66 lines
1.7 KiB
Java
66 lines
1.7 KiB
Java
package com.github.aborn.utils;
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import java.io.*;
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import org.apache.commons.lang3.StringUtils;
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/**
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* @author aborn
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* @date 2021/06/30 11:43 AM
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*/
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public class FileUtils {
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public static void main(String[] args) {
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String file = "/Users/aborn/temp/t.txt";
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System.out.println(read(file));
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}
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/**
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* Read file content as string，
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* null if file doesn't exist or read exception
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*
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* @param fileName 文件名全路径
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* @return file content
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*/
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public static String read(String fileName) {
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if (StringUtils.isBlank(fileName)) {
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return null;
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}
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File file = new File(fileName);
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if (!file.exists()) {
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return null;
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}
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// 再从文件里读
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InputStream inputStream = null;
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try {
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inputStream = new FileInputStream(file);
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// 临时存储 bitSet的 array信息
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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// 缓冲区大小
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int bufferSize = 1024;
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byte[] buffer = new byte[bufferSize];
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int n;
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// 读取到buffer缓冲区，缓冲区大小为bufferSize
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while ((n = inputStream.read(buffer)) != -1) {
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out.write(buffer, 0, n);
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}
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return out.toString();
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} catch (IOException e) {
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e.printStackTrace();
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return null;
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} finally {
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if (inputStream != null) {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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}
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}
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