byte配列とファイル間の相互変換、string回転ファイルストリーム出力
3216 ワード
/**
* byte ,
* @param bfile
* @param filePath
* @param fileName
*/
public static void byte2File(byte[] byte,String filePath,String fileName){
BufferedOutputStream bos=null;
FileOutputStream fos=null;
File file=null;
try{
File dir=new File(filePath);
if(!dir.exists() && !dir.isDirectory()){//
dir.mkdirs();
}
file=new File(filePath+fileName);
fos=new FileOutputStream(file);
bos=new BufferedOutputStream(fos);
bos.write(byte);
}
catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
}
finally{
try{
if(bos != null){
bos.close();
}
if(fos != null){
fos.close();
}
}
catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
/**
* byte
* @param filePath
* @return
*/
public static byte[] file2Byte(String filePath){
ByteArrayOutputStream bos=null;
BufferedInputStream in=null;
try{
File file=new File(filePath);
if(!file.exists()){
throw new FileNotFoundException("file not exists");
}
bos=new ByteArrayOutputStream((int)file.length());
in=new BufferedInputStream(new FileInputStream(file));
int buf_size=1024;
byte[] buffer=new byte[buf_size];
int len=0;
while(-1 != (len=in.read(buffer,0,buf_size))){
bos.write(buffer,0,len);
}
return bos.toByteArray();
}
catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
return null;
}
finally{
try{
if(in!=null){
in.close();
}
if(bos!=null){
bos.close();
}
}
catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
//
public static byte[] toByteArray(String hexString) {
hexString = hexString.toLowerCase();
final byte[] byteArray = new byte[hexString.length() / 2];
int k = 0;
for (int i = 0; i < byteArray.length; i++) {// 16 , 4 , 16 ,
byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
byteArray[i] = (byte) (high << 4 | low);
k += 2;
}
return byteArray;
}
/**
*
*
*/
public void file(HttpServletResponse response,String xx){
byte[] bytes = CommonUtil.toByteArray(xx);
OutputStream os = null;
try {
os = response.getOutputStream();
response.addHeader("Content-Type", "image/jpeg");
os.write(bytes);
os.flush();
}catch (Exception e){
e.printStackTrace();
}finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}