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  • How to convert Model Object into JSON string and JSON string into Model Object in Java?

    @babita.dhami
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    Sometimes we need to get JSON string direct from Model object and to read JSON values from Model object. We can do this functionality very easily by using Jackson Mapper.

    Follow to steps in order to do conversion from Model Object to JSON string and from JSON string to Model object.

    1. You need to declare the below dependency for Jackson JSON Mapper in your pom.xml file:
    1. <dependency>
    2.     <groupId>org.codehaus.jackson</groupId>
    3.     <artifactId>jackson-mapper-asl</artifactId>
    4.     <version>1.9.11</version>
    5. </dependency>
    6. <dependency>
    7.     <groupId>org.codehaus.jackson</groupId>
    8.     <artifactId>jackson-core-asl</artifactId>
    9.     <version>1.9.11</version>
    10. </dependency>
    11. <dependency>
    12.     <groupId>org.codehaus.jackson</groupId>
    13.     <artifactId>jackson-jaxrs</artifactId>
    14.     <version>1.9.11</version>
    15. </dependency>
    16. <dependency>
    17.     <groupId>org.codehaus.jackson</groupId>
    18.     <artifactId>jackson-xc</artifactId>
    19.     <version>1.9.11</version>
    20. </dependency>
    1. Now define the model class as below:

    SubjectListModel.java

    1. @JsonIgnoreProperties(ignoreUnknown = true)
    2. @JsonSerialize(include = JsonSerialize.Inclusion.NON_DEFAULT)
    3. public class SubjectListModel {
    4.  
    5.     private List<String> subjectList;
    6.  
    7.     public List<String> getSubjectList() {
    8.         return subjectList;
    9.     }
    10.  
    11.     public void setSubjectList(List<String> subjectList) {
    12.         this.subjectList = subjectList;
    13.     }
    14.  
    15. }
    1. Write the below function to JSON string from Model Object
    1. /**
    2.  * Get JSON string from an object
    3.  * @param object
    4.  * @return
    5.  */
    6. public static String getJsonFromObject(Object object)
    7. {
    8.  
    9.     ObjectMapper mapper = new ObjectMapper();
    10.     String jsonString = null;
    11.  
    12.     try
    13.     {
    14.         if (object != null)
    15.             jsonString = mapper.defaultPrettyPrintingWriter().writeValueAsString(object);
    16.     }
    17.     catch (JsonGenerationException e)
    18.     {
    19.         // TODO Auto-generated catch block
    20.         e.printStackTrace();
    21.     }
    22.     catch (JsonMappingException e)
    23.     {
    24.         // TODO Auto-generated catch block
    25.         e.printStackTrace();
    26.     }
    27.     catch (IOException e)
    28.     {
    29.         // TODO Auto-generated catch block
    30.         e.printStackTrace();
    31.     }
    32.     // jsonString = URLEncoder.encode(jsonString, "UTF-8");
    33.     return jsonString;
    34.  
    35. }

    Now we'll use the above function as below:

    1. SubjectListModel subjectListModel = new SubjectListModel();
    2. List<String> subjectList = new ArrayList<String>();
    3. subjectList.add("Graffiti");
    4. subjectList.add("Pothole");
    5. subjectList.add("Street Light Defect");
    6. subjectListModel.setSubjectList(subjectList);
    7.  
    8. //Call the above function
    9. String jsonString = getJsonFromObject(subjectListModel);
    10. System.out.println(jsonString);

    Output:

    1. {"subjectList" : [ "Graffiti", "Pothole", "Street Light Defect" ]}
    1. Write the below code to get SubjectListModel model object from JSON string:
    1.    /**
    2.      * Get Model Object from JSON string
    3.      * @param JsonString
    4.      * @return
    5.      */
    6.     public static Object getObjectFromJson(String JsonString)
    7.     {
    8.         UpdatedTickitHistoryModel updatedTickitHistoryModel = null;
    9.         try
    10.         {
    11.             if (JsonString != null && !JsonString.isEmpty())
    12.                 updatedTickitHistoryModel = new ObjectMapper().readValue(JsonString, UpdatedTickitHistoryModel.class);
    13.         }
    14.         catch (JsonParseException e)
    15.         {
    16.             // TODO Auto-generated catch block
    17.             e.printStackTrace();
    18.         }
    19.         catch (JsonMappingException e)
    20.         {
    21.             // TODO Auto-generated catch block
    22.             e.printStackTrace();
    23.         }
    24.         catch (IOException e)
    25.         {
    26.             // TODO Auto-generated catch block
    27.             e.printStackTrace();
    28.         }
    29.  
    30.         return updatedTickitHistoryModel;
    31.     }

    now we'll get SubjectListModel object from jsonstring here by usinf above function:

    1. String jsonString = {"subjectList" : [ "Graffiti", "Pothole", "Street Light Defect" ]};
    2. SubjectListModel subjectListModel = (SubjectListModel) getObjectFromJsonForSubjectList(jsonString);

    Hope this will help you :)

    Java jackson-mapper convert json string to model object convert model object to json string json
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