JSONArray和JSONObject的使用
发布时间：2020-12-16 19:43:40 所属栏目：百科 来源：网络整理
导读：首先需要使用如下的jar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 其次给出一个测试例子： //////////////////////////// 给出一个常见的JavaBean public
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首先需要使用如下的jar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 其次给出一个测试例子： //////////////////////////// 给出一个常见的JavaBean public class BookInfo { private String name; private float price; private int num; public BookInfo(){ } public BookInfo(String name,float price,int num){ this.name=name; this.price=price; this.num=num; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } public int getNum() { return num; } public void setNum(int num) { this.num = num; } } /////////////////////////// import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class TestJSON { public TestJSON(){ } public static void main(String[] args) { BookInfo book=new BookInfo(); book.setName("java"); book.setNum(10); book.setPrice(1.5f); System.out.println(JSONArray.fromObject(book).toString()); //输出[{"name":"java","num":10,"price":1.5}] BookInfo book2=new BookInfo("C#",31.9f,30); BookInfo book3=new BookInfo("C#",32.9f,30); BookInfo book4=new BookInfo("C#",33.9f,30); BookInfo book5=new BookInfo("C#",35.9f,30); BookInfo book6=new BookInfo("C#",44.9f,30); List<BookInfo>list=new ArrayList<BookInfo>(); list.add(book6);list.add(book5);list.add(book4);list.add(book3);list.add(book2); // 集合list转成json数据 JSONArray array=JSONArray.fromObject(list); System.out.println("JSONArray格式"+array.size()+"个，内容："+array.toString()); //输出 ：JSONArray格式5个，内容：[{"name":"C#","num":30,"price":44.9},{"name":"C#","price":35.9},"price":33.9},"price":32.9},"price":31.9}] System.out.println("第2个内容是"+array.get(2).toString()+"从第0个开始"); //输出： 第2个内容是{"name":"C#","price":33.9}从第0个开始 // map转成json代码 Map map=new HashMap(); map.put("name","书籍"); map.put("bool",Boolean.TRUE); map.put("int",new Integer(1)); map.put("arr",new String[] {"a","b"}); map.put("fun","function(i){return this.arr[i];}"); JSONObject json=JSONObject.fromObject(map); System.out.println("JSONObject格式："+json.toString()); //输出：JSONObject格式：{"arr":["a","b"],"int":1,"name":"书籍","fun":function(i){return this.arr[i];},"bool":true} System.out.println(json.get("name")+":"+json.get("fun")); //输出：书籍:function(i){return this.arr[i];} // 数据转成JSON boolean[] boolArray = new boolean[] { true,false,true }; JSONArray jsonArray1 = JSONArray.fromObject(boolArray); System.out.println(jsonArray1.size()); //输出： 3 System.out.println("Bean转换成json代码 "); System.out.println(jsonArray1.toString()); //输出：[true,true] // 一般数据转成JSON System.out.println(JSONArray.fromObject("['json','is','easy']")); //输出：["json","is","easy"] System.out.println("第0个是："+JSONArray.fromObject("['json','easy']").get(0)); //输出：第0个是：json } } （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |