Question

我正在使用intellij，Spring和Gradle。

我有一个发送电子邮件的课程。使用new运算符创建所述类。现在我read，可以使用@Configureable注释来自动装配这样的类。我似乎无法让它工作。也许有人对此有所了解并能指出我正确的方向？

    @Service
    @EnableAsync
    @Configurable(dependencyCheck=true,autowire= Autowire.BY_TYPE)
    public class EmailCommand implements ICommand {

    /**
     * standard logger.
     */
    private final Logger log = LoggerFactory.getLogger(this.getClass());

    /**
     * {@link MailSender} capable of sending out mails.
     */
    @Autowired
    @Inject
    private MailSender mailSender;

    /**
     * Sring with the Mailcontent.
     * Taken from application.properties
     */
    @Value("${spring.mail.content}")
    private String mailContent;

    /**
     * Sring with the mailsubject.
     * Taken from application.properties
     */
    @Value("${spring.mail.subject}")
    private String mailSubject;

    /**
     * The name of the sensor which triggered the alert.
     */
    private String sensorName;

    /**
     * the email-address to send the mail to.
     */
    private String emailAddress;

    /**
     * Standard constructor only used by Spring FW.
     */
    public EmailCommand() {
    }


    /**
     * Constructor used by the application.
     *
     * @param sensorName   {@link EmailCommand#sensorName}
     * @param emailAddress {@link EmailCommand#emailAddress}
     */
    public EmailCommand(final String sensorName, final String emailAddress) {
        this.sensorName = sensorName;
        this.emailAddress = emailAddress;
    }

    @Override
    public void execute() {
        SimpleMailMessage message = new SimpleMailMessage();
        String content = "asdf";//mailContent.replace("%SENSORNAME%", sensorName);
        message.setText(content);
        message.setSubject("asdf");
        message.setTo(emailAddress);
        try {
            mailSender.send(message);
        } catch (Exception e) {
            e.printStackTrace();
        }
        log.info("Sending Mail");
    }
}

我正在使用new运算符创建该类：

return new EmailCommand(title, user.getEmail());

之后我得到NPE：

mailSender.send(message);

由于mailsender为空。

我的应用程序注释如下：

@SpringBootApplication(
    exclude =
            {org
                    .springframework
                    .boot
                    .autoconfigure
                    .security
                    .SecurityAutoConfiguration.class
            })
@EnableLoadTimeWeaving(aspectjWeaving = 
EnableLoadTimeWeaving.AspectJWeaving.ENABLED)
@Configuration
@EnableSpringConfigured
public class WebApplication extends SpringBootServletInitializer {
public static void main(final String[] args) {
    SpringApplication.run(WebApplication.class, args);
}

}

WebApplication类位于Top-Level-Package中，所有其他类都位于该类的子包中。

我的Gradle文件：

buildscript {
ext {
    springBootVersion = '1.5.2.RELEASE'
}
repositories {
    maven { url "http://repo.spring.io/libs-milestone" }
    maven { url "http://repo.spring.io/libs-snapshot" }
    jcenter()
}
dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'war'
apply plugin: 'checkstyle'

sourceCompatibility = 1.8

repositories {
    mavenCentral()
    maven { url 'http://maven.springframework.org/release' }
    maven { url 'http://maven.springframework.org/milestone' }
    maven { url 'http://maven.springframework.org/snapshot' }
    maven { url 'http://download.java.net/maven/2' }
 }

war {
    baseName = 'noisemap'
    from '../noisemap-frontend/build'
}

test {
    ignoreFailures = true;
}

configurations {
    aspect
}

checkstyle {
    toolVersion = '6.7'
    ignoreFailures = true
}

dependencies {
//GMail
compile 'com.google.apis:google-api-services-oauth2:v1-rev132-1.22.0'
compile group: 'javax.mail', name: 'javax.mail-api', version: '1.5.5'
compile 'com.google.apis:google-api-services-gmail:v1-rev65-1.22.0'

aspect 'org.springframework:spring-instrument:3.0.4.RELEASE'
compile configurations.aspect.dependencies

compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.39'
compile('org.springframework.boot:spring-boot-starter-cache')
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-data-rest')
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-mail')
compile "org.springframework.social:spring-social-config:1.1.1.BUILD-SNAPSHOT"
compile "org.springframework.social:spring-social-core:1.1.1.BUILD-SNAPSHOT"
compile "org.springframework.social:spring-social-web:1.1.1.BUILD-SNAPSHOT"
compile 'org.springframework.security.oauth:spring-security-oauth2:2.1.0.RELEASE'
runtime('org.springframework.boot:spring-boot-devtools')
runtime('com.h2database:h2')
compileOnly('org.projectlombok:lombok')
providedRuntime('org.springframework.boot:spring-boot-starter-tomcat')
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile('org.springframework.restdocs:spring-restdocs-mockmvc')
testCompile('org.mockito:mockito-core:1.10.19')
testCompile('junit:junit:4.12')
testCompile('com.jayway.jsonpath:json-path:2.2.0')
}

bootRun {
    environment SPRING_PROFILES_ACTIVE: environment.SPRING_PROFILES_ACTIVE ?: "development"
    jvmArgs = ["-javaagent:"+configurations.aspect.asPath]

}

Answer 1

@Mauravan你是正确的创建一个bean并使用它与autowire。

但是你可以在Spring中有很多方法来创建bean。

1st：在春天，你使用Autowire在类中注入对象，而不是在CDI中使用Inject。

/**
 * {@link MailSender} capable of sending out mails.
 */
@Autowired
private MailSender mailSender;

第二：您可以使用@Service或@Component注释创建bean并将其注入发送电子邮件的类中，除非

return new EmailCommand(title, user.getEmail());

第3名：毕竟你会拥有它

@Service
class EmailCommand {
    @Autowired
    private MailSender mailSender;

    @Async
    public void send(SimpleMailMessage message) {
        this.mailSender.send(message);
    }
}

这只是一个例子......

让@Configurable正常工作

1 个答案: