1.Buffer 缓冲区 Buffer是用于存储数据的容器,在内存中占了一块连续的空间,本质上是一个数组,Java中针对基本类型提供了不同的的缓冲区(没有Boolean),ByteBuffer(字节缓冲区)是最基本的缓冲区。 ByteBuffer 继承了Buffer类,底层是靠字节数组来存储数据,是一个抽象类,需要用其子类创建对象,或者用提供的allocate/wrap...
int bufferSize = 1024; if (bufferSize > channel.size()) { bufferSize = (int) channel.size(); } ByteBuffer buff = ByteBuffer.allocate(bufferSize); channel.read(buff); buff.flip(); assertEquals(expected_value, new String(buff.array())); channel.close(); reader.close(); } 10. Reading...
importjava.io.File;importjava.io.FileInputStream;importjava.io.IOException;publicclassMain{publicstaticvoidmain(String[]args){File localFile=newFile("example.txt");FileInputStream fis=null;try{fis=newFileInputStream(localFile);// 在这里执行文件读取操作}catch(IOException e){e.printStackTrace();}f...
//使用 BufferedReader 在控制台读取字符importjava.io.*;publicclassBRReadLines{publicstaticvoidmain(Stringargs[])throwsIOException{//使用 System.in 创建 BufferedReaderBufferedReaderbr=newBufferedReader(newInputStreamReader(System.in));Stringstr;System.out.println("Enter lines of text.");System.out.print...
3) 一般用法: FileReader fr = new FileReader(“ming.txt”); char[] buffer = new char[1024]; int ch = 0; while((ch = fr.read())!=-1 ) { System.out.print((char)ch); } 4. InputStreamReader类 以文本格式输入/输出,可以指定编码格式; 主要方法: getEncoding(),read(); 一般用法: Inp...
String content= "hello java"; writeFile(path, content); readFile(path); }publicstaticvoidwriteFile(String path, String content)throwsIOException {//打开文件输出流FileOutputStream fos =newFileOutputStream(path);byte[] buffer =content.getBytes();//向文件中写入内容fos.write(buffer);//关闭流fos....
(BufferedInputStreamin=newBufferedInputStream(httpConn.getInputStream());FileOutputStreamfileOutputStream=newFileOutputStream(savePath)){bytedataBuffer[]=newbyte[1024];intbytesRead;while((bytesRead=in.read(dataBuffer,0,1024))!=-1){fileOutputStream.write(dataBuffer,0,bytesRead);}System.out.println(...
*For Fast read using the buffer array.*/bis=newBufferedInputStream(fis);/*available() method of BufferedInputStream * returns 0 when there are no more bytes * present in the file to be read*/while(bis.available()>0){System.out.print((char)bis.read());}}catch(FileNotFoundExceptionfnfe)...
outputStream.write(buffer,0,length); } outputStream.close(); inputStream.close(); System.out.println("特定文件已提取并保存成功!"); return;// 已找到目标文件并处理完毕,结束循环 } } System.out.println("无法找到指定文件!"); zipFile.close(); ...
4.支持# http请求聚合, 然后用 select * from id in (httpRequestList). 示例代码:com.github.netty.http.example.HttpGroupByApiController.java 5.支持# h2c (注: 不建议用h2,h2c当rpc, 原因在文档最底部有说明) 6.支持# 异步零拷贝。sendFile, mmap. ...