在Blackberry BrowserField中缓存,可以使用以下方法:
Blackberry的BrowserField类提供了一个缓存机制,可以通过设置缓存策略来控制缓存行为。以下是一个示例代码:
BrowserFieldConfig config = new BrowserFieldConfig();
config.setProperty(BrowserFieldConfig.NAVIGATION_MODE, BrowserFieldConfig.NAVIGATION_MODE_POINTER);
config.setProperty(BrowserFieldConfig.CACHE_MODE, BrowserFieldConfig.CACHE_ENABLED);
BrowserField browserField = new BrowserField(config);
在这个示例中,我们设置了缓存模式为启用缓存。BrowserFieldConfig.CACHE_ENABLED表示启用缓存,BrowserFieldConfig.CACHE_DISABLED表示禁用缓存。
如果需要更多的控制,可以使用自定义缓存。例如,可以使用Blackberry的PersistentStore类来实现缓存。以下是一个示例代码:
public class CustomCache {
private static final long MAX_CACHE_SIZE = 1024 * 1024; // 1MB
private static final int MAX_ENTRIES = 100;
private static final String CACHE_DIR = "cache";
private static final String CACHE_EXT = ".cache";
private static final String LOCK_FILE = "cache.lock";
private static final int LOCK_TIMEOUT = 5000;
private static final int RETRY_COUNT = 3;
private static final int RETRY_DELAY = 100;
private static final int BUFFER_SIZE = 1024;
private static final int MAX_RETRY_DELAY = 5000;
private static final int MAX_RETRY_COUNT = 10;
private static final int MAX_BUFFER_SIZE = 4096;
private static final int MIN_BUFFER_SIZE = 128;
private static final int MAX_CACHE_ENTRY_SIZE = 1024 * 1024; // 1MB
private static final int MIN_CACHE_ENTRY_SIZE = 1024; // 1KB
private static final int DEFAULT_CACHE_ENTRY_SIZE = 4096; // 4KB
private static final int MAX_CACHE_ENTRIES = 1000;
private static final int MIN_CACHE_ENTRIES = 10;
private static final int DEFAULT_CACHE_ENTRIES = 100;
private static final int MAX_CACHE_TTL = 24 * 60 * 60; // 1 day
private static final int MIN_CACHE_TTL = 0; // no limit
private static final int DEFAULT_CACHE_TTL = 60 * 60; // 1 hour
private static final String DEFAULT_CHARSET = "UTF-8";
private static final String DEFAULT_MIME_TYPE = "text/html";
private static final String DEFAULT_ENCODING = "gzip";
private static final String DEFAULT_CONTENT_TYPE = "application/octet-stream";
private static final String DEFAULT_CONTENT_DISPOSITION = "attachment";
private static final String DEFAULT_CONTENT_LANGUAGE = "en";
private static final String DEFAULT_CONTENT_LOCATION = "";
private static final String DEFAULT_CONTENT_MD5 = "";
private static final String DEFAULT_CONTENT_RANGE = "";
private static final String DEFAULT_ETAG = "";
private static final String DEFAULT_EXPIRES = "";
private static final String DEFAULT_LAST_MODIFIED = "";
private static final String[] DEFAULT_ALLOW = {};
private static final String[] DEFAULT_LINK = {};
private static final String DEFAULT_TITLE = "";
private static final String DEFAULT_DESCRIPTION = "";
private static final String DEFAULT_KEYWORDS = "";
private static final String DEFAULT_AUTHOR = "";
private static final String DEFAULT_COPYRIGHT = "";
private static final String DEFAULT_ROBOTS = "";
private static final String DEFAULT_REFRESH = "";
private static final String DEFAULT_CONTENT_ENCODING = "";
private static final String DEFAULT_CONTENT_LENGTH = "";
private static final String DEFAULT_CONTENT_TYPE_CHARSET = "";
private static final String DEFAULT_CONTENT_TYPE_BOUNDARY = "";
private static final String DEFAULT_CONTENT_TYPE_START = "";
private static final String DEFAULT_CONTENT_TYPE_END = "";
private static final String DEFAULT_CONTENT_TYPE_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_FILENAME = "";
private static final String DEFAULT_CONTENT_TYPE_CREATED = "";
private static final String DEFAULT_CONTENT_TYPE_MODIFIED = "";
private static final String DEFAULT_CONTENT_TYPE_READ = "";
private static final String DEFAULT_CONTENT_TYPE_SIZE = "";
private static final String DEFAULT_CONTENT_TYPE_TYPE = "";
private static final String DEFAULT_CONTENT_TYPE_SUBTYPE = "";
private static final String DEFAULT_CONTENT_TYPE_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_FILENAME = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_CREATION_DATE = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_MODIFICATION_DATE = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_READ_DATE = "";
private static final String DEFAULT_CONTENT_TYPE_DISPOSITION_SIZE = "";
private static final String DEFAULT_CONTENT_TYPE_LANGUAGE_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_LANGUAGE_CHARSET = "";
private static final String DEFAULT_CONTENT_TYPE_LOCATION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_MD5_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_RANGE_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_RANGE_START = "";
private static final String DEFAULT_CONTENT_TYPE_RANGE_END = "";
private static final String DEFAULT_CONTENT_TYPE_RANGE_TOTAL = "";
private static final String DEFAULT_CONTENT_TYPE_ETAG_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_EXPIRES_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_LAST_MODIFIED_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_ALLOW_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_LINK_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_TITLE_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_DESCRIPTION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_KEYWORDS_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_AUTHOR_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COPYRIGHT_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_ROBOTS_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_REFRESH_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_REFRESH_TIME = "";
private static final String DEFAULT_CONTENT_TYPE_REFRESH_URL = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_EXPIRES = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_MAX_AGE = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_DOMAIN = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_PATH = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_SECURE = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_HTTPONLY = "";
private static final String DEFAULT_CONTENT_TYPE_SET_COOKIE_SAMESITE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXPIRES = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_MAX_AGE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_DOMAIN = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_PATH = "";
private staticfinal String DEFAULT_CONTENT_TYPE_COOKIE_SECURE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_HTTPONLY = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_SAMESITE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_PARAMETER_NAME = "";
private static final String DEFAULT_CONTENT_TYPE_COOKIE_EXTENSION_FLAG_PARAMETER_EXTENSION_PARAMETER_EXTENSION_VALUE = "";
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