1、Maven導入依賴
<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>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<!-- 設置變量:用於統一管理Library的版本 -->
<javax.version>7.0</javax.version>
<javax.servlet.version>3.1.0</javax.servlet.version>
<javax.servlet.jstl.version>1.2</javax.servlet.jstl.version>
<log4j.version>1.2.16</log4j.version>
<org.slf4j.version>1.7.1</org.slf4j.version>
<junit.version>4.12</junit.version>
<org.htmlparser.version>2.1</org.htmlparser.version>
<org.springframework.version>4.1.1.RELEASE</org.springframework.version>
<spring-data-mongodb.version>1.7.1.RELEASE</spring-data-mongodb.version>
<org.mongodb.version>3.0.3</org.mongodb.version>
<javax.validation.version>1.1.0.Final</javax.validation.version>
<org.hibernate.version>5.0.2.Final</org.hibernate.version>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>${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相關 -->
<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>
我們這裏使用的Spring基礎框架是4.1.x版本,使用1.7.x版本的Spring Data MongoDB對MongoDB進行CRUD操作。在使用Spring Data MongoDB框架時,需要使用到JSR-303 Validation驗證標準。於是我們在這裏引入 javax.validation的Jar和Hibernate Validator。值得注意的是,這裏使用到的Hibernate Validator,不是我們要引入Hibernate框架,而僅僅是引入JSR-303的實現。
2、Spring對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的工廠,通過它來取得mongo實例,dbname爲mongodb的數據庫名,沒有的話會自動創建 -->
<mongo:db-factory dbname="diary" mongo-ref="mongo" />
<!-- mongodb的主要操作對象,所有對mongodb的增刪改查的操作都是通過它完成 -->
<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
這裏通過mongo:mongo標籤來配置數據庫的地址和端口,此標籤默認的bean名稱爲mongo。如果你還需要配置MongoDB的其它參數,可以使用mongo:options標籤。
<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/>
當然,在設置MongoDB參數時,也可以使用Java屬性文件。
<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
當你設置完MongoDB的基本參數後,你還得設置一個mongo數據工廠。此過程是由mongo:db-factory完成的,此標籤的主要作用是通過它來取得mongo實例,dbname爲diary的數據庫名,沒有的話會自動創建。這裏mongo-ref引用的就是上文mongo:mongo這個bean。
mongo:db-factory標籤默認的bean名稱爲mongoDbFactory。
<mongo:db-factory dbname="diary" mongo-ref="mongo" />
如果你的DB需要用戶名和密碼才能訪問的話,也可以通過mongo:db-factory來設置。
<mongo:db-factory id="anotherMongoDbFactory"
host="localhost"
port="27017"
dbname="database"
username="benben"
password="123456"/>
2.4 MongoTemplate
設置完mongo:db-factory後,我們就可以設置MongoTemplate了。MongoTemplate是Spring對MongoDB進行CRUD操作的主要工具類,其作用類似Spring整合Hibernate時的HibernateTemplate。
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
</bean>
到這裏爲止,我們獲取到MongoTemplate,配置就告一段落。
3、實體類與映射
新建一個文章Article實體類,對應數據庫的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註解將實體類與數據庫的集合相互映射。collection的值是數據庫的集合名稱。
加上@Document註解後,Spring的自動掃描功能就能識別出你的映射的實體類了。
3.2 _id屬性
MongoDB需要我們爲所有的文檔都加上’_id’屬性,其實就相當於SQL中的主鍵。所以我們在創建實體類時,也需要爲實體類加一個id映射。
Spring Data MongoDB提供了多種方式,在實體類中映射_id
- 直接在實體類中定義一個名爲id的字符串屬性
private String id;
- 爲實體類中的任意屬性加上@Id註解
@Id private String id;
@Id private String x;
如果沒特殊的需要,我們最好是使用@Id註解爲標註名爲id的屬性作爲_id,像我們demo中的實體類一樣。這樣程序的可讀性高點。
3.3 @Field
實體類的非_id屬性,不加任何註解。可以同名的映射到數據庫的集合中。如果你非得跟數據庫中的不一樣,Spring也提供了@Field爲實現。
如,我們想把上文中的link屬性,保存到集合的url屬性中。
@Field("url")
private String link;
4、DAO基類及使用
4.1 IBaseDao接口及其實現
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> {
/**
* 獲取查詢數據的數量
* @Title: findCount
* @Description: TODO
* @param @param query
* @param @return
* @return Long
* @throws
*/
public Long findCount(Query query);
/**
* 查詢數據
* @Title: find
* @Description: TODO
* @param @param query
* @param @return
* @return List<T>
* @throws
*/
public List<T> find(Query query);
/**
* 分頁查詢數據
* @Title: findList
* @Description: TODO
* @param @param start
* @param @param limit
* @param @return
* @return List<T>
* @throws
*/
public List<T> findList(int start, int limit);
/**
* 根據id獲取單個數據
* @Title: findOne
* @Description: TODO
* @param @param id
* @param @return
* @return T
* @throws
*/
public T findOne(String id);
/**
* 插入一條數據
* @Title: insert
* @Description: TODO
* @param @param entity
* @return void
* @throws
*/
public void insert(T entity);
/**
* 更新數據
* @Title: update
* @Description: TODO
* @param @param entity
* @param @throws Exception
* @return void
* @throws
*/
public void update(T entity) throws Exception;
/**
* 更新數據
* @Title: update
* @Description: TODO
* @param @param query
* @param @param update
* @return void
* @throws
*/
public void update(Query query,Update update);
/**
* 刪除數據
* @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接口實現
* @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基類實現上,我們自己寫了一個MongoFactory的工具類。此類主要是在做更新的時候使用。在update(T entity)方法中,做到類似HibernateTemplate一樣,通過MongoFactory獲取到entity的id及entity值不爲空的屬性,以id作爲條件,更新這些屬性。
