Spring Data集成MongoDB訪問

本文轉載自查看原文 2012-05-01 21:32 16032 MongoDB/ Spring編程/ Spring Data

Spring Source吭哧哼哧，從2011年2月開始到2011年2月終於把spring-data-mongo-1.0.1給Release出來了。從1.0.0.M1到1.0.0.M3的版本叫做Spring Data Document。1.0.0.M4開始更名為Spring Data MongoDB 1.0.0 M4，不過官網並沒有特別說明，乍一看有點莫名其妙，尤其是MongoTemplate從org.springframework.data.document.mongodb移動到org.springframework.data.mongodb.core，官網的HelloWorldExample卻還是用org.springframework.data.document.mongodb做例子，實在造成不少誤導。

-----垃圾的cnblogs，編輯了半天的東西，一下子亂了格式，要重來！-----

Spring Data Mongo需要依賴Spring Framework，因此，首先需要下載Spring Framework的jar包，新建一個Web工程，將Spring Framework的jar包引入。本文引用了如下組件：

其中，除了Spring的幾個組件包以外，還引用了MongoDB的Driver：mongo-2.7.3.jar；DWR3.0的組件dwr.jar；spring-data-mongdb-1.0.1.RELEASE.jar以及Spring Data的公共組件spring-data-commons-core-1.2.1.RELEASE.jar。需要說明的是，本文所使用的Spring Data Mongo的組件版本，需要采用Spring Framework 3.0.7及以上版本，否則程序運行會報錯。

引入上述組件后，需要修改Spring的配置文件ApplicationContext.xml文件，引入Spring Data Mongo的命名空間，並定義MongoDB的服務器地址和端口號，初始化MongoTemplate類，代碼如下

View Code

1 <? xml version="1.0" encoding="UTF-8" ?>
2
3 < beans xmlns ="http://www.springframework.org/schema/beans"
4         xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
5         xmlns:context ="http://www.springframework.org/schema/context"
6         xmlns:mongo ="http://www.springframework.org/schema/data/mongo"
7         xmlns:dwr ="http://www.directwebremoting.org/schema/spring-dwr"
8         xsi:schemaLocation ="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
9             http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
10             http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
11             http://www.directwebremoting.org/schema/spring-dwr http://www.directwebremoting.org/schema/spring-dwr-3.0.xsd" >
12
13
14
15      < context:annotation-config />
16
17      
18      < bean id ="propertyConfigurer" class ="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >
19          < property name ="locations" >
20              < list >
21                  < value >classpath:server.properties </ value >
22              </ list >
23          </ property >
24      </ bean >
25
26      < mongo:mongo host ="localhost" port ="27017" />
27      < bean id ="mongoTemplate" class ="org.springframework.data.mongodb.core.MongoTemplate" >
28          < constructor-arg ref ="mongo" />
29          < constructor-arg name ="databaseName" value ="testDb" />
30      </ bean >
31
32
33      < context:component-scan base-package ="com.ics"   use-default-filters ="false" >
34         < context:include-filter type ="regex" expression ="com.ics.bean.*" />
35         < context:include-filter type ="regex" expression ="com.ics.dao.*" />
36         < context:include-filter type ="regex" expression ="com.ics.service.*" />
37      </ context:component-scan >
38
39      < dwr:configuration >
40          < dwr:convert type ="bean" class ="com.ics.bean.HelloKitty" />
41      </ dwr:configuration >
42      < dwr:annotation-scan base-package ="com.ics.bean" scanDataTransferObject ="true" scanRemoteProxy ="true" />
43      < dwr:annotation-scan base-package ="com.ics.web.dwr" scanDataTransferObject ="false" scanRemoteProxy ="true" />
44 </ beans >

下面開始一個簡單的樣例。首先，定義一個HelloKitty bean

View Code

1 /**
2 *
3 */
4 package com.ics.bean;
5
6 import org.directwebremoting.annotations.DataTransferObject;
7
8 @DataTransferObject
9 public class HelloKitty
10 {
11      private String id;
12
13      private String name;
14
15     @Override
16      public String toString()
17     {
18          return "HelloKitty[" + "id=" + id + ", name=" + name + "]";
19     }
20
21      public String getId()
22     {
23          return id;
24     }
25
26      public void setId(String id)
27     {
28          this.id = id;
29     }
30
31      public String getName()
32     {
33          return name;
34     }
35
36      public void setName(String name)
37     {
38          this.name = name;
39     }
40 }

