案发现场描述

同事调试程序，mybatis embed 嵌套查询，使用 json 转字符串，前端收到的数据带有 $ref ，导致无法按照正常逻辑解析。

解决方式，google啦

汗颜，作为老程序员了，还是祭出终极大招，Google 搜搜。
出现 $ref 原因是，待序列化的对象中存在相同的，json 使用 ref 表示引用之前的。
解决办法，禁止使用ref即可：SerializerFeature.DisableCircularReferenceDetect

代码例子

  1. static class Demo {
  2.     private Integer id;
  3.     private String name;
  4.     private String telephone;
  6.     public Demo() {
  7.     }
  9.     public Demo(Integer id, String name, String telephone) {
  10.         this.id = id;
  11.         this.name = name;
  12.         this.telephone = telephone;
  13.     }
  15.     public Integer getId() {
  16.         return id;
  17.     }
  19.     public void setId(Integer id) {
  20.         this.id = id;
  21.     }
  23.     public String getName() {
  24.         return name;
  25.     }
  27.     public void setName(String name) {
  28.         this.name = name;
  29.     }
  31.     public String getTelephone() {
  32.         return telephone;
  33.     }
  35.     public void setTelephone(String telephone) {
  36.         this.telephone = telephone;
  37.     }
  38. }
  40. @Test
  41. public void testJsonRef() {
  42.     ArrayList<Demo> demos = new ArrayList<>();
  43.     // 给 demos 添加相同元素，ref 出现
  44.     Demo demo = new Demo(1, "小辉", "18888888888");
  45.     for (int i = 0; i < 5; i++) {
  46.         demos.add(demo);
  47.     }
  48.     System.out.println("输出带有 ref 的json串（给 demos 添加相同元素，ref 出现）");
  49.     System.out.println(JSON.toJSONString(demos, true));
  50.     System.out.println("处理带有 ref 的json串，然后输出（给 demos 添加相同元素，ref 出现）");
  51.     System.out.println(JSON.toJSONString(demos, SerializerFeature.PrettyFormat,
  52.             SerializerFeature.DisableCircularReferenceDetect));
  53.     // 给 demos 添加不同元素，不会出现 ref
  54.     demos = new ArrayList<>();
  55.     for (int i = 0; i < 5; i++) {
  56.         demos.add(new Demo(1, "小辉", "18888888888"));
  57.     }
  58.     System.out.println("给 demos 添加不同元素，不会出现 ref");
  59.     System.out.println(JSON.toJSONString(demos, true));
  60. }

代码运行结果

  1. 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\devServer\mvnRep\commons-logging\commons-logging\1.0.4\commons-logging-1.0.4.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.hbte.sharp.TestDemo,testJsonRef
  3. 输出带有 ref 的json串（给 demos 添加相同元素，ref 出现）
  4. [
  5.     {
  6.         "id":1,
  7.         "name":"小辉",
  8.         "telephone":"18888888888"
  9.     },
  10.     {"$ref":"$[0]"},
  11.     {"$ref":"$[0]"},
  12.     {"$ref":"$[0]"},
  13.     {"$ref":"$[0]"}
  14. ]
  15. 处理带有 ref 的json串，然后输出（给 demos 添加相同元素，ref 出现）
  16. [
  17.     {
  18.         "id":1,
  19.         "name":"小辉",
  20.         "telephone":"18888888888"
  21.     },
  22.     {
  23.         "id":1,
  24.         "name":"小辉",
  25.         "telephone":"18888888888"
  26.     },
  27.     {
  28.         "id":1,
  29.         "name":"小辉",
  30.         "telephone":"18888888888"
  31.     },
  32.     {
  33.         "id":1,
  34.         "name":"小辉",
  35.         "telephone":"18888888888"
  36.     },
  37.     {
  38.         "id":1,
  39.         "name":"小辉",
  40.         "telephone":"18888888888"
  41.     }
  42. ]
  43. 给 demos 添加不同元素，不会出现 ref
  44. [
  45.     {
  46.         "id":1,
  47.         "name":"小辉",
  48.         "telephone":"18888888888"
  49.     },
  50.     {
  51.         "id":1,
  52.         "name":"小辉",
  53.         "telephone":"18888888888"
  54.     },
  55.     {
  56.         "id":1,
  57.         "name":"小辉",
  58.         "telephone":"18888888888"
  59.     },
  60.     {
  61.         "id":1,
  62.         "name":"小辉",
  63.         "telephone":"18888888888"
  64.     },
  65.     {
  66.         "id":1,
  67.         "name":"小辉",
  68.         "telephone":"18888888888"
  69.     }
  70. ]
  73. Process finished with exit code 0

小结

只是代码的搬运工，用用而已，可叹，可怜。