Struts 2 + Spring 2 + JPA + AJAX 樣本

 

struts官方教程中有這麼一個例子，是Struts 2 + Spring 2 + JPA + AJAX 樣本，其源地址是：

http://struts.apache.org/2.3.1.1/docs/struts-2-spring-2-jpa-ajax.html

下載了例子後，手工匯入包來構建，我使用了2.3.1的包，構建中遇到很多問題。主要是包關係的問題，以及STRUTS更新後的一些改變。

做了以下一些改變：

1struts2.0的ajax支援主要以DWR和dojo為主，並專門提供ajax主題,如：<s:head theme="ajax"/>,但是在struts2.1不在提供ajax主題，而將原來的ajax主題放入了dojo外掛程式中，我們需要在工程中加個struts2-dojo-plugin.jar ，將dojo 標籤引入到jsp頁面

<%@ taglib uri="/struts-dojo-tags" prefix="sx" %>

2。把<s:head theme="ajax"/>改為

<s:head theme="xhtml" /><sx:head parseContent="true" />

3 將原有的一些<s: 換成<sx:, 可以根絕提示來換，有些是不能換的，按照ECLIPSE的提示即可。如果有報錯，可以掉裡面的theme="ajax"

4 驗證也調不通，於是去掉了驗證。

5 一切就緒，報錯：

FreeMarker template error!Expression parameters.pushId is undefined on line 24, column 6 in template/ajax/a-close.ftl.The problematic instruction:----------==> if parameters.pushId [on line 24, column 1 in template/ajax/a-close.ftl]

於是按照一個頁面的方法，做了如下操作：
The template problems you are having can be fixed by copying the template files into your local project (keeping the template/ajax directory structure) and changing the ftl so that they check for the existence of the parameter first i.e. change to: <#if
parameters.pushId?exists && parameters.pushId>.

就是找到了報錯的位置，複製了兩個檔案出來，並修改語句<#if parameters.pushId?exists && parameters.pushId>.

代碼與結構：

1使用MYSQL 資料庫

CREATE Database quickstart

CREATE TABLE 'quickstart'.'Person' (  'id' INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,  'firstName' VARCHAR(45) NOT NULL,  'lastName' VARCHAR(45) NOT NULL,  PRIMARY KEY('id'))ENGINE = InnoDB;

2 用了以下這些包

3 目錄結構

3 JAVA代碼如下：

Person.java

@Entity表示使用JPA實體。ID上面加入@Id說明這個是ID，@GeneratedValue自動產生ID值

package quickstart.model;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;@Entitypublic class Person {    @Id    @GeneratedValue    private Integer id;    private String lastName;    private String firstName;    public String getFirstName() {        return firstName;    }    public void setFirstName(String firstName) {        this.firstName = firstName;    }    public String getLastName() {        return lastName;    }    public void setLastName(String lastName) {        this.lastName = lastName;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }}

PersonService.java

package quickstart.service;import java.util.List;import quickstart.model.Person;public interface PersonService {    public List<Person> findAll();    public void save(Person person);    public void remove(int id);    public Person find(int id);}

PersonServiceImpl.java 

@PersistenceContext標註使用JPA的上下文，設定實體管理器。@TransactionalIf
the class is annotated as @Transactional, Spring will make sure that its methods run inside a transaction.

package quickstart.service;import java.util.List;import javax.persistence.EntityManager;import javax.persistence.PersistenceContext;import javax.persistence.Query;import org.springframework.transaction.annotation.Transactional;import quickstart.model.Person;@Transactionalpublic class PersonServiceImpl implements PersonService {    private EntityManager em;    @PersistenceContext    public void setEntityManager(EntityManager em) {        this.em = em;    }    @SuppressWarnings("unchecked")    public List<Person> findAll() {        Query query = getEntityManager().createQuery("select p FROM Person p");        return query.getResultList();    }    public void save(Person person) {        if (person.getId() == null) {            // new            em.persist(person);        } else {            // update            em.merge(person);        }    }    public void remove(int id) {        Person person = find(id);        if (person != null) {            em.remove(person);        }    }    private EntityManager getEntityManager() {        return em;    }    public Person find(int id) {        return em.find(Person.class, id);    }}

/PersonAction.java

package quickstart.action;import java.util.List;import quickstart.model.Person;import quickstart.service.PersonService;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.Preparable;public class PersonAction implements Preparable {    private PersonService service;    private List<Person> persons;    private Person person;    private Integer id;   public PersonAction(PersonService service) {        this.service = service;    }    public String execute() {        this.persons = service.findAll();        return Action.SUCCESS;    }    public String save() {        this.service.save(person);        this.person = new Person();        return execute();    }    public String remove() {        service.remove(id);        return execute();    }    public List<Person> getPersons() {        return persons;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public void prepare() throws Exception {        if (id != null)            person = service.find(id);    }    public Person getPerson() {        return person;    }    public void setPerson(Person person) {        this.person = person;    }}

