Spring MVC automatically injects enumerated types into objects

spring MVC cannot be injected directly if there is an enumerated type in an object, because it only implements automatic conversion injection of 1 basic data type, but it also provides an extensible interface that can be extended according to your needs. Here is an example:

First: This is an enumeration class:

/** 
 *  News category  
 * @author: ShangJianguo 
 * 2014-6-11  In the morning 10:51:07 
 */ 
public enum ENews { 
 
  company("0"), //  Corporate news  
  industry("1");//  Industry news  
 
  private final String value; 
   
  private ENews(String v) { 
    this.value = v; 
  } 
   
  public String toString() { 
    return this.value; 
  } 
 
  public static ENews get(int v) { 
    String str = String.valueOf(v); 
    return get(str); 
  } 
 
  public static ENews get(String str) { 
    for (ENews e : values()) { 
      if(e.toString().equals(str)) { 
        return e; 
      } 
    } 
    return null; 
  } 
} 

The following is an entity class:

public class News { 
   
  private ENews type; 
  private String adminuid; 
  private String title; 
  private String summary; 
  private String author; 
  private String origin; 
  private String originurl; 
  private String content; 
 
    //  omit setter and getter methods  
} 

Here is the controller layer:

@RequestMapping(value="/news/update", method=RequestMethod.POST) 
@ResponseBody 
public boolean edit_update(Map<String, Object> model,HttpServletRequest request,News news){ 
  String adminid = getAdminid(); 
  news.init(adminSO.getAdminByAdminid(adminid).getUid()); 
  if (news != null) { 
    if (newsSO.update(news)) { 
      return true; 
    } 
  } 
  return false; 
} 

However, at this point the program is not able to run properly, the real point is the following, write an enumerated transformation class (Converter) :

public class StringToENewsConverter implements Converter<String, ENews>{ 
 
  /* (non-Javadoc) 
   * @see com.fasterxml.jackson.databind.util.Converter#convert(java.lang.Object) 
   * @author: ShangJianguo 
   * 2014-6-12  In the afternoon 4:56:30 
   */ 
  @Override 
  public ENews convert(String source) { 
    String value = source.trim(); 
    if ("".equals(value)) { 
      return null; 
    } 
    return ENews.get(Integer.parseInt(source)); 
 
  } 
} 

Then configure in the configuration file for spring mvc:

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"> 
  <property name="converters"> 
    <set> 
      <bean class="com.ngenius.core.converters.StringToENewsConverter" /> 
       
    </set> 
  </property> 
</bean> 

In this way, spring can run when injecting the fields of the object, directly converting the content received from the front end to ENews type for encapsulation.