标签：out NPU void ati edr pac stream TE har
package 传智播客.day21_io.test;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
/**
*
* 复制文本文件
*
* 分析： 复制数据，如果我们知道用记事本打开并能够读懂，就用字符流，否则用字节流。 通过该原理，我们知道我们应该采用字符流更方便一些。
* 而字符流有5种方式，所以做这个题目我们有5种方式。推荐掌握第5种。 数据源： c:\\a.txt -- FileReader --
* BufferdReader 目的地： d:\\b.txt -- FileWriter -- BufferedWriter
*
*/
public class test7 { public static void main(String[] args) throws IOException { String srcString = "c:\\a.txt"; String distString = "d:\\b.txt"; // method1(srcString, distString); // method2(srcString, distString); // method3(srcString,distString); // method4(srcString,distString); method5(srcString, distString); }
// 字符 缓存（高效）流，一次读写一个字符串
private static void method5(String srcString, String distString) throws IOException { BufferedReader br = new BufferedReader(new FileReader(srcString)); BufferedWriter bw = new BufferedWriter(new FileWriter(distString)); String line = null; while ((line = br.readLine()) != null) { bw.write(line); bw.newLine(); bw.flush(); } bw.close(); br.close(); }
// 缓存（高效）字符流，一次读写一个字符数组
private static void method4(String srcString, String distString) throws IOException { BufferedReader br = new BufferedReader(new FileReader(srcString)); BufferedWriter bw = new BufferedWriter(new FileWriter(distString)); char[] chs = new char[1024]; int len = 0; while ((len = br.read(chs)) != -1) { bw.write(chs, 0, len); } bw.close(); br.close(); }
// 缓存（高效）字符流，一次读写一个字符
private static void method3(String srcString, String distString) throws IOException { BufferedReader br = new BufferedReader(new FileReader(srcString)); BufferedWriter bw = new BufferedWriter(new FileWriter(distString)); int ch = 0; while ((ch = br.read()) != -1) { bw.write(ch); } bw.close(); br.close(); }
// 基本字符流，一次读写一个字符数组
private static void method2(String srcString, String distString) throws IOException { FileReader fr = new FileReader(srcString); FileWriter fw = new FileWriter(distString); char[] chs = new char[1024]; int len = 0; // 注意，这里的read有参数字符数组 while ((len = fr.read(chs)) != -1) { fw.write(chs, 0, len); } fw.close(); fr.close(); }
// 基本字符流，一次读写一个字符
private static void method1(String srcString, String distString) throws IOException { FileReader fr = new FileReader(srcString); FileWriter fw = new FileWriter(distString); int ch = 0; while ((ch = fr.read()) != -1) { fw.write(ch); } fw.close(); fr.close(); }
}
标签：out NPU void ati edr pac stream TE har
原文地址：https://www.cnblogs.com/csslcww/p/9179330.html
