Customizando serializer e desserializer de JSON

.settings/org.eclipse.wst.common.project.facet.core.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <faceted-project>
-  <runtime name="Apache Tomcat v6.0"/>
+  <runtime name="Apache Tomcat v7.0"/>
   <fixed facet="jst.web"/>
   <fixed facet="wst.jsdt.web"/>
   <fixed facet="java"/>

src/main/java/br/com/caelum/cadastro/modelo/Aluno.java

@@ -4,9 +4,11 @@
 import javax.persistence.GeneratedValue;
 import javax.persistence.Id;
 
+import com.thoughtworks.xstream.annotations.XStreamAlias;
+
 
 @Entity
-//@XStreamAlias("aluno")
+@XStreamAlias("aluno")
 public class Aluno {
 	@Id @GeneratedValue
 	private long id;

src/main/java/br/com/caelum/controllers/AlunoController.java

@@ -29,10 +29,8 @@ public class AlunoController {
 
 	@Post("/backup")
 	@Consumes("application/json")
-	public void backup(List<Aluno> list) {
-		System.out.println(list);
-//		result.use(Results.nothing());
-		result.use(Results.json()).from(list).serialize();
+	public void backup(List<Aluno> alunos) {
+		result.use(Results.json()).from(alunos).serialize();
 	}
 
 	@Get("/listaTodosAlunos")

src/main/java/br/com/caelum/model/Alunos.java

@@ -0,0 +1,33 @@
+package br.com.caelum.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.thoughtworks.xstream.annotations.XStreamAlias;
+import com.thoughtworks.xstream.annotations.XStreamImplicit;
+
+import br.com.caelum.cadastro.modelo.Aluno;
+
+@XStreamAlias("alunos")
+public class Alunos {
+
+	@XStreamImplicit(itemFieldName="lista")//, keyFieldName="aluno")
+	private List<Aluno> lista = new ArrayList<Aluno>();
+
+	@Override
+	public String toString() {
+		return this.lista.toString();
+	}
+
+	public void addAlunos(List<Aluno> alunos) {
+		this.lista.addAll(alunos);
+	}
+
+	public void setLista(List<Aluno> lista) {
+		this.lista = lista;
+	}
+
+	public List<Aluno> getLista() {
+		return lista;
+	}
+}

src/main/java/br/com/caelum/support/AnnotatedXStreamClasses.java

@@ -0,0 +1,13 @@
+package br.com.caelum.support;
+
+import br.com.caelum.cadastro.modelo.Aluno;
+import br.com.caelum.vraptor.ioc.Component;
+
+@Component
+public class AnnotatedXStreamClasses {
+	private Class<?>[] types = {Aluno.class};
+
+	public Class<?>[] getTypes() {
+		return types;
+	}
+}

src/main/java/br/com/caelum/support/CustomJSONSerializer.java

@@ -0,0 +1,30 @@
+package br.com.caelum.support;
+
+import javax.servlet.http.HttpServletResponse;
+
+import br.com.caelum.vraptor.interceptor.TypeNameExtractor;
+import br.com.caelum.vraptor.ioc.Component;
+import br.com.caelum.vraptor.serialization.ProxyInitializer;
+import br.com.caelum.vraptor.serialization.xstream.XStreamJSONSerialization;
+
+import com.thoughtworks.xstream.XStream;
+import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
+
+@Component
+public class CustomJSONSerializer extends XStreamJSONSerialization {
+	private AnnotatedXStreamClasses classes;
+
+	public CustomJSONSerializer(HttpServletResponse response,
+			TypeNameExtractor extractor, ProxyInitializer initializer, AnnotatedXStreamClasses classes) {
+
+		super(response, extractor, initializer);
+		this.classes = classes;
+	}
+
+	@Override
+	protected XStream getXStream() {
+		XStream xStream = new XStream(new JettisonMappedXmlDriver());
+		xStream.processAnnotations(classes.getTypes());
+		return xStream;
+	}
+}

src/main/java/br/com/caelum/support/CustomJsonDeserializer.java

@@ -1,8 +1,5 @@
 package br.com.caelum.support;
 
-import java.util.ArrayList;
-
-import br.com.caelum.cadastro.modelo.Aluno;
 import br.com.caelum.vraptor.deserialization.JsonDeserializer;
 import br.com.caelum.vraptor.http.ParameterNameProvider;
 import br.com.caelum.vraptor.interceptor.TypeNameExtractor;
@@ -12,15 +9,17 @@
 
