dwr使用实例

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DWR Servlet Struts Hibernate Spring

dwr使用实例

http://www.kpwang.com/jsp_java/3611068211012591.htm

开发环境：eclipse3.1.2 myeclipse4.1.1 Tomcat5.0.28 Mysql5.0

dwr类包版本是1.1
步骤一：配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>3</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>3</param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.do</url-pattern>

</servlet-mapping>
    <servlet>
        <servlet-name>dwr-invoker</servlet-name>
        <servlet-class>uk.ltd.getahead.dwr.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>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml
        </param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <filter>
        <filter-name>EncodingFilter</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>

    </filter>
    <filter-mapping>
        <filter-name>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

      <error-page>
        <error-code>404</error-code>
        <location>/404.jsp</location>
    </error-page>

    <error-page>
        <error-code>500</error-code>
        <location>/500.jsp</location>
    </error-page>

    <taglib>
        <taglib-uri>/WEB-INF/struts-bean</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-bean.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>/WEB-INF/struts-logic</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-logic.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>/WEB-INF/struts-html</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-html.tld</taglib-location>
    </taglib>

<taglib>
        <taglib-uri>/WEB-INF/struts-tiles</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-tiles.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>/WEB-INF/ntu</taglib-uri>
        <taglib-location>/WEB-INF/tld/ntu.tld</taglib-location>
    </taglib>

</web-app>

二：spring中注入相关service
<bean >
        <property >
            <ref bean="commonDAO" />
        </property>
    </bean>

三:AjaxTestServiceImp代码
public class AjaxTestServiceImp implements IAjaxTestService {

    private ICommonDAO commonDAO;

    public void setCommonDAO(ICommonDAO commonDAO) {
        this.commonDAO = commonDAO;
    }

    public List getEmployeeById(String deptid) {
        DetachedCriteria detachedCriteria=DetachedCriteria.forClass(Employee.class);
        detachedCriteria.setFetchMode(Employee.PROP_DEPTID,

        detachedCriteria.add(Restrictions.eq(Employee.PROP_DEPTID+".id",deptid));
        List result=commonDAO.findByCriteria(detachedCriteria);
        return result;
}
}

四：dwr.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">

<dwr>
<allow>
  <create creator="spring" javascript="ajaxTestService">
   <param value="ajaxTestService" />
   <include method="getEmployeeById" />
  </create>
        <convert converter="bean" match="com.lion.cms.domain.pojo.Employee" />
        <param value="com.lion.cms.domain.pojo.Dept"/>
</allow>
</dwr>

五：jsp页面
<html:select styleId="deptid" property="deptid" >
                <html:optionsCollection label="deptname" value="id"/>
            </html:select>
            <html:select property="employee" styleId="employee">
            <html:option value="" >请选择</html:option>
            </html:select>

<script type="text/javascript">
<!--
    // 加载employee下拉列表。

   function loadEmployList(deptid){
        if(deptid==null||deptid==´´){
        clearEmployeeSel();
        return;
        }
        ajaxTestService.getEmployeeById(loadEmployListCallback,deptid);
}
    var loadEmployListCallback=function(items){
        clearEmployeeSel();
        DWRUtil.addOptions("employee",

http://www.kpwang.com/items,"id","truename");
    }
    function clearEmployeeSel(){
        DWRUtil.removeAllOptions("employee");
        DWRUtil.addOptions("employee",[{label:´请选择´,value:´´}],"value","label");
    }
//-->
</script>

职工和部门是多对一关系，例子简单，不详细叙述了
dwr中spring和hibernate的配置相关帮助文档：
http://getahead.ltd.uk/dwr/server/spring
http://getahead.ltd.uk/dwr/server/hibernate

dept.hbm.xml代码如下：
<hibernate-mapping package="com.lion.cms.domain.pojo">
<class

  table="dept"
>
<meta attribute="sync-DAO">false</meta>
   <id
   name="id"
   type="string"
   column="id"
  >
   <generator />
  </id>

</class>
</hibernate-mapping>

employee.hbm.xml代码如下：

<hibernate-mapping package="com.lion.cms.domain.pojo">
<class
  name="Employee"
  table="employee"
>
  <meta attribute="sync-DAO">false</meta>
  <id
   name="id"
   type="string"
   column="Id"
  >
   <generator />
  </id>