android读写cookie的方法示例

做了一个android网络应用，要求用自己实现的webview去访问web网站，并且在远程登录成功之后把cookie写入到手机，保留用作以后的自动登录。找了好多资料。发觉读取cookies倒还用的很普遍，可是通过程序写cookie却没有太多资料。

先来看一下如何读取cookie吧：

try
    {
     DefaultHttpClient httpclient = new DefaultHttpClient();
     HttpGet httpget = new HttpGet("http://www.hlovey.com");
     HttpResponse response = httpclient.execute(httpget);
     HttpEntity entity = response.getEntity();
     List<Cookie> cookies = httpclient.getCookieStore().getCookies();
     if (entity != null) {
       entity.consumeContent();
     }

     if (cookies.isEmpty()) {
      Log.i(TAG, "NONE");
     } else {
       for (int i = 0; i < cookies.size(); i++) {
        Log.i(TAG,"- domain " + cookies.get(i).getDomain());
        Log.i(TAG,"- path " + cookies.get(i).getPath());
        Log.i(TAG,"- value " + cookies.get(i).getValue());
        Log.i(TAG,"- name " + cookies.get(i).getName());
        Log.i(TAG,"- port " + cookies.get(i).getPorts());
        Log.i(TAG,"- comment " + cookies.get(i).getComment());
        Log.i(TAG,"- commenturl" + cookies.get(i).getCommentURL());
        Log.i(TAG,"- all " + cookies.get(i).toString());
       }
     }
     httpclient.getConnectionManager().shutdown();

    }catch(Exception e){
     //Todo
    }finally{
    //Todo
    }

通过分析com.android.browser的源码，发现android默认的browser增加cookie是在数据库中增加记录，和window不同，win是采用一个txt文本文件的形式来存储cookie。而android是将cookie存储在数据库中。具体的介绍在《android cookie存储位置》一文中有介绍。我们都知道，android每个应用程序的存储空间都是独立的。不管使用preference还是database存储，都会在每个/data/data/package name/下面进行存储（preference存储在/data/data/package name/shared_prefs/xxxx.xml）。前面也说到cookie是存在数据库中，那么如果采用非浏览器访问网络需要保留cookie的话我们就应该在database中建立cookies表，并且存入相应的cookies数据。仿照默认broswer的代码：

/**声明一些数据库操作的常量*/
 private static SQLiteDatabase mDatabase = null;
 private static final String DATABASE_FILE = "webview.db";
 private static final String COOKIES_NAME_COL = "name";
 private static final String COOKIES_VALUE_COL = "value";
 private static final String COOKIES_DOMAIN_COL = "domain";
 private static final String COOKIES_PATH_COL = "path";
 private static final String COOKIES_EXPIRES_COL = "expires";
 private static final String COOKIES_SECURE_COL = "secure";
mDatabase = LoginApiActivity.this.openOrCreateDatabase(DATABASE_FILE, 0, null);
//创建cookie数据库
  if (mDatabase != null) {
   // cookies
   mDatabase.execSQL("CREATE TABLE IF NOT EXISTS cookies "
       + " (_id INTEGER PRIMARY KEY, "
       + COOKIES_NAME_COL + " TEXT, " + COOKIES_VALUE_COL
       + " TEXT, " + COOKIES_DOMAIN_COL + " TEXT, "
       + COOKIES_PATH_COL + " TEXT, " + COOKIES_EXPIRES_COL
       + " INTEGER, " + COOKIES_SECURE_COL + " INTEGER" + ");");
   mDatabase.execSQL("CREATE INDEX IF NOT EXISTS cookiesIndex ON "
       + "cookies" + " (path)");
  }
 }

/*写cookie*/
 public void addCookie(Cookie cookie) {
  if (cookie.getDomain() == null || cookie.getPath() == null || cookie.getName() == null
      || mDatabase == null) {
    return;
  }
  String mCookieLock = "asd";
  synchronized (mCookieLock) {
    ContentValues cookieVal = new ContentValues();
    cookieVal.put(COOKIES_DOMAIN_COL, cookie.getDomain());
    cookieVal.put(COOKIES_PATH_COL, cookie.getPath());
    cookieVal.put(COOKIES_NAME_COL, cookie.getName());
    cookieVal.put(COOKIES_VALUE_COL, cookie.getValue());

    mDatabase.insert("cookies", null, cookieVal);

  }
}

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