Struts2 REST插件:通过PUT发送JSON对象

问题描述 投票:2回答:2

我正在使用Struts2和Struts2 REST插件编写RESTful服务。目前,我的服务能够毫无问题地处理GET请求,但我一直试图让“更新”(PUT)请求工作。

我有两个可能的模型,一个是show()的List和一个用于update()的ClientFeature对象,其中ClientFeature是一个pojo类。

REST控制器:

public class ClientfeatureController extends ControllerParent implements ModelDriven<Object> {

    private ClientFeature clientFeature = new ClientFeature();
    private List<ClientFeature> clientFeatureList;

    //Client ID
    private String id;

    public ClientfeatureController() {
        super(ClientfeatureController.class);
    }

    @Override
    public Object getModel() {
        return (clientFeatureList != null ? clientFeatureList : clientFeature);
    }

    /**
     * @return clientFeatureList through Struts2 model-driven design
     */
    public HttpHeaders show() {
        -logic for GET request here..-
        //todo: add ETag and lastModified information for client caching purposes
        return new DefaultHttpHeaders("show").disableCaching();
    }

    // PUT request: /clientfeature/update/<id> + JSON data
    public String update() {
        logger.info("client id: " + id);
        logger.info("updated model test:" + clientFeature.getClientId());
        return "update";
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public List<ClientFeature> getClientFeatureList() {
        return clientFeatureList;
    }

    public void setClientFeatureList(List<ClientFeature> clientFeatureList) {
        this.clientFeatureList = clientFeatureList;
    }
}

ClientFeature:

    public class ClientFeature {
    private Long clientId;
    private Feature feature;
    private ArrayList<String> countries;

    public ClientFeature() {
        this.countries = new ArrayList<String>();
    }

    public Long getClientId() {
        return clientId;
    }

    public void setClientId(Long clientId) {
        this.clientId = clientId;
    }

    public Feature getFeature() {
        return feature;
    }

    public void setFeature(Feature feature) {
        this.feature = feature;
    }

    public ArrayList<String> getCountries() {
        return countries;
    }

    public void setCountries(ArrayList<String> countries) {
        this.countries = countries;
    }
}

我正在使用Postman扩展程序测试服务以获取chrome并发送JSON数据,例如:

{
 "clientFeature": {
   "feature" : {"featureId" : 999, "featureName" : "testFeature"}
   "countries": ["CA","US"]
   "clientId" : 001
 }
}

而错误:

356572 [http-bio-8080-exec-6] WARN  net.sf.json.JSONObject  - Tried to assign property clientFeature:java.lang.Object to bean of class com.foo.bar.ClientFeature

我对相关的一切都很陌生,所以任何帮助都会非常感激。

编辑:

尝试发送以下JSON:

{“com.foo.entity.clientFeature”:{“clientId”:10}}

并得到以下完整错误:

1016894 [http-bio-8080-exec-3] ERROR freemarker.runtime  - Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object

Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object
The problematic instruction:
----------
==> ${msg[0]} [on line 68, column 29 in org/apache/struts2/dispatcher/error.ftl]
----------

Java backtrace for programmers:
----------
freemarker.template.TemplateModelException: Method public java.lang.String org.apache.commons.lang.exception.NestableRuntimeException.getMessage(int) threw an exception when invoked on net.sf.json.JSONException: Error while setting property=com.foo.entity.clientFeature type class java.lang.Object
    at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
    at freemarker.ext.beans.SimpleMethodModel.get(SimpleMethodModel.java:138)
    at freemarker.core.DynamicKeyName.dealWithNumericalKey(DynamicKeyName.java:111)
    at freemarker.core.DynamicKeyName._getAsTemplateModel(DynamicKeyName.java:90)
    at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
    at freemarker.core.Expression.getStringValue(Expression.java:93)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.IfBlock.accept(IfBlock.java:82)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:179)
    at freemarker.core.Environment.visit(Environment.java:417)
    at freemarker.core.IteratorBlock.accept(IteratorBlock.java:102)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.IfBlock.accept(IfBlock.java:82)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.MixedContent.accept(MixedContent.java:92)
    at freemarker.core.Environment.visit(Environment.java:210)
    at freemarker.core.Environment.process(Environment.java:190)
    at freemarker.template.Template.process(Template.java:237)
    at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:797)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:519)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:851)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:278)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.NullPointerException
    at freemarker.ext.beans.SimpleMemberModel.unwrapArguments(SimpleMemberModel.java:85)
    at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)
    ... 43 more
java json rest struts2 struts2-json-plugin
2个回答
0
投票

通过使用正确的JSON语法解决了这个问题。

如果有人遇到类似的东西,在我的情况下,正确的语法是:

{clientFeature: {"feature":{"id":3,"enabled":true,"description":"description here","type":"FEATURE_TYPE_HERE"},"countries":["SG"],"clientId":10}}

0
投票

我想解释一下使用Struts2 rest插件开发API时我发现了什么。您应该了解rest插件如何管理暴露于外部世界的bean(json,xml等)

我已经坚持了一天才弄明白我的json怎么没有正确地转换成我的bean列表。

所以,这是我的json字符串:

{ 
"messagesList": [{
    "id": "E57EC40F",
    "body": "Ok!",
    ... other_property
},{
    "id": "25B42CC8CCE57EC40F",
    "body": "Testing",
    ... other_property
}],
"ackList": [{
    "id": "5B42CC8CCE57EC40F",
    "queueNumber": 100,
    "chatId": "3434",
    "status": "delivered"
},{
    "id": "E6A25B42CC8CCE57EC40F",
    "queueNumber": 100,
    "chatId": "1747",
    "status": "viewed"
}]
}

有了这个json,我假设我可以通过添加属性自动将json转换到我的列表

 List<OurModel> messageList;
 List<OurModel> ack;

在我的控制器中。所以我的错误控制器看起来像这样:



@ParentPackage("api-pesan")
@Namespace("/api/pesan")
    public class RetrieveMessageApi implements ModelDriven<Object> {
    @Autowired
    WebHookService webHookService;

    Object retModal;
    List<OurModel> messagesList;
    List<OurModel> ack;
    public HttpHeaders create() throws IOException {

        System.out.println(messagesList.toString());

        System.out.println(ack.toString());

        return new DefaultHttpHeaders("create");
    }


    public Object getModel() {
        return model;
    }

//setter and getter

 }

如果你假设你可以在create方法中打印messagesList和ack属性,那你就错了。我被困了一天才弄明白。这是我对如何将json发布到我们的strtus2 rest插件的解释。

首先,struts2中的rest插件只有在检索并将对象返回到外部restful url时才会读取对象(属性名称,对象作为类型)。

到那时,我创建了我的类(pojo)来包装我的列表。这个班看起来像这样


public class WrapperModel implements Serializable {

    private List<YourObject> messages;
    private List<YourObject> ack;

//setter getter

}

你会注意到,我们的json结构看起来与这个类相同。所以这是我完整且成功的cotroller类,它可以正确地获取json并绑定到我们的属性。

@ParentPackage("api-pesan")
public class RetrieveMessageApi implements ModelDriven<Object> {

    @Autowired
    WebHookService webHookService;

    Object model = new WrapperModel();

    public HttpHeaders create() throws IOException {

        System.out.println(model.toString());


        return new DefaultHttpHeaders("create");
    }



    public Object getModel() {
        return model;
    }

}

然后尝试通过http://localhost:8080/app/api/api-pesan/retrieve-message.json和方法发布命中并发送json,也将你的json作为正文发送。

结果,您将在日志控制台上看到我们的属性中的列表字符串来自我们的json。

谢谢,希望这能帮到你们....

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