Java.lang.noclassdeffounderror Error Resolution (for Jsonarray and jsonobject use) __42286

Today I want to convert a string type to a JSON array format, but always report java.lang.noclassdeffounderror errors, and finally I solve the problem, the following steps to solve

First, the introduction of the package

It is not enough to introduce a json-lib jar package for the program to be introduced, and the following additional packages must be introduced

1, Commons-beanutils.jar

2, Commons-collections-3.2.jar

3, Commons-lang-2.5.jar

4, Commons-logging-1.1.1.jar

5, Ezmorph-1.0.4.jar

6, Json-lib-2.4-jdk15.jar

The introduction of these packages to ensure the normal operation of abbreviated code

Ii. specific applications (use of Jsonarray)

Package zyj.com;

Import java.util.List;
Import Net.sf.json.JSONArray;

public class Jsontest {public
	static void Main (string[] args) {
		Jsonarray jsonobject = Jsonarray.fromobject ("[{] Name ': ' Huangbiao ', ' age ': 15},{' name ': ' Liumei ', ' Age ':}] ';
		List<studentpo> student=jsonobject.tolist (jsonobject,studentpo.class);
		for (Studentpo studentpo:student) {
			System.out.println (studentpo.getname () + ";" +studentpo.getage ());}}

Results:

Huangbiao;15
liumei;14

Iii. the difference between Jsonarray and Jsonobject

Jsonobject is an object that is wrapped up in {};

Jsonarray is an array of [] wrapped;