Java + jackson 解析错误无法识别的字符转义
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Java + Hymanson parsing error Unrecognized character escape
提问by Amila Iddamalgoda
I need to do a POST json string , using HttpClient. Following will be the code i have. From the other end the Json is mapped to an object.
我需要使用 HttpClient 做一个 POST json 字符串。以下将是我拥有的代码。从另一端，Json 被映射到一个对象。
HttpClient client = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(url);
String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemo\mlpdemoins\" }";
post.setEntity(new ByteArrayEntity( jsonData.toString().getBytes("UTF8")));
HttpResponse response = client.execute(post);
Here all others are correctly mapping expect the userId. Here the problem is with the backward slash(mlpdemo\mlpdemins). I guess. If I send a single string as the user id it will be mapped without any issues. Eg:-
这里所有其他人都正确映射除了 userId。这里的问题在于反斜杠（mlpdemo\mlpdemins）。我猜。如果我发送一个字符串作为用户 id，它将被毫无问题地映射。例如：-
String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemoins\" }";
This works .
这有效。
But I need this (mlpdemo\mlpdemins)to be sent through the POSt. Please help me out.
但我需要这个（mlpdemo\mlpdemins）通过 POSt 发送。请帮帮我。
String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemo\mlpdemoins\" }";
Here is the exception Im getting.
这是我得到的例外。
com.fasterxml.Hymanson.core.JsonParseException: Unrecognized character escape 'm' (code 109)
at [Source: java.io.InputStreamReader@29f0a0a2; line: 1, column: 62]
BadRequestException (0ea35150-f33a-4932-a31e-8a1048af53ad): 400 Bad Request, com.strategicgains.restexpress.serialization.DeserializationException: com.fasterxml.Hymanson.core.JsonParseException: Unrecognized character escape 'm' (code 109)
at [Source: java.io.InputStreamReader@29f0a0a2; line: 1, column: 62]
at com.strategicgains.restexpress.Request.getBodyAs(Request.java:165)
at com.strategicgains.restexpress.Request.getBodyAs(Request.java:181)
采纳答案by Sach141
mlpdemo\mlpdemoinsis an invalid string you can't use it in JSON . But you can use mlpdemo\\mlpdemoinseasily.
mlpdemo\mlpdemoins是一个无效字符串，您不能在 JSON 中使用它。但您可以mlpdemo\\mlpdemoins轻松使用。
below code works fine for me :
下面的代码对我来说很好用：
String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemo\\mlpdemoins\" }";
ObjectMapper mapper=new ObjectMapper();
System.out.println(mapper.readTree(jsonData));
It will produce this output JSON :
它将产生此输出 JSON ：
{"provider":null,"password":"a","userid":"mlpdemo\mlpdemoins"}
回答by ogarzonm
Set your mapper
设置映射器
mapper.configure(JsonParser.Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER, true);