4 配置文檔

persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"    version="1.0">    <persistence-unit name="punit">    </persistence-unit></persistence>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <constant name="struts.objectFactory" value="spring" />    <constant name="struts.devMode" value="true" />    <package name="person" extends="struts-default">        <action name="list" method="execute" class="personAction">            <result>pages/list.jsp</result>            <result name="input">pages/list.jsp</result>        </action>        <action name="remove" class="personAction" method="remove">            <result>pages/list.jsp</result>            <result name="input">pages/list.jsp</result>        </action>        <action name="save" class="personAction" method="save">            <result>pages/list.jsp</result>            <result name="input">pages/list.jsp</result>        </action>    </package></struts>

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:aop="http://www.springframework.org/schema/aop"    xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">    <bean        class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />    <bean id="personService" class="quickstart.service.PersonServiceImpl" />    <bean id="entityManagerFactory"        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">        <property name="dataSource" ref="dataSource" />        <property name="jpaVendorAdapter">            <bean                class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">                <property name="database" value="MYSQL" />                <property name="showSql" value="true" />            </bean>        </property>    </bean>    <bean id="dataSource"        class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.jdbc.Driver" />        <property name="url" value="jdbc:mysql://localhost/quickstart" />        <property name="username" value="root" />        <property name="password" value="qwe123" />    </bean>    <bean id="transactionManager"        class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="entityManagerFactory" />    </bean>    <tx:annotation-driven transaction-manager="transactionManager" />    <bean id="personAction" scope="prototype"        class="quickstart.action.PersonAction">        <constructor-arg ref="personService" />    </bean></beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app id="person" 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">    <display-name>person</display-name>    <filter>        <filter-name>struts2</filter-name>        <filter-class>            org.apache.struts2.dispatcher.FilterDispatcher        </filter-class>    </filter>    <filter-mapping>        <filter-name>struts2</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list>    <listener>        <listener-class>            org.springframework.web.context.ContextLoaderListener        </listener-class>    </listener></web-app>

5.頁面代碼

這裡使用的struts的AJAX，感覺不怎麼好用。不如使用EASYUI ，jquery，配合struts的json外掛程式來做會好點。

index.jsp

<%@ taglib prefix="s" uri="/struts-tags"%><%@ taglib uri="/struts-dojo-tags" prefix="sx" %><html><head><s:head theme="xhtml" /><sx:head parseContent="true" /><script type="text/javascript">dojo.event.topic.subscribe("/save", function(data, type, request) {    if(type == "load") {dojo.byId("id").value = "";dojo.byId("firstName").value = "";dojo.byId("lastName").value = "";}});dojo.event.topic.subscribe("/edit", function(data, type, request) {    if(type == "before") {var id = data.split("_")[1];var tr = dojo.byId("row_"+id);var tds = tr.getElementsByTagName("td");dojo.byId("id").value = id;dojo.byId("firstName").value = dojo.string.trim(dojo.dom.textContent(tds[0]));dojo.byId("lastName").value = dojo.string.trim(dojo.dom.textContent(tds[1]));}});</script></head><body>    <s:url action="list" id="descrsUrl"/>        <div style="width: 300px;border-style: solid">        <div style="text-align: right;">    <sx:a  notifyTopics="/refresh">Refresh</sx:a>    </div>    <sx:div id="persons" theme="ajax" href="%{descrsUrl}" loadingText="Loading..." listenTopics="/refresh"/>        </div>        <br/><div style="width: 300px;border-style: solid"><p>Person Data</p><s:form action="save" >    <s:textfield id="id" name="person.id" cssStyle="display:none"/><s:textfield id="firstName" label="Fisrt Name" name="person.firstName"/><s:textfield id="lastName" label="Last Name" name="person.lastName"/><sx:submit  targets="persons" notifyTopics="/save"/></s:form></div></body></html>

list.jsp

<%@ taglib prefix="s" uri="/struts-tags"%><%@ taglib uri="/struts-dojo-tags" prefix="sx" %><p>Persons</p><s:if test="persons.size > 0"><table><s:iterator value="persons"><tr id="row_<s:property value="id"/>"><td><s:property value="firstName" /></td><td><s:property value="lastName" /></td><td><s:url id="removeUrl" action="remove"><s:param name="id" value="id" /></s:url><sx:a href="%{removeUrl}" targets="persons">Remove</sx:a><sx:a id="a_%{id}"  notifyTopics="/edit">Edit</sx:a></td></tr></s:iterator></table></s:if>

最終結果如下：

 

程式碼封裝：

http://download.csdn.net/detail/magic_wz/3999729 已經打好了所需的各種包，可以ECLIPSE直接運行