jackson work

jackson/src/test/java/org/baeldung/jackson/ignore/MyDtoFieldNameChanged.java

@@ -0,0 +1,50 @@
+package org.baeldung.jackson.ignore;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class MyDtoFieldNameChanged {
+
+    private String stringValue;
+    private int intValue;
+    private boolean booleanValue;
+
+    public MyDtoFieldNameChanged() {
+        super();
+    }
+
+    public MyDtoFieldNameChanged(final String stringValue, final int intValue, final boolean booleanValue) {
+        super();
+
+        this.stringValue = stringValue;
+        this.intValue = intValue;
+        this.booleanValue = booleanValue;
+    }
+
+    // API
+
+    @JsonProperty("strVal")
+    public String getStringValue() {
+        return stringValue;
+    }
+
+    public void setStringValue(final String stringValue) {
+        this.stringValue = stringValue;
+    }
+
+    public int getIntValue() {
+        return intValue;
+    }
+
+    public void setIntValue(final int intValue) {
+        this.intValue = intValue;
+    }
+
+    public boolean isBooleanValue() {
+        return booleanValue;
+    }
+
+    public void setBooleanValue(final boolean booleanValue) {
+        this.booleanValue = booleanValue;
+    }
+
+}

jackson/src/test/java/org/baeldung/jackson/test/JacksonDeserializationUnitTest.java

@@ -36,6 +36,17 @@ public class JacksonDeserializationUnitTest {
         assertThat(readValue.getStringValue(), equalTo("a"));
     }
 
+    @Test
+    public final void givenNotAllFieldsHaveValuesInJson_whenDeserializingAJsonToAClass_thenCorrect() throws JsonParseException, JsonMappingException, IOException {
+        final String jsonAsString = "{\"stringValue\":\"a\",\"booleanValue\":true}";
+        final ObjectMapper mapper = new ObjectMapper();
+
+        final MyDto readValue = mapper.readValue(jsonAsString, MyDto.class);
+
+        assertNotNull(readValue);
+        assertThat(readValue.getStringValue(), equalTo("a"));
+    }
+
     @Test(expected = UnrecognizedPropertyException.class)
     public final void givenJsonHasUnkownValues_whenDeserializingAJsonToAClass_thenExceptionIsThrown() throws JsonParseException, JsonMappingException, IOException {
         final String jsonAsString = "{\"stringValue\":\"a\",\"intValue\":1,\"booleanValue\":true,\"stringValue2\":\"something\"}";
@@ -85,4 +96,3 @@ public class JacksonDeserializationUnitTest {
     }
 
 }
-

jackson/src/test/java/org/baeldung/jackson/test/JacksonSerializationUnitTest.java

@@ -8,6 +8,7 @@ import java.io.IOException;
 import java.util.List;
 
 import org.baeldung.jackson.ignore.MyDto;
+import org.baeldung.jackson.ignore.MyDtoFieldNameChanged;
 import org.baeldung.jackson.ignore.MyDtoIgnoreField;
 import org.baeldung.jackson.ignore.MyDtoIgnoreFieldByName;
 import org.baeldung.jackson.ignore.MyDtoIncludeNonDefault;
@@ -32,7 +33,7 @@ public class JacksonSerializationUnitTest {
     // tests - single entity to json
 
     @Test
-    public final void givenOnlyNonDefaultValuesAreSerialized_whenDtoHasOnlyDefaultValues_thenCorrect() throws JsonParseException, IOException {
+    public final void givenOnlyNonDefaultValuesAreSerializedAndDtoHasOnlyDefaultValues_whenSerializing_thenCorrect() throws JsonParseException, IOException {
         final ObjectMapper mapper = new ObjectMapper();
         final String dtoAsString = mapper.writeValueAsString(new MyDtoIncludeNonDefault());
 
@@ -41,7 +42,7 @@ public class JacksonSerializationUnitTest {
     }
 
     @Test
-    public final void givenOnlyNonDefaultValuesAreSerialized_whenDtoHasNonDefaultValue_thenCorrect() throws JsonParseException, IOException {
+    public final void givenOnlyNonDefaultValuesAreSerializedAndDtoHasNonDefaultValue_whenSerializing_thenCorrect() throws JsonParseException, IOException {
         final ObjectMapper mapper = new ObjectMapper();
         final MyDtoIncludeNonDefault dtoObject = new MyDtoIncludeNonDefault();
         dtoObject.setBooleanValue(true);
@@ -52,6 +53,21 @@ public class JacksonSerializationUnitTest {
         System.out.println(dtoAsString);
     }
 
+    @Test
+    public final void givenNameOfFieldIsChanged_whenSerializing_thenCorrect() throws JsonParseException, IOException {
+        final ObjectMapper mapper = new ObjectMapper();
+        final MyDtoFieldNameChanged dtoObject = new MyDtoFieldNameChanged();
+        dtoObject.setStringValue("a");
+
+        final String dtoAsString = mapper.writeValueAsString(dtoObject);
+
+        assertThat(dtoAsString, not(containsString("stringValue")));
+        assertThat(dtoAsString, containsString("strVal"));
+        System.out.println(dtoAsString);
+    }
+
+    // ignore
+
     @Test
     public final void givenFieldIsIgnoredByName_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
         final ObjectMapper mapper = new ObjectMapper();
@@ -110,17 +126,18 @@ public class JacksonSerializationUnitTest {
     }
 
     @Test
-    public final void givenTypeHasFilterThatIgnoresIntsOver10_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
+    public final void givenTypeHasFilterThatIgnoresNegativeInt_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
         final PropertyFilter theFilter = new SimpleBeanPropertyFilter() {
             @Override
             public final void serializeAsField(final Object pojo, final JsonGenerator jgen, final SerializerProvider provider, final PropertyWriter writer) throws Exception {
                 if (include(writer)) {
-                    if (writer.getName().equals("intValue")) {
+                    if (!writer.getName().equals("intValue")) {
-                        final int intValue = ((MyDtoWithFilter) pojo).getIntValue();
+                        writer.serializeAsField(pojo, jgen, provider);
-                        if (intValue < 10) {
+                        return;
-                            writer.serializeAsField(pojo, jgen, provider);
+                    }
-                        }
+
-                    } else {
+                    final int intValue = ((MyDtoWithFilter) pojo).getIntValue();
+                    if (intValue >= 0) {
                         writer.serializeAsField(pojo, jgen, provider);
                     }
                 } else if (!jgen.canOmitFields()) { // since 2.3
@@ -141,7 +158,7 @@ public class JacksonSerializationUnitTest {
         final FilterProvider filters = new SimpleFilterProvider().addFilter("myFilter", theFilter);
 
         final MyDtoWithFilter dtoObject = new MyDtoWithFilter();
-        dtoObject.setIntValue(12);
+        dtoObject.setIntValue(-1);
 
         final ObjectMapper mapper = new ObjectMapper();
         final String dtoAsString = mapper.writer(filters).writeValueAsString(dtoObject);