关于dwr.xml配置

1.如果要往页面传入一个对象时，在dwr.xml中的添加对象转换器，具体代码如下：

<allow>

<!-- creator="创建器"(new:UserDaoImpl dao = new UserDaoImpl()),javascript="产生的javascript名称" -->

<create creator="new" javascript="JUser">

<param name="class" value="com.xasxt.dao.impl.UserDaoImpl"></param>

<include method="checkUserName"/>

</create>

<create creator="new" javascript="JProvince">

<param name="class" value="com.xasxt.dao.impl.ProvinceDaoImpl"></param>

<include method="getAllProvinces"/>

<include method="getCitiesByProvinceId"/>

</create>

<!-- bean转换器：java对象json之间相互转化 -->

<convert converter="bean" match="com.xasxt.entity.Province"></convert>

<convert converter="bean" match="com.xasxt.entity.City"></convert>

</allow>

2后台的操作：

public List<Province> getAllProvinces(){

List<Province> list = new ArrayList<Province>();

String sql="select * from province";

try {

rs = this.query(sql);

while(rs.next()){

Province province = new Province();

province.setProvinceId(rs.getInt("provinceId"));

province.setProvinceName(rs.getString("provinceName"));

list.add(province);

}

} catch (SQLException e) {

e.printStackTrace();

}finally{

this.close();

}

return list;

}

将数据库查到的Provice放到list集合中；

3。页面取list中的类容：

<script type='text/javascript' src='/dwrDemo/dwr/engine.js'></script>

<script type='text/javascript' src='/dwrDemo/dwr/interface/JProvince.js'></script>

<script type='text/javascript' src='/dwrDemo/dwr/util.js'></script>

<script type="text/javascript">

function loadProvinces(){

JProvince.getAllProvinces(callBack);

}

function callBack(data){

<!--addOptions("表单中的id",返回的数据,"添加的ID","查询出每一条的Name")-->

dwr.util.addOptions("province",data,"provinceId","provinceName");

}

}

</script>