c语言天气预报 对于http api,如何使用百度天气预报API接口

天气预报 对于http api,如何使用百度天气预报API接口"/>

c语言天气预报 对于http api,如何使用百度天气预报API接口

前些天知道了如何获取数字签名SHA1，那它用来干嘛的呢？今天就来学习一下它的用处。

比如说我们要开发一款基于位置的服务，如地图、天气预报等。我们要用到API Key。

百度API Key申请地址：

创建应用 如图：

提交后得到API Key 如图：

接口实例：？location=南昌&output=json&ak=你的API Key&mcode=你的数字签名SHA1;com.example.administrator.jsontest(包名)

接口参数说明

参数类型

参数名称

是否必须

具体描述

String

location

true

输入城市名或经纬度，城市名如北京或者131，经纬度格式为lng，lat坐标，如：location=116.305145,39.982368;全国值为all，返回省会城市自治区，港澳台天气情况多城市天气预报中间用“|”分隔，如：location=116.305145,39.982368|123.342323,36238945|...

String

output

false

输出的数据格式，默认为xml格式，当output设置为json时，输出的为json数据格式

String

coord_type

false

请求参数坐标类型，默认为gcj02经纬度坐标。允许的值为bd09ll、bd09mc、gcj02、wgs84；

返回的JSON数据

{

"error":0,

"status":"success",

"date":"2016-03-05",

"results":[

{

"currentCity":"北京",

"pm25":"144",

"index":[

{

"title":"穿衣",

"zs":"较冷",

"tipt":"穿衣指数",

"des":"建议着厚外套加毛衣等服装。年老体弱者宜着大衣、呢外套加羊毛衫。"},

{

"title":"洗车",

"zs":"不宜",

"tipt":"洗车指数",

"des":"不宜洗车，未来24小时内有扬沙或浮尘，如果在此期间洗车，极易很快蒙上新的灰尘。"},

{

"title":"旅游",

"zs":"一般",

"tipt":"旅游指数",

"des":"风稍大，扬沙或浮尘天气对能见度和空气质量都会有些影响，出行请注意交通安全和采取适当的防尘措施。"},

{

"title":"感冒",

"zs":"易发",

"tipt":"感冒指数",

"des":"昼夜温差大，风力较强，易发生感冒，请注意适当增减衣服，加强自我防护避免感冒。"},

{

"title":"运动",

"zs":"较不宜",

"tipt":"运动指数",

"des":"有扬沙或浮尘，建议适当停止户外运动，选择在室内进行运动，以避免吸入更多沙尘，有损健康。"},

{

"title":"紫外线强度",

"zs":"最弱",

"tipt":"紫外线强度指数",

"des":"属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"}

],

"weather_data":[

{

"date":"周六 03月05日 (实时：12℃)", "dayPictureUrl":".png",

"nightPictureUrl":".png",

"weather":"浮尘转晴",

"wind":"北风4-5级",

"temperature":"12 ~ -1℃"},

{

"date":"周日",

"dayPictureUrl":".png",

"nightPictureUrl":".png",

"weather":"多云",

"wind":"微风",

"temperature":"10 ~ -3℃"},

{

"date":"周一", "dayPictureUrl":".png",

"nightPictureUrl":".png",

"weather":"多云转阴",

"wind":"微风",

"temperature":"13 ~ 2℃"},

{

"date":"周二", "dayPictureUrl":".png",

"nightPictureUrl":".png",

"weather":"阴转多云",

"wind":"北风3-4级",

"temperature":"6 ~ -1℃"}

]}]}

我们来写个demo，代码如下：

package com.example.administrator.jsontest;

public class MainActivity extends Activity {

private Button button;

private TextView textView;

private Handler handler = new Handler() {

@Override

public void handleMessage(Message msg) {

switch (msg.what) {

case 0:

String re = (String) msg.obj;

textView.setText(re);

break;

}

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

button = (Button) findViewById(R.id.button);

textView = (TextView) findViewById(R.id.textView);

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

Log.i("TAG", "点击了Button");

sendRequestWithHttpClient();

}

});

}

private void sendRequestWithHttpClient() {

new Thread(new Runnable() {

@Override

public void run() {

HttpURLConnection connection = null;

try {

URL url = new URL("=南昌&output=json&ak=8ixCCFzlBB617YX7tONI2P5B&mcode=1C:6B:42:33:E8:A6:DC:A2:11:6E:26:EC:84:BD:42:E3:8E:6B:57:9A;com.example.administrator.jsontest");

connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("GET");

connection.setConnectTimeout(5000);

connection.setReadTimeout(5000);

InputStream in = connection.getInputStream();

BufferedReader reader = new BufferedReader(new InputStreamReader(in));

StringBuilder response = new StringBuilder();

String line;

while ((line = reader.readLine()) != null) {

response.append(line);

}

Log.i("TAG", response.toString()); parseJSONObjectOrJSONArray(response.toString());

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}).start();

}

//解析JSON数据

private void parseJSONObjectOrJSONArray(String jsonData) {

try {

String count = "";

JSONObject jsonObject = new JSONObject(jsonData);

JSONArray jsonArray = jsonObject.getJSONArray("results");

if (jsonArray.length() > 0) {

JSONObject object = jsonArray.getJSONObject(0);

String city = object.optString("currentCity");

JSONArray array = object.getJSONArray("weather_data");

for (int i = 0; i < array.length(); i++) {

JSONObject jsonObject1 = array.getJSONObject(i);

String dateDay = jsonObject1.optString("date");

String weather = jsonObject1.optString("weather");

String wind = jsonObject1.optString("wind");

String temperature = jsonObject1.optString("temperature");

count =count +"\n"+ dateDay + " " + weather + " " + wind + " " + temperature;

Log.i("AAA",count);

}

Message message = new Message();

message.what = 0;

message.obj = count;

handler.sendMessage(message);

}

} catch (JSONException e) {

e.printStackTrace();

}

}

}

运行结果如下：