应用程序上下文中的Java Bean定义（春季）

Question

I am new to Spring IOC, how can I convert this method to a bean definition in application context xml?

import com.sun.jersey.api.client.Client;
import com.sun.jersey.client.apache.ApacheHttpClient;
import com.sun.jersey.client.apache.config.ApacheHttpClientConfig;
import com.sun.jersey.client.apache.config.DefaultApacheHttpClientConfig;

public static Client getRestClient() {
    // configuration for jersey client
    ApacheHttpClientConfig config = new DefaultApacheHttpClientConfig();
    Map<String, Object> properties = config.getProperties();
    properties.put(ApacheHttpClientConfig.PROPERTY_CONNECT_TIMEOUT,
            RESTUtil.dispatcherHttpTimeOut);

    // create client
    return ApacheHttpClient.create(config);
}

More detail: I want to get an instance of Client from the spring IOC, currently I use this method (getRestClient) to get it, so something like this:

<!-- Apache http rest client -->
<bean id="apacheHttpClient" name="Rest Client"
    class="com.sun.jersey.client.apache.ApacheHttpClient" factory-method="create">
    <constructor-arg></constructor-arg>
</bean>

Please let me know if any more information is needed.

Answer 1

<bean id="apacheHttpClient" class="com.sun.jersey.client.apache.ApacheHttpClient" 
         factory-method="getRestClient"/>

Seems like you pretty much had it. Was it not working? You just then need to pass this bean as a ref as a property or constructor arg to any class that needs to use it.

Answer 2

I guess what you wanted to ask was how to tell Spring to create the bean using a static factory method.

This thread might help.

<bean id="restClient" class="com.your.app.ClassWithTheFactoryMethod" factory-method="getRestClient"/> </bean>

should work

Answer 3

This is the closest I could come to doing exactly what you had in your code. I had to refer to the ApacheHttpClientConfig.PROPERTY_CONNECT_TIMEOUT's value literally, and just put in 120 for RESTUtil.dispatcherHttpTimeOut (because I don't know what it is). Note that the "#{120}" expression is needed to pass that value in as an Integer rather than a String, which would cause an exception.

<!-- Apache http rest client -->
<bean id="apacheHttpClient" name="Rest Client"
    class="com.sun.jersey.client.apache.ApacheHttpClient" factory-method="create">
    <constructor-arg>
        <bean class="com.sun.jersey.client.apache.config.DefaultApacheHttpClientConfig">
            <property name="properties['com.sun.jersey.client.property.connectTimeout']" value="#{120}" />
        </bean>
    </constructor-arg>
</bean>