IO_BufferedReader&BufferedWriter

Posted 2020-12-02 changzuidaerguai

从字符输入流中读取文本，缓冲各个字符，从而实现字符、数组和行的高效读取。

public class BufferedReaderJava {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String sPath1 = "d:" + File.separator + "javatest" + File.separator + "CollectionTest1.java";
        BufferedReader r = new BufferedReader(new FileReader(new File(sPath1)));
        char[] ch = new char[1024];
        int result = 0;
        //确认流是否准备好
        if(r.ready()) {
            //读取数据
            while((result = r.read(ch)) != -1) {
                System.out.println(new String(ch, 0, result));
            }
        }
        
        r.close();
    }

}

使用readLine()方法每次读取一行

public class BufferedReaderJava {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String sPath1 = "d:" + File.separator + "javatest" + File.separator + "CollectionTest1.java";
        BufferedReader r = new BufferedReader(new FileReader(new File(sPath1)));
        String str = null;
        while((str = r.readLine()) != null) {
            System.out.println(str);
        }
        
        r.close();
    }

}

public class BufferedReaderJava {

    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        String sPath1 = "d:" + File.separator + "javatest" + File.separator + "CollectionTest1.java";
        BufferedReader r = new BufferedReader(new FileReader(new File(sPath1)));
        //String str = null;
        int result = 0;
        //这里输出的时候每行首字符丢失，因为先read()了一个字符，然后输出的时候接下来readLine()的部分
        while((result = r.read()) != -1) {
            System.out.println(r.readLine());
        }
        
        r.close();
    }

}