我在Web应用程序的日期字段上执行选择时遇到问题。 我已经用这种方式定义了数据：
Date data = new Date(System.currentTimeMillis());
SimpleDateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
String dateTemp2 = dateFormat2.format(data.getTime());
risultato_vendita = bean.inserimento_vendita(scontrino,data,prodotto1, quantita1);
在DB data_vendita中，Date字段不为空。插入后，我通过在pgadmin中进行选择来看到这样的日期：2017-04-20
这是进行选择的功能：
public int inserimento_vendita(int scontrino, Date data, String prodotto, int quantita) throws eccezione {
int risultato = 0;
String insert = "INSERT INTO farmacia.vendita (id, data_vendita, prodotto, quantita) "+
"VALUES (?, ?, ?, ?) ";
PreparedStatement stmt = null;
try
{
connect();
stmt = getStatement(insert);
stmt.setInt(1, scontrino);
stmt.setDate(2, data);
stmt.setString(3, prodotto);
stmt.setInt(4, quantita);
risultato = executeUpdate(stmt);
}
catch (SQLException ex) {
System.out.println("\n--- SQLException catturata ---\n");
Logger.getLogger(SessionBean.class.getName()).log(Level.SEVERE, null, ex);} catch (ClassNotFoundException ex) {
Logger.getLogger(SessionBean.class.getName()).log(Level.SEVERE, null, ex);
}
finally
{
try
{
stmt.close();
close();
}
catch (SQLException ex)
{
Logger.getLogger(SessionBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
return risultato;
}
我发现了这个错误：
org.postgresql.util.PSQLException: Bad value for type timestamp/date/time: {1}
at org.postgresql.jdbc.TimestampUtils.parseBackendTimestamp(TimestampUtils.java:358)
at org.postgresql.jdbc.TimestampUtils.toTimestamp(TimestampUtils.java:390)
at org.postgresql.jdbc.TimestampUtils.toDate(TimestampUtils.java:468)
at org.postgresql.jdbc.PgResultSet.getDate(PgResultSet.java:516)
at org.postgresql.jdbc.PgResultSet.getDate(PgResultSet.java:2378)
at session.SessionBean.lista_vendite(SessionBean.java:1030)
at org.apache.jsp.report_jsp._jspService(report_jsp.java:83)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NumberFormatException: Expected time to be colon-separated, got '
这是表格声明：
CREATE TABLE vendita (
id integer NOT NULL,
prodotto character varying(30) NOT NULL,
data_vendita date NOT NULL,
quantita integer NOT NULL
);
编辑：lista_vendite
<%
SessionBean b = new SessionBean();
List<Vendita> lista_vendite = b.lista_vendite();
％GT;
<table class="myTable">
<thead>
<tr>
<th>Codice</th>
<th>Prodotto</th>
<th>Data</th>
</tr>
</thead>
<tbody>
<%
for(Vendita e: lista_vendite){
out.print("<tr><td>"+e.getVenditaPK()+"</td><td>"+e.getQuantita()+"</td><td>"+e.getDataVendita()+"</td></tr>");
}
%>
</tbody>
</table>
编辑：lista_vendite方法
public List<Vendita> lista_vendite() throws eccezione{
int risultato = 0;
VenditaPK venditaPK;
List<Vendita> lista = new ArrayList<Vendita>();
String select = "SELECT * FROM farmacia.vendita";
PreparedStatement stmt = null;
ResultSet res = null;
try
{
connect();
stmt = getStatement(select);
res = executeQuery(stmt);
while(res.next())
{
System.out.println("Iterazione");
Vendita d1 = new Vendita();
venditaPK = new VenditaPK();
d1.setDataVendita(res.getDate(1));
d1.setQuantita(res.getInt(2));
venditaPK.setId(res.getInt("id"));
venditaPK.setProdotto(res.getString("prodotto"));
d1.setVenditaPK(venditaPK);
lista.add(d1);
}
}
catch (SQLException | ClassNotFoundException ex)
{
ex.printStackTrace();
Logger.getLogger(SessionBean.class.getName()).log(Level.SEVERE, null, ex);
}
finally
{
try
{
stmt.close();
res.close();
close();
}
catch (SQLException ex)
{
Logger.getLogger(SessionBean.class.getName()).log(Level.SEVERE, null, ex);
}
}
return lista;
}