byte转inputStream及互相转化和各种的文件转化字符串转图片byte转字符串各种的方法
1、将File、FileInputStream 转换为byte数组：
File file = new File("file.txt");
InputStream input = new FileInputStream(file);
byte[] byt = new byte[input.available()];
input.read(byt);
2、将byte数组转换为InputStream：
byte[] byt = new byte[1024];
InputStream input = new ByteArrayInputStream(byt);
3、将byte数组转换为File：
File file = new File('');
OutputStream output = new FileOutputStream(file);
BufferedOutputStream bufferedOutput = new BufferedOutputStream(output);
bufferedOutput.write(byt);
将文件转成base64 字符串
public static String encodeBase64File(String path) throws Exception {
File file = new File(path);;
FileInputStream inputFile = new FileInputStream(file);
byte[] buffer = new byte[(int) file.length()];
inputFile.read(buffer);
inputFile.close();
return new BASE64Encoder().encode(buffer);
}
将base64字符解码保存文件
public static void decoderBase64File(String base64Code, String targetPath)
throws Exception {
byte[] buffer = new BASE64Decoder().decodeBuffer(base64Code);
FileOutputStream out = new FileOutputStream(targetPath);
out.write(buffer);
out.close();
}
将base64字符保存文本文件
public static void toFile(String base64Code, String targetPath)
throws Exception {
byte[] buffer = base64Code.getBytes();
FileOutputStream out = new FileOutputStream(targetPath);
out.write(buffer);
out.close();
}
public static void main(String[] args) {
try {
String base64Code = encodeBase64File("D:/0101-2011-qqqq.tif");
System.out.println(base64Code);
decoderBase64File(base64Code, "D:/2.tif");
toFile(base64Code, "D:\\three.txt");
} catch (Exception e) {
e.printStackTrace();
}
}
Base64字符串转图片
public static BufferedImage base64ToImage(String base64Str)throws Exception{
byte[] bytes = Base64Utils.base64ToBytes(BaseUtils.replaceBlank(base64Str));
InputStream inputStream = new ByteArrayInputStream(bytes);
BufferedImage image = ImageIO.read(inputStream);
inputStream.close();
return image;
}
Base64字符串转图片
public static OutputStream base64ToStream(String base64Str,OutputStream outputStream) throws Exception{
byte[] bytes = Base64Utils.base64ToBytes(BaseUtils.replaceBlank(base64Str));
outputStream.write(bytes);
return outputStream;
}
Base64字符串转图片
public static byte[] base64ToBytes(String base64Str) throws Exception{
if(StringUtils.isEmpty(base64Str)){
throw new IllegalArgumentException("Base64字符串不能为空");
}
BASE64Decoder decoder = new BASE64Decoder();
//Base64解码
byte[] b = decoder.decodeBuffer(BaseUtils.replaceBlank(base64Str));
return b;
}
输入流转byte[]再转Base64字符串
public static String stream2Base64(InputStream inputStream)throws Exception{
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int count = -1;
while ((count = inputStream.read(data, 0, 1024)) != -1)
outStream.write(data, 0, count);
data = null;
byte[] a = outStream.toByteArray();
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(a);// 返回Base64编码过的字节数组字符串
}
输入流转Base64字符串
public static String streamToBase64(InputStream inputStream)throws Exception{
byte[] data = new byte[inputStream.available()];
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);// 返回Base64编码过的字节数组字符串
}
Base64转文件
public static void toFile(String base64,String filePath) throws IOException{
byte[] decodeBuffer = new BASE64Decoder().decodeBuffer(BaseUtils.replaceBlank(base64));
FileOutputStream out = new FileOutputStream(filePath);
out.write(decodeBuffer);
out.flush();
out.close();
}
文件转Base64
public static String toBase64(File file) throws IOException{
FileInputStream inputFile = new FileInputStream(file);
byte[] buffer = new byte[(int) file.length()];
inputFile.read(buffer);
inputFile.close();
String base64 = new BASE64Encoder().encode(buffer);
return base64;
}