定義數據訪問類，定義兩個方法，一個用於在集合中插入一條記錄，另一個根據name屬性查詢一條記錄

View Code

1 /**
2 *
3 */
4 package com.ics.dao;
5
6 import org.springframework.beans.factory.annotation.Autowired;
7 import org.springframework.data.mongodb.core.MongoTemplate;
8 import org.springframework.data.mongodb.core.query.Criteria;
9 import org.springframework.data.mongodb.core.query.Query;
10
11 import com.ics.bean.HelloKitty;
12
13
14 public class HelloKittyDAO
15 {
16      /**
17      * 定義集合名稱
18       */
19      private static String HELLOKITTY = "HelloKitty";
20
21      /**
22      * 操作MongoDB的對象
23       */
24     @Autowired
25      private MongoTemplate mongoTemplate;
26
27
28      public void createHelloKitty(HelloKitty hello)
29     {
30         mongoTemplate.insert(hello, HELLOKITTY);
31     }
32
33      public HelloKitty getHelloKittyByName(String name)
34     {
35          return mongoTemplate.findOne( new Query(Criteria.where("name").is(name)), HelloKitty. class, HELLOKITTY);
36     }
37 }

簡單的Service方法

1 /**
2 *
3 */
4 package com.ics.service;
5
6 import org.springframework.beans.factory.annotation.Autowired;
7
8 import com.ics.bean.HelloKitty;
9 import com.ics.dao.HelloKittyDAO;
10
11 public class HelloKittyService
12 {
13     @Autowired
14      private HelloKittyDAO helloKittyDAO;
15
16      public String createHelloKitty(HelloKitty hello)
17     {
18         helloKittyDAO.createHelloKitty(hello);
19
20         HelloKitty ret = helloKittyDAO.getHelloKittyByName(hello.getName());
21
22          return ret == null ? "" : ret.getId();
23     }
24 }

通過DWR發布出去

1 /**
2 *
3 */
4 package com.ics.web.dwr;
5
6 import org.directwebremoting.annotations.RemoteMethod;
7 import org.directwebremoting.annotations.RemoteProxy;
8 import org.springframework.beans.factory.annotation.Autowired;
9
10 import com.ics.bean.HelloKitty;
11 import com.ics.service.HelloKittyService;
12
13 @RemoteProxy(name = "HelloKittyManage")
14 public class HelloKittyManage
15 {
16  @Autowired
17   private HelloKittyService helloKittyService;
18
19  @RemoteMethod
20   public String sayHello(HelloKitty hello)
21  {
22    return "hello " + helloKittyService.createHelloKitty(hello);
23  }
24 }

最后，在index.html訪問這個DWR方法

1 < html >
2      < head >
3          < title >hello DWR </ title >
4          < script type ="text/javascript" src ="/Mars/dwr/engine.js" ></ script >
5          < script type ="text/javascript" src ="/Mars/dwr/util.js" ></ script >
6          < script type ="text/javascript" src ="/Mars/dwr/interface/HelloKittyManage.js" ></ script >
7          < script type ="text/javascript" >
8              function sayHello()
9             {
10                  var helloworld = { " name " : " xyzz " };
11                 HelloKittyManage.sayHello(helloworld, function (data){alert(data);});
12             }
13          </ script >
14      </ head >
15      < body >
16          < h3 > Spring 3.X with DWR </ h3 >
17          < a href ="javascript:void(0);" onclick ="sayHello(); return false;" >Retrieve test data </ a >< br />
18      </ body >
19 </ html >

啟動MongoDB服務器，運行樣例程序。

在頁面點擊“Retrieve test data”，將會彈出“Hello 4f9fe5112d0182c5bc0a6c39”字樣，其中“4f9fe5112d0182c5bc0a6c39”就是剛剛插入MongoDB中自動生成的ID。So easy，：）

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