服务定位器模式实现-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangweikai966/article/details/6342196

本文介绍了一种使用服务定位器模式来查找并实例化服务的方法。通过获取类名的短名称，并利用反射创建对应的实现类，实现了灵活的服务定位。文章详细展示了如何为特定的服务类创建实例。

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AccountAS accountAS = (AccountAS) ServiceLocator.findService(AccountAS.class);

public static Object findService(Class serviceClass)
    {
        String _oName = ClassUtil.getShortClassName(serviceClass.getName());
        Object obj = findService(_oName);
        if(obj == null)
            obj = ClassUtil.createClass((new StringBuilder()).append(serviceClass.getName()).append("Impl").toString());
        return obj;
    }

public static String getShortClassName(String className)
    {
        if(className == null)
            return "";
        if(className.length() == 0)
            return "";
        char chars[] = className.toCharArray();
        int lastDot = 0;
        for(int i = 0; i < chars.length; i++)
        {
            if(chars[i] == '.')
            {
                lastDot = i + 1;
                continue;
            }
            if(chars[i] == '$')
                chars[i] = '.';
        }

        return new String(chars, lastDot, chars.length - lastDot);
    }

public static Object createClass(String className)
    {
        Object result = null;
        try
        {
            result = Class.forName(className).newInstance();
        }
        catch(Exception ex)
        {
            throw new IllegalArgumentException((new StringBuilder()).append("Error getting class [").append(className).append("]: problem with class file or dependent class. Root cause: ").append(ex).toString());
        }
        catch(LinkageError ex)
        {
            throw new IllegalArgumentException((new StringBuilder()).append("Error loading class [").append(className).append("]: problem with class file or dependent class. Root cause: ").append(ex).toString());
        }
        return result;
    }

一段小代码