Java Base64类代码示例

import com.loopj.android.http.Base64; //导入依赖的package包/类
@Override
public Header[] getRequestHeaders() {
    List<Header> headers = getRequestHeadersList();

    // Add authentication header.
    if (userName != null && passWord != null) {
        byte[] base64bytes = Base64.encode(
                (userName + ":" + passWord).getBytes(),
                Base64.DEFAULT
        );
        String credentials = new String(base64bytes);
        headers.add(new BasicHeader(HEADER_AUTHORIZATION, HEADER_BASIC + " " + credentials));
    }

    return headers.toArray(new Header[headers.size()]);
}
 

import com.loopj.android.http.Base64; //导入依赖的package包/类
private static String hmac_sha1(String key,String message) {
    String reString = null;
    try {
        byte[] data = key.getBytes("UTF-8");
        //根据给定的字节数组构造一个密钥,第二参数指定一个密钥算法的名称
        SecretKey secretKey = new SecretKeySpec(data, "HmacSHA1");
        //生成一个指定 Mac 算法 的 Mac 对象
        Mac mac = Mac.getInstance("HmacSHA1");
        //用给定密钥初始化 Mac 对象
        mac.init(secretKey);

        byte[] text = message.getBytes("UTF-8");
        //完成 Mac 操作
        byte[] text1 = mac.doFinal(text);
        reString = Base64.encodeToString(text1, Base64.URL_SAFE);
    } catch (Exception e)
    {
        e.printStackTrace();
    }
    return reString;
}
 

import com.loopj.android.http.Base64; //导入依赖的package包/类
/**
 * Convert a bitmap object to a Base64 encoded string.
 * @param image The image to convert.
 * @return A String in Base64 containing the image data.
 */
protected String base64FromBitmap(Bitmap image) {
    // Create a compressed byte array from the provided image. 80% JPEG seems to be enough
    // for accurate recognition
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    image.compress(CompressFormat.JPEG, 80, byteArrayOutputStream);
    byte[] byteArray = byteArrayOutputStream.toByteArray();
    String encoded = Base64.encodeToString(byteArray, 0);
    return encoded;
}
 

import com.loopj.android.http.Base64; //导入依赖的package包/类
/**
 * 生成签名字符串
 * 
 * @param url
 *            网络地址
 * @param method
 *            请求方法
 * @param params
 *            请求参数
 * @param appsecret
 *            签名密钥
 * @param dbg
 *            是否开启调试：调式模式可打印签名日志
 * @return
 */
public String makeSign(String url, String method, RequestParams params, String appsecret, boolean dbg) {
	StringBuilder sb = new StringBuilder();
	sb.append(method).append("&");
	sb.append(Uri.encode(url)).append("&");
	// 排序
	List<BasicNameValuePair> basicNameValuePairs = params.getParamsList();
	Collections.sort(basicNameValuePairs, paramsCompre);
	String paramStr = URLEncodedUtils.format(basicNameValuePairs, "UTF-8");
	sb.append(Uri.encode(paramStr));

	String digit = TXSHAUtil.getSHA1(sb.toString());

	byte[] encrypt = TXXXTEA.encrypt(digit.getBytes(), appsecret.getBytes());

	String base64 = Base64.encodeToString(encrypt, Base64.DEFAULT);

	String sign = Uri.encode(base64);

	if (dbg) {
		TXDebug.o(new Exception(), "url : " + sb.toString());
		TXDebug.o(new Exception(), "digit : " + digit);
		TXDebug.o(new Exception(), "base64 : " + base64);
		TXDebug.o(new Exception(), "sign : " + sign);
	}
	
	params.put("sign", sign);

	return sign;
}
 

import com.loopj.android.http.Base64; //导入依赖的package包/类
public static  String getUploadToken(String fileName) {

        String token = null;
        try{
            //一：将上传策略转换成Json格式
            JSONObject policy = new JSONObject();
            StringBuilder scope = new StringBuilder();
            scope.append(bucket);
            scope.append(":");
            scope.append(fileName);
            policy.put("scope",scope.toString());   //只允许上传指定key的文件，而key就是文件名
            scope = null;
            policy.put("deadline",getTimer());
            //policy.put("insertOnly",1); //不允许修改
            //policy.put("callbackFetchKey",1);   //启动fetchKey上传模式
            // policy.put("returnBody ","{\"name\" : \"$(fname))}");
            Log.d("policy",policy.toString());

            //二：对JSON编码的上传策略进行URL安全的Base64编码，得到待签名字符串：
            String encodPutPolicy = Base64.encodeToString(policy.toString().getBytes("UTF-8"), Base64.URL_SAFE);
            Log.i("encodPutPolicy","encodPutPolicy is "  + encodPutPolicy);

            //三：使用SecertKey对上一步生成的待签名字符串计算HMAC-SHA1签名：并对签名进行URL安全的Base64编码：
            String encodSign = hmac_sha1(SK,encodPutPolicy);
            Log.i("encodSign","encodSign is "  + encodSign);

            //五：将AccessKey、encodedSign和encodedPutPolicy用:连接起来：
            token = AK + ':' + encodSign + ':' + encodPutPolicy;
            Log.i("token","token is "  + token);

        }catch (Exception e) {
            e.printStackTrace();
        }
        return token;
    }