Java StringWriter

1 什么是Java StringWriter

Java StringWriter类是一个字符流，它从字符串缓冲区收集输出，该缓冲区可用于构造String。StringWriter类继承Writer类。

在StringWriter类中，未使用系统资源（如网络套接字和文件），因此不需要关闭StringWriter。

2 Java StringWriter的语法

public class StringWriter extends Writer  

3 Java StringWriter的方法

4 Java StringWriter的例子

让我们看一下使用BufferedReader从流中读取文件数据的StringWriter的简单示例。

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
import java.io.*;

/**
 *  Java StringWriter的例子
 */
import java.io.*;

public class Demo {

    public static void main(String[] args) throws IOException {
        char[] ary = new char[512];
        StringWriter writer = new StringWriter();
        FileInputStream input = null;
        BufferedReader buffer = null;
        input = new FileInputStream("D:\\yiidian\\test.txt");
        buffer = new BufferedReader(new InputStreamReader(input, "UTF-8"));
        int x;
        while ((x = buffer.read(ary)) != -1) {
            writer.write(ary, 0, x);
        }
        System.out.println(writer.toString());
        writer.close();
        buffer.close();
    }
}

test.txt：

Yiidian provides tutorial in Java, Spring, Hibernate, Android, PHP etc.

输出结果为：

Yiidian provides tutorial in Java, Spring, Hibernate, Android, PHP etc.