Spring整合MongoDB
2015-08-10 17:08
721 查看
1、Maven导入依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>ren.benben</groupId> <artifactId>diary</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>diary Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <!-- 设置变量:用于统一管理Library的版本 --> <javax.version>7.0</javax.version> <javax.servlet.version>3.1.0</javax.servlet.version> <javax.servlet.jstl.version>1.2</javax.servlet.jstl.version> <log4j.version>1.2.16</log4j.version> <org.slf4j.version>1.7.1</org.slf4j.version> <junit.version>4.12</junit.version> <org.htmlparser.version>2.1</org.htmlparser.version> <org.springframework.version>4.1.1.RELEASE</org.springframework.version> <spring-data-mongodb.version>1.7.1.RELEASE</spring-data-mongodb.version> <org.mongodb.version>3.0.3</org.mongodb.version> <javax.validation.version>1.1.0.Final</javax.validation.version> <org.hibernate.version>5.0.2.Final</org.hibernate.version> </properties> <dependencies> <dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>${javax.version}</version> <scope>provided</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>${javax.servlet.jstl.version}</version> <scope>runtime</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>${javax.servlet.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-jdk14</artifactId> <version>${org.slf4j.version}</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.htmlparser</groupId> <artifactId>htmlparser</artifactId> <version>${org.htmlparser.version}</version> </dependency> <!-- spring framework --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${org.springframework.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${org.springframework.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-mongodb</artifactId> <version>${spring-data-mongodb.version}</version> </dependency> <!-- javax.validation相关 --> <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>${javax.validation.version}</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>${org.hibernate.version}</version> </dependency> </dependencies> <build> <finalName>diary</finalName> </build> </project>
我们这里使用的Spring基础框架是4.1.x版本，使用1.7.x版本的Spring Data MongoDB对MongoDB进行CRUD操作。在使用Spring Data MongoDB框架时，需要使用到JSR-303 Validation验证标准。于是我们在这里引入 javax.validation的Jar和Hibernate Validator。值得注意的是，这里使用到的Hibernate Validator，不是我们要引入Hibernate框架，而仅仅是引入JSR-303的实现。
2、Spring对MongoDB的配置
2.1 我的配置
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:task="http://www.springframework.org/schema/task" xmlns:mongo="http://www.springframework.org/schema/data/mongo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.7.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.1.xsd"> <context:component-scan base-package="ren.benben.diary" /> <mongo:mongo host="127.0.0.1" port="27017" /> <!-- mongo的工厂，通过它来取得mongo实例,dbname为mongodb的数据库名，没有的话会自动创建 --> <mongo:db-factory dbname="diary" mongo-ref="mongo" /> <!-- mongodb的主要操作对象，所有对mongodb的增删改查的操作都是通过它完成 --> <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> </bean> <context:annotation-config /> </beans>
上面是我使用的配置。
2.2 mongo:mongo
这里通过mongo:mongo标签来配置数据库的地址和端口,此标签默认的bean名称为mongo。如果你还需要配置MongoDB的其它参数，可以使用mongo:options标签。<mongo:mongo host="localhost" port="27017"> <mongo:options connections-per-host="8" threads-allowed-to-block-for-connection-multiplier="4" connect-timeout="1000" max-wait-time="1500}" auto-connect-retry="true" socket-keep-alive="true" socket-timeout="1500" slave-ok="true" write-number="1" write-timeout="0" write-fsync="true"/> </mongo:mongo/>
当然，在设置MongoDB参数时，也可以使用Java属性文件。
<context:property-placeholder location="classpath:/com/myapp/mongodb/config/mongo.properties"/>
<mongo:mongo host="${mongo.host}" port="${mongo.port}">
<mongo:options
connections-per-host="${mongo.connectionsPerHost}"
threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
connect-timeout="${mongo.connectTimeout}"
max-wait-time="${mongo.maxWaitTime}"
auto-connect-retry="${mongo.autoConnectRetry}"
socket-keep-alive="${mongo.socketKeepAlive}"
socket-timeout="${mongo.socketTimeout}"
slave-ok="${mongo.slaveOk}"
write-number="1"
write-timeout="0"
write-fsync="true"/>
</mongo:mongo>2.3 mongo:db-factory
