importjava.io.File;publicclassReadFileSize{publicstaticvoidmain(String[]args){// Step 1: 打开文件Filefile=newFile("文件路径");try{// Step 2: 获取文件大小longfileSize=file.length();// 打印文件大小System.out.println("文件大小为: "+fileSize+" 字节");}catch(Exceptione){e.printStackTrace()...
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size()); } 2. 使用JDK1.7提供的NIO读取文件(适用于小文件)# Copypublic static void nioOfJDK7() { String fileName = "D:\\test.txt"; final String CHARSET_NAME = "UTF-8"; List<String> content = new ArrayList<>(0); try { content = Files.readAllLines(Paths.get(fileName), Charset....
FilegetParentFile() Returns the abstract pathname of this abstract pathname's parent, or null if this pathname does not name a parent directory. StringgetPath() Converts this abstract pathname into a pathname string. longgetTotalSpace() Returns the size of the partition named by this abstract pa...
File has 29061936 bytes File has 29061936 bytes 其实这两个方法时有区别的; File 的length()方法 是获取文件所占硬盘空间大小; FileInputStream的available()方法是还有多少字节可以读取. available()方法的说明如下: Returns an estimate of the number of remaining bytes that can be read (or skipped over)...
public class ReadBig { public static String fff = "C:\\mq\\read\\from.xml"; public static void main1(String[] args) throws Exception { final int BUFFER_SIZE = 0x300000;// 缓冲区大小为3M File f = new File(fff); /** *
long fileSize = channel.size(); MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize); for (int i = 0; i < fileSize; i += buffer.limit()) { buffer.position(i); // 处理buffer中的数据,例如逐行读取或者转换为字符串等 ...
The Graal team is pleased to announce the general availability of Oracle GraalVM for JDK 23. In addition to JDK 23 support, this release includes many enhancements to Native Image ahead-of-time compilation to tune a generated executable’s size, memory usage, and throughput. This release is al...
1、进程在用户空间调用库函数mmap,原型:void *mmap(void *start, sizet length, int prot, int flags, int fd, offt offset); 2、在当前进程的虚拟地址空间中,寻找一段空闲的满足要求的连续的虚拟地址 3、为此虚拟区分配一个vmareastruct结构,接着对这个结构的各个域进行了初始化 ...
int blockSize=1024*1024;// 每个块的大小(1 MB)byte[]buffer=newbyte[blockSize];int bytesRead;while(downloadedBytes<totalFileSize){int bytesToRead=Math.min(blockSize,totalFileSize-downloadedBytes);connection.setRequestProperty("Range","bytes="+downloadedBytes+"-"+(downloadedBytes+bytesToRead-1));In...