Question

我有一个以下枚举类型：

public enum SearchLocationTypes {REGISTRATION, WORKPLACE}

我为这个enum + formatter注释工厂创建了两个：converter和formatter（以防万一）。

格式化：

public class SearchLocationTypesFormatter implements Formatter<SearchLocationTypes> {
    @Override
    public String print(SearchLocationTypes type, Locale locale) {
        String strType = "";
        switch(type) {
            case REGISTRATION: 
                strType = "rg";
                break;
            case WORKPLACE:
                strType = "wp";
                break;
        }
        return strType;
    }

    @Override
    public SearchLocationTypes parse(String strType, Locale locale) throws ParseException {
        if(strType.equals("rg")) return SearchLocationTypes.REGISTRATION;
        if(strType.equals("wp")) return SearchLocationTypes.WORKPLACE;
        else throw new IllegalArgumentException();
    }
}

厂：

public class SearchLocationTypesAnnotationFormatterFactory 
implements AnnotationFormatterFactory<SearchLocationTypesFormat> {

    @Override
    public Set<Class<?>> getFieldTypes() {
        return new HashSet<Class<?>>(Arrays.asList(new Class<?>[] {SearchLocationTypes.class}));
    }

    @Override
    public Printer<?> getPrinter(SearchLocationTypesFormat a, Class<?> type) {
        return new SearchLocationTypesFormatter();
    }

    @Override
    public Parser<?> getParser(SearchLocationTypesFormat a, Class<?> type) {
        return new SearchLocationTypesFormatter();
    }

}

注释：

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
public @interface SearchLocationTypesFormat {}

转换器：

public class SearchLocationTypesConverter implements Converter<SearchLocationTypes, String> {

    @Override
    public String convert(SearchLocationTypes type) {
        String strType = "";
        switch(type) {
            case REGISTRATION: 
                strType = "rg";
                break;
            case WORKPLACE:
                strType = "wp";
                break;
        }
        return strType;
    }

}

servlet.xml的一部分：

<mvc:annotation-driven conversion-service="conversionService"  />
<bean id="conversionService"
    class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <bean class="ru.riado.web.format.SearchLocationTypesConverter" />
        </set>
    </property>
    <property name="formatters">
        <set>
            <bean class="ru.riado.web.format.SearchLocationTypesAnnotationFormatterFactory" />
            <bean class="ru.riado.web.format.SearchSortTypesFormatter" />
        </set>
    </property>
</bean>

当我从JSP调用以下代码时，一切都按预期工作。
实施例：假设我有一个bean“form”，其属性“locType”设置为“REGISTRATION”。

public class Form {
  @SearchLocationTypesFormat
  private SearchLocationTypes locType;
  // setters and getters
}

现在，我正在使用以下代码，其输出为“rg”：

<s:eval expression="form.locType">

但是弹簧形式不会将它的值转换为“rg”。而不是将其设置为“REGISTRATION”，就像它使用默认转换器一样。我试图关闭默认转换，但这没有帮助。

有谁能告诉我我在这里缺少什么？

Answer 1

我首先重构你的代码：

public enum SearchLocationTypes {
  REGISTRATION("rg"),
  WORKPLACE("wp");

  private String abbr;

  SearchLocationTypes(String abbr) {
    this.abbr = abbr;
  }

  @Override
  public String toString() {
    return abbr;
  }

  public static SearchLocationTypes fromString(String from) {
    for (SearchLocationTypes locType : SearchLocationTypes.values()) {
      if (locType.abbr.equals(from)) {
        return locType;
      }
    }
    throw new IllegalArgumentException();
  }
}

和Formatter（以及Converter与print方法相同）：

public class SearchLocationTypesFormatter implements
    Formatter<SearchLocationTypes> {
  @Override
  public String print(SearchLocationTypes type, Locale locale) {
    return type == null ? "" : type.toString();
  }

  @Override
  public SearchLocationTypes parse(String strType, Locale locale)
      throws ParseException {
    return SearchLocationTypes.fromString(strType);
  }
}

现在，您可以在jsp中使用form:radiobuttons或form:options：

<form:select path="locType">
  <form:options />
</form:select>

默认情况下，表单值是枚举的名称（），表单标签是枚举的toString（）（来自https://jira.springsource.org/browse/SPR-3389）。

我无法查看，但现在尝试<s:eval expression="form.locType">。

Spring 3.1.1表单标签不使用formatter / converter

1 个答案: