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115 lines (103 loc) · 3.84 KB
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import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Pattern;
/**
* 图片与base64字符串的相互转换
* 注意：如果图片过大,转成字符串,无法转换完全,因为字符串有最大长度限制65534字节，
* 所以通过base64字符串传递图片时，我们需要限定图片文件的大小
* Created by 老肖 on 2019/8/28.
*/
public class Base64ImageUtil {
//本地图片转化成base64字符串
public static String convertLocalImageToBase64Str(String imgFile) {
// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
FileInputStream in = null;
byte[] data = null;
// 读取图片字节数组
try {
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
String base64Str = encoder.encode(data).replaceAll("\r|\n", "");
//LOGINFO.info("base64Str==>" + base64Str);
return base64Str;
}
// base64字符串转化成图片
public static boolean convertBase64StrToImage(String imgStr, String imgFilePath) {
if (imgStr == null || !isBase64(imgStr)) {
// 图像数据为空或者非有效的based4字符串
return false;
}
OutputStream out = null;
try {
BASE64Decoder decoder = new BASE64Decoder();
// Base64解码,对字节数组字符串进行Base64解码并生成图片
byte[] b = decoder.decodeBuffer(imgStr);
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {
// 调整异常数据
b[i] += 256;
}
}
File file = new File(imgFilePath);
if (!file.exists()) {
File parentFile = file.getParentFile();
if (!parentFile.exists()) {
parentFile.mkdirs();
}
file.createNewFile();
}
//新生成的图片
out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
return false;
}
return true;
}
//网络图片转换成base64字符串
public static String convertNetImageToBase64Str(String netImagePath) {
ByteArrayOutputStream data = new ByteArrayOutputStream();
InputStream is = null;
try {
// 创建URL
URL url = new URL(netImagePath);
byte[] by = new byte[1024];
// 创建链接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
is = conn.getInputStream();
// 将内容读取内存中
int len = -1;
while ((len = is.read(by)) != -1) {
data.write(by, 0, len);
}
is.close();
} catch (IOException e) {
e.printStackTrace();
return null;
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
String base64Str = encoder.encode(data.toByteArray()).replaceAll("\r|\n", "");
//LOGINFO.info("base64Str==>" + base64Str);
return base64Str;
}
public static boolean isBase64(String str) {
String base64Pattern = "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{4}|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)$";
return Pattern.matches(base64Pattern, str);
}
}