如何放置子BeanParam

时间：2017-04-27 15:00:19

标签： java java-ee jersey jax-rs wildfly

我正在使用Jax-rs，并且有一种方法可以在其帖子中接收复杂对象。

所以我试图让BeanParam para接收它。

这是服务POST方法：

@POST
public void create(@BeanParam BeanNewPack newPack) {
    newPack.getPacks().stream().forEach(pack::insert);
}

在我的BeanNewPack中，我正在放置字段并使用FormParam进行注释（因为我正在接收POST）。我正在制作两个Long字段和另一个BeanParam的List。检查以下内容：

@FormParam("id_from")
private Long idFrom;

@FormParam("id_store")
private Long idStore = -1L;

@FormParam("products_to")
private List<ProductsTo> productsTo;

所以在我的产品中我有以下字段：

@FormParam("id")
private Long id;

@FormParam("amount")
private double amount;

@FormParam("percent")
private double pricePercent;

我的意图是发布一个像这样的json：

{
  "id_from": 1,
  "id_store": -1,
  "products_to": [
    {"id": 2, "amount": 1, "porcent": 0.5},
    {"id": 3, "amount": 1, "porcent": 0.5}
  ]  
}

现在我正在使用Wildfly 10，所以当我尝试部署应用程序时，请获取以下错误：

11:32:47,881 ERROR [org.jboss.msc.service.fail] (ServerService Thread Pool -- 63) MSC000001: Failed to start service jboss.undertow.deployment.default-server.default-host./: org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./: java.lang.RuntimeException: RESTEASY003875: Unable to find a constructor that takes a String param or a valueOf() or fromString() method for javax.ws.rs.FormParam("produtos_para") on private java.util.List ....services.pack.pack.BeanNovoPack.produtosPara for basetype: ....services.pack.servicos.pack.ProdutoPara
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:85)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
    at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: java.lang.RuntimeException: RESTEASY003875: Unable to find a constructor that takes a String param or a valueOf() or fromString() method for javax.ws.rs.FormParam("produtos_para") on private java.util.List br.com.softbox.ivendas.servicos.pack.BeanNovoPack.produtosPara for basetype: br.com.softbox.ivendas.servicos.pack.ProdutoPara
    at org.jboss.resteasy.core.StringParameterInjector.initialize(StringParameterInjector.java:220)
    at org.jboss.resteasy.core.StringParameterInjector.<init>(StringParameterInjector.java:64)
    at org.jboss.resteasy.core.FormParamInjector.<init>(FormParamInjector.java:28)
    at org.jboss.resteasy.core.InjectorFactoryImpl.createParameterExtractor(InjectorFactoryImpl.java:176)
    at org.jboss.resteasy.cdi.CdiInjectorFactory.createParameterExtractor(CdiInjectorFactory.java:124)
    at org.jboss.resteasy.core.PropertyInjectorImpl.getParameterExtractor(PropertyInjectorImpl.java:118)
    at org.jboss.resteasy.core.PropertyInjectorImpl.populateMap(PropertyInjectorImpl.java:66)
    at org.jboss.resteasy.core.PropertyInjectorImpl.<init>(PropertyInjectorImpl.java:54)
    at org.jboss.resteasy.core.InjectorFactoryImpl.createPropertyInjector(InjectorFactoryImpl.java:65)
    at org.jboss.resteasy.cdi.CdiInjectorFactory.createPropertyInjector(CdiInjectorFactory.java:113)
    at org.jboss.resteasy.core.FormInjector.<init>(FormInjector.java:37)
    at org.jboss.resteasy.core.InjectorFactoryImpl.createParameterExtractor(InjectorFactoryImpl.java:119)
    at org.jboss.resteasy.cdi.CdiInjectorFactory.createParameterExtractor(CdiInjectorFactory.java:52)
    at org.jboss.resteasy.core.MethodInjectorImpl.<init>(MethodInjectorImpl.java:44)
    at org.jboss.resteasy.core.InjectorFactoryImpl.createMethodInjector(InjectorFactoryImpl.java:77)
    at org.jboss.resteasy.cdi.CdiInjectorFactory.createMethodInjector(CdiInjectorFactory.java:58)
    at org.jboss.resteasy.core.ResourceMethodInvoker.<init>(ResourceMethodInvoker.java:99)
    at org.jboss.resteasy.core.ResourceMethodRegistry.processMethod(ResourceMethodRegistry.java:281)
    at org.jboss.resteasy.core.ResourceMethodRegistry.register(ResourceMethodRegistry.java:252)
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:222)
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:194)
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:180)
    at org.jboss.resteasy.core.ResourceMethodRegistry.addResourceFactory(ResourceMethodRegistry.java:157)
    at org.jboss.resteasy.core.ResourceMethodRegistry.addPerRequestResource(ResourceMethodRegistry.java:76)
    at org.jboss.resteasy.spi.ResteasyDeployment.registration(ResteasyDeployment.java:404)
    at org.jboss.resteasy.spi.ResteasyDeployment.start(ResteasyDeployment.java:245)
    at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.init(ServletContainerDispatcher.java:113)
    at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.init(HttpServletDispatcher.java:36)
    at io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:117)
    at org.wildfly.extension.undertow.security.RunAsLifecycleInterceptor.init(RunAsLifecycleInterceptor.java:78)
    at io.undertow.servlet.core.LifecyleInterceptorInvocation.proceed(LifecyleInterceptorInvocation.java:103)
    at io.undertow.servlet.core.ManagedServlet$DefaultInstanceStrategy.start(ManagedServlet.java:231)
    at io.undertow.servlet.core.ManagedServlet.createServlet(ManagedServlet.java:132)
    at io.undertow.servlet.core.DeploymentManagerImpl.start(DeploymentManagerImpl.java:526)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService.startContext(UndertowDeploymentService.java:101)
    at org.wildfly.extension.undertow.deployment.UndertowDeploymentService$1.run(UndertowDeploymentService.java:82)
    ... 6 more

PS：我已经翻译了上面的类名，但是没有在最后一个日志中，我相信没有问题需要理解，请告诉我是否如此。

我得到了以下内容：

Unable to find a constructor that takes a String param or a valueOf() or fromString() method for javax.ws.rs.FormParam("products_from") on private java.util.List ....services.pack.pack.BeanNewPack.productsTo for basetype: ....services.pack.ProducsTo

有没有办法在另一个BeanParam下创建BeanParam列表？

1 个答案:

答案 0 :(得分：1)

您不能将@BeanParam或@FormParam用于JSON。如果您不使用任何注释并遵循正确的JavaBean约定，则不需要执行任何其他操作。它会自动为您转换。

@POST
@Consumes("application/json")
public void create(BeanNewPack newPack) {

并删除所有@FormParam。

如果您的属性不遵循JavaBean约定，或者如果您的JSON中有一些不太符合命名约定的JSON属性名称，那么您可以使用@JsonProperty 

@JsonProperty("id_from")
private Long idFrom;

@JsonProperty("id_store")
private Long idStore = -1L;

@JsonProperty("products_to")
private List<ProductsTo> productsTo;

你需要确保你有杰克逊编译。杰克逊已经包含在Wildfly中，所以你可以添加一个provided依赖

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.8.4</version>
  <scope>provided</scope>
</dependency>

如果您不想添加任何额外的依赖项，那么您需要遵循JavaBean命名约定，例如。

"id_from": 1

// class

public void setId_from() {}

我知道，这很丑陋。但是如果你想在你的JSON中使用下划线，那就是它需要的东西。有一种方法可以让蛇盒自动进行驼峰式转换，但这可能超出了这个问题的范围。只是熟悉使用@JsonProperty。如果您想要了解有关自动转换的更多信息，只需进行搜索或发布其他问题。

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