??????DWR 2.0 增加了一個很有趣的新特性，Annotation，因此可以擺脫了dwr.xml里面的配置.同時也可以方便的和spring整合.
? 從官方網站下載dwr.jar包。然后將它放在你webapp的WEB-INF/lib目錄下。 修改web.xml
<
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是一個監聽器.
<
?init-param?
>
?
?????????????
<
?param-name?
>
?classes?
</
?param-name?
>
?
?????????????
<
?param-value?
>
?
???????com.spring.User,com.beans.Book
?????????????
</
?param-value?
>
?
?????????
</
?init-param?
>
?
param-value:參數為被注解的類.?
編寫相關類??????????
??com.beans.Book:
@DataTransferObject(converter=BeanConverter.class)
public
?
class
?Book?{
????@RemoteProperty
????
private
?String?name;
????@RemoteProperty
????
private
?String?author;
????
public
?String?getAuthor()?{
????????
return
?author;
????}
????
public
?
void
?setAuthor(String?author)?{
????????
this
.author?
=
?author;
????}
????
public
?String?getName()?{
????????
return
?name;
????}
????
public
?
void
?setName(String?name)?{
????????
this
.name?
=
?name;
????}
}
????????@DataTransferObject: 標注在客戶端和服務器之間轉換類.對應dwr.xml中的<convert>標簽.
???????????????注解的源代碼:
?????????????????????
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public?@interface?DataTransferObject
{
????/**
?????*?Converter?that?converts?instance?of?the?class?(default:?bean?converter).
?????*/
????Class<??extends?Converter>?converter()?default?BeanConverter.class;
????/**
?????*?Parameters?for?the?converter.
?????*/
????Param[]?params()?default?{};
}
?????????關于annotation可以看這篇文章,
java元數據????????@RemoteProperty :標注在類中需要轉換的屬性.
????????????源代碼:
??????????????????
@Target({?ElementType.FIELD,?ElementType.METHOD?})
@Retention(RetentionPolicy.RUNTIME)
public?@interface?RemoteProperty
{
}
???????如果使用dwr.xml配置,可以這樣:
??????
<convert?converter="bean"?match="com.beans.Book">
??<param?name="include"?value="name,?author"/>
</convert>
?User:
@RemoteProxy(name="user",creator=SpringCreator.class,
????????creatorParams={
????????????@Param(name="beanName",value="user")
????????????})
@DataTransferObject(converter=BeanConverter.class)
public?class?User?{
????@RemoteProperty?
????private?String?welcome;
????@RemoteProperty?
????private?String?username;
????@RemoteProperty?
????private?String?address;
????@RemoteProperty?
????private?List<Book>?books;
????@RemoteProperty
????private?int?age;
????public?String?getAddress()?{
????????return?address;
????}
????public?void?setAddress(String?address)?{
????????this.address?=?address;
????}
????public?int?getAge()?{
????????return?age;
????}
????public?void?setAge(int?age)?{
????????this.age?=?age;
????}
????@RemoteMethod
????public?String?getUsername()?{
????????return?username;
????}
????public?void?setUsername(String?username)?{
????????this.username?=?username;
????}
????public?String?getWelcome()?{
????????return?welcome;
????}
????public?void?setWelcome(String?welcome)?{
????????this.welcome?=?welcome;
????}
????@RemoteMethod
????public?List<Book>?getBooks()?{
????????return?books;
????}
????
????public?void?setBooks(List<Book>?books)?{
????????this.books?=?books;
????}
????@RemoteMethod
????public?User?getUser(String?welcome)?{
????????this.welcome?=?welcome;
????????return?this;
????}
}
????? @RemoteProxy:標注要給遠程調用的類.
???????????????RemoteProxy的name設置創造出來的對象的名字,creator指定使用那種創造器,例子中使用
SpringCreator.creatorParams指定創造器的其他參數.不同的創造器參數是不同的.??????@RemoteMethod:標注給遠程調用的方法
4.修改beans.xml
??????
<bean?id="remote"?class="com.spring.Remote"></bean>
????<bean?id="user"?class="com.spring.User"?
????????????p:username="windfree"?p:address="anhui?hefei"?p:age="25">
????????<property?name="books">
????????????<list>
????????????????<ref?bean="C"/>
????????????????<ref?bean="java"/>
????????????</list>
????????</property>
????</bean>
????<bean?id="java"?class="com.beans.Book"?p:name="java"?p:author="mypure"></bean>
????<bean?id="C"?class="com.beans.Book"?p:name="C"?p:author="zgliu"></bean> ???其中p為spring2.0中提供的標簽.
5.html頁面
??????
<!DOCTYPE?HTML?PUBLIC?"-//W3C//DTD?HTML?4.01?Transitional//EN">
<html>
????<head>
????????<title>SpringUserInfo.html</title>
????????<script?type='text/javascript'?src='/DWRExample/dwr/interface/user.js'></script>
????????<script?type='text/javascript'?src='/DWRExample/dwr/engine.js'></script>
????????<script?type='text/javascript'?src='/DWRExample/dwr/util.js'></script>
????????<script?type="text/javascript">
????????function?test(){
????????????user.getUser("Hello",callback);???
????????}
????????var?cellFuncs?=?[
??????????????function(data)?{?return?data.name;?},
??????????????function(data)?{?return?data.author;?},
????????????];
????????function?callback(user){
????????????//alert(user.books)
?????????????DWRUtil.setValue('result',"歡迎你！"+"???姓名："+user.username+",年齡："+user.age+"，住址："+user.address);???
?????????????DWRUtil.addRows('tableInfo',user.books,cellFuncs,
?????????????????????{?escapeHtml:false?,
???????????????????rowCreator:function(options)?{
????????????????????????var?row?=?document.createElement("tr");
????????????????????????var?index?=?options.rowIndex?*?50;
????????????????????????row.style.color?=?"rgb("?+?index?+?",0,0)";
????????????????????????return?row;
??????????????????????},
??????????????????cellCreator:function(options)?{
????????????????????var?td?=?document.createElement("td");
????????????????????var?index?=?255?-?(options.rowIndex?*?50);
????????????????????td.style.backgroundColor?=?"rgb("?+?index?+?",255,255)";
????????????????????td.style.fontWeight?=?"bold";
????????????????????return?td;
??????????????????}
?????????????})
????????}
????</script>
????</head>
????<body>
???????? ?
????????<input?id="jbutton"?type="button"?value="取得信息"?onclick="test()"?/>
????????<br>
????????<div?id="result"></div><br>
????????<table?border="1">
????????????<thead><tr>
????????????????<th>書名</th><th>姓名</th>????????????????
????????????</tr></thead>
????????????<tbody?id="tableInfo">
????????????</tbody>
????????</table>
????</body>
</html>
??????其中使用了util.js中的一些函數.