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jackson work

This commit is contained in:
eugenp 2013-12-21 16:18:32 +02:00
parent 88fe235abc
commit 6f9026a183
4 changed files with 243 additions and 8 deletions
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42
jackson/src/test/java/org/baeldung/jackson/BarDto.java Normal file
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package org.baeldung.jackson;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@JsonIgnoreProperties(value = { "intValue" })
public class BarDto {
private String stringValue;
private int intValue;
private boolean booleanValue;
public BarDto() {
super();
}
// API
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;
}
}

112
jackson/src/test/java/org/baeldung/jackson/JacksonUnitTest.java
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@ -1,37 +1,133 @@
package org.baeldung.jackson;
import static org.hamcrest.Matchers.containsString;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
import java.io.IOException;
import java.util.List;
import org.junit.Test;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException;
import com.google.common.collect.Lists;
public class JacksonUnitTest {
// tests
// tests - single entity to json
@Test
public final void whenDtoHasOnlyDefaultValues_thenCorrect() throws JsonParseException, IOException {
public final void givenOnlyNonDefaultValuesAreSerialized_whenDtoHasOnlyDefaultValues_thenCorrect() throws JsonParseException, IOException {
final ObjectMapper mapper = new ObjectMapper();
final String fooDtoAsString = mapper.writeValueAsString(new FooDto());
System.out.println(fooDtoAsString);
final String dtoAsString = mapper.writeValueAsString(new FooDto());
assertThat(dtoAsString, not(containsString("intValue")));
System.out.println(dtoAsString);
}
@Test
public final void whenDtoHasNonDefaultValue_thenCorrect() throws JsonParseException, IOException {
public final void givenOnlyNonDefaultValuesAreSerialized_whenDtoHasNonDefaultValue_thenCorrect() throws JsonParseException, IOException {
final ObjectMapper mapper = new ObjectMapper();
final FooDto dtoObject = new FooDto();
dtoObject.setBooleanValue(true);
final String fooDtoAsString = mapper.writeValueAsString(dtoObject);
System.out.println(fooDtoAsString);
final String dtoAsString = mapper.writeValueAsString(dtoObject);
assertThat(dtoAsString, containsString("booleanValue"));
System.out.println(dtoAsString);
}
@Test
public final void givenFieldIsIgnored_whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
final ObjectMapper mapper = new ObjectMapper();
final BarDto dtoObject = new BarDto();
dtoObject.setBooleanValue(true);
final String dtoAsString = mapper.writeValueAsString(dtoObject);
assertThat(dtoAsString, not(containsString("intValue")));
assertThat(dtoAsString, containsString("booleanValue"));
System.out.println(dtoAsString);
}
// tests - multiple entities to json
@Test
public final void whenDtoIsSerialized_thenCorrect() throws JsonParseException, IOException {
final List<MyDto> listOfDtos = Lists.newArrayList(new MyDto("a", 1, true), new MyDto("bc", 3, false));
final ObjectMapper mapper = new ObjectMapper();
final String dtosAsString = mapper.writeValueAsString(listOfDtos);
System.out.println(dtosAsString);
}
// tests - json to single entity
@Test
public final void whenDeserializingAJsonToAClass_thenCorrect() throws JsonParseException, JsonMappingException, IOException {
final String jsonAsString = "{\"stringValue\":\"a\",\"intValue\":1,\"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\"}";
final ObjectMapper mapper = new ObjectMapper();
final MyDto readValue = mapper.readValue(jsonAsString, MyDto.class);
assertNotNull(readValue);
assertThat(readValue.getStringValue(), equalTo("a"));
assertThat(readValue.isBooleanValue(), equalTo(true));
assertThat(readValue.getIntValue(), equalTo(1));
}
@Test
public final void givenJsonHasUnkownValuesButJacksonIsIgnoringUnkownFields_whenDeserializingAJsonToAClass_thenCorrect() throws JsonParseException, JsonMappingException, IOException {
final String jsonAsString = "{\"stringValue\":\"a\",\"intValue\":1,\"booleanValue\":true,\"stringValue2\":\"something\"}";
final ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
final MyDto readValue = mapper.readValue(jsonAsString, MyDto.class);
assertNotNull(readValue);
assertThat(readValue.getStringValue(), equalTo("a"));
assertThat(readValue.isBooleanValue(), equalTo(true));
assertThat(readValue.getIntValue(), equalTo(1));
}
@Test
public final void givenJsonHasUnkownValuesButUnkownFieldsAreIgnoredOnClass_whenDeserializingAJsonToAClass_thenCorrect() throws JsonParseException, JsonMappingException, IOException {
final String jsonAsString = "{\"stringValue\":\"a\",\"intValue\":1,\"booleanValue\":true,\"stringValue2\":\"something\"}";
final ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
final MyDtoIgnoreUnkown readValue = mapper.readValue(jsonAsString, MyDtoIgnoreUnkown.class);
assertNotNull(readValue);
assertThat(readValue.getStringValue(), equalTo("a"));
assertThat(readValue.isBooleanValue(), equalTo(true));
assertThat(readValue.getIntValue(), equalTo(1));
}
// tests - json to multiple entities
}
/*
Article Ideas:
- Deserializing with a custom JsonParser
- Jackson Ignore: ignore specific fields at field level, at class level,
*/

47
jackson/src/test/java/org/baeldung/jackson/MyDto.java Normal file
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package org.baeldung.jackson;
public class MyDto {
private String stringValue;
private int intValue;
private boolean booleanValue;
public MyDto() {
super();
}
public MyDto(final String stringValue, final int intValue, final boolean booleanValue) {
super();
this.stringValue = stringValue;
this.intValue = intValue;
this.booleanValue = booleanValue;
}
// API
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;
}
}

50
jackson/src/test/java/org/baeldung/jackson/MyDtoIgnoreUnkown.java Normal file
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package org.baeldung.jackson;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@JsonIgnoreProperties(ignoreUnknown = true)
public class MyDtoIgnoreUnkown {
private String stringValue;
private int intValue;
private boolean booleanValue;
public MyDtoIgnoreUnkown() {
super();
}
public MyDtoIgnoreUnkown(final String stringValue, final int intValue, final boolean booleanValue) {
super();
this.stringValue = stringValue;
this.intValue = intValue;
this.booleanValue = booleanValue;
}
// API
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;
}
}