java - xml bean配置到java代码配置

Question

如何更改此 xml 配置:

<bean id="templateEngine" class="org.thymeleaf.spring3.SpringTemplateEngine">
      ...
      <property name="additionalDialects">
        <set>
          <bean class="org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect"/>
        </set>
      </property>
      ...
    </bean>

到目前为止，我有一个java代码配置，我只在这部分遇到问题:

<property name="additionalDialects">
            <set>
              <bean class="org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect"/>
            </set>
          </property>

这是我迄今为止在 java 代码中所拥有的:

   @Bean
    public SpringSecurityDialect springSecurityDialect() {
        return new SpringSecurityDialect();
    }

    @Bean 
    public SpringTemplateEngine templateEngine() {
        SpringTemplateEngine engine  =  new SpringTemplateEngine();
        engine.setTemplateResolver( templateResolver() );
        engine.setMessageSource( messageSource() );

        //DIALECTS
                Set<SpringSecurityDialect> ssdSet = new HashSet<SpringSecurityDialect>();       
                ssdSet.add( springSecurityDialect() );
                engine.setAdditionalDialects( ssdSet ); <-- this line give me this error
        return engine;
    }

这一行给我这个错误:The method setAdditionalDialects(Set<IDialect>) in the type TemplateEngine is not applicable for the arguments (Set<SpringSecurityDialect>)

Answer 1

今天我为此花了一段时间。答案在于查看 Spring Boot 源代码:

https://github.com/spring-projects/spring-boot/blob/v1.2.5.RELEASE/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafAutoConfiguration.java

@Configuration
@ConditionalOnClass({ SpringSecurityDialect.class })
protected static class ThymeleafSecurityDialectConfiguration {

    @Bean
    @ConditionalOnMissingBean
    public SpringSecurityDialect securityDialect() {
        return new SpringSecurityDialect();
    }

}

因此 Spring Boot(好吧，“org.springframework.boot:spring-boot-starter-thymeleaf”)将尝试注入(inject) org.thymeleaf.extras.springsecurity3.dialect.SpringSecurityDialect。也许它不起作用，因为我有 springsecurity4 jar。

无论如何，有一个简单的解决方法:只需执行 Spring Boot 尝试执行的操作即可。在 @Configuration 类中，只需添加 bean:

@Bean
public SpringSecurityDialect securityDialect() {
    return new SpringSecurityDialect();
}