在Spring中使用@PropertyResource访问多个属性文件


问题内容

使用@PropertySourceSpring 3.1中的新注释,如何使用Environment访问多个属性文件?

目前我有:

@Controller
@Configuration 
@PropertySource(
    name = "props",
    value = { "classpath:File1.properties", "classpath:File2.properties" })
public class TestDetailsController {


@Autowired
private Environment env;
/**
 * Simply selects the home view to render by returning its name.
 */
@RequestMapping(value = "/", method = RequestMethod.GET)
public String home(Locale locale, Model model) {

    String file1Name = env.getProperty("file1.name","file1.name not found");
            String file2Name = env.getProperty("file2.name","file2.name not found");

            System.out.println("file 1: " + file1Name);
            System.out.println("file 2: " + file2Name);

    return "home";
}

结果是 File1.properties中 的正确文件名,但未找到 file2.name 。如何访问 File2.properties


问题答案:

有两种不同的方法:第一种是在applicationContext.xml中使用PropertyPlaceHolder: beans-factory-
placeholderconfigurer

<context:property-placeholder location="classpath*:META-INF/spring/properties/*.properties"/>

要添加的名称空间是 xmlns:context="http://www.springframework.org/schema/context"

如果要在控制器中直接访问键以访问String变量,请使用:

@Value("${some.key}")
private String valueOfThatKey;

第二种方法是util:properties在您的applicationContext.xml中使用:

<util:properties id="fileA" location="classpath:META-INF/properties/a.properties"/>
<util:properties id="fileB" location="classpath:META-INF/properties/b.properties"/>

使用名称空间架构xmlns:util="http://www.springframework.org/schema/util"位置:http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd

然后在您的控制器中:

@Resource(name="fileA")
private Properties propertyA;

@Resource(name="fileB")
private Properties propertyB;

如果要从文件中获取值,请使用方法getProperty(String key)