java如何合并多个文件

Java中合并子文件最容易想到的就是利用BufferedStream进行读写。

具体的实现方式如下，代码很详细，供各位参考学习。

1、首先创建mergeFiles方法，接收字符串数组和字符串参数，并完成文件合并功能

public static boolean mergeFiles(String[] fpaths, String resultPath) {     if (fpaths == null || fpaths.length < 1 || TextUtils.isEmpty(resultPath)) {         return false;     }     if (fpaths.length == 1) {         return new File(fpaths[0]).renameTo(new File(resultPath));     }      File[] files = new File[fpaths.length];     for (int i = 0; i < fpaths.length; i ++) {         files[i] = new File(fpaths[i]);         if (TextUtils.isEmpty(fpaths[i]) || !files[i].exists() || !files[i].isFile()) {             return false;         }     }      File resultFile = new File(resultPath);      try {         int bufSize = 1024;         BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(resultFile));         byte[] buffer = new byte[bufSize];          for (int i = 0; i < fpaths.length; i ++) {             BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(files[i]));             int readcount;             while ((readcount = inputStream.read(buffer)) > 0) {                 outputStream.write(buffer, 0, readcount);             }             inputStream.close();         }         outputStream.close();     } catch (FileNotFoundException e) {         e.printStackTrace();         return false;     } catch (IOException e) {         e.printStackTrace();         return false;     }      for (int i = 0; i < fpaths.length; i ++) {         files[i].delete();     }      return true; }

2、然后在main函数中对mergeFiles方法进行调用，使用时传入多个文件的地址数组，并传入输出文件地址即可。

public static void main(String[] args) {           mergeFiles(new String[]{"D:/in_1.txt", "D:/in_2.txt", "D:/in_3.txt"}, "D:/output.txt"); }

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