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 @ interface DataTransferObject
{
/**
*Converterthatconvertsinstanceoftheclass(default:beanconverter).
*/
Class <? extends Converter > converter() default BeanConverter. 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 @ interface RemoteProperty
{
}

如果使用dwr.xml配置,可以这样:

< 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 Stringwelcome;
@RemoteProperty
private Stringusername;
@RemoteProperty
private Stringaddress;
@RemoteProperty
private List < Book > books;
@RemoteProperty
private int age;

public StringgetAddress(){
return address;
}

public void setAddress(Stringaddress){
this .address = address;
}

public int getAge(){
return age;
}

public void setAge( int age){
this .age = age;
}
@RemoteMethod
public StringgetUsername(){
return username;
}

public void setUsername(Stringusername){
this .username = username;
}

public StringgetWelcome(){
return welcome;
}

public void setWelcome(Stringwelcome){
this .welcome = welcome;
}
@RemoteMethod
public List < Book > getBooks(){
return books;
}

public void setBooks(List < Book > books){
this .books = books;
}
@RemoteMethod
public UsergetUser(Stringwelcome){
this .welcome = welcome;
return this ;
}

}

@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

< bean id ="remote" class ="com.spring.Remote" ></ bean >
< bean id ="user" class ="com.spring.User"
p:username ="windfree" p:address ="anhuihefei" 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为spring2.0中提供的标签.
5.html页面

<! DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//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', " 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){
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 >
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;
< input id ="jbutton" type ="button" value ="取得信息" onclick ="test()" />
< br >
< div id ="result" ></ div >< br >
< table border ="1" >
< thead >< tr >
< th > 书名 </ th >< th > 姓名 </ th >
</ tr ></ thead >
< tbody id ="tableInfo" >
</ tbody >
</ table >
</ body >
</ html >

其中使用了util.js中的一些函数.