spring3 + MyBatis的定製類型控制器

Question

我有Set<String>類型的某些字段一個POJO。 我想堅持他們的分貝爲JSON，所以我創建一個自定義類型控制器，但是當我試圖堅持我的錯誤：沒有發現類型處理器....

testSave(it.infora.suap.service.MailMessageServiceTest): nested exception is org.apache.ibatis.executor.ExecutorException: There was no TypeHandler found for parameter recipients_to of statement it.infora.suap.persistence.MailMessageMapper.insertEmailMessage 

參數recipients_to在一個Set<String>

，這是我的自定義類型處理器類：

public class SetTypeHandler implements TypeHandler<Set<String>>{ 


    @Override 
    public void setParameter(PreparedStatement ps, int columnIndex, Set<String> parameter, JdbcType jt) throws SQLException { 
    ps.setString(columnIndex, serializeToJson(parameter)); 
    } 

    @Override 
    public Set<String> getResult(ResultSet rs, String columnName) throws SQLException { 
     return deserializeFromJson(rs.getString(columnName)); 
    } 

    @Override 
    public Set<String> getResult(ResultSet rs, int columnIndex) throws SQLException { 
     return deserializeFromJson(rs.getString(columnIndex)); 
    } 

    @Override 
    public Set<String> getResult(CallableStatement cs, int columnIndex) throws SQLException { 
     return deserializeFromJson(cs.getString(columnIndex)); 
    } 

    private String serializeToJson(Set<String> parameter){ 
     Gson gson = new Gson(); 
     return gson.toJson(parameter); 
    } 

    private Set<String> deserializeFromJson(String value){ 
     Gson gson = new Gson(); 
     Type collectionType = new TypeToken<Set<String>>(){}.getType(); 
     Set<String> result = gson.fromJson(value, collectionType); 

     return result;  
    } 

} 

有什麼不對？我使用註釋映射器接口而不是mapper.xml

感謝

安德烈

Answer 1

我發現了一些信息here和here，但似乎你錯過了

@MappedTypes(Set.class) 
public class SetTypeHandler implements TypeHandler<Set<String>>{