BufferedInputStream read vs IOUtils toByteArray - 腾讯云开发者社区

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PGP加解密

comData.open(bOut), PGPLiteralData.BINARY, new File(fileName)); comData.close(); return bOut.toByteArray...* * @param input stream to read the secret key ring collection from....(keyIn); IOUtils.closeQuietly(in); IOUtils.closeQuietly(signIn); }...outputBytes)); byte[] b = new byte[1024]; int len = -1; while ((len = bis.read...); IOUtils.closeQuietly(fOut); IOUtils.closeQuietly(bis); } }

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【File操作】Java实现导出ZIP压缩包

import org.apache.commons.io.FileUtils; import org.apache.commons.io.IOUtils; import javax.servlet.http.HttpServletResponse...f.getName()); } } else { //当前的是文件，打包处理 //文件输入流 BufferedInputStream...bis = new BufferedInputStream(new FileInputStream(file)); ZipEntry entry = new ZipEntry(...(zip); return outputStream.toByteArray(); } public static void exportZip(HttpServletResponse...data.length); response.setContentType("application/octet-stream;charset=UTF-8"); IOUtils.write

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Java程序员的日常—— IOUtils总结

read 从一个流中读取内容 read(inputstream,byte[]) read(inputstream,byte[],offset,length) //offset是buffer的偏移值，length...是读取的长度 read(reader,char[]) read(reader,char[],offset,length) 这里我写了个小例子，可以测试read方法的效果： @Test public...("hello world"); IOUtils.read(is, bytes); System.out.println(new String(bytes...IOUtils.read(is, bytes, 2, 4); System.out.println(new String(bytes)); } catch (IOException...Reader input, String encoding) toByteArray(String input) toByteArray(URI uri) toByteArray(URL url) toByteArray

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将整个工程的GBK转为utf-8格式

将整个工程转为utf-8时原先中文注释会变为乱码，13年时写了个脚本将整个文件的java以及配置文件转为utf-8格式，下面是代码 package com.code.pd; import java.io.BufferedInputStream...; import java.io.OutputStreamWriter; import java.nio.charset.Charset; import org.apache.commons.io.IOUtils...bin = new BufferedInputStream( new FileInputStream(fileName)); int p = (bin.read() read..."; break; case 0xfeff: code = "UTF-16BE"; break; default: code = "GBK"; } IOUtils.closeQuietly...Charset.forName(charsetName)); int size = (int) (file.length()); char[] chs = new char[size]; inRead.read

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java文件分片和合并

com.jinw.exception.ServiceException; import lombok.extern.slf4j.Slf4j; import org.apache.commons.io.IOUtils...// 子文件下标 int filenameExt = FILE_NAME_EXT; while ((length = bis.read...bis = new BufferedInputStream(new FileInputStream(sliceDir + subFilename))) { //...= new byte[DEFAULT_SIZE]; int length; while ((length = bis.read...删除分片文件成功..."); } } } } finally { IOUtils.closeQuietly

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controller下载单个文件

HttpServletResponse response, String attachmentFileName, File file) { FileInputStream fis = null; BufferedInputStream...response.getOutputStream(); fis = new FileInputStream(file); bis = new BufferedInputStream...(fis); byte[] buffer = new byte[bis.available()]; int i = bis.read(buffer...= -1){ os.write(buffer, 0, i); i = bis.read(buffer);...(bis); IOUtils.closeQuietly(fis); IOUtils.closeQuietly(os); } } /*

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spring boot 下载excel文件提示“文件中部分内容有问题。是否让我们尽量尝试恢复

(); byte[] buffer = new byte[1024]; int i = bis.read(buffer); while...缓冲流，每次读取1024 byte[] buff = new byte[1024]; int readLength = 0; while (( readLength = bis.read...] buff = new byte[1024]; // int readLength = 0; // while (( readLength = bis.read...); } } catch ( IOException e ) { log.error("文件下载失败,e"); } finally { IOUtils.closeQuietly...(outputStream); IOUtils.closeQuietly(inputStream); IOUtils.closeQuietly(bis); } }

