如何去掉保存mongodb数据时出现的_class字段
作者:huas_mcfeng
这篇文章主要给大家介绍了如何去掉保存mongodb数据时出现的_class字段,文中通过代码示例给大家介绍的非常详细,对大家的学习或工作有一定的帮助,需要的朋友可以参考下
配置如下:
application.yml文件内容如下
spring: data: mongodb: host: 192.168.9.234 #指定MongoDB服务地址 port: 27017 #指定端口,默认就为27017 database: blog #指定使用的数据库(集合) authentication-database: admin # 登录认证的逻辑库名 username: admin #用户名 password: 123456 #密码 main: banner-mode: off server: port: 8080
公共类如下
IBasicDao类:
package com.zingrow.blog.common; import com.mongodb.client.result.DeleteResult; import com.mongodb.client.result.UpdateResult; import org.springframework.data.mongodb.core.MongoTemplate; import org.springframework.data.mongodb.core.query.Query; import org.springframework.data.mongodb.core.query.Update; import java.util.List; public interface IBasicDao<T> { /** * 查询数据 * * @param query * @return */ List<T> find(Query query); /** * 分页查询 * * @param query * @param start * @param size * @return */ List<T> findList(Query query, int start, int size); /** * 根据ID查询 * * @param id * @return */ T findOne(String id); /** * 插入一条数据 * * @param entity */ void insert(T entity); /** * 更新数据 * * @param query * @param update * @return */ UpdateResult update(Query query, Update update); /** * 根据实体类删除数据 * * @param entity * @return */ DeleteResult delete(T entity); /** * 根据query删除数据 * * @param query * @return */ DeleteResult remove(Query query); long count(); long count(Query query); void save(T entity); List<T> findAll(); List<T> findByKeyAndValue(String key, String Value); List<T> findByKeyAndValue(String key, String Value, int start, int limit); void upsert(Query query, Update update); MongoTemplate getMongoTemplate(); }
其实现类BasicDao内容如下
package com.zingrow.blog.common; import com.mongodb.client.result.DeleteResult; import com.mongodb.client.result.UpdateResult; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.domain.Sort; import org.springframework.data.mongodb.core.MongoTemplate; import org.springframework.data.mongodb.core.query.Criteria; import org.springframework.data.mongodb.core.query.Query; import org.springframework.data.mongodb.core.query.Update; import java.lang.reflect.ParameterizedType; import java.util.List; public class BasicDao<T> implements IBasicDao<T> { private Class<T> clazz; public BasicDao() { ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass(); clazz = (Class<T>) type.getActualTypeArguments()[0]; } @Autowired private MongoTemplate mongoTemplate; @Override public List<T> find(Query query) { return mongoTemplate.find(query, clazz); } @Override public List<T> findList(Query query, int start, int size) { query.with(Sort.by(new Sort.Order(Sort.Direction.ASC, "_id"))) .skip(start) .limit(size); return mongoTemplate.find(query, clazz); } @Override public T findOne(String id) { Query query = new Query(); query.addCriteria(new Criteria("_id").is(id)); return mongoTemplate.findOne(query, clazz); } @Override public void insert(T entity) { mongoTemplate.insert(entity); } @Override public UpdateResult update(Query query, Update update) { return mongoTemplate.updateMulti(query, update, clazz); } @Override public DeleteResult delete(T entity) { return mongoTemplate.remove(entity); } @Override public DeleteResult remove(Query query) { return mongoTemplate.remove(query, clazz); } public DeleteResult remove(String id) { Query query = new Query(); query.addCriteria(Criteria.where("id").is(id)); return mongoTemplate.remove(query, clazz); } @Override public long count() { Query query = new Query(); return mongoTemplate.count(query, clazz); } @Override public long count(Query query) { return mongoTemplate.count(query, clazz); } @Override public void save(T entity) { mongoTemplate.save(entity); } @Override public List<T> findAll() { Query query = new Query(); return find(query); } @Override public List<T> findByKeyAndValue(String key, String Value) { Query query = new Query(Criteria.where(key).is(Value)); return mongoTemplate.find(query, clazz); } @Override public List<T> findByKeyAndValue(String key, String Value, int start, int limit) { Query query = new Query(Criteria.where(key).is(Value)); query.skip(start).limit(limit); return mongoTemplate.find(query, clazz); } @Override public void upsert(Query query, Update update) { mongoTemplate.upsert(query, update, clazz); } @Override public MongoTemplate getMongoTemplate() { return mongoTemplate; } }
实体类(Article)如下
package com.zingrow.blog.entity; import org.springframework.data.annotation.Id; import org.springframework.data.mongodb.core.mapping.Document; @Document(collection = "article") public class Article { @Id private String id; private String title; private String classify; private String content; private String time; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getClassify() { return classify; } public void setClassify(String classify) { this.classify = classify; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } public String getTime() { return time; } public void setTime(String time) { this.time = time; } public Article(String id, String title, String classify, String content, String time) { this.id = id; this.title = title; this.classify = classify; this.content = content; this.time = time; } @Override public String toString() { return "Article{" + "id='" + id + '\'' + ", title='" + title + '\'' + ", classify='" + classify + '\'' + ", content='" + content + '\'' + ", time='" + time + '\'' + '}'; } }
服务实现类(ArticleServiceImpl)
package com.zingrow.blog.service; import com.zingrow.blog.common.BasicDao; import com.zingrow.blog.entity.Article; import org.springframework.stereotype.Service; @Service public class ArticleServiceImpl extends BasicDao<Article> { }
控制类(ArticleController)
package com.zingrow.blog.contronller; import com.zingrow.blog.entity.Article; import com.zingrow.blog.service.ArticleServiceImpl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.CrossOrigin; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController @CrossOrigin(value = "*", maxAge = 300) public class ArticleController { @Autowired private ArticleServiceImpl articleService; @GetMapping("add") public String add(Article article) { articleService.insert(article); return article.toString(); } }
成功插入数据后
发现多了个_class字段,解决办法如下
新建配置类(MongoConfig)
package com.zingrow.blog.config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.mongodb.MongoDatabaseFactory; import org.springframework.data.mongodb.core.MongoTemplate; import org.springframework.data.mongodb.core.convert.DbRefResolver; import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver; import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper; import org.springframework.data.mongodb.core.convert.MappingMongoConverter; import org.springframework.data.mongodb.core.mapping.MongoMappingContext; @Configuration public class MongoConfig { @Bean(name = "mongoTemplate") public MongoTemplate mongoTemplate(MongoDatabaseFactory mongoDatabaseFactory, MongoMappingContext mongoMappingContext) { DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDatabaseFactory); MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, mongoMappingContext); //去掉_class字段 mappingConverter.setTypeMapper(new DefaultMongoTypeMapper(null)); return new MongoTemplate(mongoDatabaseFactory,mappingConverter); } }
结果如下
失败案例:
新建配置类(在实际项目引入时可能会报MongoDbFactory已被废弃)
@Configuration public class MongoConfig { @Bean public MappingMongoConverter mappingMongoConverter(MongoDbFactory factory, MongoMappingContext context, BeanFactory beanFactory) { DbRefResolver dbRefResolver = new DefaultDbRefResolver(factory); MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, context); try { mappingConverter.setCustomConversions(beanFactory.getBean(CustomConversions.class)); } catch (NoSuchBeanDefinitionException ignore) { } // Don't save _class to mongo mappingConverter.setTypeMapper(new DefaultMongoTypeMapper(null)); return mappingConverter;
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