java中讲讲BufferedReader的用法，举例？-优快云博客

本文通过两个示例详细介绍了Java中BufferedReader类的基本使用方法。包括如何从文件读取字符串并输出到控制台，以及如何从StringReader读取内容进行处理。适合初学者学习Java IO操作。

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2.3 BufferedReader的用法
马克-to-win：BufferedReader和BufferedInputStream差不多，只不过一个处理字符，一个处理字节。buffer（缓存）什么的原理都是一样的。

例：2.3.
import java.io.*;
public class TestMark_to_win {
    public static void main(String args[]) throws Exception {
        /* from file to string then to "multiline string" then to console. */
        String s2, s3 = new String();
        /*Creates a new FileReader, given the name of the file to read from.BufferedReader(Reader in) Create a buffering character-input stream
that uses a default-sized input buffer.*/
        BufferedReader in = new BufferedReader(new FileReader("c:/4.txt"));
        /*readLine is a method from BufferedReader: Read a line of text.
Returns: A String containing the contents of the line, not including
any line-termination characters, or null if the end of the stream has
been reached */
        while ((s2 = in.readLine()) != null) {
            s3 += s2 + "\n";
        }
        System.out.println(s3);
        in.close();
    }
}

例：2.3.2

import java.io.*;
public class TestMark_to_win {
    public static void main(String args[]) throws Exception {
        // /////////////////////// from StringReader to file:
        String s = "你们" + "\n" + "他们我们" + "\n";
        String s1 = "";
        StringReader in2 = new StringReader(s);
        in2.reset();
        BufferedReader in4 = new BufferedReader(in2);
        while ((s1 = in4.readLine()) != null) {
            System.out.println("output" + s1);
        }
    }
}