java – RestTemplate无法填充对象

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我有以下代码发送请求并收到响应,似乎所有内容都已配置但代码返回NullPointerException.

我不确定丢失了什么.我打印出了具有正确URL地址的readyURL变量. stackTrace提供的不多.

码

  1. try {
  2.     final String APIKEY = "MYAPI";
  3.     final String URL = "http://api-sandBox.seatwave.com/v2/discovery/events?apikey="
  4.             + APIKEY;
  5.     String readyUrl = URL + "&what=" + name;
  6.     RestTemplate restTemplate = new RestTemplate();
  7.     EventsResponse eventResponse = restTemplate.getForObject(readyUrl,EventsResponse.class);
  9.     System.err.println("seatwave>>>"
  10.             + eventResponse.getEvents().getEvent().size()); //line 245
  11. } catch (NullPointerException e) {
  12.     e.printStackTrace();
  13. }
  16. @XmlRootElement
  17. @XmlAccessorType(XmlAccessType.FIELD)
  18. public class EventsResponse {
  19.     @XmlElement
  20.     private Status status;
  21.     @XmlElement(name = "Paging")
  22.     private Page page;
  23.     @XmlElement
  24.     private Events events;
  26.     public Status getStatus() {
  27.       return status;
  28.     }
  30.     public void setStatus(Status status) {
  31.       this.status = status;
  32.     }
  34.     public Page getPage() {
  35.       return page;
  36.     }
  38.     public void setPage(Page page) {
  39.       this.page = page;
  40.     }
  42.     public Events getEvents() {
  43.       return events;
  44.     }
  46.     public void setEvents(Events events) {
  47.       this.events = events;
  48.     }
  49. }
  51. @XmlRootElement
  52. @XmlAccessorType(XmlAccessType.FIELD)
  53. public class Status {
  54.     @XmlElement(name = "Version")
  55.     private double version;
  56.     @XmlElement(name = "TimeStampUtc")
  57.     private Date timeStampUtc;
  58.     @XmlElement(name = "Code")
  59.     private int code;
  60.     @XmlElement(name = "Message")
  61.     private String message;
  62.     @XmlElement(name = "Details")
  63.     private String details;
  65.    public double getVersion() {
  66.       return version;
  67.    }
  69.     public void setVersion(double version) {
  70.       this.version = version;
  71.     }
  73.     public Date getTimeStampUtc() {
  74.       return timeStampUtc;
  75.     }
  77.     public void setTimeStampUtc(Date timeStampUtc) {
  78.       this.timeStampUtc = timeStampUtc;
  79.     }
  81.     public int getCode() {
  82.      return code;
  83.     }
  85.   public void setCode(int code) {
  86.      this.code = code;
  87.   }
  89.   public String getMessage() {
  90.      return message;
  91.   }
  93.   public void setMessage(String message) {
  94.      this.message = message;
  95.   }
  97.   public String getDetails() {
  98.      return details;
  99.   }
  101.   public void setDetails(String details) {
  102.      this.details = details;
  103.   }
  104. }
  106. @XmlRootElement(name="Page")
  107. @XmlAccessorType(XmlAccessType.FIELD)
  108. public class Page {
  109.     @XmlElement(name="PageNumber")
  110.     private int pageNumber;
  111.     @XmlElement(name="PageSize")
  112.     private int pageSize;
  113.     @XmlElement(name="PageResultCount")
  114.     private int pageResultCount;
  115.     @XmlElement(name="TotalResultCount")
  116.     private int totalResultCount;
  117.     @XmlElement(name="TotalPageCount")
  118.     private int totalPageCount;
  120.     public int getPageNumber() {
  121.       return pageNumber;
  122.     }
  124.     public void setPageNumber(int pageNumber) {
  125.        this.pageNumber = pageNumber;
  126.     }
  128.     public int getPageSize() {
  129.       return pageSize;
  130.    }
  132.    public void setPageSize(int pageSize) {
  133.       this.pageSize = pageSize;
  134.    }
  136.    public int getPageResultCount() {
  137.       return pageResultCount;
  138.    }
  140.    public void setPageResultCount(int pageResultCount) {
  141.       this.pageResultCount = pageResultCount;
  142.    }
  144.    public int getTotalResultCount() {
  145.       return totalResultCount;
  146.    }
  148.    public void setTotalResultCount(int totalResultCount) {
  149.       this.totalResultCount = totalResultCount;
  150.    }
  152.    public int getTotalPageCount() {
  153.       return totalPageCount;
  154.    }
  156.    public void setTotalPageCount(int totalPageCount) {
  157.      this.totalPageCount = totalPageCount;
  158.    }
  160. }
  162. @XmlRootElement
  163. @XmlAccessorType(XmlAccessType.FIELD)
  164. public class Events {
  165.     @XmlElement
  166.     private List

