mongodb与spring mvc 整合

1.pom文件添加对mongodb的倚赖

<dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
        <version>3.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-mongodb</artifactId>
        <version>${data.mongodb}</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-mongodb-cross-store</artifactId>
        <version>${data.mongodb}</version>
    </dependency>
    <dependency>
       <groupId>org.springframework.data</groupId>
       <artifactId>spring-data-mongodb-log4j</artifactId>
       <version>${data.mongodb}</version>
    </dependency>

2.applicationContext.xml

<?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:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- 扫描 -->
    <context:component-scan base-package="cn.com.xxx.mongodb"/>

    <!-- 引入mongodb的相关配置 -->
    <import resource="classpath:spring-mongodb.xml"/>

</beans>

4.mongodb.properties

#数据库名称
mongo.dbname = test
#用户名
mongo.username = root
mongo.credentials=root:000000@test
#密码
mongo.password = 000000
#主机
mongo.host = 127.0.0.1
#端口号
mongo.port= 27017
#一个线程变为可用的最大阻塞数
mongo.connectionsPerHost= 8
#线程队列数,它以上面connectionsPerHost值相乘的结果就是线程队列最大值
mongo.threadsAllowedToBlockForConnectionMultiplier= 4
#连接超时时间（毫秒）
mongo.connectTimeout= 1500
#最大等待时间
mongo.maxWaitTime= 1500
#自动重连
mongo.autoConnectRetry= true
#scoket保持活动
mongo.socketKeepAlive= true
#scoket超时时间
mongo.socketTimeout=1500
#读写分离
mongo.slaveOk=true

3.spring-mongodb.xml

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mongo="http://www.springframework.org/schema/data/mongo"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/data/mongo
          http://www.springframework.org/schema/data/mongo/spring-mongo.xsd
          http://www.springframework.org/schema/aop
          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
          http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- 加载mongodb的属性配置文件 -->
    <context:property-placeholder location="classpath:mongodb.properties" />

    <!-- 定义mongo对象，对应的是mongodb官方jar包中的Mongo，replica-set设置集群副本的ip地址和端口 -->
<!--
    <mongo:mongo id="mongo" host="${mongo.host}" port="${mongo.port}" >

    <mongo:client-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>
    -->
　　<!-- 我们使用的mongodb的版本是3.X,所以在构造这段话的时候要根据 Mongo  类的构造函数来构造，不同版本可能会造成构造函数的不同-->
    <mongo:mongo-client id="mongo" host="${mongo.host}" port="${mongo.port}" credentials="${mongo.credentials}">

        <mongo:client-options
        connections-per-host="${mongo.connectionsPerHost}"
        threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"
        connect-timeout="${mongo.connectTimeout}"
        max-wait-time="${mongo.maxWaitTime}"
        socket-keep-alive="${mongo.socketKeepAlive}"
        socket-timeout="${mongo.socketTimeout}"
       />
    </mongo:mongo-client>

    <!-- 用户验证 -->
    <bean id="userCredentials" class="org.springframework.data.authentication.UserCredentials">
        <constructor-arg name="username" value="${mongo.username}" />
        <constructor-arg name="password" value="${mongo.password}" />
    </bean>
    <!-- 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 -->
    <bean id="mongoDbFactory"
        class="org.springframework.data.mongodb.core.SimpleMongoDbFactory">
        <constructor-arg ref="mongo" />
        <constructor-arg value="${mongo.dbname}" />
        <!-- <constructor-arg ref="userCredentials" /> -->
    </bean>

    <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>

    <!-- collection的映射 -->
    <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>
    <bean id="audience" class="cn.com.xxx.mongodb.aop.Audience"/>

    <aop:config proxy-target-class="true">
        <aop:aspect ref="audience">
            <aop:pointcut id="performance" expression="execution(* cn.com.mongodb.service.impl.*.*(..))"/>

            <aop:before pointcut-ref="performance" method="takeSeats"/>
            <aop:before pointcut-ref="performance" method="turnOffCellPhones"/>
            <aop:around pointcut-ref="performance" method="around"/>
            <aop:after-returning pointcut-ref="performance" method="applaud"/>
            <aop:after-throwing pointcut-ref="performance" method="demandRefund"/>
            <aop:after pointcut-ref="performance" method="after"/>
        </aop:aspect>
    </aop:config>
</beans>

