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    * likunkun
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   发表时间：2006-12-22
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    * 让Dwr和Spring-MVC通过Annotation方式共同工作

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Email:javafish@sunxin.org
DWR是作为远程调用的ajax框架，将服务端的java类，方法和浏览器的javascript的类，方法对应起来。现在官方最新的版本是DWR2.0，可以在http://getahead.ltd.uk/dwr/download下载到。
我们真对DWR2.0做一些例子讲解一下它的特性：
Hello World：
新建一个web项目DWRStudy，在项目中构建路径中加入dwr.jar，
新建类Hello如下：
Java代码收藏代码

   1. package org.li.dwr;
   2.
   3. package org.li.dwr;
   4.
   5. import java.util.Date;
   6.
   7. public class Hello
   8. {
   9.     public String getHelloWorld()
10.     {
11.         return "现在的时间为："+new Date();
12.     }
13. }

package org.li.dwr;

package org.li.dwr;

import java.util.Date;

public class Hello
{
public String getHelloWorld()
{
return "现在的时间为："+new Date();
}
}

在WEB-INF目录下新建dwr.xml文件：
Java代码收藏代码

   1. <?xml version="1.0" encoding="UTF-8"?>
   2. <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd">
   3. <dwr>
   4.     <allow>
   5.     
   6.         <create javascript="jshello" creator="new" scope="application">
   7.             <param name="class" value="org.li.dwr.Hello"></param>
   8.         </create>
   9.     </allow>
10. </dwr>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd">
<dwr>
<allow>

<create javascript="jshello" creator="new" scope="application">
<param name="class" value="org.li.dwr.Hello"></param>
</create>
</allow>
</dwr>

在WebRoot目录里新建hello.js
Java代码收藏代码

   1. function load()//载入的时候调用
   2. {
   3.     var jbutton = document.getElementById("jbutton");
   4.     jbutton.onclick=function(event)//注册按钮点击事件
   5.     {
   6.         jbClick();
   7.     };
   8. }
   9. function jbClick()//按钮点击事件
10. {
11.     jshello.getHelloWorld(callback);//没有参数传递，只传递回调函数就行
12. }
13. function callback(msg)//回调函数
14. {
15.     DWRUtil.setValue('jdiv',msg);
16. }

function load()//载入的时候调用
{
var jbutton = document.getElementById("jbutton");
jbutton.onclick=function(event)//注册按钮点击事件
{
jbClick();
};
}
function jbClick()//按钮点击事件
{
jshello.getHelloWorld(callback);//没有参数传递，只传递回调函数就行
}
function callback(msg)//回调函数
{
DWRUtil.setValue('jdiv',msg);
}

在WebRoot目录里新建HelloWorld.html
Java代码收藏代码

   1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2. <html>
   3.   <head>
   4.     <title>HelloWorld.html</title>
   5.     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   6.     <script type='text/javascript' src='dwr/interface/jshello.js'></script>
   7.     <script type='text/javascript' src='dwr/engine.js'></script>
   8.     <script type='text/javascript' src='dwr/util.js'></script>
   9.     <script type="text/javascript" src="hello.js"></script>
10.
11.   </head>
12.
13.   <body>
14.     <input id="jbutton" type="button" value="得到Hello World"/>
15.     <div id="jdiv"></div>
16.     <script>load()</script>
17.   </body>
18. </html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>HelloWorld.html</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type='text/javascript' src='dwr/interface/jshello.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
    <script type="text/javascript" src="hello.js"></script>

</head>

<body>
   <input id="jbutton" type="button" value="得到Hello World"/>
<div id="jdiv"></div>
<script>load()</script>
</body>
</html>

在web.xml中加入一个dwr的servlet：
Java代码收藏代码

   1. <servlet>
   2.         <servlet-name>dwr-invoker</servlet-name>
   3.         <servlet-class>
   4.             org.directwebremoting.servlet.DwrServlet
   5.         </servlet-class>
   6.         <init-param>
   7.             <param-name>debug</param-name>
   8.             <param-value>true</param-value>
   9.         </init-param>
10.         <load-on-startup>1</load-on-startup>
11.     </servlet>
12.
13.     <servlet-mapping>
14.         <servlet-name>dwr-invoker</servlet-name>
15.         <url-pattern>/dwr/*</url-pattern>
16.     </servlet-mapping>

<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>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

在运行一下服务器在浏览器里输入http://localhost:8080/DWRStudy/HelloWorld.html，然后点一下按钮下面就会显示服务端的系统时间了，而浏览器页面并没有被刷新。
下面解释一下：
1. 新建的Hello类中有一个getHelloWorld方法这个方法就是作为远程调用的服务端方法，这个Hello类也就是远程调用的类。方法的返回值为服务端当前的时间
2. dwr.xml是DWR用来配置服务端类和浏览器端javascript类之间的映射。可以下载dtd看一下，在<allow></allow>里类配置映射类如：<create javascript="jshello" creator="new" scope="application">
<param name="class" value="org.li.dwr.Hello"></param>
</create>
javascript="jshello"是在浏览器端的javascript的映射的类名，（不要用javascript里的关键字）creator="new"是表示这个类是dwr自己创建的，如果creator="new"那么就必须有下面的<param name=”class” value=”类的全路径”></param>，creator还可为spring(与spring集成的时候),script(与 apache的一个框架BSF集成的时候用),后来又加入了struts,jsf,ejb3.现在是个HelloWorld让大家体验一下，具体后面会细讲。最后的scope=”application”是说这个pojo类的范围，和jsp是一样的。
3. 创建hello.js和HelloWorld.html都是看自己是怎么发挥了，注意的是在HelloWorld.html中导入js文件的时候注意顺序和路径命名规律，自己发挥的这个hello.js一定放在后面，因为要调用其它js文件中的函数。由于在HelloWorld.html里写入了<script>load()</script>所以在html加载的时候会调用hello.js里的load方法(注意这几个js文件里的函数最好不要重名)在load里面做的事情就是注册一下id为jbutton的按钮的点击事件。当我们点击id为jbutton的按钮的时候就开始用与服务器端的类相对应的javascript类了（jshello），直接调用jshello类的getHelloWorld方法，可以向函数传递参数，不过要在最后加一个回调函数。而我们的服务端的类没有参数就直接传回调函数了。在回调函数的形参msg是服务端Hello类中 getHelloWorld方法返回值。在回调函数里面调用了DWR的工具类DWRUtil类的setValue方法设置id为jdiv的值。另外我们把 doucment.getElementById(“jbutton”);换与$(“jbutton”)也可以得到同样的效果，这就有点像 prototype了。
4. 在web.xml里加入DWRServlet的配置一是为了远程调用，二是自动生成了<script type='text/javascript' src='dwr/interface/jshello.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>文件。
上个HelloWorld例子只是返回了一个字符串，当然我们显示字符串很容易，可是如果返回一个对象怎么办呢？，DWR为我们将java类和javascript的DOM对象，不过这得需要我们在dwr.xml里配置。
再看一个综合的例子：
新建类User
Java代码收藏代码

   1. package org.li.dwr;
   2.
   3. import java.io.FileInputStream;
   4. import java.io.FileNotFoundException;
   5. import java.io.IOException;
   6. import java.util.ArrayList;
   7. import java.util.List;
   8. import java.util.Properties;
   9.
10. public class User
11. {
12.     private String welcome;
13.     private String username;
14.     private String address;
15.     private List<Book> books;
16.     private int age;
17.     public String getAddress()
18.     {
19.         return address;
20.     }
21.     public void setAddress(String address)
22.     {
23.         this.address = address;
24.     }
25.     public int getAge()
26.     {
27.         return age;
28.     }
29.     public void setAge(int age)
30.     {
31.         this.age = age;
32.     }
33.     public String getUsername()
34.     {
35.         return username;
36.     }
37.     public void setUsername(String username)
38.     {
39.         this.username = username;
40.     }
41.     public String getWelcome()
42.     {
43.         return welcome;
44.     }
45.     public void setWelcome(String welcome)
46.     {
47.         this.welcome = welcome;
48.     }
49.     public List<Book> getBooks()
50.     {
51.         return books;
52.     }
53.     public void setBooks(List<Book> books)
54.     {
55.         this.books = books;
56.     }
57.     public List<Book> getBook()
58.     {
59.         this.books = new ArrayList<Book>();
60.         Book javaBook = new Book();
61.         Book vcBook = new Book();
62.         javaBook.setAuthor("孙鑫");
63.         vcBook.setAuthor("孙鑫");
64.         javaBook.setName("java Web开发详解");
65.         vcBook.setName("vc++深入详解");
66.         this.books.add(javaBook);
67.         this.books.add(vcBook);
68.         return this.books;
69.     }
70.     public User getUser(String welcome)
71.     {
72.         this.welcome=welcome;
73.         try
74.         {
75.             FileInputStream fis = new FileInputStream("D:\\workspace\\DWRStudy\\src\\user.properties");
76.             Properties pp = new Properties();
77.             pp.load(fis);
78.             this.username=pp.getProperty("username");
79.             this.age=Integer.valueOf(pp.getProperty("age"));
80.             this.address=pp.getProperty("address");
81.             fis.close();
82.         }
83.         catch (FileNotFoundException e)
84.         {
85.             // TODO Auto-generated catch block
86.             e.printStackTrace();
87.         }
88.         catch (IOException e)
89.         {
90.             // TODO Auto-generated catch block
91.             e.printStackTrace();
92.         }
93.         return this;
94.     }
95. }

package org.li.dwr;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

public class User
{
private String welcome;
private String username;
private String address;
private List<Book> books;
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;
}
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;
}
public List<Book> getBooks()
{
return books;
}
public void setBooks(List<Book> books)
{
this.books = books;
}
public List<Book> getBook()
{
this.books = new ArrayList<Book>();
Book javaBook = new Book();
Book vcBook = new Book();
javaBook.setAuthor("孙鑫");
vcBook.setAuthor("孙鑫");
javaBook.setName("java Web开发详解");
vcBook.setName("vc++深入详解");
this.books.add(javaBook);
this.books.add(vcBook);
return this.books;
}
public User getUser(String welcome)
{
this.welcome=welcome;
try
{
FileInputStream fis = new FileInputStream("D:\\workspace\\DWRStudy\\src\\user.properties");
Properties pp = new Properties();
pp.load(fis);
this.username=pp.getProperty("username");
this.age=Integer.valueOf(pp.getProperty("age"));
this.address=pp.getProperty("address");
fis.close();
}
catch (FileNotFoundException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return this;
}
}

新建Book类：
Java代码收藏代码

   1. package org.li.dwr;
   2.
   3. public class Book
   4. {
   5.     private String name;
   6.     private String author;
   7.     public String getAuthor()
   8.     {
   9.         return author;
10.     }
11.     public void setAuthor(String author)
12.     {
13.         this.author = author;
14.     }
15.     public String getName()
16.     {
17.         return name;
18.     }
19.     public void setName(String name)
20.     {
21.         this.name = name;
22.     }
23. }

package org.li.dwr;

public class Book
{
private String name;
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;
}
}

新建DWRLog类
Java代码收藏代码

   1. package org.li.dwr.log;
   2.
   3. import java.lang.reflect.Method;
   4.
   5. import org.directwebremoting.AjaxFilterChain;
   6.
   7. public class DWRLog implements org.directwebremoting.AjaxFilter
   8. {
   9.
10.     public Object doFilter(Object obj, Method method, Object[] params, AjaxFilterChain chain) throws Exception
11.     {
12.         System.out.println("过滤器Log输出:..对象："+obj.getClass().getName()+"方法："+method.getName());
13.         return chain.doFilter(obj, method,params);
14.     }
15.
16. }

package org.li.dwr.log;

import java.lang.reflect.Method;

import org.directwebremoting.AjaxFilterChain;

public class DWRLog implements org.directwebremoting.AjaxFilter
{

public Object doFilter(Object obj, Method method, Object[] params, AjaxFilterChain chain) throws Exception
{
System.out.println("过滤器Log输出:..对象："+obj.getClass().getName()+"方法："+method.getName());
return chain.doFilter(obj, method,params);
}

}

新建D:\\workspace\\DWRStudy\\src\\user.properties
username=javafish
age=21
address=北京市海淀区
然后在dwr.xml里加入
Java代码收藏代码

   1. <create javascript="jsuser" creator="new">
   2.             <param name="class" value="org.li.dwr.User"></param>
   3.             
   4.             <include method="getUser"/>
   5.             <include method="getBook"/>
   6.             
   7.             <filter class="org.li.dwr.log.DWRLog"></filter>
   8.         </create>
   9.         
10.         <convert match="org.li.dwr.User" converter="bean"></convert>
11.         <convert match="org.li.dwr.Book" converter="bean"></convert>

<create javascript="jsuser" creator="new">
<param name="class" value="org.li.dwr.User"></param>

<include method="getUser"/>
<include method="getBook"/>

<filter class="org.li.dwr.log.DWRLog"></filter>
</create>

<convert match="org.li.dwr.User" converter="bean"></convert>
<convert match="org.li.dwr.Book" converter="bean"></convert>

新建UserInfo.html
Java代码收藏代码

   1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2. <html>
   3.   <head>
   4.     <title>UserInfo.html</title>
   5.     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   6.     <script type='text/javascript' src='dwr/interface/jsuser.js'></script>
   7.     <script type='text/javascript' src='dwr/engine.js'></script>
   8.     <script type='text/javascript' src='dwr/util.js'></script>
   9.     <script type="text/javascript" src="userInfo.js"></script>
10.
11.   </head>
12.
13.   <body>
14.     请输入你的名字：
15.     <input id="name" type="text"/>
16.     <input id="jbutton" type="button" value="得到javafish的信息"/>
17.     <input id="sbutton" type="button" value="得到javafish的书"/>
18.     <div id="result"></div>
19.     <script>load()</script>
20.   </body>
21. </html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>UserInfo.html</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type='text/javascript' src='dwr/interface/jsuser.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
    <script type="text/javascript" src="userInfo.js"></script>

</head>

<body>
请输入你的名字：
<input id="name" type="text"/>
    <input id="jbutton" type="button" value="得到javafish的信息"/>
<input id="sbutton" type="button" value="得到javafish的书"/>
<div id="result"></div>
<script>load()</script>
</body>
</html>

新建userInfo.js
Java代码收藏代码

   1. function load()
   2. {
   3.     var jbutton = $("jbutton");
   4.     jbutton.onclick=function(event)
   5.     {
   6.         bOnClick();
   7.     };
   8.     var sbutton = $("sbutton");
   9.     sbutton.onclick=function(event)
10.     {
11.         sOnClick();
12.     };
13. }
14. function bOnClick()
15. {
16.     jsuser.getUser($("name").value,callback);
17. }
18. function callback(msg)
19. {
20.     var user = msg;
21.     DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address+user.books[0].author);
22. }
23.
24.
25. function sOnClick()
26. {
27.     jsuser.getBook(callbackBooks);
28. }
29. function callbackBooks(msg)
30. {
31.     alert(msg);
32.     DWRUtil.setValue('result',msg);
33. }

function load()
{
var jbutton = $("jbutton");
jbutton.onclick=function(event)
{
bOnClick();
};
var sbutton = $("sbutton");
sbutton.onclick=function(event)
{
sOnClick();
};
}
function bOnClick()
{
jsuser.getUser($("name").value,callback);
}
function callback(msg)
{
var user = msg;
DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address+user.books[0].author);
}

function sOnClick()
{
jsuser.getBook(callbackBooks);
}
function callbackBooks(msg)
{
alert(msg);
DWRUtil.setValue('result',msg);
}

运行服务器输入http://localhost:8080/DWRStudy/UserInfo.html，可看到运行结果
这个例子需要解释的就是dwr.xml了
在这里用到了两个java类，User、Book，方法呢就是User.getUser和User.getBook，而Book类呢由于我们没有在javascript中调用，所以就不用配置Book的create了。
大家可能会奇怪为什么会多出来两个<convert match="org.li.dwr.User" converter="bean"></convert>
<convert match="org.li.dwr.Book" converter="bean"></convert>
呢，是因为在调用getBook和getUser的时候会返回给javascript有关User和Book的对象或数据，这里的用<convert match=”类” converter=”bean”/>做一下转换，否则javascript将不会得到有效的数据。
下面讨论一下DWR的安全性，由于我们将javaBean整体都对外暴露了，所以说会有非常多的安全问题，真对这些DWR也作了一些的措施就是上面例子中dwr.xml的配置：
<include method="getUser"/>
<include method="getBook"/>
<filter class="org.li.dwr.log.DWRLog"></filter>
这样配置的话就只暴露了User类的两个方法getUser,getBook。就相对安全多了，相反还有<exclude>的配置它们是类似的。对于安全我们也可以用DWR的过滤器来实现，这里我用过滤器实现的是一个日志记录。过滤器类只需要实现AjaxFilter接口就可以了，不过注意的是这个过滤器不是HttpServelt的过滤器而是DWR自己内部实现的（有兴趣可以查看一下源代码）。
真对DWR的安全性上来说，官方也不敢保证，官方只是说自己可以看一下源代码因地施宜。
不过DWR可以和acegi集成，让acegi来管理安全问题。由于acegi我还没有完全搞定关于DWR和acegi的集成，先放一放日后补充。
下面对DWR.xml的配置具体补充一下：
首先是<init></init>里面有<converter>和<create>是配置在初始化的时候需要创建和转化的类。
然后是<allow></allow>里面有<converter>和<create>这个地方就是正式的配置了，creator里有param,filter,include,exclude,auth，除了auth我们都接触过了，而auth 是集成J2EE的安全认证用的，这个可能和acegi的集成有关吧（？）。<converter>呢，它的converter有很多
? Array Converter
? Bean and Object Converters
? Collection Converter
? Enum Converter
? DOM Objects
这些都是转换的时候配置的
还有就是<signatures></signatures>的配置了，申明一些不java用反射不可得到的参数类型。
我在上面例子上用的getBook来本来想用signatures实现List<Book>的转换可是没有成功（不用配置就可以）
主要是真对jdk1.4以下的，我本机用的是jdk6,所以屡试不爽最后在官方DWR2的特性中看到如果你用的是DWR2和JDK5以上的话就不用配置了DWR会自动转换。
下面讲一下DWR与Spring的集成：
还是上面那个例子用Spring搞定大部分和上面一样
新建类User（包换了）
Java代码收藏代码

   1. package org.li.dwr.spring;
   2.
   3. import java.util.List;
   4.
   5. import org.li.dwr.Book;
   6.
   7. public class User
   8. {
   9.     private String welcome;
10.     private String username;
11.     private String address;
12.     private List<Book> books;
13.     private int age;
14.     public String getAddress()
15.     {
16.         return address;
17.     }
18.     public void setAddress(String address)
19.     {
20.         this.address = address;
21.     }
22.     public int getAge()
23.     {
24.         return age;
25.     }
26.     public void setAge(int age)
27.     {
28.         this.age = age;
29.     }
30.     public String getUsername()
31.     {
32.         return username;
33.     }
34.     public void setUsername(String username)
35.     {
36.         this.username = username;
37.     }
38.     public String getWelcome()
39.     {
40.         return welcome;
41.     }
42.     public void setWelcome(String welcome)
43.     {
44.         this.welcome = welcome;
45.     }
46.     public List<Book> getBooks()
47.     {
48.         return books;
49.     }
50.     public void setBooks(List<Book> books)
51.     {
52.         this.books = books;
53.     }
54.     public User getUser(String welcome)
55.     {
56.         this.welcome=welcome;
57.         return this;
58.     }
59. }

package org.li.dwr.spring;

import java.util.List;

import org.li.dwr.Book;

public class User
{
private String welcome;
private String username;
private String address;
private List<Book> books;
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;
}
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;
}
public List<Book> getBooks()
{
return books;
}
public void setBooks(List<Book> books)
{
this.books = books;
}
public User getUser(String welcome)
{
this.welcome=welcome;
return this;
}
}

Book还是以前那个
在src下新建application.xml文件（spring的配置文件）
Java代码收藏代码

   1. <?xml version="1.0" encoding="UTF-8"?>
   2. <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
   3.
   4. <beans>
   5.     <bean id="user" class="org.li.dwr.spring.User">
   6.         <property name="username">
   7.             <value>javafish</value>
   8.         </property>
   9.         <property name="age">
10.             <value>21</value>
11.         </property>
12.         <property name="address">
13.             <value>北京市海淀区</value>
14.         </property>
15.     </bean>
16. </beans>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
<bean id="user" class="org.li.dwr.spring.User">
<property name="username">
<value>javafish</value>
</property>
<property name="age">
<value>21</value>
</property>
<property name="address">
<value>北京市海淀区</value>
</property>
</bean>
</beans>

在dwr.xml加入：
Java代码收藏代码

   1. <create javascript="springUser" creator="spring">
   2.             <param name="beanName" value="user"></param>
   3.             
   4.             <param name="location" value="applicationContext.xml"></param>
   5.         </create><convert match="org.li.dwr.spring.User" converter="bean"></convert>

<create javascript="springUser" creator="spring">
<param name="beanName" value="user"></param>

<param name="location" value="applicationContext.xml"></param>
</create><convert match="org.li.dwr.spring.User" converter="bean"></convert>

新建springUserInfo.html
Java代码收藏代码

   1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2. <html>
   3.   <head>
   4.     <title>UserInfo.html</title>
   5.     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   6.     <script type='text/javascript' src='dwr/interface/springUser.js'></script>
   7.     <script type='text/javascript' src='dwr/engine.js'></script>
   8.     <script type='text/javascript' src='dwr/util.js'></script>
   9.     <script type="text/javascript" src="springuserInfo.js"></script>
10.
11.   </head>
12.
13.   <body>
14.     请输入你的名字：
15.     <input id="name" type="text"/>
16.     <input id="jbutton" type="button" value="得到javafish(spring)的信息"/>
17.     <div id="result"></div>
18.     <script>load()</script>
19.   </body>
20. </html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>UserInfo.html</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type='text/javascript' src='dwr/interface/springUser.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
    <script type="text/javascript" src="springuserInfo.js"></script>

</head>

<body>
请输入你的名字：
<input id="name" type="text"/>
    <input id="jbutton" type="button" value="得到javafish(spring)的信息"/>
<div id="result"></div>
<script>load()</script>
</body>
</html>

新建springUserInfo.js
Java代码收藏代码

   1. function load()
   2. {
   3.     var jbutton = $("jbutton");
   4.     jbutton.onclick=function(event)
   5.     {
   6.         bOnClick();
   7.     };
   8.     var sbutton = $("sbutton");
   9.     sbutton.onclick=function(event)
10.     {
11.         sOnClick();
12.     };
13. }
14. function bOnClick()
15. {
16.     springUser.getUser($("name").value,callback);
17. }
18. function callback(msg)
19. {
20.     var user = msg;
21.     DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address);
22. }

function load()
{
var jbutton = $("jbutton");
jbutton.onclick=function(event)
{
bOnClick();
};
var sbutton = $("sbutton");
sbutton.onclick=function(event)
{
sOnClick();
};
}
function bOnClick()
{
springUser.getUser($("name").value,callback);
}
function callback(msg)
{
var user = msg;
DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address);
}

在web.xml中加入
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/classes/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
运行服务器输入http://localhost:8080/DWRStudy/springUserInfo.html，可以看到运行结果
主要的区别是dwr.xml的配置，需要在creator=spring,然后里面的<param>的name用beanName, 值是spring的配置文件里的bean的id。Name=location是指定spring的配置文件的路径（如果不指定DWR可以根据 web.xml自动找到spring的主配置文件）。
DWR的Annotation配置
还是上面spring那个例子的功能再来一遍(new 的配置太简单)，这样的话项目中的dwr.xml对于这个例子就没有作用了
新建User类（包名换了）
Java代码收藏代码

   1. package org.li.dwr.spring.annotation;
   2.
   3. import java.util.List;
   4.
   5. import org.directwebremoting.annotations.Convert;
   6. import org.directwebremoting.annotations.Create;
   7. import org.directwebremoting.annotations.Param;
   8. import org.directwebremoting.annotations.RemoteMethod;
   9. import org.directwebremoting.annotations.RemoteProperty;
10. import org.directwebremoting.convert.BeanConverter;
11. import org.directwebremoting.spring.SpringCreator;
12. import org.li.dwr.Book;
13.
14. @Create(creator=SpringCreator.class,name="anspringuser",creatorParams={@Param(name="beanName",value="anuser"),@Param(name="location",value="applicationContext.xml")})
15. @Convert(converter=BeanConverter.class)
16. public class User
17. {
18.     private String welcome;
19.     private String username;
20.     @RemoteProperty
21.     private String address;
22.     private List<Book> books;
23.     private int age;
24.     public String getAddress()
25.     {
26.         return address;
27.     }
28.     public void setAddress(String address)
29.     {
30.         this.address = address;
31.     }
32.     public int getAge()
33.     {
34.         return age;
35.     }
36.     public void setAge(int age)
37.     {
38.         this.age = age;
39.     }
40.     public String getUsername()
41.     {
42.         return username;
43.     }
44.     public void setUsername(String username)
45.     {
46.         this.username = username;
47.     }
48.     public String getWelcome()
49.     {
50.         return welcome;
51.     }
52.     public void setWelcome(String welcome)
53.     {
54.         this.welcome = welcome;
55.     }
56.     public List<Book> getBooks()
57.     {
58.         return books;
59.     }
60.     public void setBooks(List<Book> books)
61.     {
62.         this.books = books;
63.     }
64.     @RemoteMethod
65.     public User getUser(String welcome)
66.     {
67.         this.welcome=welcome;
68.         return this;
69.     }
70. }

package org.li.dwr.spring.annotation;

import java.util.List;

import org.directwebremoting.annotations.Convert;
import org.directwebremoting.annotations.Create;
import org.directwebremoting.annotations.Param;
import org.directwebremoting.annotations.RemoteMethod;
import org.directwebremoting.annotations.RemoteProperty;
import org.directwebremoting.convert.BeanConverter;
import org.directwebremoting.spring.SpringCreator;
import org.li.dwr.Book;

@Create(creator=SpringCreator.class,name="anspringuser",creatorParams={@Param(name="beanName",value="anuser"),@Param(name="location",value="applicationContext.xml")})
@Convert(converter=BeanConverter.class)
public class User
{
private String welcome;
private String username;
@RemoteProperty
private String address;
private List<Book> books;
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;
}
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;
}
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;
}
}

新建过滤器类DWRAnLog
Java代码收藏代码

   1. package org.li.dwr.log.annotation;
   2.
   3. import java.lang.reflect.Method;
   4.
   5. import org.directwebremoting.AjaxFilter;
   6. import org.directwebremoting.AjaxFilterChain;
   7. import org.directwebremoting.annotations.Filter;
   8. import org.directwebremoting.filter.SpringTransactionAjaxFilter;
   9. @Filter(type=SpringTransactionAjaxFilter.class)
10. public class DWRAnLog implements AjaxFilter
11. {
12.
13.     public Object doFilter(Object obj, Method method, Object[] params, AjaxFilterChain chain) throws Exception
14.     {
15.         System.out.println("annotation过滤器Log输出:..对象："+obj.getClass().getName()+"方法："+method.getName());
16.         return chain.doFilter(obj, method, params);
17.     }
18.
19. }

package org.li.dwr.log.annotation;

import java.lang.reflect.Method;

import org.directwebremoting.AjaxFilter;
import org.directwebremoting.AjaxFilterChain;
import org.directwebremoting.annotations.Filter;
import org.directwebremoting.filter.SpringTransactionAjaxFilter;
@Filter(type=SpringTransactionAjaxFilter.class)
public class DWRAnLog implements AjaxFilter
{

public Object doFilter(Object obj, Method method, Object[] params, AjaxFilterChain chain) throws Exception
{
System.out.println("annotation过滤器Log输出:..对象："+obj.getClass().getName()+"方法："+method.getName());
return chain.doFilter(obj, method, params);
}

