要合并目录中所有文件的内容，Java代码如下 −
示例
import java.io.*;
public class Demo{
public static void main(String[] args) throws IOException{
File my_dir = new File("path to place where file is generated");
PrintWriter my_writer = new PrintWriter("The .txt where changes are stored");
String[] file_names = my_dir.list();
for (String file_names : fileNames){
System.out.println("Content read from " + file_names);
File my_file = new File(my_dir, file_names);
BufferedReader my_reader = new BufferedReader(new FileReader(my_file));
my_writer.println("The file contains " + file_names);
String my_line = my_reader.readLine();
while (my_line != null){
my_writer.println(my_line);
my_line = my_reader.readLine();
}
my_writer.flush();
}
System.out.println("All data from files have been read and " + my_dir.getName() + "merged");
}
}输出
All file contents will be merged into a single text file.
名为 Demo 的类包含 main 函数。将创建一个新文件类型及其位置 需要创建新文件的位置作为参数传递给它。
创建一个 PrintWriter 实例，并将目录中存在的文件名存储在字符串中 array。文件名被迭代，并使用BufferedReader实例进行读取。无论读取到什么内容，都会保留 写入新文件并存储。写入器也被冲洗，因此不会留下任何残留物。
