java中得到json格式的数据

今天看easyui,要返回json格式的数据到页面上。

1.json相关的6个包，要全部导入。

2.测试

package testPackage;

import java.util.ArrayList;
import java.util.List;
import net.sf.json.JSONArray;

public class TestJson {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        List<Student> sList = new ArrayList<Student>();
        sList.add(new Student("张三",23));
        sList.add(new Student("李四",15));
        sList.add(new Student("王五",45));
        sList.add(new Student("赵六",34));
        
        System.out.println(JSONArray.fromObject(sList).toString());
    }
}

package testPackage;
public class Student{
    private String name;
    private int age;
    
    public Student() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Student(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

3.结果

4.注意

　　1. 测试代码中的student类必须为public，否则会报错Caused by: java.lang.NoSuchMethodException: Property 'age' has no getter method

　　2. 6个包要全部导入。