spring经典注脚实例一 10分钟弄懂

2012-10-26

spring经典注解实例一 10分钟弄懂先来构建一个极为简单的web应用，从controller到dao。不考虑具体实现，只是

spring经典注解实例一 10分钟弄懂
先来构建一个极为简单的web应用，从controller到dao。不考虑具体实现，只是先对整体架构有一个清晰的了解。

我们将用到如下jar包：

引用

aopalliance-1.0.jar
commons-logging-1.1.1.jar
log4j-1.2.15.jar
spring-beans-2.5.6.jar
spring-context-2.5.6.jar
spring-context-support-2.5.6.jar
spring-core-2.5.6.jar
spring-tx-2.5.6.jar
spring-web-2.5.6.jar
spring-webmvc-2.5.6.jar

先看web.xml

Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<web-app
3.    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4.    xmlns="http://java.sun.com/xml/ns/javaee"
5.    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
6.    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
7.    id="WebApp_ID"
8.    version="2.5">
9.    <display-name>spring</display-name>
10.    
11.    <context-param>
12.        <param-name>webAppRootKey</param-name>
13.        <param-value>spring.webapp.root</param-value>
14.    </context-param>
15.    
16.    <context-param>
17.        <param-name>log4jConfigLocation</param-name>
18.        <param-value>classpath:log4j.xml</param-value>
19.    </context-param>
20.    <context-param>
21.        <param-name>log4fRefreshInterval</param-name>
22.        <param-value>60000</param-value>
23.    </context-param>
24.    
25.    <context-param>
26.        <param-name>contextConfigLocation</param-name>
27.        <param-value>/WEB-INF/applicationContext.xml</param-value>
28.    </context-param>
29.    
30.    <filter>
31.        <filter-name>CharacterEncodingFilter</filter-name>
32.        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
33.        <init-param>
34.            <param-name>encoding</param-name>
35.            <param-value>UTF-8</param-value>
36.        </init-param>
37.        <init-param>
38.            <param-name>forceEncoding</param-name>
39.            <param-value>true</param-value>
40.        </init-param>
41.    </filter>
42.    <filter-mapping>
43.        <filter-name>CharacterEncodingFilter</filter-name>
44.        <url-pattern>/*</url-pattern>
45.    </filter-mapping>
46.    
47.    <listener>
48.        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
49.    </listener>
50.    <listener>
51.        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
52.    </listener>
53.    
54.    <servlet>
55.        <servlet-name>spring</servlet-name>
56.        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
57.        <init-param>
58.            <param-name>contextConfigLocation</param-name>
59.            <param-value>/WEB-INF/servlet.xml</param-value>
60.        </init-param>
61.    </servlet>
62.    <servlet-mapping>
63.        <servlet-name>spring</servlet-name>
64.        <url-pattern>*.do</url-pattern>
65.    </servlet-mapping>
66.    <welcome-file-list>
67.        <welcome-file>index.html</welcome-file>
68.        <welcome-file>index.htm</welcome-file>
69.        <welcome-file>index.jsp</welcome-file>
70.        <welcome-file>default.html</welcome-file>
71.        <welcome-file>default.htm</welcome-file>
72.        <welcome-file>default.jsp</welcome-file>
73.    </welcome-file-list>
74.</web-app>
Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<web-app
3.    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4.    xmlns="http://java.sun.com/xml/ns/javaee"
5.    xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
6.    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
7.    id="WebApp_ID"
8.    version="2.5">
9.    <display-name>spring</display-name>
10.    
11.    <context-param>
12.        <param-name>webAppRootKey</param-name>
13.        <param-value>spring.webapp.root</param-value>
14.    </context-param>
15.    
16.    <context-param>
17.        <param-name>log4jConfigLocation</param-name>
18.        <param-value>classpath:log4j.xml</param-value>
19.    </context-param>
20.    <context-param>
21.        <param-name>log4fRefreshInterval</param-name>
22.        <param-value>60000</param-value>
23.    </context-param>
24.    
25.    <context-param>
26.        <param-name>contextConfigLocation</param-name>
27.        <param-value>/WEB-INF/applicationContext.xml</param-value>
28.    </context-param>
29.    
30.    <filter>
31.        <filter-name>CharacterEncodingFilter</filter-name>
32.        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
33.        <init-param>
34.            <param-name>encoding</param-name>
35.            <param-value>UTF-8</param-value>
36.        </init-param>
37.        <init-param>
38.            <param-name>forceEncoding</param-name>
39.            <param-value>true</param-value>
40.        </init-param>
41.    </filter>
42.    <filter-mapping>
43.        <filter-name>CharacterEncodingFilter</filter-name>
44.        <url-pattern>/*</url-pattern>
45.    </filter-mapping>
46.    
47.    <listener>
48.        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
49.    </listener>
50.    <listener>
51.        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
52.    </listener>
53.    
54.    <servlet>
55.        <servlet-name>spring</servlet-name>
56.        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
57.        <init-param>
58.            <param-name>contextConfigLocation</param-name>
59.            <param-value>/WEB-INF/servlet.xml</param-value>
60.        </init-param>
61.    </servlet>
62.    <servlet-mapping>
63.        <servlet-name>spring</servlet-name>
64.        <url-pattern>*.do</url-pattern>
65.    </servlet-mapping>
66.    <welcome-file-list>
67.        <welcome-file>index.html</welcome-file>
68.        <welcome-file>index.htm</welcome-file>
69.        <welcome-file>index.jsp</welcome-file>
70.        <welcome-file>default.html</welcome-file>
71.        <welcome-file>default.htm</welcome-file>
72.        <welcome-file>default.jsp</welcome-file>
73.    </welcome-file-list>
74.</web-app>
<?xml version="1.0" encoding="UTF-8"?>
<web-app
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID"
version="2.5">
<display-name>spring</display-name>

<context-param>
<param-name>webAppRootKey</param-name>
<param-value>spring.webapp.root</param-value>
</context-param>

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.xml</param-value>
</context-param>
<context-param>
<param-name>log4fRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>

<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/servlet.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>

有不少人问我，这段代码是什么：

Xml代码
1.
2.<context-param>
3.    <param-name>webAppRootKey</param-name>
4.    <param-value>spring.webapp.root</param-value>
5.</context-param>
Xml代码
1.
2.<context-param>
3.    <param-name>webAppRootKey</param-name>
4.    <param-value>spring.webapp.root</param-value>
5.</context-param>

<context-param>
<param-name>webAppRootKey</param-name>
<param-value>spring.webapp.root</param-value>
</context-param>

这是当前应用的路径变量，也就是说你可以在其他代码中使用${spring.webapp.root}指代当前应用路径。我经常用它来设置log的输出目录。
为什么要设置参数log4jConfigLocation？

Xml代码
1.
2.    <context-param>
3.        <param-name>log4jConfigLocation</param-name>
4.        <param-value>classpath:log4j.xml</param-value>
5.    </context-param>
6.    <context-param>
7.        <param-name>log4fRefreshInterval</param-name>
8.        <param-value>60000</param-value>
9.    </context-param>
Xml代码
1.
2.    <context-param>
3.        <param-name>log4jConfigLocation</param-name>
4.        <param-value>classpath:log4j.xml</param-value>
5.    </context-param>
6.    <context-param>
7.        <param-name>log4fRefreshInterval</param-name>
8.        <param-value>60000</param-value>
9.    </context-param>

<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.xml</param-value>
</context-param>
<context-param>
<param-name>log4fRefreshInterval</param-name>
<param-value>60000</param-value>
</context-param>

这是一种基本配置，spring中很多代码使用了不同的日志接口，既有log4j也有commons-logging，这里只是强制转换为log4j！并且，log4j的配置文件只能放在classpath根路径。同时，需要通过commons-logging配置将日志控制权转交给log4j。同时commons-logging.properties必须放置在classpath根路径。
commons-logging内容：

Properties代码
1.org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
Properties代码
1.org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger

最后，记得配置log4j的监听器：

Xml代码
1.<listener>
2.    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
3.</listener>
Xml代码
1.<listener>
2.    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
3.</listener>
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

接下来，我们需要配置两套配置文件，applicationContext.xml和servlet.xml。
applicationContext.xml用于对应用层面做整体控制。按照分层思想，统领service层和dao层。servlet.xml则单纯控制controller层。

Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <import
9.        resource="service.xml" />
10.    <import
11.        resource="dao.xml" />
12.</beans>
Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <import
9.        resource="service.xml" />
10.    <import
11.        resource="dao.xml" />
12.</beans>
<?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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<import
resource="service.xml" />
<import
resource="dao.xml" />
</beans>

applicationContext.xml什么都不干，它只管涉及到整体需要的配置，并且集中管理。
这里引入了两个配置文件service.xml和dao.xml分别用于业务、数据处理。
service.xml

Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <context:component-scan
9.        base-package="org.zlex.spring.service" />
10.</beans>
Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <context:component-scan
9.        base-package="org.zlex.spring.service" />
10.</beans>
<?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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan
base-package="org.zlex.spring.service" />
</beans>

注意，这里通过<context:component-scan />标签指定了业务层的基础包路径——“org.zlex.spring.service”。也就是说，业务层相关实现均在这一层。这是有必要的分层之一。
dao.xml

Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    xmlns="http://www.springframework.org/schema/beans"
4.    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5.    xmlns:aop="http://www.springframework.org/schema/aop"
6.    xmlns:context="http://www.springframework.org/schema/context"
7.    xmlns:tx="http://www.springframework.org/schema/tx"
8.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
9.        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
10.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
11.        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
12.    <context:component-scan
13.        base-package="org.zlex.spring.dao" />
14.</beans>
Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    xmlns="http://www.springframework.org/schema/beans"
4.    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5.    xmlns:aop="http://www.springframework.org/schema/aop"
6.    xmlns:context="http://www.springframework.org/schema/context"
7.    xmlns:tx="http://www.springframework.org/schema/tx"
8.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
9.        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
10.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
11.        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
12.    <context:component-scan
13.        base-package="org.zlex.spring.dao" />
14.</beans>
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<context:component-scan
base-package="org.zlex.spring.dao" />
</beans>

dao层如法炮制，包路径是"org.zlex.spring.dao"。从这个角度看，注解还是很方便的！
最后，我们看看servlet.xml

Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <context:component-scan
9.        base-package="org.zlex.spring.controller" />
10.    <bean
11.        id="urlMapping"
12.        />
13.    <bean
14.        />
15.</beans>
Xml代码
1.<?xml version="1.0" encoding="UTF-8"?>
2.<beans
3.    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.    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
7.        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
8.    <context:component-scan
9.        base-package="org.zlex.spring.controller" />
10.    <bean
11.        id="urlMapping"
12.        />
13.    <bean
14.        />
15.</beans>
<?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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan
base-package="org.zlex.spring.controller" />
<bean
id="urlMapping"
/>
<bean
/>
</beans>

包路径配置就不细说了，都是一个概念。最重要的时候后面两个配置，这将使得注解生效！
“org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping”是默认实现，可以不写，Spring容器默认会默认使用该类。
“org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter”直接关系到多动作控制器配置是否可用！
简单看一下代码结构，如图：

Account类是来存储账户信息，属于域对象，极为简单，代码如下所示：
Account.java

Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.domain;
5.
6.import java.io.Serializable;
7.
8./**
9. *
10. * @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
11. * @version 1.0
12. * @since 1.0
13. */
14.public class Account implements Serializable {
15.
16.    /**
17.     *
18.     */
19.    private static final long serialVersionUID = -533698031946372178L;
20.
21.    private String username;
22.    private String password;
23.
24.    /**
25.     * @param username
26.     * @param password
27.     */
28.    public Account(String username, String password) {
29.        this.username = username;
30.        this.password = password;
31.    }
32.
33.    /**
34.     * @return the username
35.     */
36.    public String getUsername() {
37.        return username;
38.    }
39.
40.    /**
41.     * @param username the username to set
42.     */
43.    public void setUsername(String username) {
44.        this.username = username;
45.    }
46.
47.    /**
48.     * @return the password
49.     */
50.    public String getPassword() {
51.        return password;
52.    }
53.
54.    /**
55.     * @param password the password to set
56.     */
57.    public void setPassword(String password) {
58.        this.password = password;
59.    }
60.
61.
62.}
Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.domain;
5.
6.import java.io.Serializable;
7.
8./**
9. *
10. * @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
11. * @version 1.0
12. * @since 1.0
13. */
14.public class Account implements Serializable {
15.
16.    /**
17.     *
18.     */
19.    private static final long serialVersionUID = -533698031946372178L;
20.
21.    private String username;
22.    private String password;
23.
24.    /**
25.     * @param username
26.     * @param password
27.     */
28.    public Account(String username, String password) {
29.        this.username = username;
30.        this.password = password;
31.    }
32.
33.    /**
34.     * @return the username
35.     */
36.    public String getUsername() {
37.        return username;
38.    }
39.
40.    /**
41.     * @param username the username to set
42.     */
43.    public void setUsername(String username) {
44.        this.username = username;
45.    }
46.
47.    /**
48.     * @return the password
49.     */
50.    public String getPassword() {
51.        return password;
52.    }
53.
54.    /**
55.     * @param password the password to set
56.     */
57.    public void setPassword(String password) {
58.        this.password = password;
59.    }
60.
61.
62.}
/**
* 2010-1-23
*/
package org.zlex.spring.domain;

import java.io.Serializable;

/**
*
* @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
* @version 1.0
* @since 1.0
*/
public class Account implements Serializable {

/**
*
*/
private static final long serialVersionUID = -533698031946372178L;

private String username;
private String password;

/**
* @param username
* @param password
*/
public Account(String username, String password) {
this.username = username;
this.password = password;
}

/**
* @return the username
*/
public String getUsername() {
return username;
}

/**
* @param username the username to set
*/
public void setUsername(String username) {
this.username = username;
}

/**
* @return the password
*/
public String getPassword() {
return password;
}

/**
* @param password the password to set
*/
public void setPassword(String password) {
this.password = password;
}

}

通常，在构建域对象时，需要考虑该对象可能需要进行网络传输，本地缓存，因此建议实现序列化接口Serializable
我们再来看看控制器，这就稍微复杂了一点代码如下所示：
AccountController .java

Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.controller;
5.
6.import javax.servlet.http.HttpServletRequest;
7.import javax.servlet.http.HttpServletResponse;
8.
9.import org.springframework.beans.factory.annotation.Autowired;
10.import org.springframework.stereotype.Controller;
11.import org.springframework.web.bind.ServletRequestUtils;
12.import org.springframework.web.bind.annotation.RequestMapping;
13.import org.springframework.web.bind.annotation.RequestMethod;
14.import org.zlex.spring.service.AccountService;
15.
16./**
17. *
18. * @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
19. * @version 1.0
20. * @since 1.0
21. */
22.@Controller
23.@RequestMapping("/account.do")
24.public class AccountController {
25.
26.    @Autowired
27.    private AccountService accountService;
28.
29.    @RequestMapping(method = RequestMethod.GET)
30.    public void hello(HttpServletRequest request, HttpServletResponse response)
31.            throws Exception {
32.
33.        String username = ServletRequestUtils.getRequiredStringParameter(
34.                request, "username");
35.        String password = ServletRequestUtils.getRequiredStringParameter(
36.                request, "password");
37.        System.out.println(accountService.verify(username, password));
38.    }
39.}
Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.controller;
5.
6.import javax.servlet.http.HttpServletRequest;
7.import javax.servlet.http.HttpServletResponse;
8.
9.import org.springframework.beans.factory.annotation.Autowired;
10.import org.springframework.stereotype.Controller;
11.import org.springframework.web.bind.ServletRequestUtils;
12.import org.springframework.web.bind.annotation.RequestMapping;
13.import org.springframework.web.bind.annotation.RequestMethod;
14.import org.zlex.spring.service.AccountService;
15.
16./**
17. *
18. * @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
19. * @version 1.0
20. * @since 1.0
21. */
22.@Controller
23.@RequestMapping("/account.do")
24.public class AccountController {
25.
26.    @Autowired
27.    private AccountService accountService;
28.
29.    @RequestMapping(method = RequestMethod.GET)
30.    public void hello(HttpServletRequest request, HttpServletResponse response)
31.            throws Exception {
32.
33.        String username = ServletRequestUtils.getRequiredStringParameter(
34.                request, "username");
35.        String password = ServletRequestUtils.getRequiredStringParameter(
36.                request, "password");
37.        System.out.println(accountService.verify(username, password));
38.    }
39.}
/**
* 2010-1-23
*/
package org.zlex.spring.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.ServletRequestUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.zlex.spring.service.AccountService;

/**
*
* @author <a href="mailto:zlex.dongliang@gmail.com">梁栋</a>
* @version 1.0
* @since 1.0
*/
@Controller
@RequestMapping("/account.do")
public class AccountController {

@Autowired
private AccountService accountService;

@RequestMapping(method = RequestMethod.GET)
public void hello(HttpServletRequest request, HttpServletResponse response)
throws Exception {

String username = ServletRequestUtils.getRequiredStringParameter(
request, "username");
String password = ServletRequestUtils.getRequiredStringParameter(
request, "password");
System.out.println(accountService.verify(username, password));
}
}

分段详述：

Java代码
1.@Controller
2.@RequestMapping("/account.do")
Java代码
1.@Controller
2.@RequestMapping("/account.do")
@Controller
@RequestMapping("/account.do")

这两行注解，@Controller是告诉Spring容器，这是一个控制器类，@RequestMapping("/account.do")是来定义该控制器对应的请求路径（/account.do）

Java代码

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