我调用一个方法来获取包含我需要的值的字符串。之后，我尝试将该字符串转换为带有 float 的数组列表。 这个想法是使用 for 来获取数组的位置以提交每个值。 但问题是我收到此错误:
java.lang.NumberFormatException:对于输入字符串:“[60.0]”
这是我的代码:
private String obtenerPrecios (String ids) {
System.out.println("ids parametro: :" + ids);
try{
Session session=HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
List<String> listaIds = new ArrayList<String>();
//System.out.println("ids lista: :" + listaIds);
List<String> idsList = Arrays.asList(ids.split(","));
// System.out.println("idsList :" + idsList);
List<Integer> iList = idsList.stream().map(Integer::valueOf).collect(Collectors.toList());
//System.out.println("idsList int :" + iList);
List result = session.createQuery("SELECT p.precioUnidad FROM Productos p WHERE p.id IN :stringIds").setParameterList("stringIds", iList).list();
//System.out.println("resutlado query :" + result);
session.getTransaction().commit();
session.close();
// System.out.println("precios :" + result);
//listaIds.toString();
// System.out.println("lista a string :" + result.toString());
return result.toString();
}catch(Exception e){
e.printStackTrace();
return "error";
}
}
@RequestMapping ( method = RequestMethod.POST )
public String confirmarVenta (@RequestParam(value = "check", required = true) String checkboxValores, Model model){
System.out.println(checkboxValores +": String con ids");
try{
Session session=HibernateUtil.getSessionFactory().openSession();
session.beginTransaction();
Venta vnt = new Venta();
Productos prdcts = new Productos();
int idVenta = generarID();
// List ids = Arrays.asList(checkboxValores);
System.out.println(checkboxValores +": Array con ids");
// List result = session.createQuery("from Productos where id=" + ids).list();
// System.out.println(result + "result");
for( int i=0; i < checkboxValores.length(); i++){
System.out.println("ids :" + checkboxValores );
int idP;
String precioQ;
idP = Character.getNumericValue(checkboxValores.charAt(i));
System.out.println("idp :" + idP);
precioQ = obtenerPrecios (checkboxValores);
System.out.println("precioQ :" + precioQ);
List<String> idsList = Arrays.asList(precioQ.split(","));
System.out.println("idsList :" + idsList);
Float [] precioLista = idsList.stream().map(Float::valueOf).toArray(Float[]::new);
// System.out.println("precioLista : " +precioLista);
// System.out.println("precioLista get clas : " +precioLista.getClass());
// System.out.println("precioLista I: " +precioLista[i]);
vnt.setFechaVenta(getCurrentDate());
System.out.println(idVenta + ": id venta");
vnt.setIdVenta(idVenta);
// System.out.println(" precio posicion i: " + precioLista.get(i));
// System.out.println(" precio posicion i get class: " + precioLista.get(i).getClass() );
System.out.println("aca llega");
vnt.setMonto(precioLista[i]);
vnt.setIdProducto(idP);
//vnt.setIdUsuario(id); pasar por url el id del empleado y pasarlo como parametro.
session.save(vnt);
model.addAttribute(vnt);
session.getTransaction().commit();
}
session.close();
return "transicionVenta";
}catch(Exception e){
e.printStackTrace();
return"error";
}
}
}
这是日志:
Información: 4: String con ids
Información: 4: Array con ids
Información: ids :4
Información: idp :4
Información: ids parametro: :4
Información: precioQ :[60.0]
Información: idsList :[[60.0]]
Grave: java.lang.NumberFormatException: For input string: "[60.0]"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122)
at java.lang.Float.parseFloat(Float.java:451)
at java.lang.Float.valueOf(Float.java:416)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
at Controladores.CVentas.confirmarVenta(CVentas.java:139)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
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:416)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
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:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
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:283)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
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$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:745)
最佳答案
您转换List至String ，它将您的值包装到 [] 中人物。那么这些字符会阻止您正确拆分列表。
不要这样做，只需返回 List 本身，或者将其事件强制转换为 List<String> 。然后您就可以更轻松地使用它:
private List<String> obtenerPrecios(String ids) {
// ... your retrieval here ...
return (List<String>) result;
}
@RequestMapping ( method = RequestMethod.POST )
public String confirmarVenta(@RequestParam(value = "check") String checkboxValores, Model model) {
// ... your business logic here ...
Float [] precioLista = obtenerPrecios(checkboxValores).stream()
.map(Float::valueOf)
.toArray(Float[]::new);
}
这也是没有意义的:
vnt.setMonto(precioLista[i]);
因为i属于数组checkboxValores ，当您将它用于另一个数组时。不保证索引匹配。这很可能会产生 IndexOutOfBoundException当大小为checkboxValores时是2个或更多。
顺便说一句，如果您的 SQL 语句预计始终返回单个值，您可能只想返回第一个值:
private String obtenerPrecios(String ids) {
// ... your retrieval here ...
if (result.size != 1) {
throw new IllegalStateException("Single result is expected from database!");
}
return result.get(0);
}
P.S.:发生异常时不要回滚事务，这可能会导致其他问题。
P.P.S.:正如您已经使用的 Spring Framework ，考虑使用JDBCTemplate - 它将帮助您避免常见错误。
关于java - 在java : java. lang.NumberFormatException中解析 float 时出现问题:对于输入字符串: "[60.0]"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60356553/