WriteLine.java

/**
 * WriteLine.java
 *
 * Copyright 2012 Niolex, Inc.
 *
 * Niolex licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.apache.niolex.common.file;

import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * @author <a href="mailto:xiejiyun@gmail.com">Xie, Jiyun</a>
 * @version 1.0.0, $Date: 2012-12-24$
 */
public class WriteLine {

    /**
     * A方法追加文件：使用RandomAccessFile
     */
    public static void appendMethodA(String fileName, String content) {
        try {
            // 打开一个随机访问文件流，按读写方式
            RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");
            // 文件长度，字节数
            long fileLength = randomFile.length();
            //将写文件指针移到文件尾。
            randomFile.seek(fileLength);
            randomFile.writeBytes(content);
            randomFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * B方法追加文件：使用FileWriter
     */
    public static void appendMethodB(String fileName, String content) {
        try {
            //打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件
            FileWriter writer = new FileWriter(fileName, true);
            writer.write(content);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        String s = "D:\\home\\tmp\\" + System.nanoTime();
        long in, out;
        in = System.currentTimeMillis();
        for (int i = 0; i < 2000; ++ i) {
            appendMethodA(s, "This is good!\r\n");
        }
        out = System.currentTimeMillis();
        System.out.println("使用RandomAccessFile " + (out - in));
        in = System.currentTimeMillis();
        for (int i = 0; i < 2000; ++ i) {
            appendMethodB(s, "This is good!\r\n");
        }
        out = System.currentTimeMillis();
        System.out.println("使用FileWriter " + (out - in));
    }

}