DWR初识

来源：互联网发布：织梦cms模板编辑：程序博客网时间：2024/06/06 05:03

1.import jars
commons-logging-1.0.4.jar
dwr.jar
2.web.xml

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

3.DwrDemo.java

public String getHello(String username){        System.out.println("DwrDemo getHello()......");        return "Hello "+username;    }

UserDao.java

private static Map<Integer, User> dataMap=new HashMap<Integer, User>();    public boolean save(User user){        System.out.println("*****************************");        System.out.println("UserDao save()........");        System.out.println("保存用户信息：");        System.out.println("user.username: "+user.getUsername());        System.out.println("usr.password: "+user.getPassword());        dataMap.put(1, user);        return true;    }    public User getUser(String id){        return (User)dataMap.get(1);    }

User.java

    public String username;    public String password;    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }

4.dwr.xml

<?xml version="1.0" encoding="UTF-8"?><dwr>    <allow>        <!--配置的一个演示类，javascript="Demo" 表示可以在页面中用Demo这个名称指向DwrDemo这个java类，类中的方法可以在前台调用 -->        <!-- creater="new"表示每调用一次时,都需要new一个 -->        <create creator="new" javascript="Demo">            <param name="class" value="com.yue.test1.dwr.services.DwrDemo" />        </create>        <create creator="new" javascript="MyDate">            <param name="class" value="java.util.Date" />        </create>        <create creator="new" javascript="UserDao">            <param name="class" value="com.yue.test1.dwr.services.UserDao" />        </create>             <convert converter="bean" match="com.yue.test1.dwr.bean.User" />     </allow></dwr>

5.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><script type="text/javascript" src="../js/jquery-1.3.2.js"></script><script type='text/javascript' src='${pageContext.request.contextPath}/dwr/engine.js'></script><script type='text/javascript' src='${pageContext.request.contextPath}/dwr/util.js'></script><script type='text/javascript' src='${pageContext.request.contextPath}/dwr/interface/Demo.js'></script><script type='text/javascript' src='${pageContext.request.contextPath}/dwr/interface/UserDao.js'></script><script type="text/javascript">    //此函数中可以调用java类的方法，除了java方法本身的参数外，还要将回调函数名作为参数传给java方法      function sayHello(name) {        Demo.getHello(name, dwrHandler);    }    //这是dwr的一个回调函数，data参数即java方法getHello(String name)的返回值      function dwrHandler(data) {        alert(data);    }    function save2(data){        if(data){            alert("注册成功");        }else{            alert("注册失败");          }    }     function onSave(){        var userMap={};        userMap.username=form1.username.value;        userMap.password=form1.password.value;        UserDao.save(userMap,save2);    }    function getUser(data){        if(data==null){            alert("找不到用户");            return ;        }        alert("用户信息："+data.username+data.password);    }    function findUser(){        UserDao.getUser("1",getUser);    }</script><title>DWR Demo</title></head><body><button onclick="sayHello('Yue')">say Hello to Yue</button><br/><form name="form1">用户名：<input type="text" name="username"/><br/>密码：<input type="text" name="password"/><br/><input type="submit" name="submitBtn" value="提交" onclick="onSave()"/></form><button onclick="findUser()">findUser</button><br/></body></html>

6.other
不要出现Javascript保留关键字；和保留关键字同名的函数指定被排除。多数Javascript的关键字和Java是相同的。所以你不可能有一个方法叫做”try()”
但是该死”delete()”对与Javascript有着特殊意义，而对Java则不是。
Javascript方法重载是不支持的，所以尽量不要再Java中使用。

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