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Java JSON

Posted on 2011-10-31
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Ive got a Java app that uses the google search api

https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q="

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The results are attached, im trying to work out how to prase the data and use it?


{"responseData": {"results":[{"GsearchResultClass":"GwebSearch","unescapedUrl":"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483","url":"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483","visibleUrl":"www.become.com","cacheUrl":"http://www.google.com/search?q\u003dcache:_rEm1_LH-O0J:www.become.com","title":"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews \u003cb\u003e...\u003c/b\u003e","titleNoFormatting":"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews ...","content":"\u003cb\u003e...\u003c/b\u003e Terry Moses Basket Gift Set, Sage The new Organic Waffle \u003cb\u003eWeave\u003c/b\u003e Moses   Basket, \u003cb\u003e...\u003c/b\u003e compare moses baskets -\u003cb\u003efiletype:pdf\u003c/b\u003e -filetype:ps -filetype:dwf -filetype:  kml \u003cb\u003e...\u003c/b\u003e"}],"cursor":{"resultCount":"1","pages":[{"start":"0","label":1}],"estimatedResultCount":"1","currentPageIndex":0,"moreResultsUrl":"http://www.google.com/search?oe\u003dutf8\u0026ie\u003dutf8\u0026source\u003duds\u0026start\u003d0\u0026hl\u003den\u0026q\u003dinurl:basket+weaving+FileType:Pdf","searchResultTime":"0.09"}}, "responseDetails": null, "responseStatus": 200}

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Question by:k3eper
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15 Comments
 
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Expert Comment

by:CEHJ
ID: 37057635
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by:for_yan
ID: 37057655



Look at this question - it has examples of  parsing JSON
http://www.experts-exchange.com/Programming/Languages/Java/Q_27068225.html
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Author Comment

by:k3eper
ID: 37057680
yeah ive installed GSON and JSON.lib but I have no idea what to do with them.

This is the code that produces the JSON string.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


class Main extends JFrame implements ActionListener,ItemListener
{
	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	String[] FileType ={"Pdf" , "Doc" , "txt" , "xls"};

	JPanel pnl ;
	JTextField txt1 ;
	JButton btn1 ;
	JTextArea txtArea ;
	JCheckBox chkpdf = new JCheckBox(FileType[0]);
	JCheckBox chkdoc = new JCheckBox(FileType[1]);
	JCheckBox chktxt = new JCheckBox(FileType[2]);
	JCheckBox chkxls = new JCheckBox(FileType[3]);
	JComboBox box;
    public String searchString;
	public Main()
		{
		super("Swing Window");
		pnl = new JPanel();
        JPanel pnl1 = new JPanel();
        pnl1.setLayout(new FlowLayout());
        JPanel pnl2 = new JPanel();
        txt1 = new JTextField(20);
        box    = new JComboBox(FileType);

        btn1 = new JButton("Search");
        txtArea = new JTextArea(20,30);
        txtArea.setLineWrap(true);

        Container container = this.getContentPane();
        container.setLayout(new BorderLayout());



        pnl.setLayout(new BorderLayout());
        pnl2.add(box);
		pnl1.add(btn1);
		pnl1.add(txt1);
        pnl.add(pnl1,BorderLayout.NORTH);
		pnl2.add(new JScrollPane(txtArea));
        pnl.add(pnl2, BorderLayout.CENTER);
		btn1.addActionListener(this);
	

        container.add(pnl);
        setSize(500, 500);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
		}

	public void actionPerformed(ActionEvent event) {
		if (event.getSource().equals(btn1)) {
		    String searchParam = txt1.getText().trim();
		    if (searchParam.trim().length() == 0) {
			String txtCheck = "Enter Query String";


			txtArea.setText(txtCheck);
             return;
		    }
			else

		    	searchString = "inurl:" + txt1.getText()+ "%20FileType:" + box.getSelectedItem() ;
				 System.out.println(searchString);//check output is correct	
				 try {
					 Search SearchObject = new Search();
					 SearchObject.searchGoog(searchString);
					    txtArea.setText(SearchObject.getLine());
					    return;
					} catch (Exception ex) {
					    ex.printStackTrace();

					}

		    }
			}



	public static void main (String[] args)
	{
	new Main();
	}



	public void itemStateChanged(ItemEvent arg0) {
		// TODO Auto-generated method stub
		
	}


}

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import java.io.*;
import java.net.*;


public class Search {
public String line;
    
    public void searchGoog(String searchString) throws IOException {
        
	URL url = new URL("https://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=" + searchString);
	URLConnection connection = url.openConnection();
        
	StringBuilder builder = new StringBuilder();
	BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String buff = null;
	while((buff = reader.readLine()) != null) {
	builder.append(buff);
        
	}
	
System.out.println(builder.toString());
        line = builder.toString();

    }
 public String getLine() {
        return line;
    
    }

    public void setLine(String line) {
        this.line = line; 
    }    
}

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Expert Comment

by:for_yan
ID: 37057686

You can download thwe JSON library form here:

http://www.roseindia.net/tutorials/json/JSONLibraries.zip

and this is an example of the code to get contents for JSON into HAshMaps, etc.

import net.sf.json.JSONObject;
import net.sf.json.JSONArray;

import java.util.*;

public class DeserializeJSON {




public static ArrayList getArrList(String jsonString){
ArrayList al = new ArrayList();
JSONObject json = JSONObject.fromObject(jsonString);
    Iterator it = json.keys();
    String ss = (String) it.next();

JSONArray jar1 = json.getJSONArray(ss);
for(int jja=0; jja<jar1.size();jja++){
    HashMap m = new HashMap();
JSONObject j1 = jar1.getJSONObject(jja);
    Iterator it1 = j1.keys();
    while(it1.hasNext()){
        String s1 = (String) it1.next();
        String val = j1.optString(s1);
         m.put(s1,val);
    }
 al.add(m);
}
return al;
}

public static void main(String [] args){
    String jsonString = "{\"hashmaps\":[{\"username\":\"abc\",\"userid\":\"1234\"},{\"username\":\"def\",\"userid\":\"5678\"}]}";
      ArrayList ar = getArrList(jsonString);
    for(int j=0; j<ar.size(); j++){
        HashMap m = (HashMap)ar.get(j);
        System.out.println("HashMap No. " + j);
        Set<String> s = m.keySet();
        for(String s0: s){
            System.out.println(s0 + ":" + (String)m.get(s0));
        }

    }
   

    
}

}

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Expert Comment

by:for_yan
ID: 37057698
But you ned the opposite way - to parse the JSON string - look at the code I psoed above.
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Expert Comment

by:for_yan
ID: 37057738
Well, it is not that straightforward but JSON is usually combined of come combination fo JSON Objects and JSON array's,
so you need to analyze it and parse accordingly. Requires a little bit of work, but with the help of these libraries it is doable -
I deriliazed a few of them when I neede several times.
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Expert Comment

by:for_yan
ID: 37057810
I am not sure you can derialize JSON easiliy for any JSON string in general but if you want
to derialize particular string on a particular site which has known structure - then after some work it is possible.
That's at least was my experience with JSON.
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Expert Comment

by:CEHJ
ID: 37057899
How you treat the data returned to you by google is really dependent on your use case. What do your users need?
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Expert Comment

by:for_yan
ID: 37058734
This is the way you parse the JSON string you
posted in your question (see output):

import net.sf.json.JSONObject;
import net.sf.json.JSONArray;

import java.util.*;

public class DeserializeJSON {




public static void analyzeJSON(String jsonString){
ArrayList al = new ArrayList();
JSONObject json = JSONObject.fromObject(jsonString);


    Iterator it = json.keys();
    String ss = null;
    while(it.hasNext()){
     ss = (String) it.next();
         System.out.println("1: " + ss);
        String sval = json.optString(ss);
      //  System.out.println("1,value: " + sval);
        if(!sval.startsWith("{") && !sval.startsWith("[") )continue;
        JSONObject json1 =  JSONObject.fromObject(sval);
         //JSONObject json1 =  json.optJSONObject(sval);
        if(json1 == null)continue;
        if(json1.isEmpty())continue;
        Iterator it1 = json1.keys();
        while(it1.hasNext()) {
            String ss1 = (String) it1.next();
              System.out.println("2: " + ss1);
              String sval1 = json1.optString(ss1);
         //    System.out.println("2,value: " + sval1);
              JSONArray jar = json1.optJSONArray(ss1);
             JSONObject json3 = json1.optJSONObject(ss1);

         //   System.out.println("for " + ss1 + " : " + jar);
            if(jar != null){
             for (int j=0; j<jar.size(); j++){
                // System.out.println("array for " + ss1 + " num " + j + ": "  + jar.get(j));

