list转成json对象

需要的包：
1.commons-lang.jar

2.commons-beanutils.jar

3.commons-collections.jar

4.commons-logging.jar

5.ezmorph.jar

6.json-lib-2.2.2-jdk15.jar


测试的例子：
可以用这个方法JSONArray.fromObject(list).toString();

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;

import net.sf.json.JSONArray;

import com.yan.entity.Student;

public class List2Json {

    public static void main(String[] args) {
        List<Object> list = new ArrayList<Object>();
        List<Map<String, Object>> sublist = new ArrayList<Map<String, Object>>();
        Map<String, Object> map = new HashMap<String, Object>();

        map.put("abc", "123456");
        map.put("def", "hmm");
        map.put("defddf", "ftffff");
        list.add(map);

        Map<String, Object> map1 = new HashMap<String, Object>();
        map1.put("fff", "hhhh");
        map1.put("ggg", "jjj");
        map1.put("kk", "dffff");
        sublist.add(map1);

        Student st = new Student();
        st.setSid(1);
        st.setName("alec");
        st.setTeacher("scott");

        list.add(st);

        list.add(sublist);
        JSONArray json = new JSONArray();
        json.addAll(list);
        json.listIterator();
        if(json.isEmpty()){
            System.out.println("dfdfdf");
        }
        ListIterator  li = json.listIterator();
        while(li.hasNext()){
            System.out.println(li.next().toString());
        }
    }

}

上面用到的一个简单的entity

public class Student {

    public Integer sid;
    public String name;
    public String teacher;

    public Integer getSid() {
        return sid;
    }
    public void setSid(Integer sid) {
        this.sid = sid;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTeacher() {
        return teacher;
    }
    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }
}