java - 如何使用 xml 配置构建以下 bean？

Question

如何使用 xml 配置构建以下 bean？

@Configuration
public class RestConfig {
    @Bean
    public ResteasyClient restClient() {
        return new ResteasyClientBuilder()
                .establishConnectionTimeout(connectionTimeout, TimeUnit.SECONDS)
                .socketTimeout(socketTimeout, TimeUnit.SECONDS)
                .build();
    }
}

Answer 1

您可以尝试实现FactoryBean接口(interface):

public class ResteasyClientFactoryBean implements FactoryBean<ResteasyClient>{

    private int connectionTimeout;
    private int socketTimeout;


    public ResteasyClient getObject() throws Exception {
        return new ResteasyClientBuilder()
                    .establishConnectionTimeout(connectionTimeout, TimeUnit.SECONDS)
                    .socketTimeout(socketTimeout, TimeUnit.SECONDS)
                    .build();;
    }

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

    public boolean isSingleton() {
        return true;
    }

    public void setConnectionTimeout(int connectionTimeout) {
        this.connectionTimeout = connectionTimeout;
    }

    public void setSocketTimeout(int socketTimeout) {
        this.socketTimeout = socketTimeout;
    }
}

并添加以下 bean 定义到配置中:

<beans ..."> 
   <bean name="myResteasyClient" class="ResteasyClientFactoryBean">
       <property name="connectionTimeout" value="xxx"/>
       <property name="socketTimeout" value="xxx"/>
   </bean>
</beans>

然后你可以将此bean注入(inject)到另一个bean中，它将被解析为ResteasyClient实例。