Java Bean、Json、Map和List互轉方式彙總

這裏只彙總用現有工具類實現的方式，方便以後查看，當然可能不是很完整，後續有知道的會添加進來

Bean轉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轉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轉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轉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字符串轉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轉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

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);

Json字符串轉Map

與上面的Json字符串轉Bean方法一樣，只不過將Bean.class換成Map.class

json轉list對象

@Data
public class AdapterParam {

    private String name;

    private String description;
}

• fastJson

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

• hutool

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

• Jackson

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

List對象轉Json字符串

跟上面的Bean轉Json以及Map轉Json方法一樣。