开发框架－－谈谈对struts多模块的认识

edu.jlu.fuliang.dao.BookDAO.java:

package edu.jlu.fuliang.dao;

import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.LockMode;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import edu.jlu.fuliang.domain.Book;

/** *//**
 * Data access object (DAO) for domain model class Book.
 * 
 * @see edu.jlu.fuliang.domain.Book
 * @author MyEclipse Persistence Tools
 */

public class BookDAO extends HibernateDaoSupport ...{
    private static final Log log = LogFactory.getLog(BookDAO.class);
    // property constants
    public static final String NAME = "name";
    public static final String ISBM = "isbm";
    public static final String AUTHOR = "author";

    protected void initDao() ...{
        // do nothing
    }

    public void save(Book transientInstance) ...{
        log.debug("saving Book instance");
        try ...{
            getHibernateTemplate().save(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) ...{
            log.error("save failed", re);
            throw re;
        }
    }

    public void delete(Book persistentInstance) ...{
        log.debug("deleting Book instance");
        try ...{
            getHibernateTemplate().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) ...{
            log.error("delete failed", re);
            throw re;
        }
    }

    public Book findById(java.lang.Long id) ...{
        log.debug("getting Book instance with id: " + id);
        try ...{
            Book instance = (Book) getHibernateTemplate().get(
                    "edu.jlu.fuliang.domain.Book", id);
            return instance;
        } catch (RuntimeException re) ...{
            log.error("get failed", re);
            throw re;
        }
    }

    public List findByExample(Book instance) ...{
        log.debug("finding Book instance by example");
        try ...{
            List results = getHibernateTemplate().findByExample(instance);
            log.debug("find by example successful, result size: "
                    + results.size());
            return results;
        } catch (RuntimeException re) ...{
            log.error("find by example failed", re);
            throw re;
        }
    }

    public List findByProperty(String propertyName, Object value) ...{
        log.debug("finding Book instance with property: " + propertyName
                + ", value: " + value);
        try ...{
            String queryString = "from Book as model where model."
                    + propertyName + "= ?";
            return getHibernateTemplate().find(queryString, value);
        } catch (RuntimeException re) ...{
            log.error("find by property name failed", re);
            throw re;
        }
    }

    public List findByName(Object name) ...{
        return findByProperty(NAME, name);
    }

    public List findByIsbm(Object isbm) ...{
        return findByProperty(ISBM, isbm);
    }

    public List findByAuthor(Object author) ...{
        return findByProperty(AUTHOR, author);
    }

    public List findAll() ...{
        log.debug("finding all Book instances");
        try ...{
            String queryString = "from Book";
            return getHibernateTemplate().find(queryString);
        } catch (RuntimeException re) ...{
            log.error("find all failed", re);
            throw re;
        }
    }

    public Book merge(Book detachedInstance) ...{
        log.debug("merging Book instance");
        try ...{
            Book result = (Book) getHibernateTemplate().merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) ...{
            log.error("merge failed", re);
            throw re;
        }
    }

    public void attachDirty(Book instance) ...{
        log.debug("attaching dirty Book instance");
        try ...{
            getHibernateTemplate().saveOrUpdate(instance);
            log.debug("attach successful");
        } catch (RuntimeException re) ...{
            log.error("attach failed", re);
            throw re;
        }
    }

    public void attachClean(Book instance) ...{
        log.debug("attaching clean Book instance");
        try ...{
            getHibernateTemplate().lock(instance, LockMode.NONE);
            log.debug("attach successful");
        } catch (RuntimeException re) ...{
            log.error("attach failed", re);
            throw re;
        }
    }

    public static BookDAO getFromApplicationContext(ApplicationContext ctx) ...{
        return (BookDAO) ctx.getBean("BookDAO");
    }
}

Book.hbm.xml:

