javaBean转为json

最新推荐文章于 2025-06-25 13:11:22 发布

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本文提供了一个Java示例程序，展示如何使用json-lib库将JavaBean对象、对象列表及Map集合转换为JSON格式字符串。示例包括单个JavaBean、JavaBean列表、带有JavaBean列表的对象以及Map集合的转换。

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1、导入jar包

commons-beanutils-1.7.0.jar
commons-collections-3.1.jar
commons-lang-2.5.jar
commons-logging-1.1.1.jar
ezmorph-1.0.3.jar
json-lib-2.1-jdk15.jar

2、使用工具将javabean转为json

public class Bean2Json {

    private static void javaBean2json(){
        Admin admin = new Admin("张三", 30);
        JSONArray jsonArray = JSONArray.fromObject(admin);
        String json = jsonArray.toString();
        System.out.println(json);
    }

    private static void list2json(){
        List<Admin> adminList = new ArrayList<Admin>();
        adminList.add(new Admin("张三", 20));
        adminList.add(new Admin("李四", 30));

        JSONArray jsonArray = JSONArray.fromObject(adminList);
        String json = jsonArray.toString();
        System.out.println(json);
    }

    private static void beanlist2json(){
        List<Admin> adminList = new ArrayList<Admin>();
        adminList.add(new Admin("张三", 20));
        adminList.add(new Admin("李四", 30));

        Province pro = new Province("西安", 1, adminList);

        JSONArray jsonArray = JSONArray.fromObject(pro);
        String json = jsonArray.toString();
        System.out.println(json);
    }

    private static void map2json(){
        Map<String,String> map = new HashMap<String, String>();
        map.put("key", "value");
        map.put("张安", "张");

        JSONArray jsonArray = JSONArray.fromObject(map);
        String json = jsonArray.toString();
        System.out.println(json);
    }

    public static void main(String[] args) {
        javaBean2json();
        list2json();
        beanlist2json();
        map2json();
    }
}

转换结果如下

[{"name":"张三","age":30}]
[{"name":"张三","age":20},{"name":"李四","age":30}]
[{"name":"西安","id":1,"list":[{"name":"张三","age":20},{"name":"李四","age":30}]}]
[{"张安":"张","key":"value"}]