带类型安全的Kotlin中的Spring注入UTIL：Map

Question

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                            http://www.springframework.org/schema/util  http://www.springframework.org/schema/util/spring-util.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <util:map id="brandSql" key-type="java.lang.String" value-type="java.lang.String">
        <entry key="selectBrands">
            <value type="java.lang.String">
                <![CDATA[
                SELECT
                    ID,
                    NAME
                FROM BRAND
                ]]>
            </value>
        </entry>
    </util:map>

</beans>

@Service
open class JdbcBrandService @Autowired constructor(
    private val namedJdbcTemplate: NamedParameterJdbcTemplate
): BrandService {

    companion object {
        val logger = LoggerFactory.getLogger(JdbcBrandService::class.java)
    }

    @Autowired
    @Qualifier(value = "brandSql")
    private lateinit var queries: Map<Any,Any>

    /// methods and what not go here
}

@RestController
public class JavaBrandController {

    private final Map<String, String> brandSql;

    @Autowired
    public JavaBrandController(@Qualifier("brandSql") Map sql) {
        this.brandSql = sql;
    }

    @GetMapping("/javaBrands")
    public Map getBrandSql() {
        return this.brandSql;
    }
}

Answer 1

就我个人而言，让像map 这样的泛型类型的bean四处漂浮感觉很奇怪。当你需要其他地图时，这会造成混乱。

我要做的是创建一个容器类，它保存对映射的引用，这样您就有了一个合适的类型来引用。

示例：

class SqlConfig(val map: Map<String, String>)

<util:map id="brandSql" key-type="java.lang.String" value-type="java.lang.String">
    <entry key="selectBrands">
        <value type="java.lang.String">
            <![CDATA[
            SELECT
                ID,
                NAME
            FROM BRAND
            ]]>
        </value>
    </entry>
</util:map>

<bean id = "sqlConfig" class = "test.package.SqlConfig">
   <constructor-arg ref = "brandSql"/>
</bean>

@Autowired
@Qualifier(value = "sqlConfig") // <-- the qualifier is no longer needed
private lateinit var queries: SqlConfig