当你设置完MongoDB的基本参数后，你还得设置一个mongo数据工厂。此过程是由mongo:db-factory完成的，此标签的主要作用是通过它来取得mongo实例,dbname为diary的数据库名，没有的话会自动创建。这里mongo-ref引用的就是上文mongo:mongo这个bean。mongo:db-factory标签默认的bean名称为mongoDbFactory。
<mongo:db-factory dbname="diary" mongo-ref="mongo" />
如果你的DB需要用户名和密码才能访问的话，也可以通过mongo:db-factory来设置。
<mongo:db-factory id="anotherMongoDbFactory" host="localhost" port="27017" dbname="database" username="benben" password="123456"/>
2.4 MongoTemplate
设置完mongo:db-factory后，我们就可以设置MongoTemplate了。MongoTemplate是Spring对MongoDB进行CRUD操作的主要工具类，其作用类似Spring整合Hibernate时的HibernateTemplate。<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> </bean>
到这里为止，我们获取到MongoTemplate，配置就告一段落。
3、实体类与映射
新建一个文章Article实体类，对应数据库的article集合。package ren.benben.diary.article.model;
import java.sql.Timestamp;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
/**
* 文章
* @ClassName: Article
* @Description: TODO
* @author 笨笨
* @date 2015年7月29日 下午2:19:58
*
*/
@Document(collection = "article")
public class Article {
@Id
private String id;
private String title;
private String descript;
private String link;
private String[] tags;
private Timestamp createTime;
private Timestamp updateTime;
private Integer state;
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 getDescript() {
return descript;
}
public void setDescript(String descript) {
this.descript = descript;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
public String[] getTags() {
return tags;
}
public void setTags(String[] tags) {
this.tags = tags;
}
public Timestamp getCreateTime() {
return createTime;
}
public void setCreateTime(Timestamp createTime) {
this.createTime = createTime;
}
public Integer getState() {
return state;
}
public void setState(Integer state) {
this.state = state;
}
public Timestamp getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Timestamp updateTime) {
this.updateTime = updateTime;
}
}3.1 @Document
使用@Document注解将实体类与数据库的集合相互映射。collection的值是数据库的集合名称。加上@Document注解后，Spring的自动扫描功能就能识别出你的映射的实体类了。
3.2 _id属性
MongoDB需要我们为所有的文档都加上’_id’属性，其实就相当于SQL中的主键。所以我们在创建实体类时，也需要为实体类加一个id映射。Spring Data MongoDB提供了多种方式，在实体类中映射_id
直接在实体类中定义一个名为id的字符串属性
private String id;
为实体类中的任意属性加上@Id注解
@Id private String id;
@Id private String x;
如果没特殊的需要，我们最好是使用@Id注解为标注名为id的属性作为_id，像我们demo中的实体类一样。这样程序的可读性高点。
3.3 @Field
实体类的非_id属性，不加任何注解。可以同名的映射到数据库的集合中。如果你非得跟数据库中的不一样，Spring也提供了@Field为实现。如，我们想把上文中的link属性，保存到集合的url属性中。
@Field("url")
private String link;4、DAO基类及使用
4.1 IBaseDao接口及其实现
package ren.benben.diary.api;
import java.util.List;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
/**
* IBaseDao接口
* @ClassName: IBaseDao
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午3:15:40
*
* @param <T>
*/
public interface IBaseDao<T> {
/**
* 获取查询数据的数量
* @Title: findCount
* @Description: TODO
* @param @param query
* @param @return
* @return Long
* @throws
*/
public Long findCount(Query query);
/**
* 查询数据
* @Title: find
* @Description: TODO
* @param @param query
* @param @return
* @return List<T>
* @throws
*/
public List<T> find(Query query);
/**
* 分页查询数据
* @Title: findList
* @Description: TODO
* @param @param start
* @param @param limit
* @param @return
* @return List<T>
* @throws
*/
public List<T> findList(int start, int limit);
/**
* 根据id获取单个数据
* @Title: findOne
* @Description: TODO
* @param @param id
* @param @return
* @return T
* @throws
*/
public T findOne(String id);
/**
* 插入一条数据
* @Title: insert
* @Description: TODO
* @param @param entity
* @return void
* @throws
*/
public void insert(T entity);
/**
* 更新数据
* @Title: update
* @Description: TODO
* @param @param entity
* @param @throws Exception
* @return void
* @throws
*/
public void update(T entity) throws Exception;
/**
* 更新数据
* @Title: update
* @Description: TODO
* @param @param query
* @param @param update
* @return void
* @throws
*/
public void update(Query query,Update update);
/**
* 删除数据
* @Title: remove
* @Description: TODO
* @param @param entity
* @return void
* @throws
*/
public void remove(T entity);
}package ren.benben.diary.api;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import org.springframework.data.domain.Sort.Order;
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 ren.benben.diary.api.util.MongoFactory;
/**
* IBaseDao接口实现
* @ClassName: BaseDao
