我想将 HashMap 对象作为 POST 变量发送到 ReST 资源。我用这个Form
类来发送对象。客户端代码:
public static void main(String[] args)
{
ClientConfig config = new DefaultClientConfig();
Client client = Client.create(config);
WebResource service = client.resource(getBaseURI());
HashMap<String, String> hashmap = new HashMap<String, String>();
hashmap.put("Key1", "value1");
hashmap.put("Key2", "value2");
Form form = new Form();
form.add("data1", hashmap);
ClientResponse response = service.path("hello2").path("hello2").type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class, form);
@SuppressWarnings("unchecked")
MultivaluedMap<String, String> map = response.getEntity(MultivaluedMap.class);
System.out.println(map.get("response").get(0));
System.out.println(map.get("response2"));
}
REST 资源如下:
@Path("/hello2")
public class FormResource
{
@Context
UriInfo uriInfo;
@Context
Request request;
public FormResource()
{
}
public FormResource(UriInfo uriInfo, Request request)// , String data1)
{
this.uriInfo = uriInfo;
this.request = request;
}
@POST
@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
public MultivaluedMap<String, String> newProj(@FormParam("data1") HashMap<String, String> postVarMap, @Context HttpServletResponse response)
{
System.out.println(postVarMap);
MultivaluedMap<String, String> hash = new MultivaluedMapImpl();
hash.add("response", "response1");
hash.add("response", "response2");
hash.add("response2", "fbshabfsdb");
URI uri = uriInfo.getAbsolutePathBuilder().build();
Response.created(uri).build();
return hash;
}
}
我在 Tomcat 6.0 日志中收到以下异常
Dec 7, 2011 3:38:39 PM org.apache.catalina.core.StandardContext reload
INFO: Reloading Context with name [/JerCDemo] has started
Dec 7, 2011 3:38:40 PM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
com.reflexis.nbe.jersey
Dec 7, 2011 3:38:40 PM com.sun.jersey.api.core.ScanningResourceConfig logClasses
INFO: Root resource classes found:
class com.reflexis.nbe.jersey.FormResource
Dec 7, 2011 3:38:40 PM com.sun.jersey.api.core.ScanningResourceConfig init
INFO: No provider classes found.
Dec 7, 2011 3:38:40 PM com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.9.1 09/14/2011 02:05 PM'
Dec 7, 2011 3:38:40 PM com.sun.jersey.spi.inject.Errors processErrorMessages
SEVERE: The following errors and warnings have been detected with resource and/or provider classes:
SEVERE: Missing dependency for method public javax.ws.rs.core.MultivaluedMap com.reflexis.nbe.jersey.FormResource.newProj(java.util.HashMap,javax.servlet.http.HttpServletResponse) at parameter at index 0
SEVERE: Missing dependency for method public javax.ws.rs.core.MultivaluedMap com.reflexis.nbe.jersey.FormResource.newProj(java.util.HashMap,javax.servlet.http.HttpServletResponse) at parameter at index 0
SEVERE: Method, public javax.ws.rs.core.MultivaluedMap com.reflexis.nbe.jersey.FormResource.newProj(java.util.HashMap,javax.servlet.http.HttpServletResponse), annotated with POST of resource, class com.reflexis.nbe.jersey.FormResource, is not recognized as valid resource method.
Dec 7, 2011 3:38:40 PM org.apache.catalina.core.ApplicationContext log
SEVERE: StandardWrapper.Throwable
com.sun.jersey.spi.inject.Errors$ErrorMessagesException
at com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
at com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3460)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1357)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1649)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1638)
at java.lang.Thread.run(Thread.java:619)
Dec 7, 2011 3:38:40 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /JerCDemo threw load() exception
com.sun.jersey.spi.inject.Errors$ErrorMessagesException
at com.sun.jersey.spi.inject.Errors.processErrorMessages(Errors.java:170)
at com.sun.jersey.spi.inject.Errors.postProcess(Errors.java:136)
at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:199)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3460)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:426)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1357)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1649)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1658)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1638)
at java.lang.Thread.run(Thread.java:619)
我写的客户端代码正确吗?有没有其他方法可以将 HashMap 对象作为 POST 变量发送?
只是为了澄清一点。本
MultivaluedMap<String, String>
是为了用于获得通过的HTTP POST请求提交到您的服务形式参数如参数一般地图。它应该像这样使用:@POST @Consumes("application/x-www-form-urlencoded") public void post(MultivaluedMap<String, String> formParams) { // Store the message }
但是,当您的客户端应用程序需要为您的 REST 服务提供某种数据(在您的情况下
HashMap
,我想包含很多重要信息)时,它会首先将其序列化为 XML,然后将其发送到服务,然后该服务将反序列化并用它。不幸的是, Jersey 无法自动编组/取消编组HashMap
s,因此如果您只是HashMap
在newProj
方法中提供了参数,则会出现异常。那么如何将 HashMap 发送到您的服务呢?好吧,关键是 JAXB
@XmlRootElement
和自定义XmlAdapter
:-)首先,您需要为地图编写自己的包装器。包装器将被注释为
@XmlRootElement
@XmlRootElement public class MyHashMapObject<T, U> { private Map<T, U> mapProperty; public MyHashMapObject() { mapProperty = new HashMap<T, U>(); } @XmlJavaTypeAdapter(MapAdapter.class) // NOTE: Our custom XmlAdaper public Map<T, U> getMapProperty() { return mapProperty; } public void setMapProperty(Map<T, U> map) { this.mapProperty = map; } }
然后您需要定义您的“启用 JAXB”的地图元素:
public class MapElement { @XmlElement public String key; @XmlElement public String value; private MapElement() { } public MapElement(String key, String value) { this.key = key; this.value = value; } }
最后定义您的自定义 XmlAdapter:
public class MapAdapter extends XmlAdapter<MapElement[], Map<String, String>> { public MapElement[] marshal(Map<String, String> arg0) throws Exception { MapElement[] mapElements = new MapElement[arg0.size()]; int i = 0; for (Map.Entry<String, String> entry : arg0.entrySet()) mapElements[i++] = new MapElement(entry.getKey(), entry.getValue()); return mapElements; } public Map<String, String> unmarshal(MapElement[] arg0) throws Exception { Map<String, String> r = new HashMap<String, String>(); for (MapElement mapelement : arg0) r.put(mapelement.key, mapelement.value); return r; } }
一旦你准备好了所有这些(它必须被你的服务和客户端使用,所以把它放在一些碎片罐子里),你可以像这样定义你的服务:
@Path("/hello") public class FormResource { //@GET @POST @Produces(MediaType.APPLICATION_XML) @Consumes(MediaType.APPLICATION_XML) public MyHashMapObject<String, String> post( MyHashMapObject<String, String> anotherMap) { anotherMap.getMapProperty().put("e", "10"); anotherMap.getMapProperty().put("f", "11"); anotherMap.getMapProperty().put("g", "12"); return anotherMap; } }
你现在就可以走了。你的客户应该是这样的:
public class Test { public static void main(String[] args) { ClientConfig config = new DefaultClientConfig(); Client client = Client.create(config); WebResource service = client.resource(getBaseURI()); // Now do the MAP stuff MyHashMapObject<String, String> map = new MyHashMapObject<String, String>(); map.getMapProperty().put("a", "1"); map.getMapProperty().put("b", "2"); ClientResponse response = service.path("rest").path("hello2") .type(MediaType.APPLICATION_XML) .accept(MediaType.APPLICATION_XML) .post(ClientResponse.class, map); Map<String, String> myMap = response.getEntity(MyHashMapObject.class).getMapProperty(); for(Map.Entry<String, String> entry : myMap.entrySet()) System.out.format("Key: %s, Value: %s\n", entry.getKey(), entry.getValue()); } private static URI getBaseURI() { return UriBuilder.fromUri( "http://localhost:8080/org.nowaq.jersey.first").build(); } }
现在您可以轻松地将您的信息传递
HashMap<String, String>
给您的 REST 服务。您还可以使实现更通用一些。希望这可以帮助。