Go_VS_Java_文件按行读写速度

最新推荐文章于 2025-06-20 06:30:00 发布

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本文通过实际案例比较了Java与Go两种语言在处理大型文本文件时的性能表现，详细介绍了使用的运行环境及测试代码。

1：运行环境说明：

go：1.0.3 64位

jdk：1.7_u9 64位

操作系统：win7 64位，Thinkpad T410i，i3 M350，2.27GHz，双核4线程，8G内存

文本文件：UTF-8纯文本文件，以行为单位，文件大小2.6G

程序目标：以行为单位读取该文件，并将读取的行写入另一个新的文件内。

2：程序结果

java totalTime:96096毫秒 client模式
java totalTime:77595毫秒 server模式
go totalTime:75328毫秒
以上结果仅供参考...

3：测试代码

java代码

package function.filehelper;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class SingleFileMergeFilter3 {
	
	public String inFile = "D:/00/tk.txt";
	public String inEncode = "UTF-8";
	
	public String outFile = "D:/00/tk3.txt";
	public String outEncode = "UTF-8";
	
	private FileInputStream fis;
	private InputStreamReader isr;
	private BufferedReader bfr;
	
	private FileOutputStream fos;
	private OutputStreamWriter osw;
	private BufferedWriter bwo;
	
	public void dealByLine() throws Exception{
		this.fis = new FileInputStream(inFile);
		this.isr = new InputStreamReader(this.fis, inEncode);
		this.bfr = new BufferedReader(this.isr);
		
		this.fos = new FileOutputStream(outFile);
		this.osw = new OutputStreamWriter(this.fos, outEncode);
		this.bwo = new BufferedWriter(this.osw);
		
		long s = System.currentTimeMillis();
		String line = null;
		while((line = this.bfr.readLine()) != null){
			this.bwo.write(line + "\r\n");
		}
		
		this.bwo.flush();
		long e = System.currentTimeMillis();
		System.out.println("totalTime:" + (e - s));
		
		this.bfr.close();
		this.bwo.close();
	}
	
	public static void main(String[] args) throws Exception {
		new SingleFileMergeFilter3().dealByLine();
	}
}

Go代码

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
	"time"
)

func main() {
	var inFile = "D:/00/tk.txt"
	var outFile = "D:/00/tk2.txt"

	fi, _ := os.Open(inFile)
	defer fi.Close()

	fo, _ := os.Create(outFile)
	defer fo.Close()

	r := bufio.NewReader(fi)
	w := bufio.NewWriter(fo)

	var s = time.Now()
	var line string
	for {
		lineByte, _, er3 := r.ReadLine()
		if er3 != nil && er3 == io.EOF {
			break
		}

		line = string(lineByte)
		w.WriteString(line + "\r\n")
	}

	w.Flush()

	var e = time.Now()
	fmt.Println("totalTime:", e.Sub(s).Nanoseconds()/1000/1000)
}