我想将通过http访问的图片转成base64编码，从网上找了短代码：
public static String GetImageStr(String imgFilePath) {
byte[] data = null;
InputStream in = new FileInputStream(imgFilePath);
data = new byte[in.available()];
in.read(data);
in.close();
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);
}
但是需要传的参数必须的本地磁盘地址，而我需要传的是http地址读到图片，我把方法改为：
public static String GetImageStr(String imgFilePath) {
URL url = new URL("http://xxxxxx");
BufferedInputStream in = new BufferedInputStream(url.openStream());
byte[] data = null;
data = new byte[in.available()];
in.read(data);
in.close();
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);
}
但是修改后的方法，得到的“in.available()”的个数与实际的个数相差很多。大家知道是怎么回事吗？？
------解决方案--------------------
- Java code
package example;import java.io.BufferedInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.net.URI;import java.net.URLConnection;public class URIExample { public static void main(String[] args) { URI uri = null; URLConnection connection = null;// 获取URLConnection对象 BufferedInputStream in = null; ByteArrayOutputStream out = null; try { uri = new URI(IMAGE_URL);// 创建URI对象 connection = uri.toURL().openConnection(); in = new BufferedInputStream(connection.getInputStream()); out = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len; while ((len = in.read(buffer)) != -1) { out.write(buffer, 0, len); } byte[] data = out.toByteArray(); // 这里进行你想要的其他操作 } catch (Exception e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e) {} } if (out != null) { try { out.close(); } catch (IOException e) {} } } } static final String IMAGE_URL = "http://img.hb.aicdn.com/bd631af751b83488838dfb0f8a7a986956409bf0dbc4-itg5Hz_fw554";}