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午3:57:18
*
* @param <T>
*/
public class BaseDao<T> implements IBaseDao<T> {
private Class<T> clazz;
public BaseDao() {
ParameterizedType type = (ParameterizedType) getClass()
.getGenericSuperclass();
clazz = (Class<T>) type.getActualTypeArguments()[0];
}
@Autowired
private MongoTemplate mongoTemplate;
@Autowired
private MongoFactory mongoFactory;
public List<T> find(Query query){
return mongoTemplate.find(query, clazz);
}
public List<T> findList(int skip, int limit) {
Query query = new Query();
query.with(new Sort(new Order(Direction.ASC, "_id")));
query.skip(skip).limit(limit);
return find(query);
}
public T findOne(String id) {
Query query = new Query();
query.addCriteria(new Criteria("_id").is(id));
return mongoTemplate.findOne(query, clazz);
}
public void insert(T entity) {
mongoTemplate.insert(entity);
}
public void update(T entity) throws Exception {
Map<String, Object> map = mongoFactory.converObjectToParams(entity);
Query query = new Query();
query.addCriteria(new Criteria("_id").is(map.get("id")));
Update update = (Update) map.get("update");
this.update(query, update);
}
public void update(Query query,Update update){
mongoTemplate.updateFirst(query, update, clazz);
}
public Long findCount(Query query){
return mongoTemplate.count(query, clazz);
}
public void remove(T entity){
mongoTemplate.remove(entity);
}
public MongoTemplate getMongoTemplate() {
return mongoTemplate;
}
}在DAO基类实现上，我们自己写了一个MongoFactory的工具类。此类主要是在做更新的时候使用。在update(T entity)方法中，做到类似HibernateTemplate一样，通过MongoFactory获取到entity的id及entity值不为空的属性，以id作为条件，更新这些属性。
相关的两个辅助工具类如下：
package ren.benben.diary.api.util;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.stereotype.Component;
/**
* Mongo辅助类
* @ClassName: MongoFactory
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午4:02:07
*
*/
@Component
public class MongoFactory {
@Autowired
private ObjectParams objectParams;
/**
* 把实体对象转为MongoDB更新需要的值
* @Title: converObjectToParams
* @Description: TODO
* @param @param obj
* @param @return
* @param @throws Exception
* @return Map<String,Object>
* @throws
*/
public Map<String, Object> converObjectToParams(Object obj) throws Exception{
Map<String, Object> map = new HashMap<String, Object>();
Update update = new Update();
Map<String, String> params = objectParams.createParams(obj);
String id = params.get("id");
Set<Map.Entry<String, String>> set = params.entrySet();
for (Iterator<Map.Entry<String, String>> it = set.iterator(); it.hasNext();) {
Map.Entry<String, String> entry = (Map.Entry<String, String>) it.next();
if(!entry.getKey().equals("id")){
update.set(entry.getKey(), entry.getValue());
}
}
map.put("id", id);
map.put("update", update);
return map;
}
}package ren.benben.diary.api.util;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Component;
/**
* 实体参数映射工具
* @ClassName: ObjectParams
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午4:05:35
*
*/
@Component
public class ObjectParams {
private String javaType = "java";
/**
* 获取查询的参数
*
* @param object
* @return
* @throws Exception
*/
public Map<String, String> createParams(Object object) throws Exception {
Map<String, String> params = new HashMap<String, String>();
setIntoParams(params,object, null);
return params;
}
private void setIntoParams(Map<String, String> params,Object object, String fatherName) throws IllegalAccessException,
Exception {
Field[] fields = object.getClass().getDeclaredFields();
for (Field file : fields) {
boolean accessFlag = file.isAccessible();
file.setAccessible(true);
String name = file.getName();
Object value = file.get(object);
if(file.getType().getName().equals("java.lang.Class")){
break;
}else if(file.getType().getName().contains(javaType)){
if(fatherName != null && !fatherName.equals(" ")){
name = fatherName+"."+name;
}
if(value != null){
params.put(name, value+"");
}
}else{
if(value != null){
setIntoParams(params,file.get(object), name);
}
}
file.setAccessible(accessFlag);
}
}
}4.2 使用BaseDao
建立Article实体类的Dao。package ren.benben.diary.article.dao;
import java.util.List;
import ren.benben.diary.api.IBaseDao;
import ren.benben.diary.api.util.Pagination;
import ren.benben.diary.article.model.Article;
/**
* Article的Dao接口
