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java如何保存文件

2026-02-04 19:24:53Java

保存文件的方法

在Java中保存文件可以通过多种方式实现，主要涉及java.io和java.nio包中的类。以下是几种常见的方法：

使用FileOutputStream保存字节数据

import java.io.FileOutputStream;
import java.io.IOException;

public class SaveFileExample {
    public static void main(String[] args) {
        String data = "Hello, World!";
        String filePath = "example.txt";

        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            byte[] bytes = data.getBytes();
            fos.write(bytes);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用BufferedWriter保存文本数据

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

public class SaveFileExample {
    public static void main(String[] args) {
        String data = "Hello, World!";
        String filePath = "example.txt";

        try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
            writer.write(data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用Files类（Java NIO）

import java.nio.file.Files;
import java.nio.file.Paths;
import java.io.IOException;

public class SaveFileExample {
    public static void main(String[] args) {
        String data = "Hello, World!";
        String filePath = "example.txt";

        try {
            Files.write(Paths.get(filePath), data.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用PrintWriter格式化输出

import java.io.PrintWriter;
import java.io.IOException;

public class SaveFileExample {
    public static void main(String[] args) {
        String data = "Hello, World!";
        String filePath = "example.txt";

        try (PrintWriter writer = new PrintWriter(filePath)) {
            writer.println(data);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}