NIO API java.nio (Java Platform SE 8 )

直接上代码

package com.phil.aoplog.util;

import lombok.extern.slf4j.Slf4j;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

@Slf4j
public class MergeUtils {

    public static void main(String[] args) {
        String[] filesToMerge = {"合并1.tmp", "合并2.tmp"};
        String mergedFileName = "合并.txt";
        mergeFiles(filesToMerge, mergedFileName);
    }

    public static void mergeFiles(String[] filesToMerge, String mergedFileName) {
        try (FileChannel outChannel = new FileOutputStream(mergedFileName).getChannel()) {
            for (String file : filesToMerge) {
                try (FileChannel inChannel = new FileInputStream(file).getChannel()) {
                    inChannel.transferTo(0, inChannel.size(), outChannel);
                } catch (IOException e) {
                    log.error("处理文件读取异常");
                }
            }
        } catch (IOException e) {
            log.error("处理文件写入异常");
        }
    }
}

两个需要合并的文件

合并之后的