DWR 2.0.10之简单测试

来源：互联网发布：美工岗位职责是那些编辑：程序博客网时间：2024/05/22 14:10

1.官网下载 http://directwebremoting.org/dwr/downloads/index.html#stableRelease dwr.jar的java包

http://commons.apache.org/proper/commons-logging/ 下载 Commons Logging.,因为dwr依赖日志jar包

并将dwr.jar和commons-logging-1.1.3.jar添加到web工程的lib下面

2.在web.xml中添加如下配置代码,如下

<servlet>  <display-name>DWR Servlet</display-name>  <servlet-name>dwr-invoker</servlet-name>    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>  <init-param>      <param-name>crossDomainSessionSecurity</param-name>     <param-value>false</param-value>  </init-param></servlet><servlet-mapping>  <servlet-name>dwr-invoker</servlet-name>  <url-pattern>/dwr/*</url-pattern></servlet-mapping>

在init-param中有一个属性为crossDomainSessionSecurity,默认为true,设为false的原因在于dwr采用的request使用了秘密的请求,为了防止csrf攻击,详情参看官网描述

http://directwebremoting.org/dwr/security/script-tag-protection.html#scriptTagHack

3.在WEB-INF下面新建dwr的配置文件dwr.xml 内容如下

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC    "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN"    "http://getahead.org/dwr/dwr20.dtd"><dwr>  <allow>    <create creator="new" javascript="DWRTestJava">      <param name="class" value="com.undergrowth.dwrtest.DWRTest" />    </create>     <convert converter="bean" match="com.undergrowth.bean.Person" />  </allow>  <signatures>  <![CDATA[  import java.util.List;  import java.util.Map;  ]]>  </signatures></dwr>

在这里稍微注意一下在官网上头部为

<!DOCTYPE dwr PUBLIC    "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN"    "http://getahead.org/dwr/dwr30.dtd">

这里改成如上 2.0 20因为我们使用的dwr版本为2.0.10 不然会造成版本不匹配的问题

对于dwr.xml的配置文件里面的涵义分别如下:

create标签主要负责用于声明公开给javascript调用的类和方法

如果在create标签里面没有指明公开的方法的话默认公开所有方法

convert标签指明了参数传递和返回值时,对应的javabean应该如何映射,对于java基本的数据类型还有数组、列表的话 dwr会自动在javascript和java类型之间转换(意思就是,如果在参数传递和返回值的时候没有javabean的话,可以不用convert标签)

4.编写java端代码,如下

DWRTest.java

package com.undergrowth.dwrtest;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import com.undergrowth.bean.Person;public class DWRTest {public DWRTest(){}//传入参数 返回值public String dwrReturnString(String name){return "你的姓名为:"+name;}//传入参数 返回列表public List<Person> dwrReturnList(String name){Person person=new Person(name, new Date(), 20);List<Person>  list=new ArrayList<>();list.add(person);return list;}//传入参数 返回列表public Map<String,Person> dwrReturnMap(String name){Person person=new Person(name, new Date(), 22);Map<String,Person> map=new HashMap<>();map.put("1", person); return map;}   //传入JavaBean 返回JavaBeanpublic Person dwrReturnBean(Person p){Person person=new Person(p.getName(), new Date(), p.getAge());return person;}}

Person.java

package com.undergrowth.bean;import java.util.Date;public class Person {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}private Date birthday;private int age;public Person(String name, Date birthday, int age) {super();this.name = name;this.birthday = birthday;this.age = age;}public Person() {super();}}

5.测试首页 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="<%=basePath%>/dwr/interface/DWRTestJava.js"></script><script type="text/javascript" src="<%=basePath%>/dwr/engine.js" ></script><script type="text/javascript" src="<%=basePath%>/dwr/util.js" ></script><script type="text/javascript">window.onload=init;function init(){document.getElementById("startId").innerHTML="开始dwr调用,路径为:<%=basePath%>";//调用返回字符串函数DWRTestJava.dwrReturnString("张三",callReturnFunc);//调用返回列表函数DWRTestJava.dwrReturnList("张三",callReturnFuncList);//调用返回map函数DWRTestJava.dwrReturnMap("张三",callReturnFuncMap);//传入javabean进行处理 再返回javabeanvar infoVo={name:"张三",age:100};DWRTestJava.dwrReturnBean(infoVo,callReturnFuncBean);}function callReturnFunc(data){//document.getElementById("startId").innerHTML="开始dwr字符串调用调用";document.getElementById("contentId").innerHTML=data;}function callReturnFuncList(list){var data="list总共有:"+list.length+"个元素,";for(var i=0;i<list.length;i++){    var person=list[i];data+=person.name+" "+person.birthday+" "+person.age+"\n";}  document.getElementById("contentListId").innerHTML=data;}function callReturnFuncMap(map){var count=0;var data="";for(var i in map){    var person=map[i];data+=person.name+" "+person.birthday+" "+person.age+"\n";count++;}  document.getElementById("contentMapId").innerHTML="map总共有:"+count+"个元素,"+data;}function callReturnFuncBean(data){document.getElementById("contentVoId").innerHTML=data.name+" "+data.birthday+" "+data.age;}</script>  </head>    <body>   <span id="startId"></span><br/>    <span id="contentId"></span><br/>    <span id="contentListId"></span><br/>    <span id="contentMapId"></span><br/>    <span id="contentVoId"></span><br/>  </body></html>

6.结果

http://localhost:8080/DwrTest1/index.jsp

如下