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dwr(Direct Web Remoting)的使用

2012-06-13 16:07 204 查看

作用：远程调用java代码

安装：加入包，配置web.xml，配置dwr.xml（WEB-INF下）,在页面中引入相关js

web.xml

<listener>
<listener-class>org.directwebremoting.servlet.DwrListener</listener-class>
</listener>

<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>

dwr.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
<dwr>
<allow>
<!--
<filter class="com.example.dwr.monitor.MonitoringAjaxFilter"/>
<filter class="org.directwebremoting.filter.ExtraLatencyAjaxFilter">
<param name="delay" value="200"/>
</filter>
-->
<!-- intro - for the test on index.html -->
<create creator="new">
<param name="class" value="org.konghao.dwr.model.MyDwr"/>
</create>
<!-- 对象转换器 -->
<convert converter="bean" match="org.konghao.dwr.model.User"/>
<convert converter="bean" match="org.konghao.dwr.model.Group"/>
<!-- 显示异常对象 -->
<convert match="java.lang.Exception" converter="exception"/>
<convert converter="bean" match="java.lang.StackTraceElement"/>
</allow>
</dwr>

jsp中引入相关js

<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/engine.js"></script>
<script type="text/javascript" src="<%=request.getContextPath()%>/dwr/interface/MyDwr.js"></script>

<script type="text/javascript">
MyDwr.hello("世界",function(data){
alert(data);
});
</script>

<script type="text/javascript">
MyDwr.load(loadUser);
function loadUser(user) {
alert(user.id+","+user.username+","+user.group.name);
}
</script>

<script type="text/javascript">
MyDwr.list(listUser);
function listUser(users) {
for(var i=0;i<users.length;i++) {
alert(users[i].username+","+users[i].group.name);
}
}
</script>

<script type="text/javascript">
var user = {id:1,username:"李四",group:{id:2,name:"网络中心"}};
MyDwr.add(user);
</script>

<script type="text/javascript">
MyDwr.deleteUser({
callback:deleteUser,
errorHandler:function(msg,exception) {
alert(msg);
/*for(var ea in exception) {
alert(ea);
}
alert(exception.stackTrace);*/
alert(dwr.util.toDescriptiveString(exception,1));
}
});
function deleteUser(data) {
}
</script>

<body>
<input type="text" id="a"/>+<input type="text" id="b"/><input type="button" value="获取" onclick="calAdd()">
<br/>
<select id="address">

</select>
<input type="button" value="初始化地址" onclick="initAddress()"/>
<input type="text" id="addressName"/><input type="button" value="添加" onclick="addAddress()"/>
<table width="600" border="1">
<thead>
<tr>
<td>ID</td>
<td>username</td>
<td>groupName</td>
</tr>
</thead>
<tbody id="user">
</tbody>
</table>
<input type="button" value="初始化用户" onclick="initUser()"/>
</body>

<script type="text/javascript">
function calAdd() {
var a = dwr.util.getValue("a");
var b = dwr.util.getValue("b");
MyDwr.add(parseInt(a),parseInt(b),function(data){
alert(data);
});
}

function addAddress() {
var a = dwr.util.getValue("addressName");
var data = [{id:a,name:a}];
dwr.util.addOptions("address",data,"id","name");
}
function initAddress() {
dwr.util.removeAllOptions();
var data = [{id:1,name:"北京"},{id:2,name:"天津"},{id:3,name:"上海"}];
dwr.util.addOptions("address",data,"id","name");
}

function initUser() {
MyDwr.list(function(data){
dwr.util.addRows("user",data,cellFuncs,{ escapeHtml:false });
});
}
var cellFuncs=[
function(data){return data.id},
function(data){return data.username},
function(data){return data.group.name}
];
</script>

<script type="text/javascript">
function upload() {
var file = dwr.util.getValue("myfile");
alert(file.value);
alert(file);
MyDwr.upload(file,file.value,function(data){
alert(data);
});
}
</script>
<body>
<input type="file" id="myfile"/>
<input type="button" value="上传文件" onclick="upload()"/>
</body>

MyDwr.java

public class MyDwr {
public String hello(String world) {
System.out.println("hello "+world);
return "hello "+world;
}

public User load() {
User u = new User(1,"张三",new Group(1,"财务处"));
return u;
}

public List<User> list() {
List<User> users = new ArrayList<User>();
users.add(new User(1,"张三",new Group(1,"财务处")));
users.add(new User(2,"李四",new Group(2,"科技处")));
users.add(new User(3,"王五",new Group(3,"宣传部")));
return users;
}

public void add(User user) {
System.out.println(user);
}

public void deleteUser() {
throw new MyException("在删除用户的时候有错");
}

public int add(int a,int b) {
return a+b;
}

public String upload(InputStream is,String filename) throws IOException {
//WebContext可以获取HttpServlet的对象
WebContext wc = WebContextFactory.get();
HttpServletRequest req = wc.getHttpServletRequest();
String realpath = req.getSession().getServletContext().getRealPath("upload");
String fn = FilenameUtils.getName(filename);
String filepath = realpath+"/"+fn;
FileUtils.copyInputStreamToFile(is, new File(filepath));
return filepath;
}
}

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标签： dwr web function user exception string

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