Flutter -------- Http库 网络请求封装（HttpController）

dependencies:
http: ^0.12.0 #latest version

import 'package:http/http.dart' as http; //导入前需要配置

import 'package:http/http.dart' as http;class HttpController {
static void get(String url, Function callback,
{Map<String, String> params, Function errorCallback}) async {
if (params != null && params.isNotEmpty) {
StringBuffer sb = new StringBuffer("?");
params.forEach((key, value) {
sb.write("$key" + "=" + "$value" + "&");
});
String paramStr = sb.toString();
paramStr = paramStr.substring(0, paramStr.length - 1);
url += paramStr;
}
try {
http.Response res = await http.get(url);
if (callback != null) {
callback(res.body);
}
} catch (exception) {
if (errorCallback != null) {
errorCallback(exception);
}
}
} static void post(String url, Function callback,
{Map<String, String> params, Function errorCallback}) async {
try {
http.Response res = await http.post(url, body: params); if (callback != null) {
callback(res.body);
}
} catch (e) {
if (errorCallback != null) {
errorCallback(e);
}
}
}
}

import 'dart:convert';
import 'package:flutter/material.dart';import 'package:flutter_test1/http/HttpController.dart';class HomePage extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return new Page();
}
}class Page extends State<HomePage> {
String dataStr = "";
var _items = []; @override
Widget build(BuildContext context) {
return layout(context);
} @override
void initState() {
super.initState();
getData();
} void getData() {
Map<String, String> map = new Map();
map["v"] = "1.0";
map["month"] = "7";
map["day"] = "25";
map["key"] = "bd6e35a2691ae5bb8425c8631e475c2a";
HttpController.post("http://api.juheapi.com/japi/toh", (data) {
if (data != null) {
final body = json.decode(data.toString());
final feeds = body["result"];
var items = [];
feeds.forEach((item) {
items.add(Model(item["_id"], item["title"], item["pic"], item["year"],
item["month"], item["day"], item["des"], item["lunar"]));
});
setState(() {
dataStr = data.toString();
_items = items;
});
}
}, params: map);
} Widget layout(BuildContext context) {
return new Scaffold(
appBar: buildAppBar(context),
body:
new ListView.builder(itemCount: _items.length, itemBuilder: itemView),
);
} Widget itemView(BuildContext context, int index) {
Model model = this._items[index];
//设置分割线
if (index.isOdd) return new Divider(height: 2.0);
return new Container(
color: Color.fromARGB(0x22, 0x49, 0xa9, 0x8d),
child: new Padding(
padding: const EdgeInsets.all(8.0),
child: new Padding(
padding: const EdgeInsets.all(8.0),
child: new Column(
children: <Widget>[
new Row(
children: <Widget>[
new Text('${model.year}年${model.month}月${model.day}日',
style: new TextStyle(fontSize: 15.0)),
new Text('(${model.lunar})',
style: new TextStyle(fontSize: 15.0)),
],
),
new Center(
heightFactor: 6.0,
child: new Text("${model.title}",
style: new TextStyle(fontSize: 17.0)),
)
],
))));
} Widget buildAppBar(BuildContext context) {
return new AppBar(title: const Text('历史今日'));
}
}class Model {
String _id;
String title;
String pic;
int year;
int month;
int day;
String des;
String lunar; Model(this._id, this.title, this.pic, this.year, this.month, this.day,
this.des, this.lunar);
}