javascript,JSONObject,JSONArray,json,解析,构造
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JSON-lib包（最关键的两个类分别是JSONObject和JSONArray）完成对json的构造和一些基本方法的使用。cili源码,ubuntu怎么装程序,tomcat可以多大并发量,爬虫网页索引,php安全基础详解,云阳一站式seo推广代运营lzw
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①JSONObject构造的字符串是键值对形式（key:value），多个键值对间以英文逗号连接；爱客影院源码下载,ubuntu ip设置工具,tomcat部署3种方式,智联 爬虫,php在线解释,海南网络seo关键词优化教程lzw
②JSONArray构造的字符串是数组形式（[array1,array2,…]）。需要使用的包下载链接：
A、JSONObject的使用。
（1）JSON字符串的两种构造方法：
①使用Java对象；②使用Map集合。
步骤一：首先新建Java工程，导入依赖包；
步骤二：建立两个测试类：
Teacher.java
package com.snnu.json;import java.util.List;public class Teacher {private String name;private String sex;private int age;private List myTool; public Teacher(){ } public Teacher(String name,String sex,int age,List myTool){this.name = name;this.sex = sex;this.age = age;this.myTool = myTool; }public String getName() {return name; }public void setName(String name) {this.name = name; }public String getSex() {return sex; }public void setSex(String sex) {this.sex = sex; }public int getAge() {return age; }public void setAge(int age) {this.age = age; }public List getMyTool() {return myTool; }public void setMyTool(List myTool) {this.myTool = myTool; }}Transport.javapackage com.snnu.json;public class Transport { private String name;private float price; public Transport(){ } public Transport(String name,float price){this.name = name;this.price = price; } 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; } }步骤三：写main方法方式一：
package com.snnu.json;import java.util.ArrayList;import java.util.List;import net.sf.json.JSONObject;public class Demo_creajsonFromObject {// 利用java对象生成json字符串public JSONObject createJsonFromObject(Object object) {return JSONObject.fromObject(object); }public static void main(String[] args) {// TODO Auto-generated method stubDemo_creajsonFromObject demo = new Demo_creajsonFromObject(); Teacher t = new Teacher(); t.setName("张三"); t.setSex("男"); t.setAge(21); Transport bike = new Transport("自行车", 267); Transport motorcycle = new Transport("摩托车", 3267); Transport car = new Transport("小汽车", 100000); List tools = new ArrayList(); tools.add(bike); tools.add(motorcycle); tools.add(car); t.setMyTool(tools); JSONObject ob = demo.createJsonFromObject(t); System.out.println(ob); }} 生成的json字符串为：{ "age": 21, "myTool": [ { "name": "自行车", "price": 267 }, { "name": "摩托车", "price": 3267 }, { "name": "小汽车", "price": 100000 } ], "name": "张三", "sex": "男"} 方式二：package com.snnu.json;import java.util.HashMap;import java.util.Map;import net.sf.json.JSONObject;public class Demo_creajsonFromMap {//使用map集合生成json字符串public JSONObject createJsonFromMap(Map map){ JSONObject jsob=new JSONObject(); jsob.putAll(map);return jsob; } public static void main(String[] args) {// TODO Auto-generated method stubDemo_creajsonFromMap demo=new Demo_creajsonFromMap(); Map mmap=new HashMap(); mmap.put("name", "张三"); mmap.put("sex", "男"); mmap.put("age", "21"); JSONObject ob=demo.createJsonFromMap(mmap); System.out.println(ob); }}生成的json字符串为：{"sex": "男","name": "张三","age": "21"}（2）JSONObject的三个常用方法举例。