微信公众号：冯文议（ID：fwy-world）
HTTP申请，在日常开发中，还是比拟常见的，明天给大家分享HttpUtils如何应用。
浏览本文，你将播种：
- 简略总结HTTP申请罕用配置；
- JavaLib中HttpUtils如何应用；
- 如何封装HTTP申请工具类。
第一局部：简略总结HTTP申请罕用配置
大家好，在 Java 开发中，常常遇到须要调用第三方提供的接口服务，常见的模式是 HTTP + JSON，上面，就对 http 申请常见的设置，做一个阐明
http提供多种申请形式，以满足咱们日常须要，先按申请形式来做阐明：
- GET
- POST
- PUT
- PATCH
- DELETE
在 RESTful API 开发中，咱们能够依据这些申请形式设计咱们的API接口。举例：
- GET：获取资源
- POST：提交资源
- PUT：更新残缺资源
- PATCH：更新局部资源
- DELETE：删除资源
参数格局
- form表单
- json
其余
- 超时工夫设置
第二局部：应用JavaLib的HttpUtils
简略的get申请
System.out.println(HttpUtils.get("https://www.baidu.com"));响应后果：
通过简略尝试，证实两点：
- 一是，这个还是能够应用的；
- 二是，原来应用如此简略。
如果要你手写一个http申请，或者你脑海里一篇空白，会去搜寻各种材料。
咱们再试一个简单的
接口：
接口地址：https://erwin-api.fengwenyi.com/erwin/blog/page
申请办法：GET
参数：currentPage，pageSize
参数格局：form
响应：application/json
String url = "https://erwin-api.fengwenyi.com/erwin/bookmark/page?currentPage=1&pageSize=10";Request request = new Request();request.setUrl(url);request.setMethod(Request.Method.GET);Map<String, String> headerMap = new HashMap<>();headerMap.put("Accept", "application/json");Request.Option option = new Request.Option();option.setHeaders(headerMap);try { System.out.println(HttpUtils.execute(request, option));} catch (IOException e) { throw new RuntimeException(e);}响应后果：
{ "code":"SUCCESS", "message":"Success", "success":true, "header":null, "body":{ "currentPage":1, "pageSize":10, "totalRows":661, "totalPages":67, "content":[ { "id":"1634772578877935617", "timestamp":1678595130000, "enabledState":null, "name":"VScode 中文显示呈现黄色方框的解决办法_vscode汉字被框住_YJer的博客-CSDN博客", "url":"https://blog.csdn.net/qq_33249042/article/details/123252625", "icon":null, "classifyName":"软件", "classifyId":"1522587269600481281" }, { "id":"1632640455110922241", "timestamp":1678086792000, "enabledState":null, "name":"Spring中init-method和destroy-method的四种形式_星夜孤帆的博客-CSDN博客", "url":"https://blog.csdn.net/qq_38826019/article/details/117387398", "icon":null, "classifyName":"Spring", "classifyId":"1522586360887742466" }, { "id":"1631597310596190209", "timestamp":1677838087000, "enabledState":null, "name":"vue3 + elemenplus实现导航栏 - 掘金", "url":"https://juejin.cn/post/7084871748608327687", "icon":null, "classifyName":"前端", "classifyId":"1525554881275990018" }, { "id":"1631593154401636354", "timestamp":1677837096000, "enabledState":null, "name":"Spring bean 创立过程源码解析 - 腾讯云开发者社区-腾讯云", "url":"https://cloud.tencent.com/developer/article/1631160", "icon":null, "classifyName":"Spring", "classifyId":"1522586360887742466" }, { "id":"1631592987673858050", "timestamp":1677837056000, "enabledState":null, "name":"SpringBoot之容器启动源码剖析与Bean加载_springboot加载bean 源码_minemine0418的博客-CSDN博客", "url":"https://blog.csdn.net/minemine0418/article/details/102308912", "icon":null, "classifyName":"Spring Boot", "classifyId":"1522586446766116865" }, { "id":"1631586585454678018", "timestamp":1677835530000, "enabledState":null, "name":"Spring-Bean生命周期 - 知乎", "url":"https://zhuanlan.zhihu.com/p/158468104", "icon":null, "classifyName":"Spring", "classifyId":"1522586360887742466" }, { "id":"1631579732104548354", "timestamp":1677833896000, "enabledState":null, "name":"一文读懂 Spring Bean 的生命周期_spring bean的生命周期_老周聊架构的博客-CSDN博客", "url":"https://blog.csdn.net/riemann_/article/details/118500805", "icon":null, "classifyName":"Spring", "classifyId":"1522586360887742466" }, { "id":"1630768897186697218", "timestamp":1677640578000, "enabledState":null, "name":"MySQL同时统计多个条件的记录条数_ztnhnr的博客-CSDN博客", "url":"https://blog.csdn.net/ztnhnr/article/details/107165942", "icon":null, "classifyName":"MySQL", "classifyId":"1522586805693681666" }, { "id":"1630768792098410497", "timestamp":1677640553000, "enabledState":null, "name":"sql查问近七天，近两周，近一个月的数据_sql最近一周数据_心诚则灵＇的博客-CSDN博客", "url":"https://blog.csdn.net/wenchangwenliu/article/details/119891790", "icon":null, "classifyName":"MySQL", "classifyId":"1522586805693681666" }, { "id":"1630480535938764801", "timestamp":1677571827000, "enabledState":null, "name":"开源流程引擎哪个好，如何选型？ - 知乎", "url":"https://zhuanlan.zhihu.com/p/369761832", "icon":null, "classifyName":"Java", "classifyId":"1522586296119300097" } ] }}响应后果，还是合乎预期的。
当然，HTTP还有其余，比方超时等等，上面看看完整版的申请示例：
Map<String, Object> paramMap = new HashMap<>();paramMap.put("currentPage", 1);paramMap.put("pageSize", 10);Map<String, String> headerMap = new HashMap<>();headerMap.put("Accept", "application/json");Request request = new Request();request.setUrl("https://erwin-api.fengwenyi.com/erwin/bookmark/page");request.setParam(paramMap);request.setMethod(Request.Method.GET);request.setUtil(Request.Util.OkHttp);Request.Option option = new Request.Option();option.setHeaders(headerMap);option.setConnectTimeoutSecond(3);option.setReadTimeoutSecond(5);option.setLogLevel(Request.LogLevel.DEBUG);try { String result = HttpUtils.execute(request, option); System.out.println(result);} catch (IOException e) { throw new RuntimeException(e);}响应后果也是跟下面一样的。
第三局部：分享HttpUtils是如何封装的
首先是 Request 和 Response 对应HTTP的申请和响应，包门路如下：
- com.fengwenyi.javalib.http.Request
- com.fengwenyi.javalib.http.Response
另外，com.fengwenyi.javalib.http.Request.Option 来寄存HTTP参数配置。
这一部分的思路起源是 Spring Cloud OpenFeign。
为了兼容多种HTTP工具实现申请，引入了 HttpClientFactory，其余工具类，只有实现 HttpClient 接口，就行。
- com.fengwenyi.javalib.http.client.HttpClient
- com.fengwenyi.javalib.http.client.HttpClientFactory
欧克，上面咱们就以代码来看看：
HttpUtils#execute
public static String execute(Request request, Request.Option option) throws IOException { check(request); HttpClient httpClient = HttpClientFactory.get(request.getUtil()); Response response = httpClient.execute(request, option); return handleResponse(response);}HttpClientFactory#get
public static HttpClient get(Request.Util httpUtil) { if (Request.Util.JDK == httpUtil) { return new JdkHttpClient(); } else if (Request.Util.OkHttp == httpUtil) { return new OkHttpClient(); } else { throw new RuntimeException("not find http util: " + httpUtil.name()); }}所以，只须要实现 HttpClient#execute 接口就行。
Response execute(Request request, Request.Option option) throws IOException;源码：https://github.com/fengwenyi/JavaLib
好了，明天的分享就到这里了。我是小冯，一名Java程序员，专一于程序设计和开发，如果你在开发上遇到问题，欢送一起交换，微信公众号：冯文议（ID：fwy-world）。