java：24G文件写入所要时间23.9分，读取只有67秒（1G内存测试)

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 1 package arrays.file;
 2 import java.io.BufferedReader;
 3 import java.io.BufferedWriter;
 4 import java.io.FileReader;
 5 import java.io.FileWriter;
 6 import java.io.IOException;
 7 public class WriteFile {
 8  public static void main(String[] args) {
 9   String path = "d:/data.txt";
10   writerFile(path);
11   readerFile(path);
12  }
13  // 写入文件
14  public static void writerFile(String path) {
15   try {
16    BufferedWriter bw = new BufferedWriter(new FileWriter(path));
17    // int max = Integer.MAX_VALUE;
18    int max = 1000;
19    System.out.println("总写入文件行数：" + max);
20    long start = System.currentTimeMillis();
21    for (int i = 0; i < max; i++) {
22     bw.write((int) (Math.random() * max) + "");
23     bw.newLine();
24    }
25    bw.close();
26    long end = System.currentTimeMillis();
27    System.out.println("写入耗时：" + (end - start) + "ms = "
28      + ((double) (end - start) / 1000) + "s");
29   } catch (IOException e) {
30    e.printStackTrace();
31   }
32  }
33  // 读取文件
34  public static void readerFile(String path) {
35   try {
36    BufferedReader br = new BufferedReader(new FileReader(path));
37    long start = System.currentTimeMillis();
38    while (br.ready()) {
39     br.readLine();
40    }
41    br.close();
42    long end = System.currentTimeMillis();
43    System.out.println("读取耗时：" + (end - start) + "ms = "
44      + ((double) (end - start) / 1000) + "s");
45   } catch (IOException e) {
46    e.printStackTrace();
47   }
48  }
49 }