java中應用DES加密解密實例

本文實例講述了Android受權拜訪網頁的完成辦法，即應用Webview顯示OAuth Version 2.a ImplicitGrant方法受權的頁，然則關於挪動終端不建議應用Authorize code grant方法受權。

詳細功效代碼以下所示：

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.http.SslError;
import android.os.Bundle;
import android.util.Log;
import android.webkit.SslErrorHandler;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import com.tencent.weibo.oauthv2.OAuthV2;
import com.tencent.weibo.oauthv2.OAuthV2Client;
/**
 * 應用Webview顯示OAuth Version 2.a ImplicitGrant方法受權的頁
 * (挪動終端不建議應用Authorize code grant方法受權
 * 本類應用辦法
 * 挪用本類的處所請添加以下代碼
 * //請將OAuthV2Activity改成類的類名
 * Intent intent = new Intent(OAuthV2Activity.this, OAuthV2AuthorizeWebView.class);
 * intent.putExtra("oauth", oAuth); //oAuth為OAuthV2類的實例，寄存受權相干信??
 * startActivityForResult(intent, myRrequestCode); //請設置適合的requsetCode
 * 重寫吸收回調信息的方
 * if (requestCode==myRrequestCode) { //對應之前設置的的myRequsetCode
 *   if (resultCode==OAuthV2AuthorizeWebView.RESULT_CODE) {
 *     //獲得前往的OAuthV2類實例oAuth
 *     oAuth=(OAuthV2) data.getExtras().getSerializable("oauth");
 *   }
 * }
 * @see android.app.Activity#onActivityResult(int requestCode, int resultCode, Intent data)
 */
public class MyWebView extends Activity {
  public final static int RESULT_CODE = 2;
  private OAuthV2 oAuth;
  private final String TAG = "MyWebView";
 private WebView mWebView;
  @SuppressLint("NewApi")
 @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview_qq);
    mWebView = (WebView) findViewById(R.id.qq_mywebview);;
    mWebView.setVerticalScrollBarEnabled(false);
 mWebView.setHorizontalScrollBarEnabled(false);
 Intent intent = this.getIntent();
    oAuth = (OAuthV2) intent.getExtras().getSerializable("oauth");
    String urlStr = OAuthV2Client.generateImplicitGrantUrl(oAuth);
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setSupportZoom(true);
    mWebView.requestFocus();
    mWebView.loadUrl(urlStr);
    System.out.println(urlStr.toString());
    Log.i(TAG, "WebView Starting....");
    WebViewClient client = new WebViewClient() {
    /* 回調辦法，當頁面加載時履行*/
      @Override
      public void onPageStarted(WebView view, String url, Bitmap favicon) {
        Log.i(TAG, "WebView onPageStarted...");
        Log.i(TAG, "URL = " + url);
        if (url.indexOf("access_token=") != -1) {
          int start=url.indexOf("access_token=");
          String responseData=url.substring(start);
          OAuthV2Client.parseAccessTokenAndOpenId(responseData, oAuth);
          Intent intent = new Intent();
          intent.putExtra("oauth", oAuth);
          setResult(RESULT_CODE, intent);
          finish();
        }
        super.onPageStarted(view, url, favicon);
        Log.i(TAG, "999999999");
      }
      /* TODO Android2.2及以上版本能力應用該辦法，今朝https://open.t.qq.com中存在http資本會惹起sslerror，待網站修改後可去失落該方*/
 public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
        if ((null != view.getUrl()) && (view.getUrl().startsWith("https://open.t.qq.com"))) {
          handler.proceed();// 接收證書
        } else {
          handler.cancel(); // 默許的處置方法，WebView釀成空白
        }
        // handleMessage(Message msg); 其他處置
      }
    };
    mWebView.setWebViewClient(client);
  }
}

 /**
  * 解密以byte[]密文輸出,以byte[]明文輸入
  *
  * @param bt
  *            待解密的字節碼
  * @return 解密後的字節碼
  */
 private byte[] getDesCode(byte[] bt) {
  Cipher cipher;
  byte[] byteFina = null;
  try {
   // 獲得Cipher實例
   cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
   cipher.init(Cipher.DECRYPT_MODE, key, iv);
   byteFina = cipher.doFinal(bt);
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   cipher = null;
  }
  return byteFina;
 }
}