转载（java向txt中写入字符串的几种方式以及效率）

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1.PrintWriter

  
  
try {
PrintWriter pw= new PrintWriter( "D://1.txt");
for( int i= 0;i< 500000;i++){
pw.write( "我是一颗自由小星星");
}
pw.flush();
pw.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

  
  

2.FileWriter

  
  
FileWriter writer;
try {
writer = new FileWriter( "D://1.txt", true);
for( int i= 0;i< 500000;i++){
writer.write( "我是一颗自由小星星");
}
writer.flush(); //刷新内存，将内存中的数据立刻写出。
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
  
  

3.FileOutputStream

  
  
String str="我是一颗自由小星星";
byte[] b = str.getBytes();
File file= new File( "D://1.txt");
try {
file.createNewFile();
FileOutputStream fos= new FileOutputStream(file);
for( int i= 0;i< 500000;i++){
fos.write(b);
}
fos.flush();
fos.close();


} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  
  

4.FileWriter和BufferedWriter1

            FileWriter fw;
  
  

            File file=new File("D://1.txt");
  
  

try {fw = new FileWriter(file);BufferedWriter bw = new BufferedWriter (fw);for(int i=0;i<count;i++){fw.write(“我是一颗自由小星星”);}fw.close(); fw.close(); } catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}
5.FileWriter和BufferedWriter2

                FileWriter fw;
  
  

                File file=new File("D://1.txt");
  
  

try {fw = new FileWriter(file);BufferedWriter bw = new BufferedWriter (fw);for(int i=0;i<500000;i++){bw.write(“我是一颗自由小星星”);}bw.flush();bw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}
6.PrintWriter和BufferedWriter3

  
  
PrintWriter fw;
try {
fw = new PrintWriter( "D://1.txt");
BufferedWriter bw = new BufferedWriter (fw);
for( int i= 0;i< 500000;i++){
bw.write( "我是一颗自由小星星");
}
bw.flush();
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  
  

7.PrintWriter和BufferedWriter4

  
  
PrintWriter fw;
try {
fw = new PrintWriter("D://1.txt");
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i <500000;i++){
fw.write("我是一颗自由小星星");
}
fw.flush();
fw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
  
  

8.OutputStreamWriter和BufferedWriter5

                OutputStreamWriter fw;
  
  

               File file=new File("D://1.txt");      
  
  

try {OutputStream outputstream =new FileOutputStream(file);fw = new OutputStreamWriter(outputstream);BufferedWriter bw = new BufferedWriter (fw);for(int i=0;i<count;i++){fw.write(“我是一颗自由小星星”);}fw.flush();fw.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}
执行效率对比

文件大小—15820KB


1—printWriter  time  383.0毫秒

2—fileWriter  time  394.0毫秒

3—fileOutputStream  time  4059.0毫秒

4—bufferedWriter1_FileWriter  time  258.0毫秒

5—bufferedWriter2_filewriter  time  167.0毫秒

6—bufferedWriter3_printwriter  time  178.0毫秒

7—bufferedWriter4_printwriter  time  176.0毫秒

8—bufferedWriter5_outputstreamwriter  time  269.0毫秒

文件大小—158203KB


1—printWriter  time  2383.0毫秒

2—fileWriter  time  2941.0毫秒

3—fileOutputStream  time  39663.0毫秒

4—bufferedWriter1_FileWriter  time  2374.0毫秒

5—bufferedWriter2_filewriter  time  1584.0毫秒

6—bufferedWriter3_printwriter  time  1913.0毫秒

7—bufferedWriter4_printwriter  time  1574.0毫秒

8—bufferedWriter5_outputstreamwriter  time  2500.0毫秒

文件大小—1582031KB

1—printWriter  time  22574.0毫秒

2—fileWriter  time  23056.0毫秒

3—bufferedWriter1_FileWriter  time  23106.0毫秒

4—bufferedWriter2_filewriter  time  16555.0毫秒

5—bufferedWriter3_printwriter  time  19872.0毫秒

6—bufferedWriter4_printwriter  time  17662.0毫秒

7—bufferedWriter5_outputstreamwriter  time  22536.0毫秒

文件大小—3515625KB

1—printWriter  time  51450.0毫秒

2—fileWriter  time  55853.0毫秒

3—bufferedWriter1_FileWriter  time  50722.0毫秒

4—bufferedWriter2_filewriter  time  35656.0毫秒

5—bufferedWriter3_printwriter  time  43913.0毫秒

6—bufferedWriter4_printwriter  time  37597.0毫秒

7—bufferedWriter5_outputstreamwriter  time  50935.0毫秒

文件大小—351562KB
1—bufferedWriter2_filewriter  time  4080.0毫秒

2—bufferedWriter3_printwriter  time  3855.0毫秒

3—bufferedWriter4_printwriter  time  3220.0毫秒

文件大小—351562KB
1—bufferedWriter2_filewriter  time  3809.0毫秒

2—bufferedWriter3_printwriter  time  3833.0毫秒

3—bufferedWriter4_printwriter  time  3176.0毫秒

文件大小—351562KB
1—bufferedWriter2_filewriter  time  3834.0毫秒

2—bufferedWriter3_printwriter  time  3878.0毫秒

3—bufferedWriter4_printwriter  time  3184.0毫秒

文件大小—351562KB
1—bufferedWriter2_filewriter  time  3969.0毫秒

2—bufferedWriter3_printwriter  time  3876.0毫秒

3—bufferedWriter4_printwriter  time  3315.0毫秒

文件大小—351562KB
1—bufferedWriter4_printwriter  time  4903.0毫秒

2—bufferedWriter2_filewriter  time  3035.0毫秒

3—bufferedWriter3_printwriter  time  3719.0毫秒

文件大小—351562KB
1—bufferedWriter3_printwriter  time  4003.0毫秒

2—bufferedWriter4_printwriter  time  4708.0毫秒

3—bufferedWriter2_filewriter  time  3871.0毫秒