JSON（2）_JSON 在 java 代码中的处理

本系列博客汇总在这里：JSON 汇总

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一、关于 json-lib？

JSON-lib 是一个 java 类库。用于转换 javabeans, maps, collections, java arrays 和 XML 成为 json 格式数据 ；以及转换 json 格式数据成为 javabeans 对象。

需要 jar 包

• jakarta commons-lang 2.5
• jakarta commons-beanutils 1.8.0
• jakarta commons-collections 3.2.1
• jakarta commons-logging 1.1.1
• ezmorph 1.0.6
  
  

二、将 JavaBean/Map 解析成 JSON 串

package cn.wyx.json;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import cn.wyx.model.Person;
import net.sf.json.JSONObject;
public class Demo1
{
	public static void main(String[] args)
	{
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("name", "魏宇轩1");
		map.put("age", 12);
		map.put("address", "昆明");
		Person p = new Person("魏宇轩2", 28, new Date(), "北京");
		map.put("person", p);
		
		//把map转换成json对象
		JSONObject obj = JSONObject.fromObject(map);
		//把json对象转换成字符串
		String result = obj.toString();
		System.out.println(result);
	}
}

三、将 Array 和集合解析成 json 串

package cn.wyx.json;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import net.sf.json.JSONArray;
import cn.wyx.model.Person;
public class Demo3
{
	public static void main(String[] args)
	{
		Person p = new Person("魏宇轩1", 28, new Date(), "昆明");
		// String[] names = {"刘备", "关羽", "张飞"};
		// Object [] objs = {p, "诸葛亮", 23};
		List list = new ArrayList();
		list.add(p);
		list.add("魏宇轩");
		list.add(53);
		JSONArray obj = JSONArray.fromObject(list);
		String result = obj.toString();
		System.out.println(result);
	}
}

四、使用 JsonConfig 过虑属性

package cn.wyx.json;
import java.util.Date;

import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import cn.wyx.model.Person;
public class Demo2
{
	public static void main(String[] args)
	{
		Person p = new Person("魏宇轩", 18, new Date(), "昆明");
		JsonConfig jc = new JsonConfig(); 
		//在指定转换时不包含哪些属性
		String[] attrs ={"birthday"}; 
		jc.setExcludes(attrs);
		//把map转换成json对象
		JSONObject obj = JSONObject.fromObject(p,jc);
		// 把json对象转换成字符串
		String result = obj.toString();
		System.out.println(result);
	}
}

五、将 json 串转成 JavaBean/Map

package cn.wyx.json;
import java.util.Map;
import net.sf.json.JSONObject;
import cn.wyx.model.Person;
public class Demo4
{
	public static void main(String[] args)
	{
		String str = "{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":14,\"month\":9,\"seconds\":11,\"time\":1475914451915,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩\"}";
		/*
		 * //创建jsonConfig JsonConfig jc = new JsonConfig(); //设置要转换的类
		 * jc.setRootClass(Person.class);
		 */
		JSONObject obj = JSONObject.fromObject(str);
		Person p = (Person) JSONObject.toBean(obj, Person.class);
		System.out.println(p);
		System.out.println("---------------------------------");
		Map m = (Map) JSONObject.toBean(obj, Map.class);
		System.out.println(m);
	}
}

六、将字符串转换成集合

package cn.wyx.json;
import java.util.List;
import net.sf.json.JSONArray;
import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;
import cn.wyx.model.Person;
public class Demo5
{
	public static void main(String[] args)
	{
		/*
		 * List<Person> pList = new ArrayList<Person>(); 
		 * for(int i = 0; i < 5;i++)
		 * { 
		 * 	Person p = new Person(\"魏宇轩\"+i,28, new Date(), \"昆明\");
		 * 	pList.add(p); 
		 * }
		 * JSONArray ja = JSONArray.fromObject(pList); 
		 * String result =ja.toString(); 
		 * System.out.println(result);
		 */

		String str = "[{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":24,\"month\":9,\"seconds\":34,\"time\":1475915074368,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩0\"},{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":24,\"month\":9,\"seconds\":34,\"time\":1475915074368,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩1\"},{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":24,\"month\":9,\"seconds\":34,\"time\":1475915074368,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩2\"},{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":24,\"month\":9,\"seconds\":34,\"time\":1475915074368,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩3\"},{\"address\":\"昆明\",\"age\":28,\"birthday\":{\"date\":8,\"day\":6,\"hours\":16,\"minutes\":24,\"month\":9,\"seconds\":34,\"time\":1475915074368,\"timezoneOffset\":-480,\"year\":116},\"name\":\"魏宇轩4\"}]";
		JSONArray ja = JSONArray.fromObject(str);
		// 创建json配置对象
		JsonConfig jc = new JsonConfig();
		// 设置json的要转换的类
		jc.setRootClass(Person.class);
		List<Person> pList = (List<Person>) JSONSerializer.toJava(ja, jc);
		/*
		 * for(int i = 0; i < pList.size(); i++)
		 * { 
		 * 	Person person = pList.get(i);
		 * 	System.out.println(person); 
		 * }
		 */
		for (Person p : pList)
		{
			System.out.println(p.getName());
		}
		// System.out.println(pList);
	}
}

如有错误，欢迎指正！