Spring：使用构建器模式创建一个bean [英] Spring: Using builder pattern to create a bean

问题描述

我使用 ektorp 连接到CouchDB。

I use ektorp to connect to CouchDB.

构建ektorp HttpClient 实例的方法是使用构建器模式：

The way to build an ektorp HttpClient instance is to use builder pattern:

HttpClient httpClient = new StdHttpClient.Builder()
                                .host("mychouchdbhost")
                                .port(4455)
                                .build();

我对Spring来说比较新。请教我如何在我的上下文中配置 HttpClient ，以便通过 Builder 创建它。

I am relatively new to Spring. Please advice me on how I can configure an HttpClient in my context to create it via the Builder.

一种方法是使用 @Configuration 。有没有其他选择？

One way to do this is with @Configuration. Are any other options?

推荐答案

您可以尝试实现 FactoryBean ：

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;
}}

并添加到配置以下bean定义：

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>

然后你可以将这个bean注入另一个bean，它将被解析为 StdHttpClient 实例。

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

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