我有一个jsp视图，其中显示了一组用户可以修改和保存更改的参数（复选框和测试字段）。 这些参数存储在扩展“环境”实体的名为“ PropertiesEnvironment”的实体中。 我能够正确显示参数，但是当用户进行修改后，我无法确定如何保存更改。
我尝试使用servlet来执行此操作，但是我总是收到Null指针错误。
这是我的PropertiesEnvironment实体：
@Entity
public class PropertiesEnvironment extends Environment implements Serializable {
private PropertiesConfiguration propertiesConfiguration = new PropertiesConfiguration();
public PropertiesEnvironment() {
}
private Long lastPurgeTimestamp;
@Column
public Long getLastPurgeTimestamp() {
return lastPurgeTimestamp;
}
public void setLastPurgeTimestamp(Long lastPurgeTimestamp) {
this.lastPurgeTimestamp = lastPurgeTimestamp;
}
@Column(length=500000)
@Lob
@Type(type = "serializable")
public Map<String, Serializable> getProperties() {
return propertiesConfiguration.getProperties();
}
public void setProperties(Map<String, Serializable> properties) {
propertiesConfiguration.setProperties(properties);
}
public int getIntValue(String tag, String defaultValue) {
return propertiesConfiguration.getIntValue(tag, defaultValue);
}
public int getIntValue(String tag) {
return propertiesConfiguration.getIntValue(tag);
}
public boolean getBooleanValue(String property, String defaultValue) {
return propertiesConfiguration.getBooleanValue(property, defaultValue);
}
public boolean getBooleanValue(String tag) {
return propertiesConfiguration.getBooleanValue(tag);
}
public void setBooleanValue(String tag, boolean value) {
propertiesConfiguration.setBooleanValue(tag, value);
}
public String getStringValue(String tag) {
String v = propertiesConfiguration.getStringValue(tag);
return v == null ? "" : v;
}
public String getStringValue(String tag, String value) {
return propertiesConfiguration.getStringValue(tag, value == null ? "" : value);
}
public void setStringValue(String tag, String value) {
propertiesConfiguration.setStringValue(tag, value);
}
public void setIntValue(String tag, int value) {
propertiesConfiguration.setIntValue(tag, value);
}
这是我的环境实体
@Entity
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@Table(name = "environment")
public class Environment implements Serializable, Cloneable {
private static final long serialVersionUID = -6347094896871928639L;
private long id;
@ManyToOne
private String code;
private String name;
private Set<String> terminals = new TreeSet<String>();
@Id//(generate = GeneratorType.AUTO)
@GeneratedValue
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Column(length = 30)
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
@Column(length = 50)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
我的控制器：
@Controller
public class PickingParametersController {
@Autowired
private EnvironmentRepository environmentRepository;
private PickingParametersRepository pickingParametersRepository;
private EnvironmentPropertiesService environmentPropertiesService;
public PickingParametersController(EnvironmentRepository environmentRepository , PickingParametersRepository pickingParametersRepository) {
this.environmentRepository = environmentRepository;
this.pickingParametersRepository = pickingParametersRepository;
}
@RequestMapping(value = {"/picking"}, method = RequestMethod.POST)
public String select(HttpServletRequest request , Model model2) throws ServletException, IOException {
String selected = request.getParameter("dropDownList");// get param from kendo dropdownlist
List<PropertiesEnvironment> environmentList = pickingParametersRepository.findByCode(selected); // load params by id
model2.addAttribute("properties",environmentList);
return "picking";
}
@RequestMapping(value = "success", method = RequestMethod.POST)
public String save(@ModelAttribute("propertiesEnvironment") PropertiesEnvironment propertiesEnvironment) {
environmentPropertiesService.update(propertiesEnvironment);
return "success";
}
@RequestMapping(value = {"/picking"}, method = RequestMethod.GET)
public String page(Model model) {
List<PropertiesEnvironment> codeList = (List<PropertiesEnvironment>) environmentRepository.findAll();
model.addAttribute("code",codeList);
return "picking";
}
}
我的存储库界面
@Repository
public interface PickingParametersRepository extends CrudRepository<PropertiesEnvironment, String> {
@Query("SELECT E.properties FROM Environment E WHERE E.code = :code")
List<PropertiesEnvironment> findByCode (@Param("code") String code);
环境属性服务
public interface EnvironmentPropertiesService {
public PropertiesEnvironment update(PropertiesEnvironment propertiesEnvironment);
EnvironmentPropertiesServiceImpl
