java 用JAVA写json字符串
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write json string in JAVA
提问by Bin Chen
I am using json developing android sdk. I found writing json string is annoying, take a look:
我正在使用 json 开发 android sdk。我发现写json字符串很烦人，看看：
post_my_server("{\"cmd\":\"new_comment\"}");
I need to manually escape quotes, is there any clean way to do this?
我需要手动转义引号，有没有干净的方法来做到这一点？
回答by rp.
You can use single quotes "{'cmd':'new_comment'}".
您可以使用单引号“{'cmd':'new_comment'}”。
Alternatively, there is free code at http://json.org/java/for implementing JSON at an object level. It's free as in very permissive, I am no lawyer, but it would seem that the only stipulation is that the software you include it in is good, and not evil.
或者，http://json.org/java/ 上有免费代码用于在对象级别实现 JSON。它是免费的，因为非常宽松，我不是律师，但似乎唯一的规定是您包含它的软件是好的，而不是邪恶的。
回答by jayunit100
I use the Hymanson json parsers and serializers , they are completely self contained, and allow for reading, writing of any java object to and from json.
我使用 Hymanson json 解析器和序列化器，它们是完全自包含的，允许从 json 读取、写入任何 java 对象。
Assume you have a file called "user.json" which contains a big json in it....
假设您有一个名为“user.json”的文件，其中包含一个大 json....
private static void convert(){
Map<String,Object> userData = mapper.readValue(new File("user.json"), Map.class);
}
private static void convert(){
Map<String,Object> userData = mapper.readValue(new File("user.json"), Map.class);
}
回答by Prakhyat
To create json string use Hymanson core jars. The code snippet to generate a sample json string ,
JsonFactory jFactory = new JsonFactory();
StringWriter writer = new StringWriter();
/*** write to string ***/
JsonGenerator jsonGenerator = jFactory.createJsonGenerator(writer);
jsonGenerator.writeStartObject();
jsonGenerator.writeStringField("company", [Value]);
jsonGenerator.writeNumberField("salary", [value]);
jsonGenerator.writeEndObject();
jsonGenerator.close();
String jsonString = writer.toString();