                 JSONObject json2 = JSONObject.fromObject(jar.get(j));
                  Iterator it2 = json2.keys();
                 while(it2.hasNext()){
                     String ss2 = (String)it2.next();
                     String sval2 = json2.optString(ss2);
                     System.out.println("3: (key, value): " + ss2 + " , " + sval2);

                 }


             }

            } else {

                Iterator it3 = json3.keys();
                  while(it3.hasNext()){
                     String ss3 = (String)it3.next();
                     String sval3 = json3.optString(ss3);
                     System.out.println("4: (key, value): " + ss3 + " , " + sval3);
                      JSONArray jar2 = json3.optJSONArray(ss3);
                      if(jar2 != null){
     for (int j=0; j<jar2.size(); j++){
                 System.out.println("array for " + ss3 + " num " + j + ": "  + jar2.get(j));

                 JSONObject json4 = JSONObject.fromObject(jar2.get(j));
                  Iterator it4 = json4.keys();
                 while(it4.hasNext()){
                     String ss4 = (String)it4.next();
                     String sval4 = json4.optString(ss4);
                     System.out.println("5: (key, value): " + ss4 + " , " + sval4);

                 }


             }


                      }

                 }


            }

             


        }

        //JSONObject json1 = JSONObject.fromObject(ss);
      //  JSONArray jar1 = json.getJSONArray(ss);
       // System.out.println(jar1.size());


    }
     /*
JSONArray jar1 = json.getJSONArray(ss);
for(int jja=0; jja<jar1.size();jja++){
    HashMap m = new HashMap();
JSONObject j1 = jar1.getJSONObject(jja);
    Iterator it1 = j1.keys();
    while(it1.hasNext()){
        String s1 = (String) it1.next();
        String val = j1.optString(s1);
         m.put(s1,val);
    }
 al.add(m);
}
    */
//return al;
}

public static void main(String [] args){

  String jsonString =  "{\"responseData\": {\"results\":[{\"GsearchResultClass\":\"GwebSearch\",\"unescapedUrl\":\"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483\",\"url\":\"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483\"," +
          "\"visibleUrl\":\"www.become.com\",\"cacheUrl\":\"http://www.google.com/search?q\u003dcache:_rEm1_LH-O0J:www.become.com\",\"title\":\"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews \u003cb\u003e...\u003c/b\u003e\"," +
          "\"titleNoFormatting\":\"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews ...\",\"content\":\"\u003cb\u003e...\u003c/b\u003e Terry Moses Basket Gift Set, Sage The new Organic Waffle \u003cb\u003eWeave\u003c/b\u003e Moses   Basket, \u003cb\u003e...\u003c/b\u003e compare moses baskets -\u003cb\u003efiletype:pdf\u003c/b\u003e -filetype:ps " +
          "-filetype:dwf -filetype:  kml \u003cb\u003e...\u003c/b\u003e\"}],\"cursor\":{\"resultCount\":\"1\",\"pages\":[{\"start\":\"0\",\"label\":1}],\"estimatedResultCount\":\"1\",\"currentPageIndex\":0,\"moreResultsUrl\":\"http://www.google.com/search?oe\u003dutf8\u0026ie\u003dutf8\u0026source\u003duds\u0026start\u003d0\u0026hl\u003den\u0026q\u003dinurl:basket+weaving+FileType:Pdf\"," +
          "\"searchResultTime\":\"0.09\"}}, \"responseDetails\": null, \"responseStatus\": 200}";
    //String jsonString = "{\"hashmaps\":[{\"username\":\"abc\",\"userid\":\"1234\"},{\"username\":\"def\",\"userid\":\"5678\"}]}";
      analyzeJSON(jsonString);
        /*
    for(int j=0; j<ar.size(); j++){
        HashMap m = (HashMap)ar.get(j);
        System.out.println("HashMap No. " + j);
        Set<String> s = m.keySet();
        for(String s0: s){
            System.out.println(s0 + ":" + (String)m.get(s0));
        }


    }

    */



}

}

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Output:
1: responseData
2: results
3: (key, value): GsearchResultClass , GwebSearch
3: (key, value): unescapedUrl , http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483
3: (key, value): url , http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483
3: (key, value): visibleUrl , www.become.com
3: (key, value): cacheUrl , http://www.google.com/search?q=cache:_rEm1_LH-O0J:www.become.com
3: (key, value): title , Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews <b>...</b>
3: (key, value): titleNoFormatting , Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews ...
3: (key, value): content , <b>...</b> Terry Moses Basket Gift Set, Sage The new Organic Waffle <b>Weave</b> Moses   Basket, <b>...</b> compare moses baskets -<b>filetype:pdf</b> -filetype:ps -filetype:dwf -filetype:  kml <b>...</b>
2: cursor
4: (key, value): resultCount , 1
4: (key, value): pages , [{"start":"0","label":1}]
array for pages num 0: {"start":"0","label":1}
5: (key, value): start , 0
5: (key, value): label , 1
4: (key, value): estimatedResultCount , 1
4: (key, value): currentPageIndex , 0
4: (key, value): moreResultsUrl , http://www.google.com/search?oe=utf8&ie=utf8&source=uds&start=0&hl=en&q=inurl:basket+weaving+FileType:Pdf
4: (key, value): searchResultTime , 0.09
1: responseDetails
1: responseStatus

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Author Comment

by:k3eper
ID: 37059076
thanks for the responses, the idea is to return the restults and display the title as actionable allowing to download the file if you want to do so.
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Expert Comment

by:for_yan
ID: 37059087
then you parse in the way I sohowed and then store title vs. the  URL of the file in the HashMap
and then ddispaly list iof titles - as user clickes onn the title you go to the address of the file and download it
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Author Comment

by:k3eper
ID: 37059125
I want to GREP everything but the title and the actual URL so I can retrieve the file. The code about is only formatting the data into something more readable and passing the data into some arrays. Is that correct?
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Expert Comment

by:for_yan
ID: 37059135
Wait a moment , I'll return you the HashMap with the required data
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Expert Comment

by:for_yan
ID: 37059215
This retrievs list of titles and hashmap of titles - URLs  (se at the bottom of the output - after all thisi debugging output).

Of course this is specific to eeaxctly this struictur of JSON
If JSON has different structure you need to modify
the program

import net.sf.json.JSONObject;
import net.sf.json.JSONArray;

import java.util.*;

public class DeserializeJSON {


    static HashMap<String,String> titlesToURLs;
   static  ArrayList<String>titles;

public static void analyzeJSON(String jsonString){
ArrayList al = new ArrayList();
JSONObject json = JSONObject.fromObject(jsonString);


    Iterator it = json.keys();
    String ss = null;
    while(it.hasNext()){
     ss = (String) it.next();
         System.out.println("1: " + ss);
        String sval = json.optString(ss);
      //  System.out.println("1,value: " + sval);
        if(!sval.startsWith("{") && !sval.startsWith("[") )continue;
        JSONObject json1 =  JSONObject.fromObject(sval);
         //JSONObject json1 =  json.optJSONObject(sval);
        if(json1 == null)continue;
        if(json1.isEmpty())continue;
        Iterator it1 = json1.keys();
        while(it1.hasNext()) {
            String ss1 = (String) it1.next();
              System.out.println("2: " + ss1);
              String sval1 = json1.optString(ss1);
         //    System.out.println("2,value: " + sval1);
              JSONArray jar = json1.optJSONArray(ss1);
             JSONObject json3 = json1.optJSONObject(ss1);

         //   System.out.println("for " + ss1 + " : " + jar);
            if(jar != null){
             for (int j=0; j<jar.size(); j++){
                // System.out.println("array for " + ss1 + " num " + j + ": "  + jar.get(j));

                 JSONObject json2 = JSONObject.fromObject(jar.get(j));
                  Iterator it2 = json2.keys();
                 String URLString = null;
                 String titleString = null;
                 while(it2.hasNext()){
                     String ss2 = (String)it2.next();
                     String sval2 = json2.optString(ss2);
                     System.out.println("3: (key, value): " + ss2 + " , " + sval2);
                     if(ss2.equals("unescapedUrl")) { URLString = sval2;}

                     if(ss2.equals("title")) { titleString = sval2;
                     titles.add(titleString);
                         titlesToURLs.put(titleString,URLString );
                         // titleString = null;
                        // URLString = null;


                     }

                     

                     }

                 }




            } else {

                Iterator it3 = json3.keys();
                  while(it3.hasNext()){
                     String ss3 = (String)it3.next();
                     String sval3 = json3.optString(ss3);
                     System.out.println("4: (key, value): " + ss3 + " , " + sval3);
                      JSONArray jar2 = json3.optJSONArray(ss3);
                      if(jar2 != null){
     for (int j=0; j<jar2.size(); j++){
                 System.out.println("array for " + ss3 + " num " + j + ": "  + jar2.get(j));

                 JSONObject json4 = JSONObject.fromObject(jar2.get(j));
                  Iterator it4 = json4.keys();
                 while(it4.hasNext()){
                     String ss4 = (String)it4.next();
                     String sval4 = json4.optString(ss4);
                     System.out.println("5: (key, value): " + ss4 + " , " + sval4);

                 }


             }


                      }

                 }


            }

             


        }

    
    }
  }

public static void main(String [] args){
    titles = new ArrayList<String>();
        titlesToURLs = new HashMap<String, String>();
    

  String jsonString =  "{\"responseData\": {\"results\":[{\"GsearchResultClass\":\"GwebSearch\",\"unescapedUrl\":\"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483\",\"url\":\"http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483\"," +
          "\"visibleUrl\":\"www.become.com\",\"cacheUrl\":\"http://www.google.com/search?q\u003dcache:_rEm1_LH-O0J:www.become.com\",\"title\":\"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews \u003cb\u003e...\u003c/b\u003e\"," +
          "\"titleNoFormatting\":\"Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews ...\",\"content\":\"\u003cb\u003e...\u003c/b\u003e Terry Moses Basket Gift Set, Sage The new Organic Waffle \u003cb\u003eWeave\u003c/b\u003e Moses   Basket, \u003cb\u003e...\u003c/b\u003e compare moses baskets -\u003cb\u003efiletype:pdf\u003c/b\u003e -filetype:ps " +
          "-filetype:dwf -filetype:  kml \u003cb\u003e...\u003c/b\u003e\"}],\"cursor\":{\"resultCount\":\"1\",\"pages\":[{\"start\":\"0\",\"label\":1}],\"estimatedResultCount\":\"1\",\"currentPageIndex\":0,\"moreResultsUrl\":\"http://www.google.com/search?oe\u003dutf8\u0026ie\u003dutf8\u0026source\u003duds\u0026start\u003d0\u0026hl\u003den\u0026q\u003dinurl:basket+weaving+FileType:Pdf\"," +
          "\"searchResultTime\":\"0.09\"}}, \"responseDetails\": null, \"responseStatus\": 200}";
    //String jsonString = "{\"hashmaps\":[{\"username\":\"abc\",\"userid\":\"1234\"},{\"username\":\"def\",\"userid\":\"5678\"}]}";
      analyzeJSON(jsonString);

      System.out.println("\n\n\nResults\n\n\n");
    System.out.println("Arraylist of names: " + titles);
    System.out.println("HashMap of names-URLs: " + titlesToURLs);


      


}

}

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Output:
1: responseData
2: results
3: (key, value): GsearchResultClass , GwebSearch
3: (key, value): unescapedUrl , http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483
3: (key, value): url , http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483
3: (key, value): visibleUrl , www.become.com
3: (key, value): cacheUrl , http://www.google.com/search?q=cache:_rEm1_LH-O0J:www.become.com
3: (key, value): title , Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews <b>...</b>
3: (key, value): titleNoFormatting , Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews ...
3: (key, value): content , <b>...</b> Terry Moses Basket Gift Set, Sage The new Organic Waffle <b>Weave</b> Moses   Basket, <b>...</b> compare moses baskets -<b>filetype:pdf</b> -filetype:ps -filetype:dwf -filetype:  kml <b>...</b>
2: cursor
4: (key, value): resultCount , 1
4: (key, value): pages , [{"start":"0","label":1}]
array for pages num 0: {"start":"0","label":1}
5: (key, value): start , 0
5: (key, value): label , 1
4: (key, value): estimatedResultCount , 1
4: (key, value): currentPageIndex , 0
4: (key, value): moreResultsUrl , http://www.google.com/search?oe=utf8&ie=utf8&source=uds&start=0&hl=en&q=inurl:basket+weaving+FileType:Pdf
4: (key, value): searchResultTime , 0.09
1: responseDetails
1: responseStatus



Results



Arraylist of names: [Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews <b>...</b>]
HashMap of names-URLs: {Beautiful Baby Blue Dot Moses Basket Gift - Prices, Reviews <b>...</b>=http://www.become.com/beautiful-baby-blue-dot-moses-basket-gift--compare-prices--sc1207271483}

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for_yan earned 2000 total points
ID: 37059901
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Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
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