package com.yellowcong.voice.utils;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Base64;
public class Base64Utils {
private static Base64Utils utils = null;
private Base64Utils(){
}
public static Base64Utils getInstance(){
if(utils == null){
synchronized (Base64Utils.class) {
if(utils == null ){
utils = new Base64Utils();
}
}
}
return utils;
}
public int getFileSize(File inFile){
InputStream in = null;
try {
in = new FileInputStream(inFile);
//文件长度
int len = in.available();
return len;
}catch (Exception e) {
// TODO: handle exception
}finally{
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return -1;
}
public String file2Base64(File inFile){
//将文件转化为字节码
byte [] bytes = copyFile2Byte(inFile);
if(bytes == null){
return null;
}
//base64,将字节码转化为base64的字符串
String result = Base64.getEncoder().encodeToString(bytes);
return result;
}
private byte [] copyFile2Byte(File inFile){
InputStream in = null;
try {
in = new FileInputStream(inFile);
//文件长度
int len = in.available();
//定义数组
byte [] bytes = new byte[len];
//读取到数组里面
in.read(bytes);
return bytes;
} catch (Exception e) {
e.printStackTrace();
return null;
}finally{
try {
if(in != null){
in.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public boolean base64ToFile(String strBase64,File outFile){
try {
// 解码，然后将字节转换为文件
byte[] bytes = Base64.getDecoder().decode(strBase64); // 将字符串转换为byte数组
return copyByte2File(bytes,outFile);
} catch (Exception ioe) {
ioe.printStackTrace();
return false;
}
}
private boolean copyByte2File(byte [] bytes,File file){
FileOutputStream out = null;
try {
//转化为输入流
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
//写出文件
byte[] buffer = new byte[1024];
out = new FileOutputStream(file);
//写文件
int len = 0;
while ((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len); // 文件写操作
}
return true;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
if(out != null){
out.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return false;
}
}