}

在spring的applicationContext.xml里加入
Java代码收藏代码

   1. <bean id="anuser" class="org.li.dwr.spring.annotation.User">
   2.         <property name="username">
   3.             <value>javafish</value>
   4.         </property>
   5.         <property name="age">
   6.             <value>21</value>
   7.         </property>
   8.         <property name="address">
   9.             <value>北京市海淀区</value>
10.         </property>
11.     </bean>

<bean id="anuser" class="org.li.dwr.spring.annotation.User">
<property name="username">
<value>javafish</value>
</property>
<property name="age">
<value>21</value>
</property>
<property name="address">
<value>北京市海淀区</value>
</property>
</bean>

新建AnSpringUserInfoHtml.html
Java代码收藏代码

   1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
   2. <html>
   3.   <head>
   4.     <title>UserInfo.html</title>
   5.     <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   6.     <script type='text/javascript' src='dwr/interface/anspringuser.js'></script>
   7.     <script type='text/javascript' src='dwr/engine.js'></script>
   8.     <script type='text/javascript' src='dwr/util.js'></script>
   9.     <script type="text/javascript" src="anspringuserInfo.js"></script>
10.
11.   </head>
12.
13.   <body>
14.     请输入你的名字：
15.     <input id="name" type="text"/>
16.     <input id="jbutton" type="button" value="得到javafish(spring)的信息"/>
17.     <div id="result"></div>
18.     <script>load()</script>
19.   </body>
20. </html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>UserInfo.html</title>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <script type='text/javascript' src='dwr/interface/anspringuser.js'></script>
<script type='text/javascript' src='dwr/engine.js'></script>
<script type='text/javascript' src='dwr/util.js'></script>
    <script type="text/javascript" src="anspringuserInfo.js"></script>

</head>

<body>
请输入你的名字：
<input id="name" type="text"/>
    <input id="jbutton" type="button" value="得到javafish(spring)的信息"/>
<div id="result"></div>
<script>load()</script>
</body>
</html>

新建anspringuserInfo.js
Java代码收藏代码

   1. function load()
   2. {
   3.     var jbutton = $("jbutton");
   4.     jbutton.onclick=function(event)
   5.     {
   6.         bOnClick();
   7.     };
   8. }
   9. function bOnClick()
10. {
11.     alert("haha");
12.     anspringuser.getUser($("name").value,callback);
13. }
14. function callback(msg)
15. {
16.     var user = msg;
17.     DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address);
18. }

function load()
{
var jbutton = $("jbutton");
jbutton.onclick=function(event)
{
bOnClick();
};
}
function bOnClick()
{
alert("haha");
anspringuser.getUser($("name").value,callback);
}
function callback(msg)
{
var user = msg;
DWRUtil.setValue('result',"欢迎你！"+user.welcome+"   姓名："+user.username+",年龄："+user.age+"，住址："+user.address);
}

在web.xml中
的DWR的servlet的初始化参数里加入
Java代码收藏代码

   1. <init-param>
   2.        <param-name>classes</param-name>
   3.        <param-value>
   4.             org.li.dwr.log.annotation.DWRAnLog,org.li.dwr.spring.annotation.User
   5.        </param-value>
   6.     </init-param>

<init-param>
       <param-name>classes</param-name>
       <param-value>
       org.li.dwr.log.annotation.DWRAnLog,org.li.dwr.spring.annotation.User
       </param-value>
</init-param>

运行服务器输入http://localhost:8080/DWRStudy/AnSpringUserInfo.html，成功了
用Annotation的配置和dwr.xml的意思基本一样，这里就不多做介绍了。
Util.js的函数库
$()和prototype.js一样相当于document.getElementById

(Set)getValue（）(设置)得到元素的值一般是（设置）得到元素的innerHTML。
getText()得到元素的文本值
(set)getValues()（设置）得到元素下的元素，以array为对象载体。
这里都是一些最常用的函数，具体可以看一下util.js文件。

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