java将图片输出base64位码显示

/**
* 网络图片转换Base64的方法
*
* @param netImagePath     
*/
public static String NetImageToBase64(String netImagePath) {
final ByteArrayOutputStream data = new ByteArrayOutputStream();
String strNetImageToBase64 = null;
try {
// 创建URL
URL url = new URL(netImagePath);
final byte[] by = new byte[1024];
// 创建链接
final HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() != HttpURLConnection.HTTP_OK) {
return strNetImageToBase64;
//连接失败/链接失效/图片不存在
} Thread thread =new Thread(new Runnable() {
@Override
public void run() {
try {
InputStream 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);
}
// 关闭流
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
thread.start();
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
strNetImageToBase64 = encoder.encode(data.toByteArray());
// 删除 \r\n
strNetImageToBase64 = strNetImageToBase64.replaceAll("\n", "").replaceAll("\r", "");
strNetImageToBase64 = "data:image/jpeg;base64," + strNetImageToBase64; } catch (IOException e) {
e.printStackTrace();
}
return strNetImageToBase64;
}

/**
* 转换为base64格式
*
* @param image
* @return
*/
public static String encode2Base64Jpg(BufferedImage image) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();// io流
try {
ImageIO.write(image, "jpg", baos);
} catch (IOException e) {
e.printStackTrace();
}
byte[] bytes = baos.toByteArray();// 转换成字节
Base64.Encoder encoder = Base64.getEncoder();
String jpgBase64 = encoder.encodeToString(bytes).trim();// 转换成base64串
jpgBase64 = jpgBase64.replaceAll("\n", "").replaceAll("\r", "");// 删除 \r\n return "data:image/jpeg;base64," + jpgBase64;
}

/**
* 图片转化成base64字符串
* @param imgPath
* @return
*/
public static String GetImageStr(String imgPath) {// 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
String imgFile = imgPath;// 待处理的图片
InputStream in = null;
byte[] data = null;
String encode = null; // 返回Base64编码过的字节数组字符串
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
try {
// 读取图片字节数组
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
encode = encoder.encode(data);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return encode;
}