Java 从 LinkedHashMap 转换为 Json 字符串
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Convert from LinkedHashMap to Json String
提问by user1655510
I'm Workin with Mongo using Jongo, when I do a query I receive a LinkedHashMapas result.
我正在使用 Jongo 与 Mongo 一起工作，当我进行查询时，我收到了一个LinkedHashMap结果。
Iterator one = (Iterator) friends.find(query).projection("{_id:0}").as(Object.class);
while (one.hasNext()) {
LinkedHashMap data = new LinkedHashMap();
data = (LinkedHashMap) one.next();
String content = data.toString();
}
the problem is that if the json is {"user":"something"}content will be {user=something}, it is not a jsonis only toStringmethod from HashMap.
问题是，如果JSON是{"user":"something"}内容将是{user=something}，它不是一个json仅仅是toString从方法HashMap。
How I can get the original JSON?
我怎样才能得到原件JSON？
I don't have a classto map the responseand it isn't a solution create a mapclass, that is why I use a Object.class.
我没有class映射，response也不是创建map类的解决方案，这就是为什么我使用Object.class.
采纳答案by ethanbustad
If you have access to some JSON library, it seems like that's the way to go.
如果您可以访问某些 JSON 库，那似乎就是要走的路。
If using org.json library, use public JSONObject(java.util.Map map):
如果使用 org.json 库，请使用public JSONObject(java.util.Map map)：
String jsonString = new JSONObject(data).toString()
If Gson, use the gson.toJson()method mentioned by @hellboy:
如果是 Gson，使用gson.toJson()@hellboy 提到的方法：
String jsonString = new Gson().toJson(data, Map.class);
回答by hellboy
You can use Gson library from Google to convert any object to JSON. Here is an example to convert LinkedHashMap to json -
您可以使用 Google 的 Gson 库将任何对象转换为 JSON。这是将 LinkedHashMap 转换为 json 的示例 -
Gson gson = new Gson();
String json = gson.toJson(map,LinkedHashMap.class);
回答by user1655510
I resolved the problem using the following code:
我使用以下代码解决了问题：
Iterator one = (Iterator) friends.find(query).projection("{_id:0}").as(Object.class);
while (one.hasNext()) {
Map data= new HashMap();
data= (HashMap) one.next();
JSONObject d = new JSONObject();
d.putAll(data);
String content=d.toString();
}
回答by jarry_dk
One of the com.mongodb.BasicDBObject constructors takes a Map as input. Then you just have to call the toString() on the BasicDBObject object.
com.mongodb.BasicDBObject 构造函数之一将 Map 作为输入。然后你只需要在 BasicDBObject 对象上调用 toString() 。
Iterator one = (Iterator) friends.find(query).projection("{_id:0}").as(Object.class);
while (one.hasNext()) {
LinkedHashMap data= new LinkedHashMap();
data= (LinkedHashMap) one.next();
com.mongodb.BasicDBObject bdo = new com.mongodb.BasicDBObject(data);
String json = bdo.toString();
}
回答by André Luís Tomaz Dionisio
String content = data.toString()
.replaceAll("=", "\":\"")
.replaceAll(",", "\",\"")
.replaceAll("}", "\"}")
.replaceAll("{", "{\"");
