JSONArray类将JavaBean,List,Map转换成json字符串

小咪咪 2022-06-07 23:25 251阅读 0赞

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package cn.itcast.javaee.lucene.bean2json;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import org.junit.Test;
    
    import net.sf.json.JSONArray;
    
    /**
     * 第三方工具类，将JavaBean,List,Map转换成JSON文本
     * @author xuhaixing
     *
     */
    public class TestJson {
    	
    	@Test
    	public void javabean2json(){
    		User user = new User(1, "哈哈", 7000);
    		JSONArray jsonArray = JSONArray.fromObject(user);
    		String jsonJAVA = jsonArray.toString();
    		System.out.println(jsonJAVA);
    		//[{"id":1,"name":"哈哈","sal":7000}]
    	}
    	@Test
    	public void list2json(){
    		List<User> userList = new ArrayList<User>();
    		userList.add(new User(1, "张三", 1000));
    		userList.add(new User(2, "李四", 2000));
    		userList.add(new User(3, "王五", 3000));
    		JSONArray jsonArray = JSONArray.fromObject(userList);
    		String jsonJAVA = jsonArray.toString();
    		System.out.println(jsonJAVA);
    		//[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"李四","sal":2000},{"id":3,"name":"王五","sal":3000}]
    		
    	}
    	@Test
    	public void map2json(){
    		List<User> userList = new ArrayList<User>();
    		userList.add(new User(1, "张三", 1000));
    		userList.add(new User(2, "张三老婆", 2000));
    		userList.add(new User(3, "张三孩子", 3000));
    		Map<String, Object> map = new HashMap<String, Object>();
    		map.put("total", userList.size());
    		map.put("rows", userList);
    		
    		JSONArray jsonArray = JSONArray.fromObject(map);
    		String jsonJAVA = jsonArray.toString();
    		System.out.println(jsonJAVA);
    		//[{"total":3,"rows":[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"张三老婆","sal":2000},{"id":3,"name":"张三孩子","sal":3000}]}]
    		jsonJAVA = jsonJAVA.substring(1, jsonJAVA.length()-1);
    		System.out.println(jsonJAVA);
    		//{"total":3,"rows":[{"id":1,"name":"张三","sal":1000},{"id":2,"name":"张三老婆","sal":2000},{"id":3,"name":"张三孩子","sal":3000}]}
    	}
    	
    }

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