使用 serde 生成漂亮的(缩进的)JSON

发布于03月04日

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
}

推荐答案

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());
}