Java中新建文件并写入内容工具类

Java代码实现新建文件并写入内容的工具类，内容如下：

package lc.util;

import org.apache.commons.lang.StringUtils;

import java.io.*;

/**
 * @author : https://www.yomige.org/
 */
public class FileUtil {

    /**
     * 创建文件
     *
     * @param fileFullPath 文件完整路径，包括文件名
     * @return 创建成功为true
     */
    public static boolean creatNewFile(String fileFullPath) {
        try {
            File filename = new File(fileFullPath);
            if (!filename.exists()) {
                return filename.createNewFile();
            }
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 写文件
     *
     * @param content      新内容
     * @param fileFullPath 文件完整路径，包括文件名
     * @param isOverwrite  是否覆盖原来内容，false表示追加
     * @throws IOException 异常
     */
    public static boolean writeTxtFile(String content, String fileFullPath, Boolean isOverwrite) throws IOException {
        if (!new File(fileFullPath).exists()) {
            System.out.println("写入文件失败，文件或目录不存在");
            return false;
        }

        if (new File(fileFullPath).isDirectory()) {
            System.out.println("写入文件失败，请指定文件名！");
            return false;
        }
        content = content + "\r\n";

        FileInputStream fileInputStream = null;
        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;

        FileOutputStream fileOutputStream = null;
        PrintWriter pw = null;
        try {
            // 文件路径
            File filePath = new File(fileFullPath);
            StringBuffer newFileStringBuffer = new StringBuffer();
            if (!isOverwrite) {
                // 将文件读入输入流
                fileInputStream = new FileInputStream(filePath);
                inputStreamReader = new InputStreamReader(fileInputStream);
                bufferedReader = new BufferedReader(inputStreamReader);
                // 读取原有的内容
                String line = null;
                while (bufferedReader.ready()) {
                    line = bufferedReader.readLine();
                    newFileStringBuffer = newFileStringBuffer.append(line);
                    // 行与行之间的分隔符 相当于“\n”
                    newFileStringBuffer = newFileStringBuffer.append(System.getProperty("line.separator"));
                }
            }
            //追加新内容
            newFileStringBuffer.append(content);

            fileOutputStream = new FileOutputStream(filePath);
            pw = new PrintWriter(fileOutputStream);
            pw.write(newFileStringBuffer.toString().toCharArray());
            pw.flush();
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            if (pw != null) {
                pw.close();
            }
            if (fileOutputStream != null) {
                fileOutputStream.close();
            }
            if (bufferedReader != null) {
                bufferedReader.close();
            }
            if (inputStreamReader != null) {
                inputStreamReader.close();
            }
            if (fileInputStream != null) {
                fileInputStream.close();
            }
        }
        return true;
    }
}

更新：上面的writeTxtFile()方法写入中文可能存在乱码问题，参考这个方法：https://ych0108.iteye.com/blog/2228834 ，具体代码修改为下方

修改前：

fileOutputStream = new FileOutputStream(filePath);
pw = new PrintWriter(fileOutputStream);
pw.write(newFileStringBuffer.toString().toCharArray());
pw.flush();

修改后：

OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(filePath), "utf-8");
BufferedWriter writer = new BufferedWriter(write);
writer.write(newFileStringBuffer.toString());
writer.close();