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java 文件处理工具类

package com.fh.util; import java.io.BufferedInputStream; import java.io.ByteArrayOutputStream; import...* 读取到字节数组1 * * @param filePath * @return * @throws IOException */ public static byte[] toByteArray...FileNotFoundException(filePath); } ByteArrayOutputStream bos = new ByteArrayOutputStream((int) f.length()); BufferedInputStream...in = null; try { in = new BufferedInputStream(new FileInputStream(f)); int buf_size = 1024;...= (len = in.read(buffer, 0, buf_size))) { bos.write(buffer, 0, len); } return bos.toByteArray

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其他流---字节数组流与文件流对接

将流转换到数组中 public static byte[] getBytesFromFile(String src) throws IOException { InputStream is = new BufferedInputStream...= (len = is.read(flush))) { bos.write(flush, 0, len); } bos.flush(); dest = bos.toByteArray(...= (len = is.read(flush))) { os.write(flush, 0, len); } os.flush(); os.close(); is.close();...= (len = is.read(flush))) { os.write(flush, 0, len); } os.flush(); os.close(); is.close();...= (len = is.read(flush))) { bos.write(flush, 0, len); } bos.flush(); dest = bos.toByteArray(

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如何将文件流转换成byte[]数组

outputStream = new ByteArrayOutputStream(); byte[] bytes = new byte[1024]; int temp; while ((temp = is.read...= -1) { outputStream.write(bytes, 0, temp); } //转换后的byte[] byte[] finalBytes = outputStream.toByteArray...(); 二、通过IOUtils ObsObject obsObject = obsClient.getObject(bucketName, objectName); InputStream...inputStream = obsObject.getObjectContent(); byte[] bytes = null; try { bytes = IOUtils.toByteArray...OutputStream bos = response.getOutputStream(); int len; while ((len = input.read

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IO工具包最基本的工具包，难道你还不会用？

, String encoding) IOUtils.toString(URL url, String encoding) // 将输入流转换成字符数组 IOUtils.toByteArray(InputStream...input) IOUtils.toByteArray(InputStream input, int size) IOUtils.toByteArray(URI uri) IOUtils.toByteArray...(URL url) IOUtils.toByteArray(URLConnection urlConn) IOUtils.toByteArray(Reader input, String encoding...> lines, String lineEnding, OutputStream output, String encoding) // 从一个流中读取内容 IOUtils.read(InputStream...input, byte[] buffer) IOUtils.read(InputStream input, byte[] buffer, int offset, int length) IOUtils.read

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java判断文本文件编码格式

文件编码格式 * @throws Exception */ public static String codeString(File fileName) throws Exception{ BufferedInputStream...bin = new BufferedInputStream( new FileInputStream(fileName)); int p = (bin.read() read..."; break; case 0xfeff: code = "UTF-16BE"; break; default: code = "GBK"; } IOUtils.closeQuietly

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其他流---字节流数组

字节流数组读入建立字节流读取，参数为字节数组读入流 InputStream bi = new BufferedInputStream(new ByteArrayInputStream(c)); 建立读取字节数组...= (len = bi.read(flush))) { s += new String(flush, 0, len); } System.out.println(s); 关闭流(可选) bi.close...ByteArrayOutputStream(); 写入流 os.write(c, 0, c.length); 缓冲区中的内容赋值给dest，返回dest byte[] dest; dest = os.toByteArray...(write()); } public static void read(byte[] c) throws IOException { InputStream bi = new BufferedInputStream...ByteArrayOutputStream os = new ByteArrayOutputStream(); os.write(c, 0, c.length); byte[] dest; dest = os.toByteArray

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通过http URL 获取图片流转为字节数组

byte[] buffer = new byte[2048]; int len = 0; while( (len=inStream.read...buffer, 0, len); } inStream.close(); byte[] data = outStream.toByteArray...@throws IOException */ private byte[] getImage(String url) throws IOException{ BufferedInputStream...byte[] temp = new byte[2048]; int size = 0; while ((size = in.read...out.write(temp, 0, size); } in.close(); byte[] content = out.toByteArray

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SpringBoot访问windows共享文件

buf = new BufferedInputStream(new SmbFileInputStream(smbFile)); FileUtil.writeFile(localFilePath...com.hierynomus.smbj.share.File file = diskShare.openFile(filePath, EnumSet.of(AccessMask.GENERIC_READ...localFilePath); byte[] b = new byte[4096]; int length; while ((length = fis.read...} } catch (IOException e) { throw e; } finally { IOUtils.close...(os); IOUtils.close(fis); if (diskShare !

