Question

我是Spring框架的新手。我打算用我的下一个项目使用两个gridfs模板。我想使用两个不同的数据库“ProductImage”和“ProfileImage”。根据用户上传的图像，应插入相关数据库中。所以我试图按如下方式配置我的application-context.xml

<!-- Mongo GridFs settings -->
    <!-- Connection to MongoDB server -->
    <mongo:db-factory host="192.168.1.3" port="27017"
        dbname="ProfileImages" />
    <mongo:mapping-converter id="converter"
        db-factory-ref="mongoDbFactory" />

    <!-- MongoDB GridFS Template -->
    <beans:bean id="gridTemplate"
        class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
        <beans:constructor-arg ref="mongoDbFactory" />
        <beans:constructor-arg ref="converter" />
    </beans:bean>

当我添加这个时，我的项目工作正常，但是当我添加

时

<!-- Adding another mongo gridsfs -->
    <!-- Connection to MongoDB server -->
    <mongo:db-factory host="192.168.1.3" port="27017"
        dbname="ProductImages" />
    <mongo:mapping-converter id="ProductImages"
        db-factory-ref="mongoDbFactory" />

    <!-- MongoDB GridFS Template -->
    <beans:bean id="gridTemplate1"
        class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
        <beans:constructor-arg ref="mongoDbFactory" />
        <beans:constructor-arg ref="ProductImages" />
    </beans:bean>

我的程序抛出异常，如

org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [org.springframework.data.mongodb.gridfs.GridFsOperations] is defined: expected single matching bean but found 2: [gridTemplate, gridTemplate1]

我缺少哪里？

Answer 1

如果你正在使用@Autowired注释并且有多个好的候选者（比如你添加了第二个定义bo GridFsTemplate），那么你需要使用另一个注释@Qualifier。否则spring怎么会告诉你想要注入哪个gridfs实例？

样品：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;

public class MyBean {
    @Autowired @Qualifier("gridTemplate") private GridFsTemplate fs1;
    @Autowired @Qualifier("gridTemplate1") private GridFsTemplate fs2;
}

编辑：您还需要在xml配置中正确绑定bean（您有两个mongo：db-factory beans）：

<!-- Mongo GridFs settings -->
    <!-- Connection to MongoDB server -->
    <mongo:db-factory host="192.168.1.3" port="27017"
        id="profileImagesDbFactory"
        dbname="ProfileImages" />
    <mongo:mapping-converter id="profileImagesConverter"
        db-factory-ref="profileImagesDbFactory" />

    <!-- MongoDB GridFS Template -->
    <beans:bean id="gridTemplate"
        class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
        <beans:constructor-arg ref="profileImagesDbFactory" />
        <beans:constructor-arg ref="profileImagesConverter" />
    </beans:bean>

<!-- Adding another mongo gridsfs -->
    <!-- Connection to MongoDB server -->
    <mongo:db-factory host="192.168.1.3" port="27017"
        id="productImagesDbFactory"
        dbname="ProductImages" />
    <mongo:mapping-converter id="ProductImages"
        db-factory-ref="mongoDbFactory" />

    <!-- MongoDB GridFS Template -->
    <beans:bean id="gridTemplate1"
        class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
        <beans:constructor-arg ref="productImagesDbFactory" />
        <beans:constructor-arg ref="ProductImages" />
    </beans:bean>

Spring在servlet-context.xml中添加了多个GridFS模板

1 个答案: