I have included a Java code where I need to find a way to convert HashMap to JSO

ID: 3748355 • Letter: I

Question

I have included a Java code where I need to find a way to convert HashMap to JSON. Is there a way that I can do this as I am not familiar with how to use JSON?

//Response Header Imports
import java.net.*;
import java.util.List;
import java.util.Map;
import java.io.IOException;
/////////////////////////////////
import org.apache.catalina.Server;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import java.util.HashMap;
import java.util.Map;

import java.security.cert.X509Certificate;
import javax.net.*;
import java.net.URL;
import javax.net.ssl.*;
import java.security.cert.Certificate;
import java.net.MalformedURLException;
import java.io.IOException;
import java.security.cert.*;

public class ServerAnalyzerBackEnd {

private String url;
private boolean validURL;

    public ServerAnalyzerBackEnd(String url) {
        this.url = url;
        this.validURL = validateURLSyntax();
    }

public ModelAndView start() {
String host;

        Map params = new HashMap<>();
        params.put("url", url);
        String secureURL = "";
        URL testURL;
        int port;
        String cert_chain = "";

        if (!validURL)
        {
            System.out.println("We should probably stop it here or something.");
        }
        //url is not null, assign to secureURL to create https connection
        if(url != null){
            secureURL = url;
        }

        //Initialize Strings for later output
        String response_header = "";
        String cipherSuite = "";

        //create URL object from 'url'
        //create https connection based off of url and then call getCertChain method to pull that cert chain
        try {
            testURL = new URL(secureURL);
            port = testURL.getPort();
            host = testURL.getHost();

SSLSocketFactory socketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
Socket socket = socketFactory.createSocket(host, port);

            SSLSession session = ((SSLSocket) socket).getSession();
            cipherSuite = session.getCipherSuite();
            System.out.println("Cipher is " + session.getCipherSuite());

            HttpsURLConnection connection = (HttpsURLConnection)testURL.openConnection();
            cert_chain = getCertChain(session);
            System.out.println(cert_chain);
            response_header = getResponseHeader(connection);
        }
        catch(MalformedURLException e){
            e.printStackTrace();
        }
        catch(IOException e){
            e.printStackTrace();
        }

        //Put strings into Hash Map to be displayed in output
        params.put("response_header", response_header);
        params.put("certificate_chain", cert_chain);
        params.put("cipher_suite", cipherSuite);
        return new ModelAndView("showURL", params);
    }

    public String getCertChain(SSLSession session){
            String result = "";
            try{

//make array of Certificate objects and grab the cert chain from the https connection
Certificate[] certificates = session.getPeerCertificates();

                //foreach c in Certificates print cert details to console.
                for(int i = 0; i < certificates.length; i++){
                    X509Certificate cert = (X509Certificate) certificates[i];
                    result += (cert.getSubjectX500Principal());
                }
            }
            /*
            catch (SSLPeerUnverifiedException e){
                e.printStackTrace();
            } */
            catch (IOException e){
                e.printStackTrace();
            }

            //System.out.println(result);
            return result;
    }

public String getResponseHeader(HttpsURLConnection connection){
String result = "Key 'Content-Type' is not found!";

        //Response Header Function
        try {
            System.out.println("HTTP Headers");
            System.out.println();

            Map> map = connection.getHeaderFields();
            for (Map.Entry> entry : map.entrySet()) {
                System.out.println(entry.getKey() + ": " + entry.getValue());
            }
            System.out.println();
            System.out.println("Get Header by key:");
            String server = connection.getHeaderField("Content-Type");

            if (server != null) {
                result = "Content-Type: " + server;
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println(result);
        return result;
    }

    public boolean validateURLSyntax()
    {
        int firstColon;
        int secondColon;
        boolean URLsyntax = true;

        //Checks if the first four characters are http
        if (!this.url.substring(0,4).equals("http"))
        {
            URLsyntax = false;
        }

        //Checks if a port number was specified. If not, appends :443 to the URL.
        firstColon = this.url.indexOf(":");
        secondColon = this.url.lastIndexOf(':');

        if (secondColon == -1 || firstColon == secondColon)
        {
            this.url = this.url + ":443";
        }

        //Something like https://www.google.com: and no port actually specified or junk is after the port.
        secondColon = this.url.lastIndexOf(':');
        if (this.url.charAt(this.url.length() - 1) == ':' || !Character.isDigit(this.url.charAt(secondColon + 1)))
        {
            URLsyntax = false;
        }
        return URLsyntax;
    }

}

Explanation / Answer

Solution:

/*IF I CONSIDER THAT YOU WANT TO

* CONVERT THIS params MAP TO JSON

* THE MOST SIMPLE WAY TO DO IT

* IS USING JSONObject CLASS FROM org.json PACKAGE.

* YOU HAVE TO INCLUDE org.json JAR IN YOUR

* CLASS PATH IN ORDER TO USE IT. THE FULLY

* QUALIFIED CLASS NAME IS org.json.JSONObject

Please find below the code of start() method where the map is converted into JSON object.

package aug9;

//Response Header Imports

import java.net.*;

import java.util.List;

import java.util.Map;

import java.io.IOException;

/////////////////////////////////

import org.apache.catalina.Server;

import org.json.JSONObject;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.servlet.ModelAndView;

import java.util.HashMap;

import java.util.Map;

import java.security.cert.X509Certificate;

import javax.net.*;

import java.net.URL;

import javax.net.ssl.*;

import java.security.cert.Certificate;

import java.net.MalformedURLException;

import java.io.IOException;

import java.security.cert.*;

public class ServerAnalyzerBackEnd {

private String url;

private boolean validURL;

public ServerAnalyzerBackEnd(String url) {

this.url = url;

this.validURL = validateURLSyntax();

}

public ModelAndView start() {

String host;

Map params = new HashMap<>();

params.put("url", url);

String secureURL = "";

URL testURL;

int port;

String cert_chain = "";

if (!validURL)

{

System.out.println("We should probably stop it here or something.");

}

//url is not null, assign to secureURL to create https connection

if(url != null){

secureURL = url;

}

//Initialize Strings for later output

String response_header = "";

String cipherSuite = "";

//create URL object from 'url'

//create https connection based off of url and then call getCertChain method to pull that cert chain

try {

testURL = new URL(secureURL);

port = testURL.getPort();

host = testURL.getHost();

SSLSocketFactory socketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();

Socket socket = socketFactory.createSocket(host, port);

SSLSession session = ((SSLSocket) socket).getSession();

cipherSuite = session.getCipherSuite();

System.out.println("Cipher is " + session.getCipherSuite());

HttpsURLConnection connection = (HttpsURLConnection)testURL.openConnection();

cert_chain = getCertChain(session);

System.out.println(cert_chain);

response_header = getResponseHeader(connection);

}

catch(MalformedURLException e){

e.printStackTrace();

}

catch(IOException e){

e.printStackTrace();

}

//Put strings into Hash Map to be displayed in output

params.put("response_header", response_header);

params.put("certificate_chain", cert_chain);

params.put("cipher_suite", cipherSuite);

/*IF I CONSIDER THAT YOU WANT TO

* CONVERT THIS params MAP TO JSON

* THE MOST SIMPLE WAY TO DO IT

* IS USING JSONObject CLASS FROM org.json PACKAGE.

* YOU HAVE TO INCLUDE org.json JAR IN YOUR

* CLASS PATH IN ORDER TO USE IT. THE FULLY

* QUALIFIED CLASS NAME IS org.json.JSONObject

JSONObject json = new JSONObject(params);

return new ModelAndView("showURL", params);

}

public String getCertChain(SSLSession session){

String result = "";

try{

//make array of Certificate objects and grab the cert chain from the https connection

Certificate[] certificates = session.getPeerCertificates();

//foreach c in Certificates print cert details to console.

for(int i = 0; i < certificates.length; i++){

X509Certificate cert = (X509Certificate) certificates[i];

result += (cert.getSubjectX500Principal());

}

catch (SSLPeerUnverifiedException e){

e.printStackTrace();

} */

catch (IOException e){

e.printStackTrace();

}

//System.out.println(result);

return result;

}

public String getResponseHeader(HttpsURLConnection connection){

String result = "Key 'Content-Type' is not found!";

//Response Header Function

try {

System.out.println("HTTP Headers");

System.out.println();

Map> map = connection.getHeaderFields();

for (Map.Entry> entry : map.entrySet()) {

System.out.println(entry.getKey() + ": " + entry.getValue());

}

System.out.println();

System.out.println("Get Header by key:");

String server = connection.getHeaderField("Content-Type");

if (server != null) {

result = "Content-Type: " + server;

}

} catch (Exception e) {

e.printStackTrace();

}

System.out.println(result);

return result;

}

public boolean validateURLSyntax()

{

int firstColon;

int secondColon;

boolean URLsyntax = true;

//Checks if the first four characters are http

if (!this.url.substring(0,4).equals("http"))

{

URLsyntax = false;

}

//Checks if a port number was specified. If not, appends :443 to the URL.

firstColon = this.url.indexOf(":");

secondColon = this.url.lastIndexOf(':');

if (secondColon == -1 || firstColon == secondColon)

{

this.url = this.url + ":443";

}

//Something like https://www.google.com: and no port actually specified or junk is after the port.

secondColon = this.url.lastIndexOf(':');

if (this.url.charAt(this.url.length() - 1) == ':' || !Character.isDigit(this.url.charAt(secondColon + 1)))

{

URLsyntax = false;

}

return URLsyntax;

}

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