Question

在我的项目中，我有一些问题覆盖了Spring MVC的Mustache for here的默认配置。

我的理解是，当模板找到一个被解析为null的变量时，默认情况下mustache.java会引发MustacheException。我希望Mustache编译器将这些值解析为空字符串。

我尝试使用nullValue(String nullValue)函数设置适当的行为，如下面的代码所示，但它似乎没有任何效果。我理解显而易见的解决方案是将phoneNumber属性设置为空值，但我真的很想理解为什么这个特定代码不起作用。

您将在下面找到我用来测试此行为的代码，其中包含一个Employee实体，该实体故意不在其构造函数中实例化其phoneNumber成员值以及相关代码片段。 / p>

提前致谢！

的pom.xml

<dependency>
  <groupId>com.github.sps.mustache</groupId>
  <artifactId>mustache-spring-view</artifactId>
  <version>1.3</version>
</dependency>
<!-- jmustache -->
<dependency>
  <groupId>com.samskivert</groupId>
  <artifactId>jmustache</artifactId>
  <version>1.10</version>
</dependency>
<!-- mustache.java -->
<dependency>
  <groupId>com.github.spullara.mustache.java</groupId>
  <artifactId>compiler</artifactId>
  <version>0.8.17</version>
</dependency>

Employee.java

public class Employee {
  protected String firstName;
  protected String lastName;
  protected String phoneNumber;

  public Employee() { }
  public Employee(firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }

  // Getter and Setters for all attributes
}

getViewResolver

@Bean
public ViewResolver getViewResolver(ResourceLoader resourceLoader) {
  MustacheViewResolver mustacheViewResolver = new MustacheViewResolver();
  mustacheViewResolver.setPrefix("/src/main/resources/templates/");
  mustacheViewResolver.setSuffix(".html");
  mustacheViewResolver.setCache(false);
  mustacheViewResolver.setContentType("text/html;charset=utf-8");

  JMustacheTemplateLoader mustacheTemplateLoader = new JMustacheTemplateLoader();
  mustacheTemplateLoader.setResourceLoader(resourceLoader);

  JMustacheTemplateFactory mustacheTemplateFactory = new JMustacheTemplateFactory();
  mustacheTemplateFactory.setTemplateLoader(mustacheTemplateLoader);

  mustacheTemplateFactory.setCompiler(Mustache.compiler().nullValue(" "));

  mustacheViewResolver.setTemplateFactory(mustacheTemplateFactory);
  return mustacheViewResolver;
}

EmployeeController

@Autowired
private EmployeeRepository repository;

...

@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public String viewEmployee(@PathVariable Long id, Model model) {
  model.addAttribute("employee", repository.findOne(id));
  return "employee_view";
}

employee_view.html

<!DOCTYPE html>
<html>
  <body>
  <ul>
    {{#employee}}
    <li> First Name: {{firstName}}
    <li> Last Name: {{lastName}}
    <li> Phone Number: {{phoneNumber}}
    {{/employee}}
  </ul>
  </body>
</html>

Answer 1

我现在正在使用spring-boot.1.2.5.RELEASE。

如果您查看MyCustomValidationRule的源代码（第73行~78行），请致电告诉您org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration无法配置!!!

可能你应该新建一个你自己的defaultValue来修复它。或者您可以使用spring-boot-starter或freemarker代替它。

或者，当ApplicationContext启动时，您可以通过velocity来破解它。

像这样：

BeanPostProcessor

祝你好运！

Answer 2

你试过这个吗？

<!DOCTYPE html>
<html>
<body>
<ul>
{{#employee}}
  <li> First Name: {{firstName}}
  <li> Last Name: {{lastName}}
  <li> Phone Number:{{#phoneNumber}} {{phoneNumber}} {{/phoneNumber}}     {{^phoneNumber}} NA {{/phoneNumber}}
{{/employee}}
</ul>
</body>

Answer 3

我设法通过创建自定义Mustache自动配置来实现。首先排除默认的MustacheAutoConfiguration。

@SpringBootApplication
@EnableAutoConfiguration(exclude = MustacheAutoConfiguration.class)
public class Application extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

然后为Mustache创建新的自动配置。

@Configuration
@EnableConfigurationProperties({MustacheProperties.class})
public class LayoutAutoConfiguration extends MustacheAutoConfiguration {

    public LayoutAutoConfiguration(MustacheProperties mustache, Environment environment, ApplicationContext applicationContext) {
        super(mustache, environment, applicationContext);
    }

    @Override
    public Mustache.Compiler mustacheCompiler(Mustache.TemplateLoader mustacheTemplateLoader) {
        return super.mustacheCompiler(mustacheTemplateLoader).defaultValue("");
    }
}

Spring Boot 1.5.1.RELEASE with jmustache 1.13。

Spring MVC和Mustache - 更改Mustache的编译器默认空值

3 个答案: