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springmvc注解配置例子的实例

 
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来源:http://itlab.idcquan.com/Java/Hibernate/962179.html 

弃用了struts,用spring mvc框架做了几个项目,感觉都不错,而且使用了注解方式,可以省掉一大堆配置文件。本文主要介绍使用注解方式配置的spring mvc,之前写的 spring3.0 mvc和rest小例子没有介绍到数据层的内容,现在这一篇补上。下面开始贴代码。

    文中用的框架版本:spring 3,hibernate 3,没有的,自己上网下。

    web.xml配置:

    

<?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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd " id=" WebApp_ID " version= " 2.5 ">
    <display - name> s3h3 </display - name>
    <context - param>
    <param - name> contextConfigLocation </param - name>
    <param - value> classpath:applicationContext * .xml </param - value>
    </context - param>
    <listener>
    <listener - class> org.springframework.web.context.ContextLoaderListener </listener - class>
    </listener>
    <servlet>
    <servlet - name> spring </servlet - name>
    <servlet - class> org.springframework.web.servlet.DispatcherServlet </servlet - class>
    <load - on - startup> </load - on - startup>
    </servlet>
    <servlet - mapping>
    <servlet - name> spring </servlet - name>
    <!-- 这里在配成spring,下边也要写一个名为spring - servlet.xml的文件,主要用来配置它的controller -->
    <url - pattern>* . do </url - pattern>
    </servlet - mapping>
    <welcome - file - list>
    <welcome - file> index.jsp </welcome - file>
    </welcome - file - list>
</web - app>

 

    spring-servlet,主要配置controller的信息

    

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd">
    <context:annotation-config />
    <!-- 把标记了@Controller注解的类转换为bean -->
    <context:component-scan base-package="com.mvc.controller" />
    <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    p:prefix="/WEB-INF/view/" p:suffix=".jsp" />
    <bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver"
    p:defaultEncoding="utf-8" />
</beans>

 

    applicationContext.xml代码

 

<?xml version="1.0"encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    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
    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
    <context:annotation-config />
    <context:component-scan base-package="com.mvc" /> <!-- 自动扫描所有注解该路径 -->
    <context:property-placeholder location="classpath:/hibernate.properties" />
    <bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
    <props>
    <prop key="hibernate.dialect">${dataSource.dialect} </prop>
    <prop key="hibernate.hbm2ddl.auto">${dataSource.hbm2ddl.auto} </prop>
    <prop key="hibernate.hbm2ddl.auto">update </prop>
    </props>
    </property>
    <property name="packagesToScan">
    <list>
    <value> com.mvc.entity </value> <!-- 扫描实体类,也就是平时所说的model -->
    </list>
    </property>
    </bean>
    <bean id="transactionManager"
    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
    <property name="dataSource" ref="dataSource" />
    </bean>
    <bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName"        value="${dataSource.driverClassName}" />
    <property name="url" value="${dataSource.url}" />
    <property name="username" value="${dataSource.username}" />
    <property name="password" value="${dataSource.password}" />
    </bean>

     <!-- Dao的实现 -->
    <bean id="entityDao"   class="com.mvc.dao.EntityDaoImpl">
    <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager" />
    <tx:annotation-driven mode="aspectj" />
    <aop:aspectj-autoproxy />
</beans>

 

 

    hibernate.properties数据库连接配置

   

dataSource.password=123
dataSource.username=root
dataSource.databaseName=test
dataSource.driverClassName=com.mysql.jdbc.Driver
dataSource.dialect=org.hibernate.dialect.MySQL5Dialect
dataSource.serverName=localhost:3306
dataSource.url=jdbc:mysql://localhost:3306/test
dataSource.properties=user=${dataSource.username};
databaseName=${dataSource.databaseName};
serverName=${dataSource.serverName};
password=${dataSource.password}
dataSource.hbm2ddl.auto=update

 

    配置已经完成,下面开始例子

    先在数据库建表,例子用的是mysql数据库

    

CREATE TABLE `test`.`student` (
    `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
    `name` varchar(45) NOT NULL,
    `psw` varchar(45) NOT NULL,
    PRIMARY KEY (`id`)
    )

 

    建好表后,生成实体类

    

packagecom.mvc.entity;
    import java.io.Serializable;
    import javax.persistence.Basic;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;
    @Entity
    @Table(name="student")
    public class Student implements Serializable {
    private static final long serialVersionUID=1L;
    @Id
    @Basic(optional=false)
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id", nullable=false)
    private Integer id;
    @Column(name="name")
    private String user;
    @Column(name="psw")
    private String psw;
    public Integer getId() {
    return id;
    }
    public void setId(Integer id) {
    this.id=id;
    }
    public String getUser() {
    return user;
    }
    public void setUser(String user) {
    this.user=user;
    }
    public String getPsw() {
    return psw;
    }
    public void setPsw(String psw) {
    this.psw= psw;
    }
    }

 

