DWR通过Annotation与spring整合

 

DWR 2.0 增加了一个很有趣的新特性，Annotation，因此可以摆脱了dwr.xml里面的配置.同时也可以方便的和spring整合.

从官方网站下载dwr.jar包。然后将它放在你webapp的WEB-INF/lib目录下。 修改web.xml

 

<!--<br><br>Code highlighting produced by Actipro CodeHighlighter (freeware)<br>http://www.CodeHighlighter.com/<br><br>-->< 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 >
< init-param >
< param-name > logLevel </ param-name >
< param-value > DEBUG </ param-value >
</ init-param >
< init-param >
< param-name > classes </ param-name >
< param-value >
com.spring.User,com.beans.Book
</ 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/beans.xml
</ param-value >
</ context-param >
< listener >
< listener-class >
org.springframework.web.context.ContextLoaderListener
</ listener-class >
</ listener >

 

beans.xml是spring的配置文件.org.springframework.web.context.ContextLoaderListener是一个监听器.

< init-param >
< param-name > classes </ param-name >
< param-value >
com.spring.User,com.beans.Book
</ param-value >
</ init-param >

param-value:参数为被注解的类.

编写相关类
com.beans.Book:

@DataTransferObject(converter=BeanConverter.class)
public class Book{
@RemoteProperty
private Stringname;
@RemoteProperty
private Stringauthor;

public StringgetAuthor(){
return author;
}

public void setAuthor(Stringauthor){
this .author = author;
}

public StringgetName(){
return name;
}

public void setName(Stringname){
this .name = name;
}
}

@DataTransferObject: 标注在客户端和服务器之间转换类.对应dwr.xml中的<convert>标签.
注解的源代码:

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public@interfaceDataTransferObject
{
/**
*Converterthatconvertsinstanceoftheclass(default:beanconverter).
*/
Class<?extendsConverter>converter()defaultBeanConverter.class;

/**
*Parametersfortheconverter.
*/
Param[]params()default{};
}

关于annotation可以看这篇文章,java元数据
@RemoteProperty :标注在类中需要转换的属性.
源代码:

@Target({ElementType.FIELD,ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public@interfaceRemoteProperty
{
}

如果使用dwr.xml配置,可以这样:

<convertconverter="bean"match="com.beans.Book">
<paramname="include"value="name,author"/>
</convert>

User:

@RemoteProxy(name="user",creator=SpringCreator.class,
creatorParams={
@Param(name="beanName",value="user")
})
@DataTransferObject(converter=BeanConverter.class)
publicclassUser{
@RemoteProperty
privateStringwelcome;
@RemoteProperty
privateStringusername;
@RemoteProperty
privateStringaddress;
@RemoteProperty
privateList<Book>books;
@RemoteProperty
privateintage;

publicStringgetAddress(){
returnaddress;
}

publicvoidsetAddress(Stringaddress){
this.address=address;
}

publicintgetAge(){
returnage;
}

publicvoidsetAge(intage){
this.age=age;
}
@RemoteMethod
publicStringgetUsername(){
returnusername;
}

publicvoidsetUsername(Stringusername){
this.username=username;
}

publicStringgetWelcome(){
returnwelcome;
}

publicvoidsetWelcome(Stringwelcome){
this.welcome=welcome;
}
@RemoteMethod
publicList<Book>getBooks(){
returnbooks;
}

publicvoidsetBooks(List<Book>books){
this.books=books;
}
@RemoteMethod
publicUsergetUser(Stringwelcome){
this.welcome=welcome;
returnthis;
}

}

@RemoteProxy:标注要给远程调用的类.
RemoteProxy的name设置创造出来的对象的名字,creator指定使用那种创造器,例子中使用SpringCreator.creatorParams指定创造器的其他参数.不同的创造器参数是不同的.
@RemoteMethod:标注给远程调用的方法

4.修改beans.xml

<beanid="remote"class="com.spring.Remote"></bean>
<beanid="user"class="com.spring.User"
p:username="windfree"p:address="anhuihefei"p:age="25">
<propertyname="books">
<list>
<refbean="C"/>
<refbean="java"/>
</list>
</property>
</bean>
<beanid="java"class="com.beans.Book"p:name="java"p:author="mypure"></bean>
<beanid="C"class="com.beans.Book"p:name="C"p:author="zgliu"></bean>

其中p为spring2.0中提供的标签.
5.html页面

<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<title>SpringUserInfo.html</title>
<scripttype='text/javascript'src='/DWRExample/dwr/interface/user.js'></script>
<scripttype='text/javascript'src='/DWRExample/dwr/engine.js'></script>
<scripttype='text/javascript'src='/DWRExample/dwr/util.js'></script>
<scripttype="text/javascript">
functiontest(){
user.getUser("Hello",callback);
}
varcellFuncs=[
function(data){returndata.name;},
function(data){returndata.author;},
];
functioncallback(user){
//alert(user.books)
DWRUtil.setValue('result',"欢迎你！"+"姓名："+user.username+",年龄："+user.age+"，住址："+user.address);
DWRUtil.addRows('tableInfo',user.books,cellFuncs,
{escapeHtml:false,
rowCreator:function(options){
varrow=document.createElement("tr");
varindex=options.rowIndex*50;
row.style.color="rgb("+index+",0,0)";
returnrow;
},
cellCreator:function(options){
vartd=document.createElement("td");
varindex=255-(options.rowIndex*50);
td.style.backgroundColor="rgb("+index+",255,255)";
td.style.fontWeight="bold";
returntd;
}
})
}
</script>


</head>

<body>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<inputid="jbutton"type="button"value="取得信息"onclick="test()"/>
<br>
<divid="result"></div><br>
<tableborder="1">
<thead><tr>
<th>书名</th><th>姓名</th>
</tr></thead>
<tbodyid="tableInfo">
</tbody>
</table>
</body>
</html>

其中使用了util.js中的一些函数.