< ?xml version="1.0" encoding="utf-8"?>
< !DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
< !-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
< hibernate-mapping>
    < class name="edu.jlu.fuliang.domain.Book" table="BOOK" schema="CLASSICCARS">
        < id name="id" type="java.lang.Long">
            < column name="ID" />
            < generator class="identity" />
        < /id>
        < property name="name" type="java.lang.String">
            < column name="NAME" length="20" not-null="true" />
        < /property>
        < property name="isbm" type="java.lang.String">
            < column name="ISBM" length="20" not-null="true" unique="true" />
        < /property>
        < property name="author" type="java.lang.String">
            < column name="AUTHOR" length="15" />
        < /property>
    < /class>
< /hibernate-mapping>

下面我们配置一下Spring，我们把applicationContext.xml分成了三个，分别是applicationContext-db.xml,applicationContext-dao.xml,applicationContext-service.我们看看如何配置：

applicationContext-db.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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    < bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        < property name="driverClassName"
            value="org.apache.derby.jdbc.ClientDriver">
        < /property>
        < property name="url"
            value="jdbc:derby://localhost:1527/myeclipse;create=true">
        < /property>
        < property name="username" value="classiccars">< /property>
        < property name="password" value="myeclipse">< /property>
    < /bean>
    < bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        < property name="dataSource">
            < ref bean="dataSource" />
        < /property>
        < property name="hibernateProperties">
            < props>
                < prop key="hibernate.dialect">
                    org.hibernate.dialect.DerbyDialect
                < /prop>
                < prop key="hibernate.show_sql">
                   true
                < /prop>
            < /props>
        < /property>
        < property name="mappingResources">
            < list>
                < value>edujlufuliangdomainBook.hbm.xml< /value>
            < /list>
        < /property>
    < /bean>
< /beans>

applicationContext-dao.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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">
    
    < bean id="bookDAO" class="edu.jlu.fuliang.dao.BookDAO">
        < property name="sessionFactory">
            < ref bean="sessionFactory" />
        < /property>
    < /bean>
< /beans>

接下来我们来写我们的Service层：

edu.jlu.fuliang.service.BookManageService.java

package edu.jlu.fuliang.service;
import java.util.List;

import edu.jlu.fuliang.domain.Book;

public interface BookManageService {
    public List< Book> getAllBooks();
    public List< Book> getBookByName(String name);
    public void updateBook(Book book);
    public void addBook(Book book);
    public void deleteBook(long id);
}

edu.jlu.fuliang.service.impl.BookManageServiceImpl.java:

package edu.jlu.fuliang.serviceImpl;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.jlu.fuliang.dao.BookDAO;
import edu.jlu.fuliang.domain.Book;
import edu.jlu.fuliang.service.BookManageService;

public class BookManageServiceImpl implements BookManageService{
    private static final Log log = LogFactory.getLog(BookManageServiceImpl.class);
    private BookDAO bookDAO;
    @Override
    public void addBook(Book book) {
        bookDAO.save(book);
    }

    @Override
    public void deleteBook(long id) {
        Book book = bookDAO.findById(id);
        bookDAO.delete(book);
    }

    @Override
    public List< Book> getAllBooks() {
        return bookDAO.findAll();
    }

    @Override
    public List< Book> getBookByName(String name) {
        return bookDAO.findByName(name);
    }

    @Override
    public void updateBook(Book book) {
        log.info(book);
        bookDAO.attachDirty(book);
    }

    public BookDAO getBookDAO() {
        return bookDAO;
    }

    public void setBookDAO(BookDAO bookDAO) {
        this.bookDAO = bookDAO;
    }
}

然后我们来配置Service和事务:

applicationContext-service.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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

    < bean id="bookManageServiceTarget" class="edu.jlu.fuliang.serviceImpl.BookManageServiceImpl">
        < property name="bookDAO">
            < ref bean="bookDAO"/>
        < /property>
    < /bean>
    < bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        < property name="sessionFactory" ref="sessionFactory"/>
    < /bean>
    < bean id="bookManageService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
        < property name="transactionManager" ref="transactionManager"/>
        < property name="target" ref="bookManageServiceTarget"/>
        < property name="transactionAttributes">
            < props>
                < prop key="add*">PROPAGATION_REQUIRED< /prop>
                < prop key="delete*">PROPAGATION_REQUIRED< /prop>
                < prop key="update*">PROPAGATION_REQUIRED< /prop>
                < prop key="get*">PROPAGATION_REQUIRED,readOnly< /prop>
            < /props>
        < /property>
    < /bean>
< /beans>