例外

  1. java.lang.NullPointerException
  2.     at com.myproject.tickets.service.TicketSeviceImpl.seatWave(TicketSeviceImpl.java:245)
  3.     at com.myproject.tickets.service.TicketSeviceImpl.findTicket(TicketSeviceImpl.java:45)
  4.     at com.myproject.web.TicketController.findTicket(TicketController.java:29)
  5.     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  6.     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  7.     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  8.     at java.lang.reflect.Method.invoke(Method.java:606)
  9.     at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
  10.     at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
  11.     at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
  12.     at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
  13.     at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
  14.     at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
  15.     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
  16.     at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
  17.     at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
  18.     at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
  19.     at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  20.     at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
  21.     at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
  22.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
  23.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  24.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:369)
  25.     at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
  26.     at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
  27.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  28.     at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
  29.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  30.     at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
  31.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  32.     at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
  33.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  34.     at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:112)
  35.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  36.     at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
  37.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  38.     at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
  39.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  40.     at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177)
  41.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  42.     at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
  43.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  44.     at org.springframework.security.web.authentication.logout.logoutFilter.doFilter(logoutFilter.java:105)
  45.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  46.     at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
  47.     at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:381)
  48.     at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:168)
  49.     at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
  50.     at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
  51.     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
  52.     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  53.     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
  54.     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
  55.     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
  56.     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
  57.     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
  58.     at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
  59.     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
  60.     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
  61.     at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
  62.     at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
  63.     at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
  64.     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
  65.     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
  66.     at java.lang.Thread.run(Thread.java:744)

样本结果

  1. diotdiot-tickets/arts-theatre-tickets/27-september-2015/perf/987509?affid=&appid=2037810diot_32152_1_1_20111209091615.jpg

更新

我在restTemplate.getForObject行之后添加了此代码,但控制台上不会显示任何内容.

  1. if(eventResponse == null)
  2.             {
  3.                 System.err.println("it is null");
  4.             }else{
  6.             System.err.println("message:>>"+eventResponse.getStatus().getMessage());
  7.             }
最佳答案
我能够让Spring的RestTemplate与SeatWave’s API一起工作

这是github上的一个工作示例：https://github.com/cosbor11/seatwave-spring-client-example

以下是步骤：

>在浏览器中输入以下GET URL：

http://api-sandbox.seatwave.com/v2/discovery/events?apikey=4739E4694D0E482A92C9D0B478D83934&what=music
>查看源并将xml复制粘贴到xsd generator中.
>选择俄罗斯娃娃样式生成xsd.
>将生成的内容粘贴到位于以下位置的新文件中：${home} /Desktop/schema.xsd.
>如果它看起来像这样删除第一行：<？xml version =“1.0”encoding =“utf-16”？>
>创建一个binding.xml文件,如下所示：

>创建一个src文件：mkdir src.
>使用XJC将Java Jaxb类生成到该文件夹​​中,如下所示：

xjc -b~ / Desktop / binding.xml -d src -p com.yourcompany~ / Desktop / schema.xsd
>确保将生成的类和包结构复制到构建路径中.
>此外,在构建路径中,使用使用RestTemplate的main方法创建一个类：

  1. public static void main(String args[])
  2. {
  3.     try
  4.     {
  6.         String name = "music";
  7.         final String APIKEY = "4739E4694D0E482A92C9D0B478D83934"; //http://api-sandBox.seatwave.com/v2/discovery/events?apikey=4739E4694D0E482A92C9D0B478D83934&what=music
  8.         final String URL = "http://api-sandBox.seatwave.com/v2/discovery/events?apikey=" + APIKEY;
  9.         String readyUrl = URL + "&what=" + name;
  10.         RestTemplate restTemplate = new RestTemplate();
  11.         EventsResponse eventResponse = restTemplate.getForObject(readyUrl,EventsResponse.class);
  13.         System.err.println("seatwave>>>" + eventResponse.getEvents().getEvent().size());
  14.     }
  15.     catch (NullPointerException e)
  16.     {
  17.         e.printStackTrace();
  18.     }
  19. }

>编译该类并运行main方法.在此示例中,您应该获得50条记录作为大小.请注意,即使将name变量更改为返回空集的内容,也不会有NullPointerExeption.

以下是生成的JAXB类的外观：

EventResponse.java：

  1. @XmlAccessorType(XmlAccessType.FIELD)
  2. @XmlType(name = "",propOrder = {
  3.     "status","paging","events"
  4. })
  5. @XmlRootElement(name = "EventsResponse")
  6. public class EventsResponse {
  8.     @XmlElement(name = "Status",required = true)
  9.     protected Status status;
  10.     @XmlElement(name = "Paging",required = true)
  11.     protected Paging paging;
  12.     @XmlElement(name = "Events",required = true)
  13.     protected Events events;
  15.     //getters & setters

Events.java：

  1. @XmlAccessorType(XmlAccessType.FIELD)
  2. @XmlType(name = "",propOrder = {
  3.     "event"
  4. })
  5. public class Events {
  7.     @XmlElement(name = "Event",required = true)
  8.     protected List

Event.java：

  1. @XmlAccessorType(XmlAccessType.FIELD)
  2. @XmlType(name = "",propOrder = {
  3.     "id","date","eventGroupName","venueName","town","country","ticketCount","currency","minPrice","swURL","eventGroupImageURL","layoutId","eventGroupId","venueId","swSellURL"
  4. })
  5. public class Event {
  7.     @XmlElement(name = "Id")
  8.     protected int id;
  9.     @XmlElement(name = "Date",required = true)
  10.     @XmlSchemaType(name = "dateTime")
  11.     protected XMLGregorianCalendar date;
  12.     @XmlElement(name = "EventGroupName",required = true)
  13.     protected String eventGroupName;
  14.     @XmlElement(name = "VenueName",required = true)
  15.     protected String venueName;
  16.     @XmlElement(name = "Town",required = true)
  17.     protected String town;
  18.     @XmlElement(name = "Country",required = true)
  19.     protected String country;
  20.     @XmlElement(name = "TicketCount")
  21.     protected int ticketCount;
  22.     @XmlElement(name = "Currency",required = true)
  23.     protected String currency;
  24.     @XmlElement(name = "MinPrice",required = true)
  25.     protected BigDecimal minPrice;
  26.     @XmlElement(name = "SwURL",required = true)
  27.     protected String swURL;
  28.     @XmlElement(name = "EventGroupImageURL",required = true)
  29.     protected String eventGroupImageURL;
  30.     @XmlElement(name = "LayoutId")
  31.     protected int layoutId;
  32.     @XmlElement(name = "EventGroupId")
  33.     protected int eventGroupId;
  34.     @XmlElement(name = "VenueId")
  35.     protected int venueId;
  36.     @XmlElement(name = "SwSellURL",required = true)
  37.     protected String swSellURL;
  39.     //getter & setters

Notes:

  • If you are using maven,there are some nifty tools to generate the jaxb classes into your generated-sources folder automatically. I recommend 07004.

  • Notice that Events#getEvent() method returns a new List if the event property is null.

  • The binding.xml file is handy for customizing the way your jaxb is generated,if you play around with it I bet you can figure out how to get the API classes to be interacted with in a more intuitive way. For example in you main class you could get the size by calling eventResponse.getEvents().size() instead of eventResponse.getEvents().getEvent().size().

javajava

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