Below code uses Jackson Json API to convert a HashMap into a JSON String
Result: {"3":"Angelina","2":"Brad Pitt","1":"Jason Stathom"}
We will have to add following dependency:
package com.blogspot.javasampleprogram;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;
/**
* @author http://java-sample-program.blogspot.in/
* HashMap to Json String generator
*/
public class JsonStringGenerator {
/**
* Method to convert map into json format
* @param map with data to be converted into json
* @return json string
*/
public static String createJsonString(HashMap jsonMap) throws IOException {
System.out.println("Map:"+jsonMap);
Writer writer = new StringWriter();
JsonGenerator jsonGenerator = new JsonFactory().
createJsonGenerator(writer);
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue(jsonGenerator, jsonMap);
jsonGenerator.close();
System.out.println(writer.toString());
return writer.toString();
}
public static void main(String[] args) throws IOException {
HashMap<String, String> map = new HashMap<String, String>();
map.put("1", "Jason Stathom");
map.put("2", "Brad Pitt");
map.put("3", "Angelina");
createJsonString(map);
}
}
Result: {"3":"Angelina","2":"Brad Pitt","1":"Jason Stathom"}
We will have to add following dependency:
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>com.springsource.org.codehaus.jackson.mapper</artifactId>
<version>1.4.3</version>
</dependency>
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