复制旧路径下的部分文件到一个新路径下

浅浅的花香味﹌ 2023-01-03 04:12 101阅读 0赞

package com.centrin.process.utils;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.List;
    
    public class CopyFileUtils { 
        /** * 把fileNameList中的文件名的文件从旧路径copy到新路径下 * @param oldPath * @param newPath * @param fileNameList * @throws IOException */
        public static void copyFile(String oldPath, String newPath, List<String> fileNameList) throws IOException { 
            System.out.println("oldPath: " + oldPath);  //D:/opt/data/txt/20201115
            System.out.println("newPath: " + newPath);  //D:/opt/data/temp/20201115-8imx2v-1/txt
            System.out.println("fileNameList: " + fileNameList);    //[a1.txt, a2.txt, a3.txt, a4.txt]
    
            for (int i = 0; i < fileNameList.size(); i++) { 
                String fileOldPath = oldPath + "/" + fileNameList.get(i);
                File file = new File(fileOldPath);
                File copyFile = null;
    
                if (file.exists()) { 		//当第一个文件存在的时候
                    copyFile = new File(newPath);
                    if (!copyFile.exists()) { 	//如果copyfile不存在的话，就新建文件夹
                        copyFile.mkdirs();
                    }
    
                    //文件io
                    FileInputStream in = new FileInputStream(new File(fileOldPath));
                    FileOutputStream out = new FileOutputStream(new File(newPath + "/" + fileNameList.get(i)));
                    byte[] buff = new byte[512];
                    int n = 0;
                    System.out.println("复制文件：\n源路径：" + fileOldPath + "\n" + "目标路径：" + newPath + "/" + fileNameList.get(i));
                    while ((n = in.read(buff)) != -1) { 
                        out.write(buff, 0, n);
                    }
                    out.flush();
                    in.close();
                    out.close();
                    System.out.println("复制完成");
                } else { 
                    System.out.println("源文件不存在");
                }
            }
            System.out.println("执行成功");
        }
    }