小知识,大挑战!本文正在参与“程序员必备小知识”创作活动。
以前的调用方式
最近项目上有个发起请求的需求.就开始找项目里的工具类.
发现项目里的http工具类五花八门 请求代码过长不够优雅. 具体的方法就不贴了 太占地方.
`
private static HttpsURLConnection initHttps(String url, String method,
Map<String, String> headers) throws Exception {
TrustManager[] tm = { new MyX509TrustManager() };
System.setProperty("https.protocols", "TLSv1");
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL _url = new URL(url);
HttpsURLConnection http = (HttpsURLConnection) _url.openConnection();
// 设置域名校验
http.setHostnameVerifier(new HttpUtil().new TrustAnyHostnameVerifier());
// 连接超时
http.setConnectTimeout(DEF_CONN_TIMEOUT);
// 读取超时 --服务器响应比较慢,增大时间
http.setReadTimeout(DEF_READ_TIMEOUT);
http.setUseCaches(false);
http.setRequestMethod(method);
http.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
http.setRequestProperty(
"User-Agent",
"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
if (null != headers && !headers.isEmpty()) {
for (Entry<String, String> entry : headers.entrySet()) {
http.setRequestProperty(entry.getKey(), entry.getValue());
}
}
http.setSSLSocketFactory(ssf);
http.setDoOutput(true);
http.setDoInput(true);
http.connect();
return http;
}
public static String get(String url, Map<String, String> params,
Map<String, String> headers) throws Exception {
HttpURLConnection http = null;
if (isHttps(url)) {
http = initHttps(initParams(url, params), _GET, headers);
} else {
http = initHttp(initParams(url, params), _GET, headers);
}
InputStream in = http.getInputStream();
BufferedReader read = new BufferedReader(new InputStreamReader(in,
DEFAULT_CHARSET));
String valueString = null;
StringBuffer bufferRes = new StringBuffer();
while ((valueString = read.readLine()) != null) {
bufferRes.append(valueString);
}
in.close();
if (http != null) {
http.disconnect();// 关闭连接
}
return bufferRes.toString();
}
public static String post(String url, String params)
throws Exception {
HttpURLConnection http = null;
if (isHttps(url)) {
http = initHttps(url, _POST, null);
} else {
http = initHttp(url, _POST, null);
}
OutputStream out = http.getOutputStream();
out.write(params.getBytes(DEFAULT_CHARSET));
out.flush();
out.close();
InputStream in = http.getInputStream();
BufferedReader read = new BufferedReader(new InputStreamReader(in,
DEFAULT_CHARSET));
String valueString = null;
StringBuffer bufferRes = new StringBuffer();
while ((valueString = read.readLine()) != null) {
bufferRes.append(valueString);
}
in.close();
if (http != null) {
http.disconnect();// 关闭连接
}
return bufferRes.toString();
}
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链式调用
就想着有没有方便开箱就用的请求框架...发现了一款可以链式调用的OkHttps框架很好用.
调用示例
List<User> users = http.sync("/users") // 请求数据的链接🔗
.get() // GET请求
.getBody() // 获取响应报文体
.toList(User.class); // 得到目标数据
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快速上手
引入maven包
<dependency>
<groupId>com.ejlchina</groupId>
<artifactId>okhttps</artifactId>
<version>3.1.5</version>
</dependency>
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注意:单独使用 OkHttps 需要自定义MsgConvertor,否则无法使用 自动正反序列化 相关功能.
使用
- 构建 HTTP
HTTP http = HTTP.builder().build();
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- 同步请求
List<User> users = http.sync("/users")
.get()
.getBody()
.toList(User.class);
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- 异步请求
http.async("/users")
.setOnResponse((HttpResult res) -> {
// 得到目标数据
User user = res.getBody().toBean(User.class);
})
.get();
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- WebSocket
http.webSocket("/chat")
.setOnOpen((WebSocket ws, HttpResult res) -> {
ws.send("hello world");
})
.setOnMessage((WebSocket ws,Message msg) -> {
// 从服务器接收消息(自动反序列化)
Chat chat = msg.toBean(Chat.class);
// 相同的消息发送给服务器(自动序列化 Chat 对象)
ws.send(chat);
})
.listen();
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一般请求分三步:
第一步、确定请求方式
同步 HTTP(sync
)、异步 HTTP(async
)或 WebSocket(webSocket
)
第二步、构建请求任务
addXxxPara
- 添加请求参数setOnXxxx
- 设置回调函数tag
- 添加标签- ...
第三步、调用请求方法
HTTP 请求方法:
get()
- GET 请求post()
- POST 请求put()
- PUT 请求delete()
- DELETE 请求- ...
Websocket 方法:
listen()
- 启动监听
具体的介绍就到这里了..有想法的小朋友可以去官方文档查看:
okhttps.ejlchina-app.com/v3/
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