一、创建demo用到的实体类
public class UmsPermission implements Serializable {
private Long id;
@ApiModelProperty(value = "父级权限id")
private Long pid;
@ApiModelProperty(value = "名称")
private String name;
@ApiModelProperty(value = "权限值")
private String value;
@ApiModelProperty(value = "图标")
private String icon;
@ApiModelProperty(value = "权限类型:0->目录;1->菜单;2->按钮(接口绑定权限)")
private Integer type;
@ApiModelProperty(value = "前端资源路径")
private String uri;
@ApiModelProperty(value = "启用状态;0->禁用;1->启用")
private Integer status;
@ApiModelProperty(value = "创建时间")
private Date createTime;
@ApiModelProperty(value = "排序")
private Integer sort;
private static final long serialVersionUID = 1L;
}
二、maven地址(需要用到的jar包)
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.31</version>
</dependency>
三、转换需要用到的包路径
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import net.sf.json.JSONArray;
import org.apache.commons.beanutils.BeanMap;
import org.apache.commons.beanutils.BeanUtils;
import java.util.stream.Collectors;
四、JSON字符串转对象
UmsPermission umsPermission = JSON.parseObject(jsonStr, UmsPermission.class);
五、JSON字符串转MAP
Map class Map<String,Object> map = JSON.parseObject(jsonStr, Map.class);
六、JSON字符串转JSONObject
JSONObject class JSONObject jsonObject = JSON.parseObject(jsonStr, JSONObject.class);
七、JSON字符串转List
//listJson 是ListJSON字符串 [{"id":"1","name":"张三"},{"id":"2","name":"李四"}]
List<UmsPermission> studentList = JSON.parseArray(listJson, UmsPermission.class);
八、对象转JSON字符串
UmsPermission umsPermission = new UmsPermission()
String jsonStr= JSONObject.toJSONString(umsPermission)
// 返回jsonStr格式 {"id":"1","name":"张三"}
九、对象转Map
BeanMap testMap = new BeanMap(Object bean);
Map<String,Object> testMap = new BeanMap(Object bean);
UmsPermission umsPermission = new UmsPermission();
Map<String,Object> testMap = new BeanMap(umsPermission);
十、对象转JSonObject
UmsPermission umsPermission = new UmsPermission();
JSONObject jsonStu = (JSONObject)JSONObject.toJSON(umsPermission);
十一、Map转Json字符串
Map Map = new HashMap<>();
String jsonStr= JSONObject.toJSONString(Map);
十二、Map转JsonObject
Map<String,Object> map = new HashMap<>();
JSONObject jsonStu = (JSONObject)JSONObject.toJSON(map);
十三、Map转对象
Map<String,Object> testMap = new HashMap<>();
UmsPermission umsPermission2 = new UmsPermission();
BeanUtils.populate(umsPermission2,testMap);
十四、List转Json字符串
//list 对象
List<UmsPermission> list = new ArrayList<UmsPermission>()
String listJson = JSONObject.toJSONString(list)
//list map
List<Map> list = new ArrayList<Map>()
String listJson = JSONObject.toJSONString(list)
十五、List转JsonArray
List<UmsPermission> list = new ArrayList()
//2、使用JSONArray JSONArray array = JSONArray.fromObject(list)
十六、JsonObject转Json字符串
JSONObject jsonObject = new JSONObject();
String string = jsonObject.toJSONString();
十七、JsonObject转对象
UmsPermission umsPermission= JSON.toJavaObject(json, UmsPermission.class)
十八、JsonObject转Map
JSONObject json = new JSONObject();
Map map = JSON.toJavaObject(json, Map.class);
十九、JsonObject转List
JSONArray array = new JSONArray();
List<Map<String,Object> list = JSONArray.toList(array, Map.class);
二十、JsonArray转Json字符串
JSONArray array = new JSONArray();
array.toString()