} } }

    Java IO与NIO对象序列化写入文件效力粗略斗劲

    添加时间:2013-6-16 点击量:

      粗略地测试了一下ionio之间对于对象序列化读入文件的效力,不过我nio的写法可能有失偏颇,首要我没找到通道对象读写的办法。代码如下:




     1 import java.io.ByteArrayOutputStream;
    
    2 import java.io.FileNotFoundException;
    3 import java.io.FileOutputStream;
    4 import java.io.IOException;
    5 import java.io.ObjectOutputStream;
    6 import java.nio.ByteBuffer;
    7 import java.nio.channels.FileChannel;
    8 import java.util.ArrayList;
    9 import java.util.HashMap;
    10 import java.util.List;
    11 import java.util.Map;
    12
    13
    14 public class OtoBtoF {
    15 public static void writeObject() {
    16 long s = System.currentTimeMillis();
    17 try {
    18
    19 List<Map<String,Object>> table=new ArrayList<Map<String,Object>>();
    20 forint i=0;i<1;i++){
    21 Map<String,Object> map = new HashMap<String,Object>();
    22 Double d1=Math.random();
    23 Double d2=Math.random();
    24 Double d3=Math.random();
    25 map.put(name, d1.toString());
    26 map.put(id, d2.toString());
    27 map.put(age, d3);
    28 table.add(map);
    29 }
    30
    31 ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    32 //BufferedOutputStream bo=new BufferedOutputStream(outStream);
    33 ObjectOutputStream objectOutputStream = new ObjectOutputStream(outStream);
    34
    35 objectOutputStream.writeObject(table);
    36 objectOutputStream.close();
    37 FileOutputStream fout=new FileOutputStream(test.txt);
    38 FileChannel cha=fout.getChannel();
    39 ByteBuffer bb=ByteBuffer.wrap(outStream.toByteArray());
    40 cha.write(bb);
    41
    42 outStream.close();
    43 System.out.println(successful+(System.currentTimeMillis()-s));
    44 } catch (FileNotFoundException e) {
    45 e.printStackTrace();
    46 } catch (IOException e) {
    47 e.printStackTrace();
    48 }
    49 }
    50
    51 public static void main(String[] args) {
    52 // TODO Auto-generated method stub
    53 OtoBtoF.writeObject();
    54 System.out.println();
    55 }
    56 }


    NIO



     1 import java.io.BufferedInputStream;
    
    2 import java.io.BufferedOutputStream;
    3 import java.io.FileInputStream;
    4 import java.io.FileNotFoundException;
    5 import java.io.FileOutputStream;
    6 import java.io.IOException;
    7 import java.io.ObjectInputStream;
    8 import java.io.ObjectOutputStream;
    9 import java.util.ArrayList;
    10 import java.util.HashMap;
    11 import java.util.List;
    12 import java.util.Map;
    13
    14
    15 public class OtoF {
    16 public static void writeObject() {
    17 try {
    18 long s = System.currentTimeMillis();
    19 List<Map<String,Object>> table=new ArrayList<Map<String,Object>>();
    20 forint i=0;i<1;i++){
    21 Map<String,Object> map = new HashMap<String,Object>();
    22 Double d1=Math.random();
    23 Double d2=Math.random();
    24 Double d3=Math.random();
    25 map.put(name, d1.toString());
    26 map.put(id, d2.toString());
    27 map.put(age, d3);
    28 table.add(map);
    29 }
    30
    31 FileOutputStream outStream = new FileOutputStream(test.txt);
    32 BufferedOutputStream bo=new BufferedOutputStream(outStream);
    33 ObjectOutputStream objectOutputStream = new ObjectOutputStream(bo);
    34
    35 objectOutputStream.writeObject(table);
    36 objectOutputStream.close();
    37 bo.close();
    38 outStream.close();
    39 System.out.println(successful+(System.currentTimeMillis()-s));
    40 } catch (FileNotFoundException e) {
    41 e.printStackTrace();
    42 } catch (IOException e) {
    43 e.printStackTrace();
    44 }
    45 }
    46
    47 public static void main(String[] args) {
    48 // TODO Auto-generated method stub
    49 OtoF.writeObject();
    50 System.out.println();
    51 }
    52 }


    IO

      经由过程调剂for轮回的次数来批改凑集的大小来测试,测试成果如下(名称后是均匀时候):





    时候读书,不要想着实用,更不要有功利心。读书只为了自身的修养。邂逅一本好书如同邂逅一位知己,邂逅一个完美之人。有时心生敬意,有时怦然心动。仿佛你心底埋藏多年的话,作者替你说了出来,你们在时光深处倾心相遇的一瞬间,情投意合,心旷神怡。
    分享到: