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  • java_io字节流操作

    看代码:

    package wkl.file;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.FileWriter;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.io.Writer;
    
    import javax.imageio.stream.FileImageInputStream;
    
    /**
     * 字节流的输入流和输出流基础是InputStream和OutputStream这两个抽象类,字节流的输入输出操作由这两个类的子类实现。
     * @author Administrator
     *
     */
    public class InoutStreamTest {
        //字节流:向文中写入字符串
        public static void write22() throws Exception{
            File file = new File("G:\xxx\fd.txt");
            OutputStream out = new FileOutputStream(file);
            String string = "你好吗000990";
            byte[] b = string.getBytes();//把字符串转换成字节数组
            out.write(b);    //会把原来文件的内容先清除再写入,追加在后面讲
            /*for(int i=0;i<b.length;i++){
                out.write(b[i]);
            }*/
            out.close();
        } 
        
        //向文件中追加新内容
        public static void append() throws Exception{
            File file = new File("G:\xxx\fd.txt");
            OutputStream out = new FileOutputStream(file,true); //追加格式
            String str = "2015你好";
            byte[] b = str.getBytes();
            out.write(b);
            out.close();
        }
        
        //读文件的内容
        public static void reads() throws Exception{
            File file = new File("G:\xxx\fd.txt");
            InputStream in =new FileInputStream(file);
            int len =0;
            byte [] b = new byte[1024] ;
            while((len=in.read(b))!=-1){
                System.out.println(new String(b));//可以正常输出中文
            }
        }
        
        
        //字符流:写入数据
        public static void wri() throws Exception{
            File file = new File("G:\xxx\fd.txt");
            Writer writer = new FileWriter(file);
            String str = "我是字符流";
            writer.write(str);  //先清除原来的内容再写入新的内容
            writer.close();
        }
        
        public static void main(String args[]) throws Exception{
            //write22();
            //append();
            //reads();
            wri();
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/kailing-con/p/4202345.html
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