java文件输出流是一种用于处理原始二进制数据的字节流类。为了将数据写入到文件中，必须将数据转换为字节，并保存到文件。

复制代码 代码如下:

package com.yiibai.io;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class WriteFileExample {

public static void main(String[] args) {

FileOutputStream fop = null;

File file;

String content = "This is the text content";

try {

file = new File("c:/newfile.txt");

fop = new FileOutputStream(file);

// if file doesnt exists, then create it

if (!file.exists()) {

file.createNewFile();

}

// get the content in bytes

byte[] contentInBytes = content.getBytes();

fop.write(contentInBytes);

fop.flush();

fop.close();

System.out.println("Done");

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (fop != null) {

fop.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

//更新的JDK7例如，使用新的“尝试资源关闭”的方法来轻松处理文件。

package com.yiibai.io;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class WriteFileExample {

public static void main(String[] args) {

File file = new File("c:/newfile.txt");

String content = "This is the text content";

try (FileOutputStream fop = new FileOutputStream(file)) {

// if file doesn't exists, then create it

if (!file.exists()) {

file.createNewFile();

}

// get the content in bytes

byte[] contentInBytes = content.getBytes();

fop.write(contentInBytes);

fop.flush();

fop.close();

System.out.println("Done");

} catch (IOException e) {

e.printStackTrace();

}

}

}