Sometimes in AEM there can be scenerio where you have to read from 3rd api/url and that data can be used as a dropdown or may be used in your front end sites .
we have to cretae three classes mentioned below .last two classes is just for deserialization of Json.
- Apireading.java
- UniverseBean.java
- Results.java
I have used this “https://swapi.co/api/planets/ url ,which is in json format here I am fetching the data from that url and then converting this json into java object .
code goes like that:
Apireading.java
package amitsample.core.models;
import com.google.gson.Gson;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.models.annotations.Model;
import javax.annotation.PostConstruct;
import javax.net.ssl.HttpsURLConnection;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
@Model(adaptables= Resource.class)
public class Apireading {
private String finalstring= new String();
private List<String>planetnamelist;
private ArrayList<String> residentslist;
private Results resultsObj;
private ArrayList<Results> resultsObjlist=new ArrayList<Results>() ;
@PostConstruct
public void activate() throws Exception {
URL url=new URL("https://swapi.co/api/planets/");
HttpsURLConnection httpsURLConnection = (HttpsURLConnection) url.openConnection();
httpsURLConnection.setRequestProperty("Accept", "*/*");
httpsURLConnection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36");
InputStream is=httpsURLConnection.getInputStream();
InputStreamReader isr=new InputStreamReader (is);
BufferedReader br = new BufferedReader(isr);
StringBuilder str=new StringBuilder();
String line =null;
line=br.readLine();//first time read
while (line != null){
str .append(line);//Line will always have something never become null ,but Bufferreader become null after reading the whole so now if we read it again it will be null
line=br.readLine();//second time reading from bufferreader now bufferreader wont be having any value it would be null
}
finalstring=str.toString();
//Dserialization of json
Gson gson=new Gson();
UniverseBean universeBean=gson.fromJson(finalstring,UniverseBean.class);
// Results[] results = universeBean.getResults();
List<Results> results = universeBean.getResults();
planetnamelist=new ArrayList<String>();
residentslist=new ArrayList<String>();
planetnamemethod(results,planetnamelist,residentslist);
}
private void planetnamemethod(List<Results> results, List<String> planetnamelist, ArrayList<String> residentslist) {
for (int i=0;i<results.size();i++){
resultsObj=new Results();
resultsObj.setName(results.get(i).getName());
resultsObj.setResidents(results.get(i).getResidents());
resultsObjlist.add(resultsObj);
}
}
public String getFinalstring() {
return finalstring;
}
public List<String> getPlanetnamelist() {
return planetnamelist;
}
public ArrayList<String> getResidentslist() {
return residentslist;
}
public Results getResultsObj() {
return resultsObj;
}
public ArrayList<Results> getResultsObjlist() {
return resultsObjlist;
}
}
UniverseBean.java
package amitsample.core.models;
import com.google.gson.annotations.SerializedName;
import java.util.List;
public class UniverseBean {
@SerializedName(value = "count")
private int count;
@SerializedName(value = "next")
private String next;
@SerializedName(value = "previous")
private String previous;
// @SerializedName(value = "results")
// private Results[] results;
//above and below both are correct in context of json but developer mainly prefer to use list as it has more methods
@SerializedName(value = "results")
private List<Results> results;
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
public String getNext() {
return next;
}
public void setNext(String next) {
this.next = next;
}
public String getPrevious() {
return previous;
}
public void setPrevious(String previous) {
this.previous = previous;
}
public List<Results> getResults() {
return results;
}
public void setResults(List<Results> results) {
this.results = results;
}
}
Results.java
package amitsample.core.models;
import com.google.gson.annotations.SerializedName;
import java.util.ArrayList;
import java.util.List;
public class Results {
@SerializedName(value = "name")
private String name;
@SerializedName(value = "rotation_period")
private String rotation_period;
@SerializedName(value = "orbital_period")
private String orbital_period;
@SerializedName(value = "diameter")
private String diameter;
@SerializedName(value = "climate")
private String climate;
@SerializedName(value = "gravity")
private String gravity;
@SerializedName(value = "terrain")
private String terrain;
@SerializedName(value = "surface_water")
private String surface_water;
@SerializedName(value = "population")
private String population;
// @SerializedName(value = "residents")
// private String[] residents;
@SerializedName(value = "residents")
private ArrayList<String> residents;
@SerializedName(value = "films")
private String[] films;
@SerializedName(value = "created")
private String created;
@SerializedName(value = "edited")
private String edited;
@SerializedName(value = "url")
private String url;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRotation_period() {
return rotation_period;
}
public void setRotation_period(String rotation_period) {
this.rotation_period = rotation_period;
}
public String getOrbital_period() {
return orbital_period;
}
public void setOrbital_period(String orbital_period) {
this.orbital_period = orbital_period;
}
public String getDiameter() {
return diameter;
}
public void setDiameter(String diameter) {
this.diameter = diameter;
}
public String getClimate() {
return climate;
}
public void setClimate(String climate) {
this.climate = climate;
}
public String getGravity() {
return gravity;
}
public void setGravity(String gravity) {
this.gravity = gravity;
}
public String getTerrain() {
return terrain;
}
public void setTerrain(String terrain) {
this.terrain = terrain;
}
public String getSurface_water() {
return surface_water;
}
public void setSurface_water(String surface_water) {
this.surface_water = surface_water;
}
public String getPopulation() {
return population;
}
public void setPopulation(String population) {
this.population = population;
}
public ArrayList<String> getResidents() {
return residents;
}
public void setResidents(ArrayList<String> residents) {
this.residents = residents;
}
public String[] getFilms() {
return films;
}
public void setFilms(String[] films) {
this.films = films;
}
public String getCreated() {
return created;
}
public void setCreated(String created) {
this.created = created;
}
public String getEdited() {
return edited;
}
public void setEdited(String edited) {
this.edited = edited;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
}
Now in sightly I have just used and the Apireading model class and and just printed over my browser:
Sightly
<div data-sly-use.search="amitsample.core.models.Apireading">
<b><u><h1 style="color:green">list of planets and their residents =======>>>>> </h1></u></b>
<ol style="list-style-type:square;" data-sly-list.resultobj=${search.resultsObjlist}>
<li style="color:red">
<h2>Planet${resultobjList.index}</h2> <h3>${resultobj.name}</h3>
<h2>Residentslist of Planet ${resultobjList.index}</h2>
<ol data-sly-list=${resultobj.residents}><li>${item}</li></ol>
</li>
</ol>
</div>
How it will look on page
AmitPandeyblog 