用serde_json箱，我可以用
::serde_json::to_string(&obj)
若要将对象序列化为JSON字符串，请执行以下操作.生成的JSON使用紧凑的格式，如:
{"foo":1,"bar":2}
But how do I generate pretty/indented JSON? For example, I'd like to get this:
{
"foo": 1,
"bar": 2
}
用serde_json箱，我可以用
::serde_json::to_string(&obj)
若要将对象序列化为JSON字符串，请执行以下操作.生成的JSON使用紧凑的格式，如:
{"foo":1,"bar":2}
But how do I generate pretty/indented JSON? For example, I'd like to get this:
{
"foo": 1,
"bar": 2
}
The serde_json::to_string_pretty function generates pretty-printed indented JSON.
#[macro_use]
extern crate serde_json;
fn main() {
let obj = json!({"foo":1,"bar":2});
println!("{}", serde_json::to_string_pretty(&obj).unwrap());
}
此方法默认缩进2个空格，这恰好是您在问题中要求的.您可以使用PrettyFormatter::with_indent来自定义缩进.
#[macro_use]
extern crate serde_json;
extern crate serde;
use serde::Serialize;
fn main() {
let obj = json!({"foo":1,"bar":2});
let buf = Vec::new();
let formatter = serde_json::ser::PrettyFormatter::with_indent(b" ");
let mut ser = serde_json::Serializer::with_formatter(buf, formatter);
obj.serialize(&mut ser).unwrap();
println!("{}", String::from_utf8(ser.into_inner()).unwrap());
}