Java + jackson解析错误无法识别的字符转义 [英] Java + jackson parsing error Unrecognized character escape

问题描述

我需要使用HttpClient来做一个POST json字符串。以下将是我的代码。从另一端，Json被映射到一个对象。

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.

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);

这里所有其他人都正确映射期望userId。这里的问题是反斜杠（ mlpdemo \ mlpdemins ）。我猜。如果我发送一个字符串作为用户ID，它将被映射而没有任何问题。
例如： -

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:-

String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemoins\" }";

这样做。

但我需要这个（ mlpdemo \ mlpdemins ）将通过POSt发送。请帮帮我。

But I need this (mlpdemo\mlpdemins)to be sent through the POSt. Please help me out.

String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemo\\mlpdemoins\" }";

以下是我得到的例外情况。

Here is the exception Im getting.

com.fasterxml.jackson.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.jackson.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)

推荐答案

mlpdemo \ mlpdemoins 是一个无效的字符串，你不能在JSON中使用它。但你可以轻松地使用 mlpdemo \\mlpdemoins 。

mlpdemo\mlpdemoins is an invalid string you can't use it in JSON . But you can use mlpdemo\\mlpdemoins easily.

以下代码对我来说没问题：

below code works fine for me :

String jsonData = "{ \"provider\" : null , \"password\" : \"a\", \"userid\" : \"mlpdemo\\\\mlpdemoins\" }";

ObjectMapper mapper=new ObjectMapper();

System.out.println(mapper.readTree(jsonData));

它将产生此输出JSON：

It will produce this output JSON :

{"provider":null,"password":"a","userid":"mlpdemo\\mlpdemoins"}

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