字符流

上一节学会了按字节进行操作的–字符流操作方法，InputStream ，OutputStream。

本节学习专门用于字符的形式读取和写入数据的方法

Reader 字符输入流

Writer 字符输出流

 

package stream;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class Test_Reader_Writer {
    			//读取文件	public static void readfile(File f) {
    		try (FileReader fr = new FileReader(f))		{
    			char[] all = new char[(int)f.length()];			fr.read(all);			for(char b:all)				System.out.print(b);		}		catch(IOException e) {
    			e.printStackTrace();		}		}		//写文件	public static void writefile(File f) {
    		try(FileWriter fr = new FileWriter(f)){
    			String a = "today.";			char []s2c = a.toCharArray();			fr.write(s2c);		}		catch(IOException e) {
    			e.printStackTrace();		}	}				//加密文件	public static void encodeFile(File encodingFile, File encodedFile) {
    			if(encodingFile.length()==0)			return;		char[] encoding = new char[(int)encodingFile.length()];		char[] encoded = new char[(int)encodingFile.length()];				try{
     			FileReader fr = new FileReader(encodingFile);			fr.read(encoding);			fr.close();		}		catch(IOException e) {
    			e.printStackTrace();		}				//processing		System.out.print("未加密的内容:");		for(char b:encoding)			System.out.print(b);		System.out.println();				for(int i=0; i

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.Arrays;  public class Main {
          public static void main(String[] args) {
           // int eachSize = 100 * 1024;    // 100k       // File srcFile = new File("f:/testfile/0321.pptx");       // OperateFile.splitFile(srcFile, eachSize);      //  OperateFile.mergeFile(8,eachSize);                File f = new File("f:/testfile/file.txt");        Test_Reader_Writer.readfile(f);        Test_Reader_Writer.writefile(f);                File file_textConding = new File("f:/testfile/coding.txt");        File file_textConding_out = new File("f:/testfile/coded.txt");        Test_Reader_Writer.encodeFile(file_textConding, file_textConding_out);            }    }