Files.writeString(Paths.get(fileName), content); 

有選項：

Files.writeString(Paths.get(fileName), content, StandardOpenOption.CREATE)

有關java.nio.file.Files和StandardOpenOption 的更多文檔

Answer 9

File file = new File("path/file.name");
IOUtils.write("content", new FileOutputStream(file));

IOUtils 也可用於使用 java 8 輕松寫入/讀取文件。