Spring: Using builder pattern to create a bean

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You may try to implement FactoryBean interface:

public class HttpFactoryBean implements FactoryBean<HttpClient>{

private String host;
private int port;


public HttpClient getObject() throws Exception {
    return new StdHttpClient.Builder()
                            .host(host)
                            .port(port)
                            .build();
}

public Class<? extends HttpClient> getObjectType() {
    return StdHttpClient.class;
}

public boolean isSingleton() {
    return true;
}

public void setHost(String host) {
    this.host = host;
}

public void setPort(int port) {
    this.port = port;
}}

And add to config following bean definition:

<beans ..."> 
   <bean name="myHttpClient" class="HttpFactoryBean">
       <property name="port" value="8080"/>
       <property name="host" value="localhost"/>
   </bean>
</beans>

Then you can inject this bean to another beans, it will be resolved as StdHttpClient instance.

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