关于JSON

Java基本类型，List，Map 转化为JSON格式：

Person.java

import java.util.Date; public class Person { private String name; private int age; private String birthday; public Person(String name,int age,String birthday){ this.name = name; this.age = age; this.birthday = birthday; } 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; } public String getBirthday() { return birthday; } public void setBirthday(String birthday) { this.birthday = birthday; } }
JSONTest.java

import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.zip.DataFormatException; import net.sf.json.JSONArray; public class JSONTest { private String title; // 标题 private String author; // 作者 private float price; // 定价 private String publication; // 出版日期 private List<Person> persons = new ArrayList<Person>(); // List private Map map = new HashMap(); // Map public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } public String getPublication() { return publication; } public void setPublication(String publication) { this.publication = publication; } public List<Person> getPersons() { return persons; } public void setPersons(List<Person> persons) { this.persons = persons; } public Map getMap() { return map; } public void setMap(Map map) { this.map = map; } public static void main(String[] args) throws ParseException { JSONTest mj = new JSONTest(); // 日期设置 Date d = new Date(); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); String date = sdf.format(d); // 为属性设置值 mj.setTitle("乔布斯传记"); mj.setAuthor("未知"); mj.setPrice(100.0f); mj.setPublication(date); // 设置List List<Person> list = new ArrayList<Person>(); list.add(new Person("zhangsan", 20, date)); mj.setPersons(list); // 设置Map Map map = new HashMap(); map.put("a", "i am a"); map.put("b", "i am b"); mj.setMap(map); //调用JSONArray.fromObject()方法 转化为JSON对象 JSONArray jsons = JSONArray.fromObject(mj); System.out.println(jsons.toString()); } }
在使用JSON时 不只是引入一个JSON包就可以的 不然会报java.lang.ClassNotFoundException:异常

JSON所依赖jar包如下(共6个)

commons-beanutils-1.8.3.jar

commons-lang-2.1.jar

ezmorph-1.0.2.jar

json-lib-2.4-jdk15.jar

如果出现如下错误 说明还缺少如下包

java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap

commons-collections-3.2.jar

java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

commons-logging-1.1.1.jar