@Transactional
@Service("environmentPropertiesService")
public class EnvironmentPropertiesServiceImpl implements EnvironmentPropertiesService{
@Autowired
private PickingParametersRepository pickingParametersRepository;
@Override
public PropertiesEnvironment update (PropertiesEnvironment propertiesEnvironment){
return pickingParametersRepository.save(propertiesEnvironment);
}
最后是我的JSP页面中的代码行：
<form method="post" modelAttribute="pickingparam" action="${pageContext.request.contextPath }/success">
<c:forEach items="${properties}" var="p">
ID <input type="text" value="${p.id}"><br>
Channel <input type="text" value="${p.channel}"><br><br><br>
Total Lines Assignement <input type="checkbox" name="totalLinesAssignment" value="1" id="id1"
<c:if test="${p.totalLinesAssignment == 'true'}">checked="checked"</c:if>/><br>
Total Lines Support <input type="checkbox" name="totalLinesSupport" value="1" id="id10"
<c:if test="${p.totalLinesSupport == 'true'}">checked="checked"</c:if>/><br>
Total Pick Units Assignement <input type="checkbox" name="totalPickUnitsAssignment" value="2" id="id2"
<c:if test="${p.totalPickUnitsAssignment == 'true'}">checked="checked"</c:if>/><br>
Total Pick Units Support <input type="checkbox" name="totalPickUnitsSupport" value="3" id="id3"
<c:if test="${p.totalPickUnitsSupport == 'true'}">checked="checked"</c:if>/><br>
Inventory Pick Location Activity Type <input type="text" value="${p.inventoryPickLocationActivityType}"><br>
Inventory Stock Location Activity Type <input type="text" value="${p.inventoryStockLocationActivityType}"><br>
Inventory Last Digits EAN <input type="text" value="${p.inventoryLastDigitsEAN}"><br>
Inventory Last Digits SSCC <input type="text" value="${p.inventoryLastDigitsSSCC}"><br>
<input type="submit" value="Save"/>
</c:forEach>
</form>
这是堆栈跟踪：
java.lang.NullPointerException：空 在com.vocognition.ui.web.controller.PickingParametersController.save（PickingParametersController.java:62）〜[classes /：na] 在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）〜[na：1.8.0_181] 在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）〜[na：1.8.0_181] 在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）〜[na：1.8.0_181] 在java.lang.reflect.Method.invoke（Method.java:498）〜[na：1.8.0_181] 在org.springframework.web.method.support.InvocableHandlerMethod.doInvoke（InvocableHandlerMethod.java:209）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest（InvocableHandlerMethod.java:136）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:102）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod（RequestMappingHandlerAdapter.java:877）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:783）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:87）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:991）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:925）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:974）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:877）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在javax.servlet.http.HttpServlet.service（HttpServlet.java:661）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:851）〜[spring-webmvc-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在javax.servlet.http.HttpServlet.service（HttpServlet.java:742）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）〜[tomcat-embed-websocket-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal（HttpPutFormContentFilter.java:109）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:93）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:200）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）〜[spring-web-5.0.8.RELEASE.jar：5.0.8.RELEASE] 在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:198）〜[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:493）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:81）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:342）上[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:800）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:800）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1471）[tomcat-embed-core-8.5.32.jar：8.5.32] 在org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49）上[tomcat-embed-core-8.5.32.jar：8.5.32] 在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149）[na：1.8.0_181] 在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624）[na：1.8.0_181] 在org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-embed-core-8.5.32.jar：8.5.32] 在java.lang.Thread.run（Thread.java:748）[na：1.8.0_181]
请问我如何进行数据库更新？ 感谢您的帮助！