Question

我是SpringBoot的新手，并尝试使用内置的SpringBoot批注从YML文件中读取属性。

以下是代码：

AppProperties.java

@Component
@ConfigurationProperties(prefix = "patterns")
public class AppProperties {

    private List<PasswordPattern> password_patterns = new ArrayList<>();

    public static class PasswordPattern {
        private String pattern1;

        @Autowired
        public String getPattern1() {
            return pattern1;
        }

        public void setPattern1(String pattern1) {
            this.pattern1 = pattern1;
        }
    }

}

在其中调用AppProperty的测试类

Test1.java

public class Test1 {

    public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
        // TODO Auto-generated method stub

        AppProperties.PasswordPattern a = new AppProperties.PasswordPattern();

        System.out.println(a.getPattern1());
    }

}

application.yml文件

--- 
patterns: 
  password_patterns: 
  pattern1: "test"

EXPECTATION：是getPattern1（）方法应返回从yml文件读取的值

我针对此类问题推荐了许多帖子，但没有弄清楚我在做什么错误。我错过了任何特定的注释吗？我对

@自动接线

它与依赖注入有关，我也用过... 请建议

进一步的编辑：

关注“ Alexander pinkin”的帖子后，出现以下错误：

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'patterns.password-patterns' to java.util.Map<ja
va.lang.String, java.lang.String>:

    Reason: No converter found capable of converting from type [java.lang.String
] to type [java.util.Map<java.lang.String, java.lang.String>]

Action:

Update your application's configuration

进一步编辑2：

AppProperties.java

@Component
@ConfigurationProperties(prefix = "patterns")
public class AppProperties {

    private List<Menu> menus = new ArrayList<>();

    public static class Menu {
        private String pattern1;

        public String getPattern1() {
            return pattern1;
        }

        public void setPattern1(String pattern1) {
            this.pattern1 = pattern1;
        }

    }
}

PasswordpatApplication.java

@SpringBootApplication
@EnableConfigurationProperties(AppProperties.class)
public class PasswordpatApplication {

    private static final Logger LOG = LoggerFactory.getLogger(PasswordpatApplication.class);

    @Autowired
    public static void main(String[] args) {
        SpringApplication.run(PasswordpatApplication.class, args);

        AppProperties.Menu a = new AppProperties.Menu();
        LOG.info("hi");
        LOG.info(a.getPattern1());

    }

application.yml

patterns: 
  password-patterns: 
  pattern1: test

输出：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.4.RELEASE)

2018-08-24 18:56:21.116  INFO 11712 --- [           main] c.e.passwordpat.Passwo
rdpatApplication   : Starting PasswordpatApplication v0.0.1-SNAPSHOT on PUNITP13
0066L with PID 11712 (C:\Users\irfan.sayed\Downloads\passwordpat\target\password
pat-0.0.1-SNAPSHOT.jar started by irfan.sayed in C:\Users\irfan.sayed\Downloads\
passwordpat\target)
2018-08-24 18:56:21.131  INFO 11712 --- [           main] c.e.passwordpat.Passwo
rdpatApplication   : No active profile set, falling back to default profiles: de
fault
2018-08-24 18:56:21.271  INFO 11712 --- [           main] s.c.a.AnnotationConfig
ApplicationContext : Refreshing org.springframework.context.annotation.Annotatio
nConfigApplicationContext@6c629d6e: startup date [Fri Aug 24 18:56:21 IST 2018];
 root of context hierarchy
2018-08-24 18:56:22.066  WARN 11712 --- [           main] f.a.AutowiredAnnotatio
nBeanPostProcessor : Autowired annotation is not supported on static methods: pu
blic static void com.example.passwordpat.PasswordpatApplication.main(java.lang.S
tring[])
2018-08-24 18:56:23.887  INFO 11712 --- [           main] o.s.j.e.a.AnnotationMB
eanExporter        : Registering beans for JMX exposure on startup
2018-08-24 18:56:23.920  INFO 11712 --- [           main] c.e.passwordpat.Passwo
rdpatApplication   : Started PasswordpatApplication in 3.484 seconds (JVM runnin
g for 4.104)
2018-08-24 18:56:23.929  INFO 11712 --- [           main] c.e.passwordpat.Passwo
rdpatApplication   : hi
2018-08-24 18:56:23.931  INFO 11712 --- [           main] c.e.passwordpat.Passwo
rdpatApplication   : null
2018-08-24 18:56:23.938  INFO 11712 --- [       Thread-2] s.c.a.AnnotationConfig
ApplicationContext : Closing org.springframework.context.annotation.AnnotationCo
nfigApplicationContext@6c629d6e: startup date [Fri Aug 24 18:56:21 IST 2018]; ro
ot of context hierarchy
2018-08-24 18:56:23.946  INFO 11712 --- [       Thread-2] o.s.j.e.a.AnnotationMB
eanExporter        : Unregistering JMX-exposed beans on shutdown

现在，控制台上什么都没有打印。既没有错误也没有异常

请提出建议

Answer 1

您应该启动Spring上下文，并将属性命名为“ password-patterns”或“ passwordPatterns”。

这应该有效：

AppProperties.java：

DemoApplication.java

application.yml

add_action('admin_menu', 'ccheck_set');

function ccheck_set() 
{
  add_menu_page('ccheck', 'Sidebar', 'edit_posts', 'ccheck', 'ccheck', 'dashicons-media-spreadsheet');
}

function ccheck()
{
  if($_POST['radio_clr'])
  {
    if (!empty(get_option('radio_clr', $_POST['radio_clr'])))
    {
      update_option('radio_clr', $_POST['radio_clr']);
    }
    else
    {
      add_option('radio_clr', $_POST['radio_clr']);
    }
  }
  echo '<form  method="POST"><table>
        <tr><td ><input type="radio" name="radio_clr" value="0"  >red
<input type="radio" name="radio_clr"  value="1" >Black</td></tr>
        <tr><td><input type="submit" name="submit"></td></tr>
    </table></form>';
  }

Answer 2

您可以使用@Value批注如果您的yml配置为

management:
 security:
  enabled: true

比您可以在@Configuration上使用的

@Value("${management.security.enabled}")
bolean managementSecurityenabled;

Answer 3

看起来像缩进问题。为确认起见，放置了任何其他直接属性

amazon:
associateId: habuma-20

尝试获取成功，然后尝试如下使用。

patterns: 
  password_patterns: 
    pattern1: "test"

如果上述方法不起作用，请尝试从“测试”中删除引号。

注意：避免使用标签http://yaml.org/faq.html

https://docs.saltstack.com/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html

Answer 4

首先，您应该修复缩进：

patterns: 
  password_patterns: 
  pattern1: "test"

到

patterns: 
  password_patterns: 
    pattern1: "test"

要注意的第二件事-您已将属性类标记为@Component，以便以后可以在春季上下文中找到它（我也建议在这里使用@Configuration，因为它会更自然是一种配置），因此当您想将其与填充的配置属性一起使用时，应从上下文中获取它。下一段代码将使您能够使用bean中的配置数据：

@Autowired
private AppProperties appProperties;

第三件事-确保@Configuration文件中的某处具有@EnableConfigurationProperties批注

在狭窄的patterns标签下使用整个AppProperties类也不是很明显...

Answer 5

除了 @Alexander Pankin 的答案外，程序可能会要求您在 pom.xml

中添加dependency

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

@ConfigurationProperties无法使用.YAML文件

5 个答案: