将List / Map作为POST参数泽西发送
我想将HashMap对象作为POST变量发送到ReST资源。 我使用Form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 hashmap = new HashMap(); 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 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 newProj(@FormParam("data1") HashMap postVarMap, @Context HttpServletResponse response) { System.out.println(postVarMap); MultivaluedMap 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exception
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)
我写的客户端代码是否正确？ 有没有其他方法将HashMap对象作为POST变量发送？
只是为了清楚一点。 MultivaluedMap旨在用于获取表单参数的一般映射，例如通过POST HTTP请求提交给您的服务的参数。 它应该像这样使用：
@POST @Consumes("application/x-www-form-urlencoded") public void post(MultivaluedMap formParams) { // Store the message }
但是，当您的客户端应用程序需要为您的REST服务提供某种数据时（在您的情况下， HashMap包含我想了很多重要信息），它会首先将其序列化为XML，然后将其发送到服务，然后反序列化并使用它。 不幸的是，Jersey无法自动编组/解组HashMap所以如果你刚刚在newProj方法中提供了HashMap参数，你就会得到一个例外。
那么如何将HashMap发送到您的服务？ 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。 包装器将使用@XmlRootElement进行注释
@XmlRootElement public class MyHashMapObject { private Map mapProperty; public MyHashMapObject() { mapProperty = new HashMap(); } @XmlJavaTypeAdapter(MapAdapter.class) // NOTE: Our custom XmlAdaper public Map getMapProperty() { return mapProperty; } public void setMapProperty(Map map) { this.mapProperty = map; } }
然后，您需要定义“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> { public MapElement[] marshal(Map arg0) throws Exception { MapElement[] mapElements = new MapElement[arg0.size()]; int i = 0; for (Map.Entry entry : arg0.entrySet()) mapElements[i++] = new MapElement(entry.getKey(), entry.getValue()); return mapElements; } public Map unmarshal(MapElement[] arg0) throws Exception { Map r = new HashMap(); for (MapElement mapelement : arg0) r.put(mapelement.key, mapelement.value); return r; } }
一旦你完成了所有这些（它必须由你的服务和客户端使用，所以把它放到一些shard jar），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 post( MyHashMapObject anotherMap) { anotherMap.getMapProperty().put("e", "10"); anotherMap.getMapProperty().put("f", "11"); anotherMap.getMapProperty().put("g", "12"); return anotherMap; } }
你们现在都准备好了。 你的客户应该这样：
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 map = new MyHashMapObject(); 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 myMap = response.getEntity(MyHashMapObject.class).getMapProperty(); for(Map.Entry 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HashMap传递给REST服务。 您还可以使实现更通用。 希望这可以帮助。
将Map作为POST请求体发送
@POST @Produces("application/json") @Consumes("application/json") @Path("/sendUser") public Response sendUser(Map usersMap) { String name = usersMap.get("Name"); // first check for existing key String family = usersMap.get("Family"); String phone = usersMap.get("Phone"); String mobile = usersMap.get("Mobile"); return Response.ok("Get user attributes successfully !").build(); }
从POST获取地图响应
@POST @Produces("application/json") @Consumes("application/json") @Path("/getUser") public Response getUser(String searchInputJsonString) { Map usersMap = new HashMap<>(); usersMap.put("Name","Johm"); usersMap.put("Family","WRKlein"); usersMap.put("Phone","87540255"); usersMap.put("Mobile", "112458033"); return Response.ok(usersMap).build(); }
您可以在javascript中使用JSON.stringify（myMap），从而将stringyfied映射作为表单参数传递。
在java中，您将字符串解析回地图，如下所示：
@Path("doStuff") @POST @Produces(MediaType.APPLICATION_JSON) public void doStuff(@FormParam("mapAsJson") String mapAsJson) throws JsonParseException, JsonMappingException, IOException { @SuppressWarnings("unchecked") HashMap mapFromJson = (HashMap)new ObjectMapper().readValue(mapAsJson, HashMap.class); //add your processing }