我正在尝试使用 apache.commons.codec jar 文件将从 URL 获得的图像文件转换为 Base64 字符串。
Java代码..
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import org.apache.commons.codec.binary.Base64;
public class HelloWorld {
public static void main(String args[]) {
String imageUrl = "http://www.avajava.com/images/avajavalogo.jpg";
String destinationFile = "image_1.jpg";
try {
// Reading a Image file from file system
URL url = new URL(imageUrl);
InputStream is = url.openStream();
BufferedInputStream imageInFile = new BufferedInputStream(url.openConnection().getInputStream());
byte imageData[] = new byte[2048];
imageInFile.read(imageData);
// Converting Image byte array into Base64 String
String imageDataString = encodeImage(imageData);
System.out.println("imageDataString : " + imageDataString);
System.out.println("Image Successfully Manipulated!");
} catch (FileNotFoundException e) {
System.out.println("Image not found" + e);
} catch (IOException ioe) {
System.out.println("Exception while reading the Image " + ioe);
}
}
public static String encodeImage(byte[] imageByteArray) {
return Base64.encodeBase64URLSafeString(imageByteArray);
}
}
每当我运行我的代码时，我都会收到以下错误
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method encodeBase64URLSafeString(byte[]) is undefined for the type Base64
at helloWorld.HelloWorld.encodeImage(HelloWorld.java:51)
at helloWorld.HelloWorld.main(HelloWorld.java:35)
即使在导入 Base64 类后，我也无法理解哪里出错了。请帮助..
编辑 1：
IDE 还为方法“encodeImage”提供以下错误
编辑2：
项目的Java构建路径
