json-lib包使用总结
??????????????????????????????????????? 使用JSON的方法
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JSON 即 JavaScript Object Natation，它是一种轻量级的数据交换格式，非常适合于服务器与 JavaScript 的交互。本文将快速讲解 JSON 格式，并通过代码示例演示如何分别在客户端和服务器端进行 JSON 格式数据的处理。
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Json必需的包
commons-httpclient-4.1.1jar
commons-lang-2.5.jar
commons-logging-1.1.1.jar
json-lib-2.4-jdk15.jar
ezmorph-1.0.6.jar
commons-collections-3.2.1.jar
commons-beanutils-1.8.3.jar
以上包可以从
http://commons.apache.org/index.html
http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://morph.sourceforge.net/
http://www.docjar.com/
中下载到。
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测试类一：
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import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JSONObjectSample { //创建JSONObject对象 private static JSONObject createJSONObject(){ JSONObject jsonObject = new JSONObject(); jsonObject.put("name", "kevin"); jsonObject.put("Max.score", new Integer(100)); jsonObject.put("Min.score", new Integer(50)); jsonObject.put("nickname", "picglet"); return jsonObject; } public static void main(String[] args) { JSONObject jsonObject = JSONObjectSample.createJSONObject(); //输出jsonobject对象 System.out.println("jsonObject==>"+jsonObject); //判读输出对象的类型 boolean isArray = jsonObject.isArray(); boolean isEmpty = jsonObject.isEmpty(); boolean isNullObject = jsonObject.isNullObject(); System.out.println("isArray:"+isArray+" isEmpty:"+isEmpty+" isNullObject:"+isNullObject); //添加属性 jsonObject.element("address", "swap lake"); System.out.println("添加属性后的对象==>"+jsonObject); //返回一个JSONArray对象 JSONArray jsonArray = new JSONArray(); jsonArray.add(0, "this is a jsonArray value"); jsonArray.add(1,"another jsonArray value"); jsonObject.element("jsonArray", jsonArray); JSONArray array = jsonObject.getJSONArray("jsonArray"); System.out.println("返回一个JSONArray对象："+array); //添加JSONArray后的值 //{"name":"kevin","Max.score":100,"Min.score":50,"nickname":"picglet","address":"swap lake", //"jsonArray":["this is a jsonArray value","another jsonArray value"]} System.out.println(jsonObject); //根据key返回一个字符串 String jsonString = jsonObject.getString("name"); System.out.println("jsonString==>"+jsonString); } } ?测试类二：
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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 Json { public static void main(String[] args) { Json j = new Json(); j.bean2json(); } public void arr2json() { boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray = JSONArray.fromObject(boolArray); System.out.println(jsonArray); // prints [true,false,true] } public void list2json() { List list = new ArrayList(); list.add("first"); list.add("second"); JSONArray jsonArray = JSONArray.fromObject(list); System.out.println(jsonArray); // prints ["first","second"] } public void createJson() { JSONArray jsonArray = JSONArray.fromObject("['json','is','easy']"); System.out.println(jsonArray); // prints ["json","is","easy"] } public void map2json() { Map<String,String> map = HashMap<String,String>() map.put("name", "json"); map.put("bool", Boolean.TRUE); map.put("int", new Integer(1)); map.put("arr", new String[] { "a", "b" }); map.put("func", "function(i){ return this.arr[i]; }"); JSONObject json = JSONObject.fromObject(map); System.out.println(json); // prints // ["name":"json","bool":true,"int":1,"arr":["a","b"],"func":function(i){ // return this.arr[i]; }] } public void bean2json() { JSONObject jsonObject = JSONObject.fromObject(new MyBean()); System.out.println(jsonObject); /* * prints * {"func1":function(i){ return this.options[i]; * },"pojoId":1,"name":"json","func2":function(i){ return * this.options[i]; }} */ } public void json2bean() { String json = "{name="json2",func1:true,pojoId:1,func2:function(a){ return a; },options:['1','2']}"; JSONObject jb = JSONObject.fromString(json); JSONObject.toBean(jb, MyBean.class); System.out.println(); } public void createAJsonObject(){ JSONObject jsonObject = new JSONObject(); jsonObject.element("name", "周星星"); jsonObject.element("sex", "male"); jsonObject.element("age", 18); jsonObject.element("job", "student"); System.out.println(jsonObject.get("name"));// 周星星 System.out.println(jsonObject.get("job"));// student System.out.println(jsonObject.getString("sex"));// male System.out.println(jsonObject.getInt("age"));// 18 String json = "{name:"周星星",sex:"male",age:18,job:"student"}"; JSONObject jsonObject = JSONObject.fromObject(json); //或者使用 JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(json); System.out.println(jsonObject.get("name"));// 周星星 System.out.println(jsonObject.get("job"));// student System.out.println(jsonObject.getString("sex"));// male System.out.println(jsonObject.getInt("age"));// 18 } } ?
?? 操作的bean:
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import net.sf.json.JSONFunction; public class MyBean { private String name = "json"; private int pojoId = 1; // private char[] options = new char[] { 'a', 'f' }; private String func1 = "function(i){ return this.options[i]; }"; private JSONFunction func2 = new JSONFunction(new String[] { "i" }, "return this.options[i];"); // getters & setters ...... }