5.为了使javabean对象与mongodb对象相互转化，本人借鉴别人的例子，稍加改动, 主要是应对数据库表字段的命名是含 _ 的这种方式，首先需要约定在生成java pojo的时候，每个字段上面要加上@Field注解（方便利用反射来让两者之间相互转换）

@Document(collection="item_info")
public class ItemInfo implements Serializable {

    private static final long serialVersionUID = 1L;
    private Oid _id;
    @Field(value="item_id")
    private String itemId;
    @Field(value="item_name")
    private String itemName;
    @Field(value="price")
    private Double price;
    @Field(value="desc")
    private String desc;

    public Oid get_id() {
        return _id;
    }

    public void set_id(Oid _id) {
        this._id = _id;
    }

    public String getItemId() {
        return itemId;
    }

    public void setItemId(String itemId) {
        this.itemId = itemId;
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    @Override
    public String toString() {
        return "ItemInfo [_id=" + _id + ", itemId=" + itemId + ", itemName="
                + itemName + ", price=" + price + ", desc=" + desc + "]";
    }

实现java对象与DBObject对象之间的相互转化

public class BeanUtil {

      /**
       * 把实体bean对象转换成DBObject
       * @param bean
       * @return
       * @throws IllegalArgumentException
       * @throws IllegalAccessException
       */
      public static <T> DBObject bean2DBObject(T bean) throws IllegalArgumentException,
          IllegalAccessException {
        if (bean == null) {
          return null;
        }
        DBObject dbObject = new BasicDBObject();
        // 获取对象对应类中的所有属性域
        Field[] fields = bean.getClass().getDeclaredFields();

        // 获取所有注解
        for (Field field : fields) {
            org.springframework.data.mongodb.core.mapping.Field anno = field.getAnnotation(org.springframework.data.mongodb.core.mapping.Field.class);
          // 获取属性名
          String varName = field.getName();

          if("serialVersionUID".equals(varName) || "_id".equals(varName)){
              continue;
          }

          // 获取注解的值
          varName = anno.value();
          // 修改访问控制权限
          boolean accessFlag = field.isAccessible();
          if (!accessFlag) {
            field.setAccessible(true);
          }
          Object param = field.get(bean);
          if (param == null) {
            continue;
          } else if (param instanceof Integer) {//判断变量的类型
            int value = ((Integer) param).intValue();
            dbObject.put(varName, value);
          } else if (param instanceof String) {
            String value = (String) param;
            dbObject.put(varName, value);
          } else if (param instanceof Double) {
            double value = ((Double) param).doubleValue();
            dbObject.put(varName, value);
          } else if (param instanceof Float) {
            float value = ((Float) param).floatValue();
            dbObject.put(varName, value);
          } else if (param instanceof Long) {
            long value = ((Long) param).longValue();
            dbObject.put(varName, value);
          } else if (param instanceof Boolean) {
            boolean value = ((Boolean) param).booleanValue();
            dbObject.put(varName, value);
          } else if (param instanceof Date) {
            Date value = (Date) param;
            dbObject.put(varName, value);
          }
          // 恢复访问控制权限
          field.setAccessible(accessFlag);
        }

        return dbObject;
      }

      /**
       * 把DBObject转换成bean对象
       * @param dbObject
       * @param bean
       * @return
       * @throws IllegalAccessException
       * @throws InvocationTargetException
       * @throws NoSuchMethodException
       */
      public static <T> T dbObject2Bean(DBObject dbObject, T bean) throws IllegalAccessException,
          InvocationTargetException, NoSuchMethodException {
        if (bean == null) {
          return null;
        }
        Field[] fields = bean.getClass().getDeclaredFields();
        for (Field field : fields) {
          String varName = field.getName();
          org.springframework.data.mongodb.core.mapping.Field anno = field.getAnnotation(org.springframework.data.mongodb.core.mapping.Field.class);
          if("serialVersionUID".equals(varName) || "_id".equals(varName)){
              continue;
          }

          String fieldName = anno.value();
          Object object = dbObject.get(fieldName);
          if (object != null) {
            BeanUtils.setProperty(bean, varName, object);
          }
        }
        return bean;
      }
}

好了，准备工作就做好了

相应的Service与实现方法

public interface ItemInfoService {

    // 查询
    public List<ItemInfo> getItemInfo(JSONObject json) throws Exception;

