最近在编写平台对接软件，需要从Oracle中取出blob类型图片数据转换为base64字符串写入到xml中，这里记录一下用到的转换方法
// 将一张本地图片转化成Base64字符串
public static String GetImageStrFromPath(String imgPath) {
InputStream in = null;
byte[] data = null;
// 读取图片字节数组
try {
in = new FileInputStream(imgPath);
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();
// 返回Base64编码过的字节数组字符串
return encoder.encode(data);
}
// 将一张网络图片转化成Base64字符串
public String GetImageStrFromUrl(String imgURL) {
byte[] data = null;
try {
// 创建URL
URL url = new URL(imgURL);
// 创建链接
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5 * 1000);
InputStream inStream = conn.getInputStream();
data = new byte[inStream.available()];
inStream.read(data);
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}
// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
// 返回Base64编码过的字节数组字符串
return encoder.encode(data);
}
// 将blob类型图片转换为Base64字符串
public static String blobToBase64(Blob blob) {
String result = "";
if (null != blob) {
try {
InputStream msgContent = blob.getBinaryStream();
ByteArrayOutputStream output = new ByteArrayOutputStream();
byte[] buffer = new byte[100];
int n = 0;
while (-1 != (n = msgContent.read(buffer))) {
output.write(buffer, 0, n);
}
result = new BASE64Encoder().encode(output.toByteArray());
output.close();
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return result;
} else {
return null;
}
}
// 将base64字符串转换成图片
public static boolean GenerateImage(String imgStr) {
if (imgStr == null) // 图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try {
// Base64解码
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;
}
}
// 生成jpeg图片
String imgFilePath = "d://222.jpg";
OutputStream out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
return true;
} catch (Exception e) {
return false;
}
}
原文地址：https://blog.51cto.com/14221100/2396127