FileReader&FileWriter
//FileReader文件读取流：把文件TestFileReader.java里的字符读取出来import java.io.*;public class TestFileReader {public static void main(String[] args) {FileReader fr = null; int c = 0;try {fr = new FileReader("F:/javashipin/TestFileReader.java");int ln = 0;while ((c = fr.read()) != -1) {//char ch = (char) fr.read();System.out.print((char)c);//if (++ln >= 100) { System.out.println(); ln = 0;}}fr.close();} catch (FileNotFoundException e) {System.out.println("找不到指定文件");} catch (IOException e) {System.out.println("文件读取错误");}}}==============================================================//FileWriter文件写入流：把数据(for循环里的数据）写入到文件(test.txt)中,里面显示的是国际上任何语言的组合，看到只是一堆乱码,不过可以转换成字符串的类型就不会了import java.io.*;public class TestFileWriter {public static void main(String[] args) {FileWriter fw = null;String s;try {fw = new FileWriter("F:/javashipin/test.txt");for(int c=0;c<=50000;c++){s = String.valueOf(c);fw.write(s);//fw.write(c);}fw.close();} catch (IOException e1) {e1.printStackTrace();System.out.println("文件写入错误");System.exit(-1);}}}/*====================================================================================================*///从FileReader文件读取流中读取的数据写入到FileWriter文件写入流中，test.txt不会产生上面的一堆乱码情况/*import java.io.*;public class TestFileWriter {public static void main(String[] args) throws Exception {FileReader fr = new FileReader("F:/javashipin/TestFileWriter.java");FileWriter fw = new FileWriter("F:/javashipin/test.txt");int b;//作为整数读取的字符b=fr.read()，范围在 0 到 65535 之间 (0x00-0xffff)，如果已到达流的末尾，则返回 -1while((b = fr.read()) != -1) { fw.write(b);}fr.close();fw.close();}}*/
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