Vaadin：绑定一个 byte[] 字段
Vaadin: Bind a byte[] field
我有一个bean如下：
public class Step implements Serializable {
private int stepSequence;
private byte[] text;
private byte[] expectedResult;
private String notes;
...
getters and setters
}
我正在尝试这样绑定：
BeanFieldGroup binder = new BeanFieldGroup(s.getClass());
binder.setItemDataSource(s);
Field<?> sequence = binder.buildAndBind("Sequence", "stepSequence");
layout.addComponent(sequence);
// Field<?> text = binder.buildAndBind("Text", "text");
// layout.addComponent(text);
// Field<?> result = binder.buildAndBind("Expected Result", "expectedResult");
// layout.addComponent(result);
Field<?> notes = binder.buildAndBind("Notes", "notes");
layout.addComponent(notes);
补充字段出现以下错误：
com.vaadin.data.Buffered$SourceException
at com.vaadin.ui.AbstractField.setPropertyDataSource(AbstractField.java:667)
at com.vaadin.data.fieldgroup.FieldGroup.bind(FieldGroup.java:274)
at com.vaadin.data.fieldgroup.BeanFieldGroup.bind(BeanFieldGroup.java:155)
at com.vaadin.data.fieldgroup.FieldGroup.buildAndBind(FieldGroup.java:1207)
at com.vaadin.data.fieldgroup.BeanFieldGroup.buildAndBind(BeanFieldGroup.java:162)
at com.vaadin.data.fieldgroup.FieldGroup.buildAndBind(FieldGroup.java:1185)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.displayStep(ValidationManagerUI.java:205)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.displayStep(ValidationManagerUI.java:193)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.lambda$buildProjectTreea09dcf(ValidationManagerUI.java:721)
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 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:200)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:163)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1015)
at com.vaadin.ui.AbstractField.fireValueChange(AbstractField.java:1164)
at com.vaadin.ui.AbstractField.setValue(AbstractField.java:572)
at com.vaadin.ui.AbstractSelect.setValue(AbstractSelect.java:739)
at com.vaadin.ui.AbstractField.setValue(AbstractField.java:469)
at com.vaadin.ui.AbstractSelect.changeVariables(AbstractSelect.java:549)
at com.vaadin.ui.Tree.changeVariables(Tree.java:568)
at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:608)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:458)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:408)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
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.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
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:217)
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:142)
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:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.vaadin.data.util.converter.Converter$ConversionException: Unable to convert value of type [B to presentation type class java.lang.String. No converter is set and the types are not compatible.
at com.vaadin.data.util.converter.ConverterUtil.convertFromModel(ConverterUtil.java:118)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:738)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:723)
at com.vaadin.ui.AbstractField.setPropertyDataSource(AbstractField.java:659)
... 55 more
如何添加上述转换器？
还有其他方法可以实现吗？
我一直在四处寻找，并且能够让它发挥作用。以下是找到此问题的其他人的答案：
TextField text = new TextField("Text");
text.setConverter(new ByteToStringConverter());
binder.bind(text, "text");
layout.addComponent(text);
TextField result = new TextField("Expected Result");
result.setConverter(new ByteToStringConverter());
binder.bind(result, "expectedResult");
layout.addComponent(result);
和转换器：
private static class ByteToStringConverter implements Converter<String, byte[]> {
@Override
public byte[] convertToModel(String value,
Class<? extends byte[]> targetType,
Locale locale) throws ConversionException {
try {
return value.getBytes("UTF-8");
} catch (UnsupportedEncodingException ex) {
Exceptions.printStackTrace(ex);
}
return null;
}
@Override
public String convertToPresentation(byte[] value,
Class<? extends String> targetType, Locale locale)
throws ConversionException {
return new String(value, StandardCharsets.UTF_8);
}
@Override
public Class<byte[]> getModelType() {
return byte[].class;
}
@Override
public Class<String> getPresentationType() {
return String.class;
}
}
我有一个bean如下：
public class Step implements Serializable {
private int stepSequence;
private byte[] text;
private byte[] expectedResult;
private String notes;
...