    // 保存
    public int save(ItemInfo itemInfo) throws Exception;

    // 更新
    public void update(ItemInfo intemInfo) throws Exception;
}

@Service(value="itemInfoService")
public class ItemInfoServiceImpl implements ItemInfoService {

    @Autowired
    private MongoTemplate mongoTemplate;
    private final static String COLLECTION_NAME = "item_info"; 

    @Override
    @SuppressWarnings("static-access")
    public List<ItemInfo> getItemInfo(JSONObject json) throws Exception{
        List<ItemInfo> list = new ArrayList<ItemInfo>();
        // 判断查询的json中传递过来的参数
        DBObject query = new BasicDBObject();
        // item_id,item_name,price,desc
        if(json.has("item_id")){

            query.put("item_id", json.getString("item_id"));
        }else if(json.has("item_name")){
            query.put("item_name", json.getString("item_name"));
        }

        DBCursor results = mongoTemplate.getCollection("item_info").find(query);
        if(null != results){
            Iterator<DBObject> iterator = results.iterator();
            while(iterator.hasNext()){
                //Document doc = (Document) iterator.next();
                BasicDBObject obj = (BasicDBObject) iterator.next();
                //System.out.println(obj.toJson());
                // json 字符串
                String objStr = obj.toString();
                //JSONObject itemInfoJson = new JSONObject().fromObject(objStr);
                //itemInfoJson.put("_id", itemInfoJson.getJSONObject("_id").getString("$oid"));
                ItemInfo itemInfo = new ItemInfo();
                itemInfo = BeanUtil.dbObject2Bean(obj, itemInfo);
                list.add(itemInfo);
            }
        }

        return list;
    }

    @Override
    public int save(ItemInfo itemInfo) throws Exception {
        itemInfo.setDesc("1111");
        itemInfo.setItemId("i1234567890123");
        itemInfo.setItemName("item_name_xx");
        itemInfo.setPrice(110.0);

        DBCollection collection = this.mongoTemplate.getCollection("item_info");
        int result = 0;
        DBObject iteminfoObj = BeanUtil.bean2DBObject(itemInfo);

        //iteminfoObj.removeField("serialVersionUID");
        //result = collection.insert(iteminfoObj).getN();
        WriteResult writeResult = collection.save(iteminfoObj);
        result = writeResult.getN();
        return result;
    }

    @Override
    public void update(ItemInfo intemInfo) throws Exception {

        DBCollection collection = this.mongoTemplate.getCollection(COLLECTION_NAME);
        ItemInfo queryItemInfo = new ItemInfo();
        queryItemInfo.setItemId(intemInfo.getItemId());
        DBObject itemInfoObj = BeanUtil.bean2DBObject(intemInfo);
        DBObject query =  BeanUtil.bean2DBObject(queryItemInfo);
        collection.update(query, itemInfoObj);
    }

}

junit test

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:applicationContext.xml")
public class ItemInfoServiceTest {

    @Autowired
    private ItemInfoService itemInfoService;

    @Ignore
    @Test
    public void testSave(){
        ItemInfo itemInfo = new ItemInfo();
        try {
            this.itemInfoService.save(itemInfo);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Ignore
    @Test
    public void testGetItemInfo(){
        List<ItemInfo> list = new ArrayList<ItemInfo>();
        JSONObject json = new JSONObject();
        //json.put("item_id", "47a09d51-bf24-442b-9076-4701dcb614b9");
        json.put("item_id", "i1234567890123");
        try {
            list = this.itemInfoService.getItemInfo(json);
            if(null != list && list.size() > 0){
                //System.out.println(list.get(0).toString());
                for (ItemInfo itemInfo : list) {
                    //itemInfo.setItemName("======");
                    this.itemInfoService.getItemInfo(json);
                }
            }
            System.out.println(1 / 0);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void testUpdate(){
        JSONObject json = new JSONObject();
        //json.put("item_id", "47a09d51-bf24-442b-9076-4701dcb614b9");
        json.put("item_id", "i1234567890123");
        List<ItemInfo> list = new ArrayList<ItemInfo>();
        try {
            list = this.itemInfoService.getItemInfo(json);

            if(null != list && list.size() > 0){
                for (ItemInfo itemInfo : list) {

                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

OK , 测试完成。