我想将HashMap对象作为POST变量发送到ReST资源。我使用Form
该类发送对象。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)
我写的客户代码正确吗?还有其他方法可以将HashMap对象作为POST变量发送吗?
只是为了清除一些东西。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。应该这样使用:
@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向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,它将首先将其序列化为XML,然后将其发送到该服务,然后反序列化并用它。不幸的是,Jersey无法自动编组/
unmmarshal,HashMap
因此,如果您仅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。包装器将带有注释@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“启用了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;
}
}
一旦所有这些都就绪(必须由您的服务和客户端使用,因此将其放入一个碎片罐中),就可以像下面这样定义您的服务:
@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;
}
}
你们都准备好了。您的客户应该这样:
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数据传递HashMap<String, String>
给REST服务。您还可以使实现更加通用。希望这可以帮助。
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