DWR学习文档

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j2ee框架

DWR JavaScript Acegi Spring Servlet

2008 - 11 - 06

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：

代码

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();
}
}

代码

xml version = "1.0" encoding = "UTF-8" ?>
< dwr >
< allow >
< create javascript = "jshello" creator = "new" scope = "application" >
< param name = "class" value = "org.li.dwr.Hello" > </ param >
</ create >
</ allow >
</ dwr >

代码

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);
}

代码

< 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 >

代码

< 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 >

代码

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 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 getBooks()
{
return books;
}
public void setBooks(List books)
{
this .books = books;
}
public List getBook()
{
this .books = new ArrayList();
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 ;
}
}

代码

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;
}
}

代码

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);
}
}

代码

< 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 >

代码

< 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 >

代码

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);
}

package org.li.dwr.spring;
import java.util.List;
import org.li.dwr.Book;
public class User
{
private String welcome;
private String username;
private S

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语言学习集锦 | Hinernate的映射类型

2008-11-06 17:41
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