Java Bean、Json、Map和List互转方式汇总

叁歲伎倆 2023-05-30 08:52 13阅读 0赞

> **这里只汇总用现有工具类实现的方式，方便以后查看，当然可能不是很完整，后续有知道的会添加进来**

## Bean转Bean ##

*  Spring

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Bean2 bean2 = new Bean2();
    BeanUtils.copyProperties(bean, bean2);
    System.out.println(bean2);

*  hutool工具包

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Bean2 bean2 = new Bean2();
    BeanUtil.copyProperties(bean, bean2);
    System.out.println(bean2);

## Bean转Map ##

*  org.apache.commons.beanutils

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Map<String, String> map = BeanUtils.describe(bean);
    System.out.println(map);

*  hutool工具包

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Map<String, Object> map = BeanUtil.beanToMap(bean);
    System.out.println(map);

*  org.apache.commons.beanutils

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    BeanMap beanMap = new BeanMap(bean);
    System.out.println(beanMap);

*  Jackson

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Map map = new ObjectMapper().convertValue(bean, Map.class);
    System.out.println(map);

*  json-lib

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Map map = (Map) JSONObject.toBean(JSONObject.fromObject(bean), Map.class);
    System.out.println(map);

## Map转Bean ##

*  org.apache.commons.beanutils

Bean bean = new Bean();
    Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    BeanUtils.populate(bean, map);
    System.out.println(bean);

*  hutool

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    Bean bean = BeanUtil.toBean(map, Bean.class);
    System.out.println(bean);

*  Jackson

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    Bean bean = new ObjectMapper().convertValue(map, Bean.class);
    System.out.println(bean);

*  json-lib

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    Bean bean = (Bean) JSONObject.toBean(JSONObject.fromObject(map), Bean.class);
    System.out.println(bean);

## Bean转Json字符串 ##

*  fastJson

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    String json = JSONObject.toJSONString(bean);
    System.out.println(json);

*  hutool

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    String json = JSONUtil.toJsonStr(bean);
    System.out.println(json);

*  Jackson

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    String json = new ObjectMapper().writeValueAsString(bean);
    System.out.println(json);

*  gson

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    Gson gson = new GsonBuilder().create();
    String json = gson.toJson(bean);
    System.out.println(json);

*  json-lib

Bean bean = new Bean();
    bean.setId("123");
    bean.setName("huang");
    bean.setAge(25);
    String json = JSONObject.fromObject(bean).toString();
    System.out.println(json);

## Json字符串转Bean ##

*  Jackson

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Bean bean = new ObjectMapper().readValue(json, Bean.class);
    System.out.println(bean);

*  JsonPath

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Bean bean = JsonPath.parse(json).read("$", Bean.class);
    System.out.println(bean);

*  fastJson

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Bean bean = JSON.parseObject(json, Bean.class);
    System.out.println(bean);

*  gson

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Gson gson = new GsonBuilder().create();
    Bean bean = gson.fromJson(json, Bean.class);
    System.out.println(bean);

*  hutool

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Bean bean = JSONUtil.toBean(json, Bean.class);
    System.out.println(bean);

*  json-lib

String json = "{\"name\":\"huang\",\"id\":\"1234\",\"age\":25}";
    Bean bean = (Bean) JSONObject.toBean(JSONObject.fromObject(json), Bean.class);
    System.out.println(bean);

## Map转Json字符串 ##

*  fastJson

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    String json = JSONObject.toJSONString(map);
    System.out.println(json);

*  hutool

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    String json = JSONUtil.toJsonStr(map);
    System.out.println(json);

*  Jackson

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    String json = new ObjectMapper().writeValueAsString(map);
    System.out.println(json);

*  gson

Map<String, Object> map = new HashMap<>(3);
    map.put("id","123");
    map.put("name", "huang");
    map.put("age", 25);
    Gson gson = new GsonBuilder().create();
    String json = gson.toJson(map);
    System.out.println(json);

*  json-lib

Map<String, Object> map = new HashMap<>(3);
    map.put("id", "123");
    map.put("name", "huang");
    map.put("age", 25);
    String json = JSONObject.fromObject(map).toString();
    System.out.println(json);

*  net.minidev.json

## Json字符串转Map ##

与上面的Json字符串转Bean方法一样，只不过将Bean.class换成Map.class

## json转list对象 ##

@Data
    public class AdapterParam { 
    
        private String name;
    
        private String description;
    }

*  fastJson

String json = "[{\"name\":\"p1\",\"description\":\"参数1\"},{\"name\":\"p2\",\"description\":\"参数2\"}]";
    List<AdapterParam> list = JSONObject.parseArray(json, AdapterParam.class);
    System.out.println(list);

*  hutool

String json = "[{\"name\":\"p1\",\"description\":\"参数1\"},{\"name\":\"p2\",\"description\":\"参数2\"}]";
    List<AdapterParam> list = JSONUtil.toList(JSONUtil.parseArray(json), AdapterParam.class);
    System.out.println(list);

*  Jackson

String json = "[{\"name\":\"p1\",\"description\":\"参数1\"},{\"name\":\"p2\",\"description\":\"参数2\"}]";
    TypeReference<List<AdapterParam>> typeReference = new TypeReference<List<AdapterParam>>() { };
    List<AdapterParam> list = new ObjectMapper().readValue(json, typeReference);
    System.out.println(list);

*  gson

String json = "[{\"name\":\"p1\",\"description\":\"参数1\"},{\"name\":\"p2\",\"description\":\"参数2\"}]";
    Gson gson = new Gson();
    List<AdapterParam> list = gson.fromJson(json, new TypeToken<List<AdapterParam>>() { }.getType());
    System.out.println(list);

## List对象转Json字符串 ##

跟上面的Bean转Json以及Map转Json方法一样。