java - 如何在 java 中将列表 转换为 Json 字符串 (com.amazonaws.util.json.JSONObject)

Question

com.amazonaws.util.json.JSONObject下面是列表，我想将它转换成json字符串。

List<JSONObject> jsonObjlist是

[{"Attribute":"EmailAddress","Value":"abc@yahoo.com"}, {"Attribute":"Source","Value":"Missing_Fixed"}, {"Attribute":"mx_Lead_Status","Value":"Registered User"}, {"Attribute":"mx_Age","Value":""}, {"Attribute":"mx_LoginID","Value":"abc@yahoo.com"}, {"Attribute":"mx_Registration_Source","Value":"EMAIL"}]

ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
        objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
        String arrayToJson = objectMapper.writeValueAsString(jsonObjlist);

我得到的输出是

[{"map":{"Attribute":"EmailAddress","Value":"abc@yahoo.com"}},{"map":{"Attribute":"Source","Value":"Missing_Fixed"}},{"map":{"Attribute":"mx_Lead_Status","Value":"Registered User"}},{"map":{"Attribute":"mx_Age","Value":""}},{"map":{"Attribute":"mx_LoginID","Value":"abc@yahoo.com"}},{"map":{"Attribute":"mx_Registration_Source","Value":"EMAIL"}}]

期望的输出是

"[{"Attribute":"EmailAddress","Value":"abc@yahoo.com"}, {"Attribute":"Source","Value":"Missing_Fixed"}, {"Attribute":"mx_Lead_Status","Value":"Registered User"}, {"Attribute":"mx_Age","Value":""}, {"Attribute":"mx_LoginID","Value":"abc@yahoo.com"}, {"Attribute":"mx_Registration_Source","Value":"EMAIL"}]"

Answer 1

您应该将列表转换为 JSON 数组，然后使用其 toString() 函数:

JSONArray myArray = new JSONArray(jsonObjlist);

// ...
String arrayToJson = myArray.toString(2);

int 参数指定用于格式化的缩进因子。