java 向txt中写入字符串的几种方式效率测试代码

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.Writer;

public class Test3 {
//        0.065秒  50000个"我是一颗自由小星星"写入到txt中，879KB
public void printWriter(String str,String filepath,int count){
try {
PrintWriter pw=new PrintWriter(filepath);
for(int i=0;i<count;i++){
pw.write(str);
}
pw.flush();
pw.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

//      0.127秒  50000个"我是一颗自由小星星"写入到txt中，879KB
public void  fileWrite(String str,String filepath,int count){

FileWriter writer;
try {
writer = new FileWriter(filepath,true);
for(int i=0;i<count;i++){
writer.write(str);
}
writer.flush();//刷新内存，将内存中的数据立刻写出。
writer.close();
} catch (IOException e) {
e.printStackTrace();
}

}

//     0.237秒  50000个"我是一颗自由小星星"写入到txt中，879KB
public void fileOutputStream(String str,File file,int count){
byte[] b = str.getBytes();
try {
FileOutputStream  fos=new FileOutputStream(file);
for(int i=0;i<count;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();
}

}

//    0.150秒   50000个"我是一颗自由小星星"写入到txt中，879KB
public void bufferedWriter1(String str,File file,int count){
FileWriter fw;
try {
fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i<count;i++){
fw.write(str);
}
fw.close();
fw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

//    0.172秒    50000个"我是一颗自由小星星"写入到txt中，879KB
public void bufferedWriter2(String str,File file,int count){
FileWriter fw;
try {
fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i<count;i++){
bw.write(str);
}
bw.flush();
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void bufferedWriter3(String str,File file,int count){
PrintWriter fw;
try {
fw = new PrintWriter(file);
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i<count;i++){
bw.write(str);
}
bw.flush();
bw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void bufferedWriter4(String str,File file,int count){
PrintWriter fw;
try {
fw = new PrintWriter(file);
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i<count;i++){
fw.write(str);
}
fw.flush();
fw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void bufferedWriter5(String str,File file,int count){
OutputStreamWriter fw;

try {
OutputStream outputstream =new FileOutputStream(file);
fw = new OutputStreamWriter(outputstream);
BufferedWriter bw = new BufferedWriter (fw);
for(int i=0;i<count;i++){
fw.write(str);
}
fw.flush();
fw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public static void main(String[] args) {
Test3  test=new Test3();
int count=20000000;
int x=1;
String filepath="D://1.txt";
File file=new File(filepath);

try {

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

long time1 ;
long time2 ;
double time3;

time1 = System.currentTimeMillis();

test.printWriter("我是一颗自由小星星", filepath,count);
time2 =System.currentTimeMillis();
time3=time2-time1;
System.out.println("文件大小---"+file.length()/1024+"KB");
System.out.println();

System.out.println(x+"---printWriter  time  "+time3+"毫秒");
//System.out.println("文件大小---"+file.length()/1024+"KB");
x++;
System.out.println(file.delete());

time1 = System.currentTimeMillis();

test.fileWrite("我是一颗自由小星星", filepath,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
System.out.println(x+"---fileWriter  time  "+time3+"毫秒");
//System.out.println("文件大小---"+file.length()/1024+"KB");
x++;
System.out.println(file.delete());

time1 = System.currentTimeMillis();

test.fileOutputStream("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
System.out.println(x+"---fileOutputStream  time  "+time3+"毫秒");
//System.out.println("文件大小---"+file.length()/1024+"KB");
x++;
System.out.println(file.delete());

time1 = System.currentTimeMillis();

test.bufferedWriter1("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
System.out.println(x+"---bufferedWriter1_FileWriter  time  "+time3+"毫秒");
//System.out.println("文件大小---"+file.length()/1024+"KB");
x++;
System.out.println(file.delete());

time1 = System.currentTimeMillis();
test.bufferedWriter3("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
System.out.println("文件大小---"+file.length()/1024+"KB");
System.out.println(x+"---bufferedWriter3_printwriter  time  "+time3+"毫秒");

System.out.println(file.delete());
x++;

time1 = System.currentTimeMillis();
test.bufferedWriter4("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
//System.out.println("文件大小---"+file.length()/1024+"KB");
System.out.println(x+"---bufferedWriter4_printwriter  time  "+time3+"毫秒");

System.out.println(file.delete());
x++;

time1 = System.currentTimeMillis();
test.bufferedWriter2("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
//System.out.println("文件大小---"+file.length()/1024+"KB");
System.out.println(x+"---bufferedWriter2_filewriter  time  "+time3+"毫秒");

System.out.println(file.delete());
x++;

time1 = System.currentTimeMillis();
test.bufferedWriter5("我是一颗自由小星星", file,count);
time2 =System.currentTimeMillis();

time3=time2-time1;
System.out.println(x+"---bufferedWriter5_outputstreamwriter  time  "+time3+"毫秒");
//System.out.println("文件大小---"+file.length()/1024+"KB");
System.out.println(file.delete());

}

}