最后我们来把dwr整合进来:

我们在web.xml添加ContextLoaderListener来加载applicationContext-db.xml,applicationContext-dao.xm,applicationContext-service.xml,以及配置DwrServlet:

web.xml:

< ?xml version="1.0" encoding="UTF-8"?>
< web-app version="2.4" 
    xmlns="http://java.sun.com/xml/ns/j2ee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 < 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>dwr-invoker< /servlet-name>
     < servlet-class>org.directwebremoting.servlet.DwrServlet< /servlet-class>
     < init-param>
         < param-name>debug< /param-name>
         < param-value>true< /param-value>
     < /init-param>
 < /servlet>
 < servlet-mapping>
     < servlet-name>dwr-invoker< /servlet-name>
     < url-pattern>/dwr/*< /url-pattern>
 < /servlet-mapping>
< /web-app>

在dwr.xml中配制bean的创建方式,类型转换,以及Service要暴露的接口:

< dwr>
    < allow>
        < convert converter="bean" match="edu.jlu.fuliang.domain.Book"/>
        < create creator="spring" javascript="BookManageService" >
            < param name="beanName" value="bookManageService"/>
            < include method="getAllBooks"/>
            < include method="getBookByName"/>
            < include method="updateBook"/>
            < include method="addBook"/>
            < include method="deleteBook"/>
        < /create>
   < /allow>
< /dwr>

最后,我们编写jsp页面index.jsp:

< html>
< head>< title>DWR test< /title>
    < script type='text/javascript' src='/DWRTest/dwr/interface/BookManageService.js'>< /script>
    < script type='text/javascript' src='/DWRTest/dwr/engine.js'>< /script>
    < script type='text/javascript' src='/DWRTest/dwr/util.js'>< /script>

    < script type="text/javascript">
        var bookCache = ...{};
        var currentBook = null;
        
        function loadAllBooks(){
            BookManageService.getAllBooks(handleGetAllBooks,handleGetAllBooksError);
        }
        function handleGetAllBooks(books){
            dwr.util.removeAllRows("booksBody",{ filter:function(tr) ...{
      return (tr.id != "pattern");
      }});

            var book,id;
            for(var i = 0; i <  books.length; i++){
                book = books[i];
                id = book.id;
            
                dwr.util.cloneNode("pattern", { idSuffix:id });
                dwr.util.setValue("t_name" + id, book.name);
                dwr.util.setValue("t_isbm" + id, book.isbm);
                dwr.util.setValue("t_author" + id,book.author);
               $("pattern" + id).style.display = "block";
               bookCache[id] = book;
            }
        }
        function handleGetAllBooksError(msg){
            alert("Error: " + msg);
        }
        
        function addBook(){
            var book = ...{name:null,isbm:null,author:null};
            dwr.util.getValues(book);
            dwr.engine.beginBatch();
                 BookManageService.addBook(book);
                 loadAllBooks();
              dwr.engine.endBatch();
        }
        
        function editBook(btId){
            currentBook = bookCache[btId.substring(4)];
            dwr.util.setValues(currentBook);
        }
        
        function updateBook(){
            var book = {id:null,name:null,isbm:null,author:null}; 
            dwr.util.getValues(book);
            book.id = currentBook.id;
            BookManageService.updateBook(book,handleUpdateBook,handleUpdateBookError);
        }
        
        function handleUpdateBook(){
            alert("Update book successfully!");
            loadAllBooks();
        }
        
        function handleUpdateBookError(msg){
            alert("Error: " + msg);
        }
        
        function deleteBook(btId){
            var i = confirm("Are you sure to delete the book?");
            if(i == true)
                BookManageService.deleteBook(btId.substring(6),handleDeleteBook,handleDeleteBookError);
        }
        
        function handleDeleteBook(){
          alert("The book has been delete successfully!");
          loadAllBooks();
        }
        
        function handleDeleteBookError(msg){
          alert("Error: " + msg);
        }
    < /script>
< /head>