字符输入输出流

public class Test03 {
    public static void main(String[] args) {
        //Test03.testFileReader("C:/Users/涛/Desktop/io/tt.txt");
        Test03.testFileWriter("hello!!!","C:/Users/涛/Desktop/io/tt5.txt");
        Test03.copyFile("C:/Users/涛/Desktop/io/tt.txt","C:/Users/涛/Desktop/io/cc/tt.txt");
    }

    
    public static void testFileReader(String inPath){
        try {
            FileReader fr = new FileReader(inPath);//创建字符输入流对象
            char[] chars = new char[1024];//创建临时存放数据的字符数组
            int len=0;//定义一个输出流的读取长度
            while ((len=fr.read(chars))!=-1){
                System.out.println(new String(chars,0,len));
            }
            fr.close();
        } catch (Exception e) {
            e.printStackTrace();
        }finally {

        }

    }

    
    public static void testFileWriter(String test,String outPath){
        try {
            FileWriter fw = new FileWriter(outPath);
            fw.write(test);//写到内存中
            fw.flush();//把内存的数据刷到硬盘
            fw.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    
    public static void copyFile(String inPath,String outPath){
        try {
            FileReader fr = new FileReader(inPath);
            FileWriter fw = new FileWriter(outPath);
            char[] chars = new char[1024];
            int len=0;
            while ((len=fr.read(chars))!=-1){//读取数据
                fw.write(chars,0,len);//写入数据到内存
            }
            fw.flush();//把内存的数据刷到硬盘
            fw.close();
            fr.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}