我该如何转换它：

"parameters" : [ "{name:\"xx\", value:\"45\",typRef:\"FE\",unit:\"grad\"}" ],

改为：

"parameters" : [ {
        "name" : "xx",
        "value" : "45",
        "typRef" : "FE",      
        "unit" : "grad"
        }]

我使用objectMapper来写字符串

public class ParameterClass 
   {
      @NonNull private final String name;
      @JsonInclude(JsonInclude.Include.NON_NULL) private final String value;
      @JsonInclude(JsonInclude.Include.NON_NULL) private final typRef;
      @JsonInclude(JsonInclude.Include.NON_NULL) private final String unit;

      private ParameterClass (@NonNull String name, String value, String typRef, String unit)
      {
         this.name = name;
         this.value = value;
         this.typRef = typRef;
         this.unit = unit;
      }

构建JSON的方法

buildAsJson(String name, String unit, ...) {
ParameterClass parameter = new ParameterClass(name, unit, ..);
return objectMapper.writeValueAsString(parameter);
}

我把所有的都列在一个清单上：

List<String> parameters = List.of(buildAsJson("xx", "45", ...), buildAsJson(...))