    Dao层实现

    

package com.mvc.dao;
    import java.util.List;
    public interface EntityDao {
    public List<Object> createQuery(final String queryString);
    public Object save(final Object model);
    public void update(final Object model);
    public void delete(final Object model);
    }
    package com.mvc.dao;
    import java.util.List;
    import org.hibernate.Query;
    import org.springframework.orm.hibernate3.HibernateCallback;
    import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
    public class EntityDaoImpl extends HibernateDaoSupport implements EntityDao {
    public List<Object> createQuery(final String queryString) {
    return (List<Object>) getHibernateTemplate()。execute(
    new HibernateCallback<Object>() {
    public Object doInHibernate(org.hibernate.Session session)
    throws org.hibernate.HibernateException {
    Query query=session.createQuery(queryString);
    List<Object> rows=query.list();
    return rows;
    }
    });
    }
    public Object save(final Object model) {
    return getHibernateTemplate()。execute(
    new HibernateCallback<Object>() {
    public Object doInHibernate(org.hibernate.Session session)
    throws org.hibernate.HibernateException {
    session.save(model);
    return null;
    }
    });
    }
    public void update(final Object model) {
    getHibernateTemplate()。execute(new HibernateCallback<Object>() {
    public Object doInHibernate(org.hibernate.Session session)
    throws org.hibernate.HibernateException {
    session.update(model);
    return null;
    }
    });
    }
    public void delete(final Object model) {
    getHibernateTemplate()。execute(new HibernateCallback<Object>() {
    public Object doInHibernate(org.hibernate.Session session)
    throws org.hibernate.HibernateException {
    session.delete(model);
    return null;
    }
    });
    }
    }

 

    Dao在applicationContext.xml注入

    

<bean id="entityDao" class="com.mvc.dao.EntityDaoImpl">
    <property name="sessionFactory" ref="sessionFactory" />
    </bean>

 

    Dao只有一个类的实现,直接供其它service层调用,如果你想更换为其它的Dao实现,也只需修改这里的配置就行了。

    开始写view页面,WEB-INF/view下新建页面student.jsp,WEB-INF/view这路径是在spring-servlet.xml文件配置的,你可以配置成其它,也可以多个路径。student.jsp代码

    

<% @ page language="java"contentType="text/html;charset=UTF-8"
    pageEncoding="UTF-8"%>
    <% @ include file="/include/head.jsp"%>
    <! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title> 添加 </title>
    <script language="javascript" src="<%=request.getContextPath()%><!--
    /script/jquery.min.js">
    // --></script>
    <style><!--
    table{ border-collapse:collapse; }
    td{ border:1px solid #f00; }
    --></style><style mce_bogus="1">table
    student_add.jsp
    <% @ page language="java"contentType="text/html;charset=UTF-8"
    pageEncoding="UTF-8"%>
    <% @ include file="/include/head.jsp"%>
    <! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title> 学生添加 </title>
    <mce:script type="text/javascript"><!--
    function turnback(){
    window.location.href="<%=request.getContextPath()%>/student.do";
    }
    // --> </mce:script>
    </head>
    <body>
    <form method="post" action="<%=request.getContextPath()%>/student.do?method=save">
    <div><c:out value="${addstate}"></c:out></div>
    <table>
    <tr><td> 姓名 </td><td><input id="user" name="user" type="text" /></td></tr>
    <tr><td> 密码 </td><td><input id="psw" name="psw" type="text" /></td></tr>
    <tr><td colSpan="2" align="center"><input type="submit" value="提交"/><input type="button" onclick="turnback()" value="返回" /> </td></tr>
    </table>
    </form>
    </body>
    </html>

 

 

 controller类实现,只需把注解写上,spring就会自动帮你找到相应的bean,相应的注解标记意义,不明白的,可以自己查下@Service,@Controller,@Entity等等的内容。

    

package com.mvc.controller;
    import java.util.List;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.servlet.ModelAndView;
    import com.mvc.entity.Student;
    import com.mvc.service.StudentService;
    @Controller
    @RequestMapping( " /student.do " )
    public class StudentController {
    protected final transient Log log=LogFactory
    .getLog(StudentController.class);
    @Autowired
    private StudentService studentService;
    public StudentController(){
    }
    @RequestMapping
    public String load(ModelMap modelMap){
    List<Object> list=studentService.getStudentList();
    modelMap.put("list", list);
    return "student";
    }
    @RequestMapping(params="method=add")
    public String add(HttpServletRequest request, ModelMap modelMap) throws Exception{
    return "student_add";
    }
    @RequestMapping(params="method=save")
    public String save(HttpServletRequest request, ModelMap modelMap){
    String user=request.getParameter("user");
    String psw=request.getParameter("psw");
    Student st=new Student();
    st.setUser(user);
    st.setPsw(psw);
    try{
    studentService.save(st);
    modelMap.put("addstate", "添加成功");
    }
    catch(Exception e){
    log.error(e.getMessage());
    modelMap.put("addstate", "添加失败");
    }
    return "student_add";
    }
    @RequestMapping(params="method=del")
    public void del(@RequestParam("id") String id, HttpServletResponse response){
    try{
    Student st=new Student();
    st.setId(Integer.valueOf(id));
    studentService.delete(st);
    response.getWriter()。print("{\"del\":\"true\"}");
    }
    catch(Exception e){
    log.error(e.getMessage());
    e.printStackTrace();
    }
    }
    }

 

    service类实现

   

 package com.mvc.service;
    import java.util.List;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    import com.mvc.dao.EntityDao;
    import com.mvc.entity.Student;
    @Service
    public class StudentService {
    @Autowired
    private EntityDao entityDao;
    @Transactional
    public List<Object> getStudentList(){
    StringBuffer sff=new StringBuffer();
    sff.append("select a from ")。append(Student.class.getSimpleName())。append(" a ");
    List<Object> list=entityDao.createQuery(sff.toString());
    return list;
    }
    public void save(Student st){
    entityDao.save(st);
    }
    public void delete(Object obj){
    entityDao.delete(obj);
    }
    }

 

    OK,例子写完。有其它业务内容,只需直接新建view,并实现相应comtroller和service就行了,配置和dao层的内容基本不变,也就是每次只需写jsp(view),controller和service调用dao就行了。

    怎样,看了这个,spring mvc是不是比ssh实现更方便灵活。

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