我的HTML格式为
<input type="hidden" name="SONGS" value="6242,6243,6289,6290,6291,6292,6293,6294,6295,6296,6297,6298,">
<tr>
<td>
01 - Big Love.WAV
</td>
<td>
<input type="text" name="6242TRACK" value="01">
</td>
<td>
<input type="text" name="6242ARTIST" value="Fleetwood Mac">
</td>
<td>
<input type="text" name="6242ARTIST_SORT" value="Fleetwood Mac">
</td>
<td>
<input type="text" name="6242TITLE" value="Big Love">
</td>
</tr>
<tr>
<td>
02 - Seven Wonders.WAV
</td>
<td>
<input type="text" name="6243TRACK" value="02">
</td>
<td>
<input type="text" name="6243ARTIST" value="Fleetwood Mac">
</td>
<td>
<input type="text" name="6243ARTIST_SORT" value="Fleetwood Mac">
</td>
<td>
<input type="text" name="6243TITLE" value="Seven Wonders">
</td>
</tr>
用户提交表单数据时,将使用Spark框架对其进行处理。我的逻辑是从SONGS输入字段中获取Recno列表,然后为每个recNo浏览以该Recno开头的输入字段。但是它不起作用,我想我误解了queryMaps是如何工作的
protected void saveData(Request req)
{
String[] recNos = req.queryParams(EditSongsPage.SONGS).split(",");
for(String recNo:recNos)
{
System.out.println("recNo--------------"+recNo);
for(String next:req.queryMap(recNo).values())
{
System.out.println(next);
}
}
}
但这给
recNo--------------6242
02/03/2018 08.58.22:GMT:com.jthink.songkong.server.callback.ServerEditSongs:startTask:SEVERE: null
java.lang.NullPointerException
at spark.QueryParamsMap.values(QueryParamsMap.java:262)
at com.jthink.songkong.server.callback.ServerEditSongs.saveData(ServerEditSongs.java:80)
at com.jthink.songkong.server.callback.ServerEditSongs.startTask(ServerEditSongs.java:52)
at com.jthink.songkong.server.CmdRemote.lambda$null$62(CmdRemote.java:171)
at spark.RouteImpl$1.handle(RouteImpl.java:72)
at spark.http.matching.Routes.execute(Routes.java:61)
at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:130)
at spark.embeddedserver.jetty.JettyHandler.doHandle(JettyHandler.java:50)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1568)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:564)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:673)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:591)
at java.lang.Thread.run(Thread.java:745)
最佳答案
QueryMap从HttpRequest复制请求参数的内容,并将值放入以参数名称作为键的映射中。
因为复制了HttpRequest的内容,所以可以将querymap的值传递到另一个线程上的进程并相应地使用它,而一旦接收到请求的页面已发送回HttpResponse,就将擦除HttpRequest对象的内容。
这似乎是QueryMap的主要优势