一、HTTP
1、读取指定城市的天气预报信息
配置好Java环境和IDE,网上方法很多这里就不赘述了。
这里我使用的Java版本是JAVA11,IDE是IDEA。
代码如下:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
public class weather {
public static void main(String args[]) throws IOException
{
URL url = new URL("https://api.jisuapi.com/iqa/query?appkey=62958a3a6ef3c56d&question=重庆天气");
URLConnection conn = url.openConnection();
InputStream is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String text = br.readLine();
System.out.println(text);
br.close();
}
}
之后编译运行即可
结果
2、给指定手机号码发送验证码
短信服务提供商提供的短信接口是收费的,国内可以选择阿里云的,也可以使用其他的。网上能找到免费的,但需要魔法。
这里是我的源码:
public class HttpClientUtil {
private RequestConfig requestConfig = RequestConfig.custom()
.setSocketTimeout(15000)
.setConnectTimeout(15000)
.setConnectionRequestTimeout(15000)
.build();
private static HttpClientUtil instance = null;
private HttpClientUtil(){}
public static HttpClientUtil getInstance(){
if (instance == null) {
instance = new HttpClientUtil();
}
return instance;
}
/**
* 发送 post请求
* @param httpUrl 地址
*/
public String sendHttpPost(String httpUrl) {
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
return sendHttpPost(httpPost,"utf-8");
}
/**
* 发送 post请求
* @param httpUrl 地址
* @param maps 参数
* @param type 字符编码格式
*/
public String sendHttpPost(String httpUrl, Map<String, String> maps,String type) {
HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost
// 创建参数队列
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
for (String key : maps.keySet()) {
nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
}
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, type));
} catch (Exception e) {
e.printStackTrace();
}
return sendHttpPost(httpPost,type);
}
/**
* 发送Post请求
* @param httpPost
* @return
*/
private String sendHttpPost(HttpPost httpPost,String reponseType) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try {
// 创建默认的httpClient实例.
httpClient = HttpClients.createDefault();
httpPost.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpPost);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, reponseType);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
// 关闭连接,释放资源
if (response != null) {
response.close();
}
if (httpClient != null) {
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return responseContent;
}
/**
* 发送 get请求
* @param httpUrl
*/
public String sendHttpGet(String httpUrl) {
HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
return sendHttpGet(httpGet);
}
/**
* 发送 get请求Https
* @param httpUrl
*/
public String sendHttpsGet(String httpUrl) {
HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求
return sendHttpsGet(httpGet);
}
/**
* @Title: sendMsgUtf8
* @Description: TODO(发送utf8)
* @param: @param Uid
* @param: @param Key
* @param: @param content
* @param: @param mobiles
* @param: @return
* @date: 2017-3-22 下午5:58:07
* @throws
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public int sendMsgUtf8(String Uid,String Key,String content,String mobiles){
Map maps = new HashMap();
maps.put("Uid", Uid);
maps.put("Key", Key);
maps.put("smsMob", mobiles);
maps.put("smsText", content);
String result = sendHttpPost("http://utf8.sms.webchinese.cn", maps, "utf-8");
return Integer.parseInt(result);
}
/**
* @Title: sendMsgUtf8
* @Description: TODO(发送utf8)
* @param: @param Uid
* @param: @param Key
* @param: @param content
* @param: @param mobiles
* @param: @return
* @return: int
* @author: ly
* @date: 2017-3-22 下午5:58:07
* @throws
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public int sendMsgGbk(String Uid,String Key,String content,String mobiles){
Map maps = new HashMap();
maps.put("Uid", Uid);
maps.put("Key", Key);
maps.put("smsMob", mobiles);
maps.put("smsText", content);
String result = sendHttpPost("http://gbk.sms.webchinese.cn", maps, "gbk");
return Integer.parseInt(result);
}
/**
* 发送Get请求
* @param httpPost
* @return
*/
private String sendHttpGet(HttpGet httpGet) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try {
// 创建默认的httpClient实例.
httpClient = HttpClients.createDefault();
httpGet.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpGet);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
// 关闭连接,释放资源
if (response != null) {
response.close();
}
if (httpClient != null) {
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return responseContent;
}
/**
* 发送Get请求Https
* @param httpPost
* @return
*/
private String sendHttpsGet(HttpGet httpGet) {
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
HttpEntity entity = null;
String responseContent = null;
try {
// 创建默认的httpClient实例.
PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));
DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);
httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();
httpGet.setConfig(requestConfig);
// 执行请求
response = httpClient.execute(httpGet);
entity = response.getEntity();
responseContent = EntityUtils.toString(entity, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
// 关闭连接,释放资源
if (response != null) {
response.close();
}
if (httpClient != null) {
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return responseContent;
}
/**
* @Title: getErrorMsg
* @Description: TODO(返回异常原因)
* @param: @param errorCode
*/
public String getErrorMsg(int errorCode){
if(errorCode==-1){
return "没有该用户账户";
}else if(errorCode==-2){
return "接口密钥不正确";
}else if(errorCode==-3){
return "短信数量不足";
}else if(errorCode==-4){
return "手机号格式不正确";
}else if(errorCode==-21){
return "MD5接口密钥加密不正确";
}else if(errorCode==-11){
return "该用户被禁用";
}else if(errorCode==-14){
return "短信内容出现非法字符";
}else if(errorCode==-41){
return "手机号码为空";
}else if(errorCode==-42){
return "短信内容为空";
}else if(errorCode==-51){
return "短信签名格式不正确";
}else if(errorCode==-6){
return "IP限制";
}else{
return "未知错误码:"+errorCode;
}
}
}
public class test {
//用户名
private static String Uid = "uid";
//接口安全秘钥
private static String Key = "key";
//手机号码,多个号码如13800000000,13800000001,13800000002
private static String smsMob = "13800000000";
//短信内容
private static String smsText = "验证码:8888";
public static void main(String[] args) {
HttpClientUtil client = HttpClientUtil.getInstance();
//UTF发送
int result = client.sendMsgUtf8(Uid, Key, smsText, smsMob);
if(result>0){
System.out.println("UTF8成功发送条数=="+result);
}else{
System.out.println(client.getErrorMsg(result));
}
}
}
之后编译运行即可。
二、MQTT
1、服务器搭建
下载和安装Apollo服务器
此处为下载链接
然后解压到一个目录,进入dos窗口(cmd命令行窗口)切换到Apollo的目录,进入bin目录,然后运行“apollo.cmd create mybroker”创建服务器实例。
创建实例后会在bin目录下生成用户目录,这里是mybroker,里面有配置服务器信息的文件,和包含连接mqtt服务器的用户名和密码。
启动MQTT。
2.客户端连接MQTT服务器
这里使用mqttbox
Client Name 随便填
Protocol 选择 mqtt / tcp
Host:MQTT服务器的IP地址和端口、Username 和 Password查看bin目录下的用户目录的配置信息查看填写
连接成功后,就可以发布-订阅消息了
小结
通过对MQTT的发布订阅模式的认识,可以很清楚的看到通信的整个过程。客户端的实现,主要包含三个部分,第一部分是实现连接MQTT服务器,第二部分是实现消息的订阅,第三部分是消息的发布。通过运行这个程序,你会发现即使订阅主题的客户端没有运行,发布客户端仍旧会按照规定进行发布消息。由此,可以看出发布者和订阅者两者之间并不会对对方造成影响。这便是这种方式通信的优点所在。