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java分片上传和下载文件1

删除失败"); int offset = 0; // 分片偏移量 int chunkSize = 1024 * 1024 * 1; // 每个分片的大小 BufferedInputStream...--more--> try { bis = new BufferedInputStream(new FileInputStream(file));...length; // 子文件下标 String uploadUrl = null; while ((length = bis.read...} catch (IOException e) { e.printStackTrace(); } finally { IOUtils.closeQuietly...offset + "/" + totalSize + " bytes " + "/" + downloadUrl); } } finally { IOUtils.closeQuietly

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javaIO流

-1，否则返回读入的字节一次读一个字节效率很低(每读一次就会进行一次磁盘io)，inputStream重载了read方法，可以一次读一个字节数组，源码如下: public int read(byte...b[]) throws IOException { return read(b, 0, b.length); } public int read(byte b[], int off, int len...(byte[])也是通过循环调用read来实现一次读入一个字节数组，因此本质上来说这个方法也没有使用内存缓存区。...byte[1024]; //代表一次最多读取1KB的内容 int length = 0 ; //代表实际读取的字节数 while( (length = bufferedInputStream.read...(file)); List newStringList = (List)objectInputStream.readObject(); IOUtils.close

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HDFS——如何将文件复制到HDFS

基本的文件操作有open、read、write和close。实际上，Hadoop的文件API是通用的，可用于HDFS以外的文件系统。...import java.net.URI; import java.io.InputStream; import java.io.OutputStream; import java.io.BufferedInputStream...org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IOUtils...target>"); System.exit(2); } Configuration conf = new Configuration(); InputStream input = new BufferedInputStream...= FileSystem.get(URI.create(args[1]),conf); OutputStream output = fs.create(new Path(args[1])); IOUtils.copyBytes

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Java中的IO流（三）Apache Commons IO组件的常用操作

read 从一个流中读取内容 read(inputstream,byte[]) .......比较两个流，忽略换行符 lineIterator 读取流，返回迭代器 toBufferedInputStream 把流的全部内容放在另一个流中 toBufferedReader 返回输入流 toByteArray...in ) ); } finally { IOUtils.closeQuietly(in); } List list = IOUtils.readLines(in, "UTF-8...byte数组 byte[] bytes = IOUtils.toByteArray(in); Ⅱ内容写入流 //把数据写入输出流 char [] ch = new char[]{'a','a','b'}...; byte [] by = "aaaa".getBytes(); IOUtils.write("abc", outputStream); IOUtils.write(ch, outputStream

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技术汇总：第一章：使用poi实现表单下载成xls文件并打印

IOException e) { e.printStackTrace(); } byte[] content = os.toByteArray...(), "iso-8859-1")); ServletOutputStream out = response.getOutputStream(); BufferedInputStream...= null; BufferedOutputStream bos = null; try { bis = new BufferedInputStream...byte[] buff = new byte[2048]; int bytesRead; // Simple read...= (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead);

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PGP加解密

【File操作】Java实现导出ZIP压缩包

Java程序员的日常—— IOUtils总结

将整个工程的GBK转为utf-8格式

java文件分片和合并

controller下载单个文件

spring boot 下载excel文件提示“文件中部分内容有问题。是否让我们尽量尝试恢复

java 文件处理工具类

其他流---字节数组流与文件流对接

如何将文件流转换成byte[]数组

IO工具包最基本的工具包，难道你还不会用？

java判断文本文件编码格式

其他流---字节流数组

通过http URL 获取图片流转为字节数组

SpringBoot访问windows共享文件

java分片上传和下载文件1

javaIO流

HDFS——如何将文件复制到HDFS

Java中的IO流（三）Apache Commons IO组件的常用操作

技术汇总：第一章：使用poi实现表单下载成xls文件并打印

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