* @ClassName: IArticleDao
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午4:09:25
*
*/
public interface IArticleDao extends IBaseDao<Article>{
/**
* 根据link属性获取一条数据
* @Title: findOneByLink
* @Description: TODO
* @param @param link
* @param @return
* @return Article
* @throws
*/
public Article findOneByLink(String link);
/**
* 根据link属性与title属性进行或运算获取一条数据
* @Title: findOneByLinkOrTitle
* @Description: TODO
* @param @param link
* @param @param title
* @param @return
* @return Article
* @throws
*/
public Article findOneByLinkOrTitle(String link,String title);
/**
* 根据state属性获取createTime为最新的数据
* @Title: findNewestByState
* @Description: TODO
* @param @param state
* @param @return
* @return Article
* @throws
*/
public Article findNewestByState(Integer state);
/**
* 根据state属性获取数据的数量
* @Title: findNewestByState
* @Description: TODO
* @param @param state
* @param @return
* @return Article
* @throws
*/
public Long findCount(Integer state);
/**
* 分页获取数据
* @Title: findListByPage
* @Description: TODO
* @param @param page
* @param @param state
* @param @return
* @return List<Article>
* @throws
*/
public List<Article> findListByPage(Pagination page,Integer state);
}package ren.benben.diary.article.dao.impl;
import java.util.List;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
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 org.springframework.stereotype.Repository;
import ren.benben.diary.api.BaseDao;
import ren.benben.diary.api.constant.Constant;
import ren.benben.diary.api.util.Pagination;
import ren.benben.diary.article.dao.IArticleDao;
import ren.benben.diary.article.model.Article;
/**
* Article的Dao实现
* @ClassName: ArticleDao
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午4:14:21
*
*/
@Repository
public class ArticleDao extends BaseDao<Article> implements IArticleDao {
public Article findOneByLink(String link) {
Query query = new Query(Criteria.where("link").is(link));
return getMongoTemplate().findOne(query, Article.class);
}
public Article findNewestByState(Integer state){
Query query = createQuery(state);
query.limit(1).with(new Sort(new Sort.Order(Sort.Direction.DESC,"createTime")));
List<Article> list = this.find(query);
if(list.size()>0){
return list.get(0);
}
return null;
}
public List<Article> findListByPage(Pagination page,Integer state) {
Query query = createQuery(state);
query.with(page.getSort());
query.skip(page.getSkip()).limit(page.getPageSize());// 从skip开始,取多少条记录
return this.find(query);
}
public Long findCount(Integer state){
Query query = createQuery(state);
return this.findCount(query);
}
private Query createQuery(Integer state){
Query query = new Query();
query.addCriteria(Criteria.where("state").is(state));
return query;
}
public Article findOneByLinkOrTitle(String link, String title) {
Query query = new Query(
new Criteria().orOperator(Criteria.where("title").is(title), Criteria.where("link").is(link))
);
return getMongoTemplate().findOne(query, Article.class);
}
}分页辅助类：
package ren.benben.diary.api.util;
import java.util.List;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Direction;
import ren.benben.diary.api.constant.Constant;
/**
* 分页辅助类
* @ClassName: Pagination
* @Description: TODO
* @author 潘广伟
* @date 2015年8月10日 下午4:15:51
*
*/
public class Pagination {
/** 每页数量 */
private Integer pageSize;
/** 开始位置 */
private Integer skip;
/** 当前页 */
private Integer currentPage;
/** 总页数 */
private Long totalPage;
/** 查询到的总数据量 */
private Long totalNumber;
/** 数据集 */
private List items;
/** 排序 */
private Sort sort;
public Pagination(int currentPage, Long totalNumber) {
this.pageSize = Constant.PAGE_SIZE;
this.currentPage = currentPage;
this.totalNumber = totalNumber;
this.totalPage = totalNumber / pageSize + 1;
this.skip = (currentPage - 1) * pageSize;
this.sort = new Sort(new Sort.Order(Direction.ASC, "_id"));
}
public Integer getCurrentPage() {
return currentPage;
}
public void setCurrentPage(Integer currentPage) {
this.currentPage = currentPage;
}
public Long getTotalPage() {
return totalPage;
}
public void setTotalPage(Long totalPage) {
this.totalPage = totalPage;
}
public Long getTotalNumber() {
return totalNumber;
}
public void setTotalNumber(Long totalNumber) {
