tags: JSON

前言

前面我们在使用Strus2的时候，Struts2自带了组件能够让JavaBean对象、集合转成是JSON，不用我们自己拼接...这是非常方便的。但是，我们不一定使用Struts2框架来做开发呀。因此，我们还得学习使用第三方库来将JavaBean对象、集合转成JSON

导入开发包

commons-io-2.0.1.jar
commons-lang-2.5.jar
commons-collections-3.1.jar
commons-beanutils-1.7.0.jar
ezmorph-1.0.3.jar
json-lib-2.1-jdk15.jar

事例代码


package cn.itcast.javaee.js.bean2json;

import net.sf.json.JSONArray;

import java.util.*;

/**
 * 使用第三方工具，将JavaBean对象/List或Set或Map对象转成JSON 
 * @author AdminTC
 */
public class TestBean2Json {
	private static void javabean2json() {
		City city = new City(1,"广州");
		JSONArray jSONArray = JSONArray.fromObject(city);
		String jsonJAVA = jSONArray.toString();
		System.out.println(jsonJAVA);
		//[{"id":1,"name":"广州"}]
	}
	private static void list2json() {
		List<City> cityList = new ArrayList<City>();
		cityList.add(new City(1,"广州"));
		cityList.add(new City(2,"珠海"));
		JSONArray jSONArray = JSONArray.fromObject(cityList);
		String jsonJAVA = jSONArray.toString();
		System.out.println(jsonJAVA);
		//[{"id":1,"name":"广州"},{"id":2,"name":"珠海"}]
	}
	private static void set2json() {
		Set<City> citySet = new LinkedHashSet<City>();
		citySet.add(new City(1,"广州"));
		citySet.add(new City(2,"珠海"));
		JSONArray jSONArray = JSONArray.fromObject(citySet);
		String jsonJAVA = jSONArray.toString();
		System.out.println(jsonJAVA);
		//[{"id":1,"name":"广州"},{"id":2,"name":"珠海"}]
	}
	private static void javabeanlist2json() {
		List<City> cityList = new ArrayList<City>();
		cityList.add(new City(1,"中山"));
		cityList.add(new City(2,"佛山"));
		Province province = new Province(1,"广东",cityList);
		
		JSONArray jSONArray = JSONArray.fromObject(province);
		String jsonJAVA = jSONArray.toString();
		System.out.println(jsonJAVA);
		/*
		  [
			 {
			  "id":1,
			  "name":"广东"
			  "cityList":[{"id":1,"name":"中山"},{"id":2,"name":"佛山"}],
		     }
		  ]
		  */
	}
	private static void map2json() {
		
		List<City> cityList = new ArrayList<City>();
		cityList.add(new City(1,"中山"));
		cityList.add(new City(2,"佛山"));
		
		Map<String,Object> map = new LinkedHashMap<String,Object>();
		map.put("total",cityList.size());//表示集合的长度
		map.put("rows",cityList);//rows表示集合
		
		JSONArray jSONArray = JSONArray.fromObject(map);
		String jsonJAVA = jSONArray.toString();
		System.out.println(jsonJAVA);
		//[{"total":2,"rows":[{"id":1,"name":"中山"},{"id":2,"name":"佛山"}]}]
		
		jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1);
		System.out.println(jsonJAVA);
	}
	
}

#总结#

把要解析成JSON 的javaBena对象、集合放进下面这段代码即可！

		JSONArray jSONArray = JSONArray.fromObject(map);

无论放进去什么，返回的都是数组

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第三方库将Bean转成JSON

前言

导入开发包

事例代码