Jackson Map Serialize/Deserialize (#1511)

* Solr w Apache SolrJ

* Solr w Apache SolrJ

* updated test names and moved add to @before method

* create apache-solrj module, moved code from spring-data-solr

* More examples for indexing,delete,and query for solrj

* More examples for indexing,delete,and query for solrj

* Jackson Map Serialize/Deserialize

* Jackson Map Serialize/Deserialize

jackson/src/main/java/com/baeldung/jackson/entities/MyPair.java

@@ -0,0 +1,80 @@
+package com.baeldung.jackson.entities;
+
+import com.fasterxml.jackson.annotation.JsonValue;
+
+public class MyPair {
+
+	private String first;
+	private String second;
+
+	public MyPair(String first, String second) {
+		this.first = first;
+		this.second = second;
+	}
+
+	public MyPair(String both) {
+		String[] pairs = both.split("and");
+		this.first = pairs[0].trim();
+		this.second = pairs[1].trim();
+	}
+
+	@Override
+	@JsonValue
+	public String toString() {
+		return first + " and " + second;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((first == null) ? 0 : first.hashCode());
+		result = prime * result + ((second == null) ? 0 : second.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null) {
+			return false;
+		}
+		if (!(obj instanceof MyPair)) {
+			return false;
+		}
+		MyPair other = (MyPair) obj;
+		if (first == null) {
+			if (other.first != null) {
+				return false;
+			}
+		} else if (!first.equals(other.first)) {
+			return false;
+		}
+		if (second == null) {
+			if (other.second != null) {
+				return false;
+			}
+		} else if (!second.equals(other.second)) {
+			return false;
+		}
+		return true;
+	}
+
+	public String getFirst() {
+		return first;
+	}
+
+	public void setFirst(String first) {
+		this.first = first;
+	}
+
+	public String getSecond() {
+		return second;
+	}
+
+	public void setSecond(String second) {
+		this.second = second;
+	}
+}

jackson/src/main/java/com/baeldung/jackson/serialization/MyPairSerializer.java

@@ -0,0 +1,25 @@
+package com.baeldung.jackson.serialization;
+
+import java.io.IOException;
+import java.io.StringWriter;
+
+import com.baeldung.jackson.entities.MyPair;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+public class MyPairSerializer extends JsonSerializer<MyPair> {
+
+	private final ObjectMapper mapper = new ObjectMapper();
+
+	@Override
+	public void serialize(MyPair value, JsonGenerator gen,
+			SerializerProvider serializers) throws IOException,
+			JsonProcessingException {
+		StringWriter writer = new StringWriter();
+		mapper.writeValue(writer, value);
+		gen.writeFieldName(writer.toString());
+	}
+}