getters and setters
}
我正在尝试这样绑定：
BeanFieldGroup binder = new BeanFieldGroup(s.getClass());
binder.setItemDataSource(s);
Field<?> sequence = binder.buildAndBind("Sequence", "stepSequence");
layout.addComponent(sequence);
// Field<?> text = binder.buildAndBind("Text", "text");
// layout.addComponent(text);
// Field<?> result = binder.buildAndBind("Expected Result", "expectedResult");
// layout.addComponent(result);
Field<?> notes = binder.buildAndBind("Notes", "notes");
layout.addComponent(notes);
补充字段出现以下错误：
com.vaadin.data.Buffered$SourceException
at com.vaadin.ui.AbstractField.setPropertyDataSource(AbstractField.java:667)
at com.vaadin.data.fieldgroup.FieldGroup.bind(FieldGroup.java:274)
at com.vaadin.data.fieldgroup.BeanFieldGroup.bind(BeanFieldGroup.java:155)
at com.vaadin.data.fieldgroup.FieldGroup.buildAndBind(FieldGroup.java:1207)
at com.vaadin.data.fieldgroup.BeanFieldGroup.buildAndBind(BeanFieldGroup.java:162)
at com.vaadin.data.fieldgroup.FieldGroup.buildAndBind(FieldGroup.java:1185)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.displayStep(ValidationManagerUI.java:205)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.displayStep(ValidationManagerUI.java:193)
at net.sourceforge.javydreamercsw.validation.manager.web.ValidationManagerUI.lambda$buildProjectTreea09dcf(ValidationManagerUI.java:721)
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 com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:510)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:200)
at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:163)
at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1015)
at com.vaadin.ui.AbstractField.fireValueChange(AbstractField.java:1164)
at com.vaadin.ui.AbstractField.setValue(AbstractField.java:572)
at com.vaadin.ui.AbstractSelect.setValue(AbstractSelect.java:739)
at com.vaadin.ui.AbstractField.setValue(AbstractField.java:469)
at com.vaadin.ui.AbstractSelect.changeVariables(AbstractSelect.java:549)
at com.vaadin.ui.Tree.changeVariables(Tree.java:568)
at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:608)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:458)
at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:408)
at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:273)
at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1422)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:379)
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.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
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:217)
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:142)
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:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.vaadin.data.util.converter.Converter$ConversionException: Unable to convert value of type [B to presentation type class java.lang.String. No converter is set and the types are not compatible.
at com.vaadin.data.util.converter.ConverterUtil.convertFromModel(ConverterUtil.java:118)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:738)
at com.vaadin.ui.AbstractField.convertFromModel(AbstractField.java:723)
at com.vaadin.ui.AbstractField.setPropertyDataSource(AbstractField.java:659)
... 55 more
如何添加上述转换器？
还有其他方法可以实现吗？
我一直在四处寻找，并且能够让它发挥作用。以下是找到此问题的其他人的答案：
TextField text = new TextField("Text");
text.setConverter(new ByteToStringConverter());
binder.bind(text, "text");
layout.addComponent(text);
TextField result = new TextField("Expected Result");
result.setConverter(new ByteToStringConverter());
binder.bind(result, "expectedResult");
layout.addComponent(result);
和转换器：
private static class ByteToStringConverter implements Converter<String, byte[]> {
@Override
public byte[] convertToModel(String value,
Class<? extends byte[]> targetType,
Locale locale) throws ConversionException {
try {
return value.getBytes("UTF-8");
} catch (UnsupportedEncodingException ex) {
Exceptions.printStackTrace(ex);
}
return null;
}
@Override
public String convertToPresentation(byte[] value,
Class<? extends String> targetType, Locale locale)
throws ConversionException {
return new String(value, StandardCharsets.UTF_8);
}
@Override
public Class<byte[]> getModelType() {
return byte[].class;
}
@Override
public Class<String> getPresentationType() {
return String.class;
}
}