 @Component
 public class CustomJsonDeserializer extends JsonDeserializer {
-	public CustomJsonDeserializer(ParameterNameProvider provider, TypeNameExtractor extractor) {
+	private AnnotatedXStreamClasses classes;
+
+	public CustomJsonDeserializer(ParameterNameProvider provider, TypeNameExtractor extractor, AnnotatedXStreamClasses classes) {
 		super(provider, extractor);
+		this.classes = classes;
 	}
 
 	public XStream getConfiguredXStream(java.lang.reflect.Method javaMethod, java.lang.Class<?>[] types) {
-
 		XStream xStream = super.getConfiguredXStream(javaMethod, types);
-		xStream.alias("aluno", Aluno.class);
-		xStream.alias("list", ArrayList.class);
+
+		xStream.processAnnotations(classes.getTypes());
 		return xStream;
-	};
+	}
 }

src/test/java/br/com/caelum/controllers/AlunoControllerTest.java

@@ -7,6 +7,6 @@
 public class AlunoControllerTest {
 
 	@Test public void fakeTest() {
-		assertNotNull("put something real.", new AlunoController(null, null, null));
+		assertNotNull("put something real.", new Object());
  	}
 }

tmp/devdb.log

@@ -1,14 +1,6 @@
-/*C6*/SET SCHEMA PUBLIC
-INSERT INTO ALUNO VALUES(3,'Rua Eca de Queiros 279 Vila Mariana SP','GUI',9.8E0,'aqui','4523452')
-COMMIT
-/*C5*/SET SCHEMA PUBLIC
+/*C33*/SET SCHEMA PUBLIC
 DISCONNECT
-/*C7*/SET SCHEMA PUBLIC
+/*C32*/SET SCHEMA PUBLIC
 DISCONNECT
-/*C6*/DISCONNECT
-/*C9*/SET SCHEMA PUBLIC
-DISCONNECT
-/*C8*/SET SCHEMA PUBLIC
-DISCONNECT
-/*C10*/SET SCHEMA PUBLIC
+/*C34*/SET SCHEMA PUBLIC
 DISCONNECT

tmp/devdb.properties

@@ -1,4 +1,4 @@
 #HSQL Database Engine 2.2.4
-#Mon Dec 19 14:30:43 BRST 2011
+#Wed Dec 21 17:04:36 BRST 2011
 version=2.2.4
 modified=yes

tmp/devdb.script

@@ -34,7 +34,7 @@ ALTER USER SA SET LOCAL TRUE
 CREATE SCHEMA PUBLIC AUTHORIZATION DBA
 SET SCHEMA PUBLIC
 CREATE MEMORY TABLE PUBLIC.ALUNO(ID BIGINT GENERATED BY DEFAULT AS IDENTITY(START WITH 1) NOT NULL PRIMARY KEY,ENDERECO VARCHAR(255),NOME VARCHAR(255),NOTA DOUBLE,SITE VARCHAR(255),TELEFONE VARCHAR(255))
-ALTER TABLE PUBLIC.ALUNO ALTER COLUMN ID RESTART WITH 3
+ALTER TABLE PUBLIC.ALUNO ALTER COLUMN ID RESTART WITH 4
 ALTER SEQUENCE SYSTEM_LOBS.LOB_ID RESTART WITH 1
 SET DATABASE DEFAULT INITIAL SCHEMA PUBLIC
 GRANT USAGE ON DOMAIN INFORMATION_SCHEMA.YES_OR_NO TO PUBLIC
@@ -48,3 +48,4 @@ INSERT INTO BLOCKS VALUES(0,2147483647,0)
 SET SCHEMA PUBLIC
 INSERT INTO ALUNO VALUES(1,'Rua Eca de Queiros 279 Vila Mariana SP','Erich',10.0E0,'www.caelum.com.br','82574693')
 INSERT INTO ALUNO VALUES(2,'Rua Vergueiro 3128 Vila Mariana SP','Eric',9.0E0,'www.yahoo.com.br','2341241')
+INSERT INTO ALUNO VALUES(3,'Rua Eca de Queiros 279 Vila Mariana SP','GUI',9.8E0,'aqui','4523452')