package com.snnu.json;import java.util.ArrayList;import java.util.List;import net.sf.json.JSONObject;public class MethodTest {//put方法：在一个json中插入一个节点，若该节点已存在，则该节点的值将会被替换public JSONObject testPut(){ JSONObject jo1=new JSONObject(); jo1.put("a", "1"); jo1.put("b", "2"); jo1.put("c", "3"); Transport bike=new Transport("bike",200); jo1.put("d", bike); List list=new ArrayList(); list.add("one"); list.add("two"); list.add("three"); jo1.put("e", list); jo1.put("a", "100"); return jo1; } //accumulate方法:可以在同一个key下累积值，若key对应的value有值，则以数组形式累积；否则相当于put方法public JSONObject testAccumulate(){ JSONObject jo2=new JSONObject(); jo2.put("a", "1"); jo2.put("b", "2"); jo2.put("c", "3"); jo2.accumulate("c", "300"); Transport bike=new Transport("bike",200); jo2.accumulate("c", bike); List list=new ArrayList(); list.add("one"); list.add("two"); list.add("three"); jo2.accumulate("c", list); jo2.put("d", "4"); return jo2; } //与put方法基本一致public JSONObject testElement(){ JSONObject jo3=new JSONObject(); jo3.put("a", "1"); jo3.put("b", "2"); jo3.put("c", "3"); jo3.element("c", "300"); return jo3; } public static void main(String[] args) {// TODO Auto-generated method stubMethodTest test=new MethodTest(); System.out.println("JSONObject的put方法使用"+test.testPut()); System.out.println("JSONObject的accumulate方法使用"+test.testAccumulate()); System.out.println("JSONObject的element方法使用"+test.testElement()); }} ①put方法输出json字符串格式化结果为：{"a": "100","b": "2","c": "3","d": {"name": "bike","price": 200},"e": ["one","two","three"]} ②accumulate方法输出json字符串格式化结果为：{"a": "1","b": "2","c": ["3","300", {"name": "bike","price": 200}, ["one","two","three"] ],"d": "4"} ③element方法输出json字符串格式化结果为：{"a": "1","b": "2","c": "300"} B、JSONArray的使用（1）基本使用：
package com.snnu.json;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class demo_JsonArray { public JSONObject testJsonArray(){ JSONObject ob=new JSONObject(); JSONArray ja=new JSONArray(); ja.add("1"); ja.add("2"); ja.add("3"); ja.add("4"); ja.add("5"); ob.put("array", ja); return ob; } public static void main(String[] args) {// TODO Auto-generated method stubdemo_JsonArray djs=new demo_JsonArray(); System.out.println("JSONArray的使用："+djs.testJsonArray()); }}对输出后的字符串进行格式化：{"array": ["1","2","3","4","5"]}C、综合实例package com.snnu.json;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class demo_testJson { public JSONObject test(){ JSONObject jo=new JSONObject(); jo.put("name", "张三"); jo.put("sex","f"); jo.put("age",21); Transport bike=new Transport("bike",250); jo.put("extra", bike); Transport car=new Transport("car",10000); jo.accumulate("extra", car); Transport motor=new Transport("motor",3000); jo.accumulate("extra", motor); System.out.println(jo); //根据key值（为extra）取对应的valueString value=jo.getString("extra"); System.out.println(value); //将字符串转化为JSONArrayJSONArray jsar=JSONArray.fromObject(value); String str_2=String.valueOf(jsar.get(1)); System.out.println(str_2); //将字符串转化为JSONObjectJSONObject jsob=JSONObject.fromObject(str_2); System.out.println("名称："+jsob.getString("name")); System.out.println("价钱："+jsob.getString("price")); System.out.println("-------------------------------分界线-------------------------------------------"); return jo; }public static void main(String[] args) {// TODO Auto-generated method stubdemo_testJson dtj=new demo_testJson(); System.out.println("综合测试："+dtj.test()); }}输出结果为：{"name":"张三","sex":"f","age":21,"extra":[{"name":"bike","price":250},{"name":"car","price":10000},{"name":"motor","price":3000}]}[{"name":"bike","price":250},{"name":"car","price":10000},{"name":"motor","price":3000}]{"name":"car","price":10000}名称：car价钱：10000-------------------------------分界线-------------------------------------------综合测试：{"name":"张三","sex":"f","age":21,"extra":[{"name":"bike","price":250},{"name":"car","price":10000},{"name":"motor","price":3000}]}
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