dwr前后台交互

最新推荐文章于 2025-08-14 08:54:38 发布

最新推荐文章于 2025-08-14 08:54:38 发布 · 166 阅读

文章标签：

#dwr #json #Ajax #JavaScript #ViewUI

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在网上找了很多dwr的例子。不是很齐全，补充如下：

需要的jar是dwr.jar。180kb的。不是最新版本。

dwr.xml和web.xml是同级目录

1.index.jsp



<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://"+ request.getServerName() + ":" + request.getServerPort()+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<base href="<%=basePath%>">
		<title>My JSP 'index.jsp' starting page</title>
		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
		<!--
			<link rel="stylesheet" type="text/css" href="styles.css">
		-->

		<script type="text/javascript" src="dwr/interface/MyJsNameForDwr.js"></script>
		<script type="text/javascript" src="dwr/engine.js"></script>
		<script type="text/javascript" src="dwr/util.js"></script>

		<script type="text/javascript">
//var callBackValue = function callBack(data)

		function callBackValue(data) 
		{
			DWRUtil.setValue("text", data);
		}

		function callBackValue2(data) 
		{
			DWRUtil.setValue("objectvalues", data);
		}

		function getJavaMethodsValues() 
		{
			MyJsNameForDwr.getSomething('a', callBackValue);

		var objectValue = {
							aString:'x',
							bInt:'2',
							objectV:{list:'list',string:'string'}
						  };

		MyJsNameForDwr.getSomethingObject(objectValue, callBackValue2);

		}

		function clearValue() 
		{
			document.getElementById('text').value = "";
		}
		</script>

	</head>

	<body>
		<h1>
			Ajax _DWR
		</h1>

		<input type="button" name="show" value="调用java方法" onclick="getJavaMethodsValues();">
		<input type="button" name="clear" value="清空值" onclick="javascript:clearValue();">
		<br>
		<input type="text" name="text" id="text">
		<input type="text" name="objectvalues" id="objectvalues">
  </body>
</html>

2.web.xml


<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<servlet>
		<servlet-name>dwr-invoker</servlet-name>
		<servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>
		<init-param>
			<param-name>debug</param-name>
			<param-value>true</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
		<servlet-name>dwr-invoker</servlet-name>
		<url-pattern>/dwr/*</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>index.jsp</welcome-file>
	</welcome-file-list>
</web-app>

3.dwr.xml


<?xml version="1.0" encoding="UTF-8"?>   
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
	<allow>
		<convert match="com.dwr.ObjectV" converter="bean">
			<param name="list,string"></param>
		</convert>

		<convert match="com.dwr.ObjectValues" converter="bean">
			<param name="aString,bInt,objectV"></param>
		</convert>

		<create creator="new" javascript="MyJsNameForDwr" scope="application">
			<param name="class" value="com.dwr.Class" />

			<include method="getSomething" />
			<include method="getSomethingObject" />

		</create>

	</allow>
</dwr>

4.Class.java


package com.dwr;

public class Class
{
    /**
     * 从前台传递参数到后台方法调用
     * @param par
     * @return
     */
    public boolean getSomething(String par)
    {
        System.out.println("par == " + par);
        String par2 = "b";
        System.out.println("par2 == " + par2);
        if (par.equals("a")&&par2.equals("b"))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * 从前台传递对象到后台
     * @param 
     * @return
     */

    public boolean getSomethingObject(ObjectValues obj)
    {
        System.out.println("aString = " + obj.getaString());
        System.out.println("bInt = " + obj.getbInt());
        System.out.println("ObjectV =  " + obj.getObjectV().getString());

        if (obj.getaString().equals("x"))
        {
            return true;
        }
        else
        {
            return false;
        }
    }  
}

5.ObjectValues.java


package com.dwr;

public class ObjectValues
{
    /**
     * 前台传递到后台的对象包装
     */
    private String aString;
    private int bInt;

    private ObjectV objectV;

    public String getaString()
    {
        return aString;
    }

    public void setaString(String aString)
    {
        this.aString = aString;
    }

    public int getbInt()
    {
        return bInt;
    }

    public void setbInt(int bInt)
    {
        this.bInt = bInt;
    }

    public ObjectV getObjectV()
    {
        return objectV;
    }

    public void setObjectV(ObjectV objectV)
    {
        this.objectV = objectV;
    }

}

6.ObjectV.java


package com.dwr;

import java.util.List;

public class ObjectV
{
    private String list;
    private String string;

    public String getList()
    {
        return list;
    }

    public void setList(String list)
    {
        this.list = list;
    }

    public String getString()
    {
        return string;
    }

    public void setString(String string)
    {
        this.string = string;
    }

}