Json object from database in java

Question

Can anyone help me how to create a JSON Object from the database?

This is what the JSON output should look like:

{“devicelist”:{
    “de         


        

Answer 1

If you have a Device objects, json-lib can serialize the object using get() methods as JSON.

import java.util.*;
import net.sf.json.*;

public class JsonEncode {
    public static void main(String[] args) throws Exception {
        Device d1 = new Device("01", "CAM", "LivingRoom");
        Device d2 = new Device("15", "CAM", "Kitchen");

        List devices = new ArrayList(Arrays.asList(d1, d2));

        JSONArray serializedDevices = JSONArray.fromObject(devices);
        JSONObject jsonDevices = new JSONObject();
        jsonDevices.put("devices", serializedDevices);

        JSONObject json = new JSONObject();
        json.put("deviceList", jsonDevices);
        System.out.println(json);
    }

    public static class Device {
        Device(String id, String type, String name) {
            this.id = id;
            this.type = type;
            this.name = name;
        }
        private String id;
        public String getId() { return id; }
        private String type;
        public String getType() { return type; }
        private String name;
        public String getName() { return name; }
    }
}

Saved as: JsonEncode.java

Compiled with:

javac -cp json-lib-2.4-jdk15.jar JsonEncode.java

Executed with (Note: classpath has DOS separator):

java -cp .;json-lib-2.4-jdk15.jar;commons-lang-2.6.jar;commons-logging-1.1.1.jar;commons-collections-3.2.1.jar;ezmorph-1.0.6.jar;commons-beanutils-1.8.0.jar JsonEncode

Dependencies:

• json-lib-2.4-jdk15.jar
• commons-lang-2.6.jar
• commons-logging-1.1.1.jar
• commons-collections-3.2.1.jar
• commons-beanutils-1.8.0.jar
• ezmorph-1.0.6.jar