Sunday, 5 October 2008

Simple List to Json example

Download 6 package jar files

commons-lang 2.3
commons-beanutils 1.7.0
commons-collections 3.2
commons-logging 1.1
ezmorph 1.0.4.jar
json-lib-2.2.2-jdk15.jar

Download all

=== Test source from List to Json ====
============== JsonTest =======================
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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


public class JsonTest {

public void Bean2Json(){
MyBean myBean1 = new MyBean();
myBean1.setId(1);
myBean1.setName("a");

MyBean myBean2 = new MyBean();
myBean2.setId(2);
myBean2.setName("b");

List mybeanList = new ArrayList();
mybeanList.add(myBean1);
mybeanList.add(myBean2);

JSONArray jsonArray = JSONArray.fromObject(mybeanList);
System.out.println("==== : "+jsonArray);

Map map = new HashMap();
map.put("beanlist", jsonArray);

JSONObject jsonObject = JSONObject.fromObject(map);
System.out.println("==== json :"+jsonObject);
}
}

======= MyBean.java =======

public class MyBean {

private int Id;
private String Name;

public int getId() {
return Id;
}
public void setId(int id) {
Id = id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}


}


===== runtTest.java =========


public class runTest {

/**
* @param args
*/
public static void main(String[] args) {
JsonTest jsonTest = new JsonTest();
jsonTest.Bean2Json();

}

}

9 comments:

Raghu said...

Excellent, Simple and Complete Post !

Thank you for ur post. :)

Ron said...

thanks
works fine

:)

mashy88 said...

hey can u help me with JSON datgrid in extjs..pls..

my json output from the servlet is :

{
"head": {
"vars": [ "s" , "fname" , "lname" ]
} ,
"results": {
"bindings": [
{
"s": { "type": "uri" , "value": "http://tn.gov.in/Person/41" } ,
"fname": { "type": "literal" , "value": "Gayathri" } ,
"lname": { "type": "literal" , "value": "Vasudevan" }
} ,
{
"s": { "type": "uri" , "value": "http://tn.gov.in/Person/37" } ,
"fname": { "type": "literal" , "value": "Magesh" } ,
"lname": { "type": "literal" , "value": "Vasudevan" }
} ,
{
"s": { "type": "uri" , "value": "http://tn.gov.in/Person/39" } ,
"fname": { "type": "literal" , "value": "Vasudevan " } ,
"lname": { "type": "literal" , "value": "Srinivasan" }
}
]
}
}


my problem is i am not getting my grid rendered, soemtime servlet not called , and sometimes an empty grid..!

Kinjan Ajudiya said...

yes mashy .. i got same problem...i got jsonarray from arraylist but there is problem in parsing that jsonarray to grid...pls some one help me ...

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