spring mongodb中去掉_class列
在spring for mongodb中，会发现当一个pojo序列化为一个document时，会出现如下情况：
public class User {
String username;
String password;
}
转变为mongodb 时
MongoOperations mongoOperation = (MongoOperations)ctx.getBean("mongoTemplate"); User user = new User("abc", "password123"); mongoOperation.save(user, "users");
会发现document中，多了个_class属性：
{ "_class" : "com.abc.user.User", ...................}
多了_class的意义，在下面这个链接有很好的解答：
http://stackoverflow.com/questions/6810488/spring-data-mongodb-mappingmongoconverter-remove-class/
，其实就是说，为了在把document转换成Java对象时能够转换到具体的子类.
要去掉的方法简单：DefaultMongoTypeMapper类的构造函数的第一个参数是Type在MongoDB中名字. 设置为null的话就不会在保存时自动添加_class属性.所以需要覆写
MappingMongoConverter。
1）用注解的方法取消：
@Configurationpublic class SpringMongoConfig{ public @BeanMongoDbFactory mongoDbFactory() throws Exception {return new SimpleMongoDbFactory(new Mongo(), "database");} public @BeanMongoTemplate mongoTemplate() throws Exception { MappingMongoConverter converter = new MappingMongoConverter(mongoDbFactory(), new MongoMappingContext());converter.setTypeMapper(new DefaultMongoTypeMapper(null)); MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory(), converter); return mongoTemplate; } 2）XML配置文件 <mongo:mongo host="localhost" port="27017" /><mongo:db-factory dbname="database" /><bean id="mappingContext"class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" /><bean id="defaultMongoTypeMapper"class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"><constructor-arg name="typeKey"><null/></constructor-arg> </bean><bean id="mappingMongoConverter"class="org.springframework.data.mongodb.core.convert.MappingMongoConverter"><constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /><constructor-arg name="mappingContext" ref="mappingContext" /><property name="typeMapper" ref="defaultMongoTypeMapper" /> </bean><bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"><constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /><constructor-arg name="mongoConverter" ref="mappingMongoConverter" /> </bean>
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