如何避免 GSON JsonObject 中的反斜杠？

Question

我有一个 Java POJOpublic class TagBean {  private String type;  private String id;  public TagBean(String type, String id) {    this.type = type;    this.id = id;         }    // getters    // setters   }我正在构建 pojo 并将它们添加到列表中，作为....List<TagBean> channelsList = new ArrayList<>();List<TagBean> showsList = new ArrayList<>();for each <business logic> {   if value=channels {      channelsList.add(new TagBean(...));   }   if value=shows {      showsList.add(new TagBean(...));   }}Gson gson = new GsonBuilder().create();JsonObject tjsonObject = new JsonObject();tjsonObject.addProperty("channels", gson.toJson(channelsList));tjsonObject.addProperty("shows", gson.toJson(showsList));JsonObject mainjsonObject = mainjsonObject.add("tags", tjsonObject);return mainjsonObject;我的输出是：{"tags": {    "channels": "[{\"type\":\"channel\",\"id\":\"channel\",\"name\":\"Channel\",\"parent\":\"SXM\"}]",    "shows": "[{\"type\":\"shows\",\"id\":\"shows\",\"name\":\"Shows\",\"parent\":\"SXM\"},{\"type\":\"shows\",\"id\":\"howard\",\"name\":\"Howard Stern\",\"parent\":\"shows\"},{\"type\":\"shows\",\"id\":\"howardstern\",\"name\":\"Howard Stern\",\"parent\":\"howard\"}]",    "sports": "[]"}}我怎样才能删除反斜杠？所以输出是这样的：{  "tags": {     "channels": " [{"type":"channel","id":"channel","name":"Channel","parent":"SXM"}]",    "shows": "[{"type":"shows","id":"shows","name":"Shows","parent":"SXM"},{"type":"shows","id":"howard","name":"Howard Stern","parent":"shows"}....其他帖子很少，但没有人解释这一点。

Answer 1

问题是由以下原因引起的：

tjsonObject.addProperty("channels", gson.toJson(channelsList));

它所做的是转换channelsList为包含 JSON 列表表示的字符串，然后将该属性设置为该字符串。由于字符串包含 JSON 元字符，当字符串被序列化时它们必须被转义......第二次。

我认为你需要这样做：

tjsonObject.add("channels", gson.toJsonTree(channelsList));

那应该产生这个：

{

  "tags": {

     "channels":     

        [{"type":"channel","id":"channel","name":"Channel","parent":"SXM"}],

     "shows": 

        [{"type":"shows","id":"shows","name":"Shows","parent":"SXM"},

         {"type":"shows","id":"howard","name":"Howard Stern","parent":"shows"}

   ....

这与您的问题要求的略有不同，但它的优点是语法有效 JSON！

Answer 2

String mainJsonStr = mainjsonObject.toString();

    mainJsonStr = mainJsonStr.replace("\\\\", ""); //replace the \

    System.out.println(mainJsonStr);