我正在从网站上删除数据并将其存储在CSV文件中。当数据进入CSV文件时，它会在每行的最后一个位置获得逗号。不知怎的，我设法处理它。但是，现在我在创建另一列的每一行的开头都得到了逗号。以下是我的代码。
for (Iterator<Element> it = tdElements.iterator(); it.hasNext();) {
if (it.hasNext()) {
sb.append(" \n ");
}
for (Iterator<Element> it2 = trElement2.iterator(); it.hasNext();) {
Element tdElement = it.next();
final String content = tdElement.text();
if (it2.hasNext()) {
sb.append(" , ");
sb.append(formatData(content));
}
if (!it2.hasNext()) {
String content1 = content.replaceAll(",$", " ");
sb.append(formatData(content1));
break;
} //to remove last placed Commas.
}
System.out.println(sb.toString());
sb.flush();
sb.close();
我想要的结果例如：a，b，c，d，e
我得到的结果例如：a，b，c，d，e
答案 0 :(得分：3)
如果您正在使用Java 8开发，我建议您使用StringJoiner。通过这个新课程，您不必自己构建字符串。您可以找到使用var ui = SpreadsheetApp.getUi();
var response = ui.prompt('May I know your name?', ui.ButtonSet.YES_NO);
here创建CSV的示例。
我希望它有所帮助。
答案 1 :(得分：0)
StringBuffer sb = new StringBuffer(" ");
for (Iterator<Element> it = tdElements.iterator(); it.hasNext();) {
if (it.hasNext()) {
sb.deleteCharAt(sb.length() - 1);
sb.append(" \n ");
}
for (Iterator<Element> it2 = trElement2.iterator(); it.hasNext();) {
Element tdElement = it.next();
final String content = tdElement.text();
if (it2.hasNext()) {
sb.append(formatData(content));
sb.append(",");
}
if (!it2.hasNext()) {
String content1 = content.replaceAll(",$", " ");
sb.append(formatData(content1));
break;
} //to remove last placed Commas.
}
System.out.println(sb.toString());
sb.flush();
sb.close();
}
我尝试remove character , instance where it is trying to move to a new line instantiate stringbuffer space尝试替换我的代码
并确保 <?php
$consulta = mysqli_query($conexao,"SELECT exercicios.nome_exercicio AS nome_exc , exercicios.repeticoes_exercicio AS rep_exc , exercicios.serie AS serie_exc FROM exercicios
INNER JOIN usuarios ON usuarios.id_usuario = exercicios.id_usuario
WHERE id_usuario = usuarios.id_usuario
");
if(mysqli_num_rows($consulta) > 0)
{
while ($exercicio = mysqli_fetch_assoc($consulta))
{
echo "<div class='table-responsive'><table class='table table-responsive'>
<tr><td></td><td>Nome</td><td>Repetições</td><td>Série</td></tr>
<td>'".$exercicio['nome_exc']."'</td>
<td>'".$exercicio['rep_exc']."'</td>
<td>'".$exercicio['serie_exc']."'</td>
</table></div> ";
}
}
else {
echo "Seu instrutor ainda não cadastrou exercícios";
}
?>
以java.lang.IllegalStateException: Cannot call sendError() after the response has been committed
at org.apache.catalina.connector.ResponseFacade.sendError(ResponseFacade.java:478)
at org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.handleHttpMessageNotWritable(DefaultHandlerExceptionResolver.java:344)
at org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.doResolveException(DefaultHandlerExceptionResolver.java:131)
at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:136)
at org.springframework.web.servlet.DispatcherServlet.processHandlerException(DispatcherServlet.java:1120)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:944)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:279)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
作为字符串传递。