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SpringBoot:如何使用WrapperClass将两个JSON pojo绑定到两个独立的对象中，并将它们保存到我的



我使用了Wrapper class将这两个对象都保存在JSON中，但当我试图在控制器中使用@RequestBody获取它时，我得到了一个NullPointerException。我认为代码结构在理解中会更有意义。

型号-SupMain.java


private Supplier supplier;
private Supplier_Part supplierPart;
public SupMain(Supplier supplier, Supplier_Part supplierPart) {
this.supplier = supplier;
this.supplierPart = supplierPart;
}
public Supplier getSupplier() {
return supplier;
}
public Supplier_Part getSupplierPart() {
return supplierPart;
}

}

供应商.java

@Table
public class Supplier {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long sup_Id;
private String sup_name;
private String sup_mailId;
private int sup_phoneNo;
private String sup_location;
private String sup_feedback;
public Supplier_Part getSupplier_part() {
return supplier_part;
}
public void setSupplier_part(Supplier_Part supplier_part) {
this.supplier_part = supplier_part;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "part_Id",nullable=false,unique=true)
private Supplier_Part supplier_part;

public Supplier() { }
public Supplier(Long sup_Id, String sup_name, String sup_mailId, int sup_phoneNo, String sup_location, String sup_feedback) {
this.sup_Id = sup_Id;
this.sup_name = sup_name;
this.sup_mailId = sup_mailId;
this.sup_phoneNo = sup_phoneNo;
this.sup_location = sup_location;
this.sup_feedback = sup_feedback;
}

public Long getSup_Id() {
return sup_Id;
}
public void setSup_Id(Long sup_Id) {
this.sup_Id = sup_Id;
}
public String getSup_name() {
return sup_name;
}
public void setSup_name(String sup_name) {
this.sup_name = sup_name;
}
public String getSup_mailId() {
return sup_mailId;
}
public void setSup_mailId(String sup_mailId) {
this.sup_mailId = sup_mailId;
}
public int getSup_phoneNo() {
return sup_phoneNo;
}
public void setSup_phoneNo(int sup_phoneNo) {
this.sup_phoneNo = sup_phoneNo;
}
public String getSup_location() {
return sup_location;
}
public void setSup_location(String sup_location) {
this.sup_location = sup_location;
}
public String getSup_feedback() {
return sup_feedback;
}
public void setSup_feedback(String sup_feedback) {
this.sup_feedback = sup_feedback;
}


@Override
public String toString() {
return "Supplier{" +
"sup_Id=" + sup_Id +
", sup_name='" + sup_name + ''' +
", sup_mailId='" + sup_mailId + ''' +
", sup_phoneNo=" + sup_phoneNo +
", sup_location='" + sup_location + ''' +
", sup_feedback='" + sup_feedback + ''' +
'}';
}
}

同样，我还有另一个Supplier_Part实体。我有两个扩展CRUD的存储库和一个控制器，我试图在其中保留POST的休息端点，在那里我想从JSON中获取两个对象并将它们存储到我的DB中。

SupplierController.java


@Controller
public class SuppliersController {
@Autowired
SupplierService supplierService;
@Autowired
Supplier_PartRepoistory supplier_partRepoistory;
@Autowired
SupplierRepository supplierRepository;
@RequestMapping("/suppliers/{id}")
public List<Supplier> getAllSuppliers(@Param("id") Long id){
return supplierService.getSupliersByPart(id);
}
@RequestMapping("/addSuppliers",method = RequestMethod.POST)
public Supplier addSupplier(@RequestBody SupMain supMain){
Supplier supplier=supMain.getSupplier();
System.out.println(supplier);
Supplier_Part supplierPart=supMain.getSupplierPart();
List<Supplier> list=new ArrayList<>();
list.add(supplier);

supplierPart.setSupplierList(list);
supplier.setSupplier_part(supplierPart);
supplierRepository.save(supplier);
supplier_partRepoistory.save(supplierPart);
return supplier;

}
}

这就是我的JSON数据看起来像的样子

{
"Supplier":{
"sup_Id":1,
"sup_name":"Arpita",
"sup_mailId":"arpitamitra",
"sup_phoneNo":"98856565",
"sup_location":"bakers street",
"sup_feedback":"Best"
},

"Supplier_Part":{
"part_Id":1,
"part_name":"Monitor",
"part_desc":"xyzzz",
"part_quantity":20,
"part_timePeriod":5
}
}

出现500内部服务器错误

java.lang.NullPointerException: null
at com.cognizant.Suppliers.Controller.SuppliersController.addSupplier(SuppliersController.java:46) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]

提前感谢一吨！

这是关键"供应商"；以及"；Supplier_Part"；不让数据绑定到您的SupMain类属性的输入"；供应商"；以及supplier_part"；。它应该与类属性具有相同的大小写。重命名它并尝试，我相信它应该工作。

JSON数据需要更新！

{
"supplier":{
"sup_Id":1,
"sup_name":"Arpita",
"sup_mailId":"arpitamitra",
"sup_phoneNo":"98856565",
"sup_location":"bakers street",
"sup_feedback":"Best"
},

"supplierPart":{
"part_Id":1,
"part_name":"Monitor",
"part_desc":"xyzzz",
"part_quantity":20,
"part_timePeriod":5
}
}

而不是供应商和供应商零件！SupMain类有两个私有变量名称supplier和supplierPart

谢谢！

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