解决json字符串序列化后的顺序问题

 @Test
 @SuppressWarnings("unchecked")
 public void facilitySoftwareQueryByPageExample() throws Exception {
  facilitySoftwareRepository.deleteAll();
  FacilitySoftwareConfig facilitySoftware = createFacilitySoftware();
  facilitySoftwareRepository.save(facilitySoftware);
  String userId = "1";
  int pageNumber = 1;
  int pageSize = 5;
  String facilities = objectMapper.writeValueAsString(facilitySoftware);
  LinkedHashMap<String, Object> jsonMap = JSON.parseObject(facilities,LinkedHashMap.class, Feature.OrderedField);
  JSONArray jsonArray = new JSONArray();
  JSONObject jsonObject = new JSONObject(true);
  jsonObject.putAll(jsonMap);
  jsonArray.add(jsonObject);
  this.mockMvc
   .perform(get("/v1/facilitysoftware/userid/" + userId + "/page/" + pageNumber
     + "/pagesize/" + pageSize + ""))
   .andExpect(status().isOk()).andExpect(jsonPath("content",is(jsonArray)))
   .andExpect(jsonPath("totalPages", is(1)))
   .andExpect(jsonPath("totalElements", is(1)))
   .andExpect(jsonPath("last", is(true)))
   .andExpect(jsonPath("number", is(0)))
   .andExpect(jsonPath("size", is(5)))
   .andExpect(jsonPath("numberOfElements", is(1)))
   .andExpect(jsonPath("first", is(true)))
   .andDo(document("facilitySoftware-query-example"));
 }

.andExpect(status().isOk()).andExpect(jsonPath("content",is(jsonArray)))

JSONObject jsonObject = new JSONObject(true);

LinkedHashMap<String, Object> jsonMap = JSON.parseObject(facilities,LinkedHashMap.class, Feature.OrderedField);

JSONArray jsonArray = new JSONArray();
  JSONObject jsonObject = new JSONObject(true);
  jsonObject.putAll(jsonMap);
  jsonArray.add(jsonObject);

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.PropertyFilter;
import com.alibaba.fastjson.serializer.SerializerFeature;
//创建学生对象
Student student = new Student();
student.setName("小明");
student.setSex(1);
student.setAge(18);
//序列化 json key按字典排序
System.out.println(JSONObject.toJSONString(student ,SerializerFeature.MapSortField));
//过滤不要的key age
 System.out.println(JSONObject.toJSONString(student , new PropertyFilter() {
   public boolean apply(Object source, String name, Object value) {
    if ("age".equals(name)) {
     return false;
    }
    return true;
   }
  }, SerializerFeature.MapSortField));

//学生类
import com.alibaba.fastjson.annotation.JSONField;
public class Student {
 private String name;
 private Integer sex;
 private Integer age;
 @JSONField(name = "Name") //用于序列化成json，key Name
 public String getName() {
  return name;
 }
 @JSONField(name = "Name") 用于json(Name)反序列化成学生对象
 public void setName(String name) {
  this.name = name;
 }
 public Integer getSex() {
  return sex;
 }
 public void setSex(Integer sex) {
  this.sex = sex;
 }
 public Integer getAge() {
  return age;
 }
 public void setAge(Integer age) {
  this.age = age;
 }
}

 //学生类
import com.fasterxml.jackson.annotation.JsonProperty;
public class Student {
 @JsonProperty("Name")
 private String name;
 private Integer sex;
 private Integer age;
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public Integer getSex() {
  return sex;
 }
 public void setSex(Integer sex) {
  this.sex = sex;
 }
 public Integer getAge() {
  return age;
 }
 public void setAge(Integer age) {
  this.age = age;
 }
}
//自己测试下
import com.fasterxml.jackson.databind.ObjectMapper;
import org.junit.Test;
@Test
public void test() throws Exception{
 Student student = new Student();
 student.setName("小明");
 ObjectMapper MAPPER = new ObjectMapper();
 //jackson序列化
 String json = MAPPER.writeValueAsString(student);
 System.out.println(json);
 //jackson反序列化
 Student student2 = MAPPER.readValue(json, Student.class);
 System.out.println(student2.getName());
}

//在学生类上加上这个
方式一：（已经过时的方法）
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
方式二：
import com.fasterxml.jackson.annotation.JsonInclude;
@JsonInclude(JsonInclude.Include.NON_NULL)

import com.fasterxml.jackson.databind.DeserializationFeature;
MAPPER.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

方式一：
@JsonIgnoreProperties：该注解将在类曾级别上使用以忽略json属性。在下面的栗子中，我们将从albums的dataset中忽略“tag”属性；
@JsonIgnoreProperties({ "tags" })
方式二：
@JsonIgnore：该注释将在属性级别上使用以忽略特定属性；get方法上
@JsonIgnore 

@JsonAlias("Name")  反序列化时生效
private String name;
@JsonProperty("Name") 反序列化和序列化都时生效
private String name;