this.totalNumber = totalNumber;
}
public List getItems() {
return items;
}
public void setItems(List items) {
this.items = items;
}
public Integer getPageSize() {
return pageSize;
}
public void setPageSize(Integer pageSize) {
this.pageSize = pageSize;
}
public Integer getSkip() {
return skip;
}
public void setSkip(Integer skip) {
this.skip = skip;
}
public Sort getSort() {
return sort;
}
public void setSort(String dir, boolean isAsc) {
if (isAsc) {
this.sort = new Sort(new Sort.Order(Direction.ASC, dir));
} else {
this.sort = new Sort(new Sort.Order(Direction.DESC, dir));
}
}
}5、测试及小优化
5.1 测试数据插入及_class属性的移除
单元测试代码：package diary;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import ren.benben.diary.api.util.DateFactory;
import ren.benben.diary.article.dao.IArticleDao;
import ren.benben.diary.article.model.Article;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:/applicationContext.xml")
public class MongoTest {
@Autowired private IArticleDao articleDao;
@Autowired private DateFactory factory;
@Test
public void testInsert(){
try {
Article article = new Article();
article.setTitle("标题1");
article.setLink("http://benben.ren");
article.setState(1);
article.setCreateTime(factory.now());
articleDao.insert(article);
} catch (Exception e) {
e.printStackTrace();
}
}
}测试结果：
我们看到测试结果中，除了我们想要保存的属性值外，还多了一个_class的属性。这是由Spring默认帮我们加到集合中的。它可能并不是我们需要的，且这个数据还占着存储空间。如果我们想把这个属性去掉，可以通过配置MappingMongoConverter的typeMapper来实现。
<bean id="mappingContext" class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" /> <!-- 默认Mongodb类型映射 --> <bean id="defaultMongoTypeMapper" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"> <constructor-arg name="typeKey"> <null /><!-- 这里设置为空,可以把 spring data mongodb 多余保存的_class字段去掉 --> </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> <!-- mongodb的主要操作对象，所有对mongodb的增删改查的操作都是通过它完成 --> <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> <constructor-arg name="mongoConverter" ref="mappingMongoConverter" /> </bean>
5.2 测试简单查询及类型转换器
单元测试代码：@Test
public void testFindOne() {
try {
Article article = articleDao.findOne("55c85750a192cfe9d93e1cf1");
System.out.println(article.getTitle());
System.out.println(article.getCreateTime());
} catch (Exception e) {
e.printStackTrace();
}
}测试结果：
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.util.Date to type java.sql.Timestamp at org.springframework.core.convert.support.GenericConversionService.handleConv erterNotFound(GenericConversionService.java:311) at org.springframework.core.convert.support.GenericConversionService.convert(Ge nericConversionService.java:192) at org.springframework.core.convert.support.GenericConversionService.convert(Ge nericConversionService.java:173) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPoten tiallyConvertedSimpleRead(MappingMongoConverter.java:821) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValu e(MappingMongoConverter.java:1187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.access$2 00(MappingMongoConverter.java:78) at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbP ropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1133) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getValue Internal(MappingMongoConverter.java:869) at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWith PersistentProperty(MappingMongoConverter.java:282) at org.springframework.data.mongodb.core.convert.MappingMongoConverter$1.doWith PersistentProperty(MappingMongoConverter.java:270) at org.springframework.data.mapping.model.BasicPersistentEntity.doWithPropertie s(BasicPersistentEntity.java:309) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(Map pingMongoConverter.java:270) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(Map pingMongoConverter.java:231) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(Map pingMongoConverter.java:191) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(Map pingMongoConverter.java:187) at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(Map pingMongoConverter.java:78) at org.springframework.data.mongodb.core.MongoTemplate$ReadDbObjectCallback.doW ith(MongoTemplate.java:2200) at org.springframework.data.mongodb.core.MongoTemplate.executeFindOneInternal(M