设计模式实战：日志系统的设计与实现
// 统一的日志格式接口
interface LogFormatAdapter {
String format(String message);
}
// 适配器实现
class JsonLogFormatAdapter implements LogFormatAdapter {
private JsonLogFormat jsonLogFormat;
public JsonLogFormatAdapter(JsonLogFormat jsonLogFormat) {
this.jsonLogFormat = jsonLogFormat;
}
@Override
public String format(String message) {
return jsonLogFormat.toJson(message);
}
}
class XmlLogFormatAdapter implements LogFormatAdapter {
private XmlLogFormat xmlLogFormat;
public XmlLogFormatAdapter(XmlLogFormat xmlLogFormat) {
this.xmlLogFormat = xmlLogFormat;
}
@Override
public String format(String message) {
return xmlLogFormat.toXml(message);
}
}
// 现有的日志格式类
class JsonLogFormat {
public String toJson(String message) {
return "{ \"log\": \"" + message + "\" }";
}
}
class XmlLogFormat {
public String toXml(String message) {
return "<log>" + message + "</log>";
}
}