Spring: Configuring Bean with a two argument sette

问题:

I would like to configure a HttpParams using spring setter injection but HttpParams has a two argument setter ( setParameter(String name, Object object) ). Is anyone aware of a way to configure this in spring?

The closest I can think of is like you would do a List, Set, or Property configuration:

http://www.mkyong.com/spring/spring-collections-list-set-map-and-properties-example/

Thanks!

回答1:

Strictly speaking: A setter with two parameters is not a setter. It violates the JavaBeans convention, on which Spring builds. There is no simple way to solve that.

---

As an alternative, here's a Helper class you can use to configure your HttpParams object with Spring:

public class HttpParamSetter{

    private HttpParams httpParams;

    public void setHttpParams(HttpParams httpParams){
        this.httpParams = httpParams;
    }

    private Map<String, Object> parameters;

    public void setParameters(Map<String, Object> parameters){
        this.parameters = parameters;
    }

    @PostConstruct
    public void applyParameters(){
        for(Entry<String, Object> entry:parameters.entrySet()){
            httpParams.setParameter(entry.getKey(), entry.getValue());
        }

    }

}

Wire it like this:

<bean class="com.yourcompany.HttpParamSetter">
    <property name="httpParams" ref="httpParams" />
    <property name="parameters">
        <map>
            <entry key="foo" value="bar" />
            <entry key="baz" value="phleem" />
        </map>
    </property>
</bean>

回答2:

I believe HttpConnectionParamBean and HttpProtocolParamBean were created for precisely this purpose. Documentation Example

回答3:

Are you using Apache HttpClient? If so, the HttpClientParams implementation of HttpParams has real getters and setters that you can use.

Otherwise, I'd suggest writing a simple HttpParamsFactory that you could pass a map that contains the parameters you need and construct an appropriate instance of HttpParams.