119 行
3.6 KiB
Java
119 行
3.6 KiB
Java
package com.weilab.biology.util;
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import org.springframework.web.multipart.MultipartFile;
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import java.io.*;
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/**
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* 文件读取工具类
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*/
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public class FileUtils {
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/**
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* MultipartFile 转换成File
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*
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* @param multfile 原文件类型
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* @return File
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*/
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public static File multipartToFile(MultipartFile multfile) {
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File file = null;
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try {
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file = File.createTempFile("prefix", "_" + multfile.getOriginalFilename());
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multfile.transferTo(file);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return file;
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}
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/**
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* 读取文件内容，作为字符串返回
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*/
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public static String readFileAsString(String filePath) throws IOException {
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File file = new File(filePath);
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if (!file.exists()) {
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throw new FileNotFoundException(filePath);
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}
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return readFileAsString(file);
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}
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/**
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* 读取文件内容，作为字符串返回
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*/
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public static String readFileAsString(File file) throws IOException {
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StringBuilder sb = new StringBuilder((int) (file.length()));
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// 创建字节输入流
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FileInputStream fis = new FileInputStream(file);
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// 创建一个长度为10240的Buffer
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byte[] bbuf = new byte[10240];
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// 用于保存实际读取的字节数
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int hasRead = 0;
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while ((hasRead = fis.read(bbuf)) > 0) {
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sb.append(new String(bbuf, 0, hasRead));
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}
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fis.close();
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return sb.toString();
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}
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/**
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* 根据文件路径读取byte[] 数组
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*/
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public static byte[] readFileAsBytes(String filePath) throws IOException {
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File file = new File(filePath);
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if (!file.exists()) {
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throw new FileNotFoundException(filePath);
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} else {
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return readFileAsBytes(file);
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}
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}
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/**
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* 根据文件读取byte[]数组
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*/
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public static byte[] readFileAsBytes(File file) throws IOException {
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if (file == null) {
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throw new FileNotFoundException();
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} else {
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ByteArrayOutputStream bos = new ByteArrayOutputStream((int) file.length());
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BufferedInputStream in = null;
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try {
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in = new BufferedInputStream(new FileInputStream(file));
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short bufSize = 1024;
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byte[] buffer = new byte[bufSize];
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int len1;
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while (-1 != (len1 = in.read(buffer, 0, bufSize))) {
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bos.write(buffer, 0, len1);
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}
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return bos.toByteArray();
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} finally {
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try {
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if (in != null) {
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in.close();
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}
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} catch (IOException var14) {
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var14.printStackTrace();
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}
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bos.close();
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}
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}
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}
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public static void writeStringToFile(String filePath, String content) throws IOException {
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BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(filePath));
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bufferedOutputStream.write(content.getBytes());
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bufferedOutputStream.flush();
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bufferedOutputStream.close();
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}
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public static void writeByteToFile(String filePath, byte[] content) throws IOException {
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BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(filePath));
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bufferedOutputStream.write(content);
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bufferedOutputStream.flush();
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bufferedOutputStream.close();
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}
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}
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