ongoTemplate.java:1837) at org.springframework.data.mongodb.core.MongoTemplate.doFindOne(MongoTemplate. java:1654) at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.ja va:563) at org.springframework.data.mongodb.core.MongoTemplate.findOne(MongoTemplate.ja va:558) at ren.benben.diary.api.BaseDao.findOne(BaseDao.java:56) at diary.MongoTest.testFindOne(MongoTest.java:41) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl .java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod. java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.j ava:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.ja va:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.jav a:17) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallba cks.evaluate(RunBeforeTestMethodCallbacks.java:72) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbac ks.evaluate(RunAfterTestMethodCallbacks.java:81) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(Spr ingRepeat.java:72) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(Spr ingJUnit4ClassRunner.java:216) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(Spr ingJUnit4ClassRunner.java:82) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbac ks.evaluate(RunBeforeTestClassCallbacks.java:60) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallback s.evaluate(RunAfterTestClassCallbacks.java:67) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJU nit4ClassRunner.java:162) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestRef erence.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:3 8) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu nner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRu nner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner. java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner .java:192)
这里报无法将java.util.Date转换成java.sql.Timestamp。原因是我们实体类中的时间是Timestamp类型的，而Spring Data默认的时间类型是Date。
这里我们需要一个转换器。
package ren.benben.diary.api.converter;
import java.sql.Timestamp;
import java.util.Date;
import org.springframework.core.convert.converter.Converter;
/**
* Timestamp转换器
* 将Date转换成Timestamp
* @ClassName: TimestampConverter
* @Description: TODO
* @author 笨笨
* @date 2015年8月10日 下午4:45:19
*
*/
public class TimestampConverter implements Converter<Date, Timestamp>{
public Timestamp convert(Date date) {
if(date != null){
return new Timestamp(date.getTime());
}
return null;
}
}配置TimestampConverter转换器到Spring中。由于我们在上面做移除_class属性优化的时候，使用到了MappingMongoConverter，而MongoTemplate只有一个mongoConverter属性，所以我们需要将DefaultMongoTypeMapper引入新的Converter中。
<!-- 默认Mongodb类型映射 --> <bean id="defaultMongoTypeMapper" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"> <constructor-arg name="typeKey"> <null /><!-- 这里设置为空,可以把 spring data mongodb 多余保存的_class字段去掉 --> </constructor-arg> </bean> <!-- 转换器：1、去掉write的_class字段 2、TimestampConverter --> <mongo:mapping-converter id="mongoConverter" base-package="ren.benben.diary.api.converter" type-mapper-ref="defaultMongoTypeMapper"> <mongo:custom-converters> <mongo:converter> <bean class="ren.benben.diary.api.converter.TimestampConverter" /> </mongo:converter> </mongo:custom-converters> </mongo:mapping-converter> <!-- mongodb的主要操作对象，所有对mongodb的增删改查的操作都是通过它完成 --> <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate"> <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" /> <constructor-arg name="mongoConverter" ref="mongoConverter" /> </bean>
再次测试得到结果：
5.3 使用分页查询
使用代码（Service层使用）public Pagination findArticles(Integer currentPage, Integer state) {
Long count = articleDao.findCount(state);
Pagination page = new Pagination(currentPage, count);
page.setSort("creatTime", false);
page.setItems(articleDao.findListByPage(page, state));
return page;
}这里是获取文章总数，获取currentPage页count条数据。并按creatTime降序排序。
具体就不详细展开了。
5.4 注意
BaseDao中做更新数据的时候，我们使用到了java映射机制来获取实体对象的值，并更新这些值。如果更新的属性值不是太多的话，建议不要使用BaseDao的update(T entity)方法，因为通过映射获取值没有直接获取来得快。6、链接
Mongodb的简单使用：http://blog.csdn.net/jrainbow/article/details/39163843
Spring MVC的简单用法：
http://blog.csdn.net/jrainbow/article/details/46618077
HibernateTemplate与HibernateDaoSupport：
http://blog.csdn.net/jrainbow/article/details/10526617
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