工厂模式的一个简单实现

1 工厂类

public class testfactory {

    /**
     *
     */
    private static map<string, testinterface> beanmap = contextutil.getcontext().getbeansoftype(testinterface.class, false, false);

    public static testinterface getinstance(string inftype) {
        testinterface curinstance = null;
        for (string beanname : beanmap.keyset()) {
            testinterface instance = beanmap.get(beanname);
            if (instance.gettype() == null)
                throw new runtimeexception("接口实现类类型不可以为空");
            else {
                if (inftype.equals(instance.gettype())) {
                    curinstance = instance;
                    break;
                }
            }
        }
        return curinstance;
    }
}

2 获取bean类

根据spring上下文得到某个接口的实现类。

public class contextutil implements applicationcontextaware {

    private static applicationcontext context;

    @override
    public void setapplicationcontext(applicationcontext applicationcontext) throws beansexception {
        contextutil.context = applicationcontext;
    }

    public static applicationcontext getcontext() {
        return context;
    }
}

3 需要获取实例的接口类

public interface testinterface<t> {

    string gettype();

    void testfunc(t t);
}

4 testinterface的一个实现类

public class testinterfaceimpl implements testinterface<string> {
    @override
    public string gettype() {
        return "1";
    }

    @override
    public void testfunc(string s) {
        system.out.println("testinterfaceimpl -- 01");
    }
}