相關的兩個輔助工具類如下:
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輔助類
* @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;
/**
* 把實體對象轉爲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;
/**
* 實體參數映射工具
* @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";
/**
* 獲取查詢的參數
*
* @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實體類的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>{
/**
* 根據link屬性獲取一條數據
* @Title: findOneByLink
* @Description: TODO
* @param @param link
* @param @return
* @return Article
* @throws
*/
public Article findOneByLink(String link);
/**
* 根據link屬性與title屬性進行或運算獲取一條數據
* @Title: findOneByLinkOrTitle
* @Description: TODO
* @param @param link
* @param @param title
* @param @return
* @return Article
* @throws
*/
public Article findOneByLinkOrTitle(String link,String title);
/**
* 根據state屬性獲取createTime爲最新的數據
* @Title: findNewestByState
* @Description: TODO
* @param @param state
* @param @return
* @return Article
* @throws
*/
public Article findNewestByState(Integer state);
/**
* 根據state屬性獲取數據的數量
* @Title: findNewestByState
* @Description: TODO
* @param @param state
* @param @return
* @return Article
* @throws
*/
public Long findCount(Integer state);
/**
* 分頁獲取數據
* @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實現
* @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());// 從skip開始,取多少條記錄
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);
}
}
分頁輔助類:
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;
/**
* 分頁輔助類
* @ClassName: Pagination
* @Description: TODO
* @author 潘廣偉
* @date 2015年8月10日 下午4:15:51
*
*/
public class Pagination {
/** 每頁數量 */
private Integer pageSize;
/** 開始位置 */
private Integer skip;
/** 當前頁 */
private Integer currentPage;
/** 總頁數 */
private Long totalPage;
/** 查詢到的總數據量 */
private Long totalNumber;
/** 數據集 */
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、測試及小優化
5.1 測試數據插入及_class屬性的移除
單元測試代碼:
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("標題1");
article.setLink("http://benben.ren");
article.setState(1);
article.setCreateTime(factory.now());
articleDao.insert(article);
} catch (Exception e) {
e.printStackTrace();
}
}
}
測試結果:
我們看到測試結果中,除了我們想要保存的屬性值外,還多了一個_class的屬性。這是由Spring默認幫我們加到集合中的。它可能並不是我們需要的,且這個數據還佔着存儲空間。如果我們想把這個屬性去掉,可以通過配置MappingMongoConverter的typeMapper來實現。
<bean id="mappingContext"
class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />
<!-- 默認Mongodb類型映射 -->
<bean id="defaultMongoTypeMapper"
class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
<constructor-arg name="typeKey">
<null /><!-- 這裏設置爲空,可以把 spring data mongodb 多餘保存的_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的主要操作對象,所有對mongodb的增刪改查的操作都是通過它完成 -->
<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 測試簡單查詢及類型轉換器
單元測試代碼:
@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();
}
}
測試結果:
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)
這裏報無法將java.util.Date轉換成java.sql.Timestamp。原因是我們實體類中的時間是Timestamp類型的,而Spring Data默認的時間類型是Date。
這裏我們需要一個轉換器。
package ren.benben.diary.api.converter;
import java.sql.Timestamp;
import java.util.Date;
import org.springframework.core.convert.converter.Converter;
/**
* Timestamp轉換器
* 將Date轉換成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轉換器到Spring中。由於我們在上面做移除_class屬性優化的時候,使用到了MappingMongoConverter,而MongoTemplate只有一個mongoConverter屬性,所以我們需要將DefaultMongoTypeMapper引入新的Converter中。
<!-- 默認Mongodb類型映射 -->
<bean id="defaultMongoTypeMapper" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
<constructor-arg name="typeKey">
<null /><!-- 這裏設置爲空,可以把 spring data mongodb 多餘保存的_class字段去掉 -->
</constructor-arg>
</bean>
<!-- 轉換器: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的主要操作對象,所有對mongodb的增刪改查的操作都是通過它完成 -->
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
<constructor-arg name="mongoConverter" ref="mongoConverter" />
</bean>
再次測試得到結果:
5.3 使用分頁查詢
使用代碼(Service層使用)
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;
}
這裏是獲取文章總數,獲取currentPage頁count條數據。並按creatTime降序排序。
具體就不詳細展開了。
5.4 注意
BaseDao中做更新數據的時候,我們使用到了java映射機制來獲取實體對象的值,並更新這些值。如果更新的屬性值不是太多的話,建議不要使用BaseDao的update(T entity)方法,因爲通過映射獲取值沒有直接獲取來得快。
6、鏈接
Mongodb的簡單使用:
http://blog.csdn.net/jrainbow/article/details/39163843
Spring MVC的簡單用法:
http://blog.csdn.net/jrainbow/article/details/46618077
HibernateTemplate與HibernateDaoSupport:
http://blog.csdn.net/jrainbow/article/details/10526617