如何使用 DWR 更新用户列表
我正在开发可以连接到 Gtalk 和 Facebook 的聊天客户端。我正在使用 DWR 来实现此目的。
登录后，我必须填充用户列表。在客户端我有
function showUsersOnline() {
var cellFuncs = [ function(user) {
return '<i>'+user+'</i>';
} ];
LoginG.usersOnline( {
callback : function(users) {
dwr.util.removeAllRows('usersOnline');
dwr.util.addRows("usersOnline", users, cellFuncs, {
escapeHtml : false
});
在服务器端我使用 Smack Api 来获取名册列表（在线）
public void usersOnline() {
Roster roster = connection.getRoster();
Collection<RosterEntry> entries = roster.getEntries();
System.out.println(roster.getEntryCount());
int count1 = 0;
int count2 = 0;
for (RosterEntry r : entries) {
String user = r.getUser();
Presence presence = roster.getPresence(user);
if (presence.getType() == Presence.Type.available) {
System.out.println(user + " is online");
count1++;
} else {
System.out.println(user + " is offline");
count2++;
}
现在我应该将数据作为 JSON 返回还是有一种方法 DWR 可以处理集合？？？
I am developing chat client which can connect to Gtalk and Facebook.I am using DWR for the purpose.
Once I log into I have to populate the user s lists. On client side I have
function showUsersOnline() {
var cellFuncs = [ function(user) {
return '<i>'+user+'</i>';
} ];
LoginG.usersOnline( {
callback : function(users) {
dwr.util.removeAllRows('usersOnline');
dwr.util.addRows("usersOnline", users, cellFuncs, {
escapeHtml : false
});
On server side I am using Smack Api to get the roster list(online)
public void usersOnline() {
Roster roster = connection.getRoster();
Collection<RosterEntry> entries = roster.getEntries();
System.out.println(roster.getEntryCount());
int count1 = 0;
int count2 = 0;
for (RosterEntry r : entries) {
String user = r.getUser();
Presence presence = roster.getPresence(user);
if (presence.getType() == Presence.Type.available) {
System.out.println(user + " is online");
count1++;
} else {
System.out.println(user + " is offline");
count2++;
}
Now should I return the data as JSON or is there a way DWR can handle the collection???
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如果您修改服务器方法
usersOnline()以返回Collection对象，则 DWR 会将其填充到回调函数的参数中，在您的情况下为功能（用户）。因此，在调用返回到回调函数function(users)后，您可以通过users对象来获取服务器端方法对其进行的更新。users对象需要像array一样进行遍历，因为您要返回一个Collection或List无论适用什么。这是您要找的吗？有关此内容的更多信息，请参阅此处。
If you modify your server method
usersOnline()to return theCollection<RosterEntry>object then DWR will populate that in the argument of the callback function which in your case isfunction(users). So after the call is returned back to the callback functionfunction(users)you can go through theusersobject to get the updates made to it by the server side method. Theusersobject will need to be traversed like anarraysince you are returning aCollectionor aListwhatever applies.Is this what you are looking for? More on this can be read here.