java 文件复制操作

2019-05-18 07:08:44来源：博客园阅读 ()

本案例采用第三方 jar 包完成，commons-io-2.5.jar,

这个 jar 对文件操作非常方便，大家可以尝试使用一下。

这里贴一个简单的 demo 供大家使用

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

public class MyFileUtils {
    public static void main(String[] args) throws IOException {

        String srcPath = "F:/copyFile/src";
        String destPath = "F:/copyFile/dest123";
        copyFile(srcPath, destPath);

        // copyDirectory(srcPath, destPath);
        // readFileToString(srcPath);
    }

    // 创建文件夹
    public static void makeDir(String destPath) {
        File newFilePath = new File(destPath);
        if (!newFilePath.exists()) {
            newFilePath.mkdirs();
        }
    }

    // 复制文件夹及其内容
    public static void copyDirectory(String srcPath, String destPath) throws IOException {
        File file = new File(srcPath);
        makeDir(destPath);
        File destFile = new File(destPath);
        FileUtils.copyDirectory(file, destFile);
    }

    // 复制文件(应用场景：复制的同时更改文件名称)
    public static void copyFile(String srcPath, String destPath) throws IOException {
        File src = new File(srcPath);
        makeDir(destPath);
        File[] srcFiles = src.listFiles();
        if (srcFiles.length > 0) {
            for (File file : srcFiles) {
                String filename = file.getName();
                if (file.isDirectory()) {
                    copyFile(file.getAbsolutePath(), destPath);
                }
                if (filename.endsWith("html")) {
                    int index = filename.indexOf(".");
                    String newFileName = filename.substring(0, index) + "复制" + filename.substring(index);
                    File destFile = new File(destPath + "/" + newFileName);
                    FileUtils.copyFile(file, destFile);
                }
            }
        }
    }

    // 把文件 内容转成字符串
    public static void readFileToString(String srcPath) throws IOException {
        File src = new File(srcPath);
        File[] srcFiles = src.listFiles();
        if (srcFiles.length > 0) {
            for (File file : srcFiles) {
                String filename = file.getName();
                if (file.isDirectory()) {
                    readFileToString(file.getAbsolutePath());
                }
                if (filename.endsWith("html")) {
                    String str = FileUtils.readFileToString(file, "utf-8");
                    System.out.println(str);
                }
            }
        }
    }
}