Question

i write this code to read json data , and there is an error when run the code

first this is the code i write ( i changed the code to correct the json string but the problem still exist )

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

public class defaults {

    public static void main(String[] args) {
        String jsonTxt = "{lhs: \"100 Euros\",rhs: \"128.551738 Australian dollars\",error: \"\",icc: true}";        
         JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );
        String title = json.getString("title");               
        System.out.println( "title: " + title );
    }
}

and i have found this error when run the code

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source).....

the error gone away if i remove lines that talks about json

Answer 1

String jsonTxt = "{'lhs': '100 Euros','rhs':'128.551738 Australian dollars','error':'','icc': 'true'}";        
JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );
System.out.println( "lhs: " + json.getString("lhs") );
System.out.println( "rhs: " + json.getString("rhs") );
System.out.println( "error: " + json.getString("error") );
System.out.println( "icc: " + json.getString("icc") );

OUTPUT:

lhs: 100 Euros
rhs: 128.551738 Australian dollars
error: 
icc: true

you can give the json string with double quotes(“) or single quotes(‘) or key without quotes. All works.

you need following jars:

1. commons-lang-2.4.jar
2. ezmorph-1.0.jar
3. json-lib-0.9.jar

for adding the jars through eclipse:

1.right click on project folder
2.click on prperties
3.select "java build path"
4.select libraries tab
5.click on "Add External jars"
6.Browse your jars, select and click ok.