FileUtils.java
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/**
* Copyright 2015-2025 FLY的狐狸(email:jflyfox@sina.com qq:369191470).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.jflyfox.util;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FileUtils {
/**
* 读取文件，返回byte[] 如果不存在，返回null
*
* @param path
* @return
* @throws IOException
*/
public static byte[] read(String path) throws IOException {
int base_size = 1024;
File file = new File(path);
// 不存在创建
if (!file.exists()) {
return null;
}
FileInputStream fis = new FileInputStream(file);
int len = 0;
byte[] dataByte = new byte[base_size];
ByteArrayOutputStream out = new ByteArrayOutputStream(base_size);
while ((len = fis.read(dataByte)) != -1) {
out.write(dataByte, 0, len);
}
byte[] content = out.toByteArray();
fis.close();
out.close();
// 没有读取到数据
if (content.length == 0) {
return null;
}
return content;
}
/**
* 写文件，如果存在，删除
*
* @param path
* @param data
* @throws IOException
*/
public static void write(String path, byte[] data) throws IOException {
File file = new File(path);
// 不存在，创建
if (!file.exists()) {
file.createNewFile();
}
FileOutputStream fos = new FileOutputStream(file);
fos.write(data);
fos.flush();
fos.close();
}
/**
* 查找当前文件下所有properties文件
*
* @param baseDirName
* 查找的文件夹路径
*/
public static List<String> findFiles(String baseDirName) {
List<String> files = new ArrayList<String>();
// 判断目录是否存在
File baseDir = new File(baseDirName);
if (!baseDir.exists() || !baseDir.isDirectory()) {
System.err.println("search error：" + baseDirName + "is not a dir！");
} else {
String[] filelist = baseDir.list();
for (String fileName : filelist) {
files.add(fileName);
}
}
return files;
}
/**
* 查找当前文件下所有properties文件
*
* @param baseDirName
* 查找的文件夹路径
*/
public static List<String> findFileNames(String baseDirName, FileFilter fileFilter) {
List<String> files = new ArrayList<String>();
// 判断目录是否存在
File baseDir = new File(baseDirName);
if (!baseDir.exists() || !baseDir.isDirectory()) {
System.err.println("search error：" + baseDirName + "is not a dir！");
} else {
File[] filelist = baseDir.listFiles(fileFilter);
for (File file : filelist) {
if (file.isFile())
files.add(file.getName());
}
}
return files;
}
}