1.通过字符流实现文本文件的复制
/**
* 字符流处理文本文档复制
*/
public static void copyText(String srcPath,String descPath){
FileReader fr = null;
FileWriter fw = null;
try {
fr = new FileReader(new File(srcPath));
fw = new FileWriter(new File(descPath));
char[] chars = new char[15];
int len;
while ((len = fr.read(chars)) != -1) { //read()返回读取的字符个数 如果为-1，表示没有数据
fw.write(chars, 0, len);
}
System.out.println("复制成功");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(fr != null){
try {
fr.close();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(fw != null){
try {
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
/**
* 带有缓冲区的字符流处理文本文档复制
*/
public static void copyTextWithBuffer(String srcPath,String descPath){
BufferedReader br = null;
BufferedWriter bw = null;
try {
FileReader fr = new FileReader(new File(srcPath));
FileWriter fw = new FileWriter(new File(descPath));
br = new BufferedReader(fr);
bw = new BufferedWriter(fw);
char[] chars = new char[15];
int len;
while((len = br.read(chars)) != -1){
bw.write(chars,0,len);
}
System.out.println("复制成功");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(br != null){
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(bw != null){
try {
bw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
2.使用字节流对非文本文档进行复制操作
/*
字节流处理非文本文档
*/
public static void copyTxt(String srcPath,String descPath) {
long begin = System.currentTimeMillis();
FileInputStream ism = null;
FileOutputStream fos = null;
try {
ism = new FileInputStream(new File(srcPath));
fos = new FileOutputStream(new File(descPath));
byte[] bytes = new byte[15];
int len;
while ((len = ism.read(bytes))!= -1){
fos.write(bytes,0,len);
}
System.out.println("复制成功");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ism != null) {
try {
ism.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
long end = System.currentTimeMillis();
System.out.println("不带缓冲流的文件复制耗时："+(end-begin)+"ms");
}
/**
* 字节缓冲流实现非文本文档复制
*/
public static void copyTextWithBuffer(String srcPath,String descPath){
long begin = System.currentTimeMillis();
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
try {
InputStream is = new FileInputStream(new File(srcPath));
OutputStream os = new FileOutputStream(new File(descPath));
bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(os);
byte[] bytes = new byte[15];
int len;
while ((len = bis.read(bytes)) != -1){
bos.write(bytes,0,len);
}
System.out.println("复制成功");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(bis != null){
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}finally {
if(bos != null){
try {
bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
long end = System.currentTimeMillis();
System.out.println("带缓冲区的文档复制耗时为："+(end-begin)+"ms");
}
