Java模拟Http请求远程接口

最近业务需要请求远程API接口，并返回相应的数据，同步到公司的服务器。因此编写了下面两个方法，主要是用Java.net.URL模拟http请求，主要写了POST和GET两个方法。

1.GET请求

/** @auther: Ragty* @describe: Get请求远程接口* @param: [url, parameters]* @return: java.lang.String* @date: 2019/1/16*/public static String sendGet(String url, Map<String, String> parameters) {String result="";BufferedReader in = null;// 读取响应输入流StringBuffer sb = new StringBuffer();// 存储参数String params = "";// 编码之后的参数try {// 编码请求参数if(parameters.size()==1){for(String name:parameters.keySet()){sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));}params=sb.toString();}else{for (String name : parameters.keySet()) {sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8")).append("&");}String temp_params = sb.toString();params = temp_params.substring(0, temp_params.length() - 1);}String full_url = url + "?" + params;System.out.println("请求链接为:"+full_url);// 创建URL对象URL connURL = new java.net.URL(full_url);// 打开URL连接HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();// 设置通用属性httpConn.setRequestProperty("Accept", "*/*");httpConn.setRequestProperty("Connection", "Keep-Alive");httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");// 建立实际的连接httpConn.connect();// 响应头部获取Map<String, List<String>> headers = httpConn.getHeaderFields();// 遍历所有的响应头字段for (String key : headers.keySet()) {System.out.println(key + "\t：\t" + headers.get(key));}// 定义BufferedReader输入流来读取URL的响应,并设置编码方式in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));String line;// 读取返回的内容while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();}finally{try {if (in != null) { in.close(); }} catch (IOException ex) {ex.printStackTrace();}}return result ;}

2.POST请求

/** @auther: Ragty* @describe: Post请求远程接口* @param: [url, parameters]* @return: java.lang.String* @date: 2019/1/16*/public static String sendPost(String url, Map<String, String> parameters) {String result = "";// 返回的结果BufferedReader in = null;// 读取响应输入流PrintWriter out = null;StringBuffer sb = new StringBuffer();// 处理请求参数String params = "";// 编码之后的参数try {// 编码请求参数if (parameters.size() == 1) {for (String name : parameters.keySet()) {sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8"));}params = sb.toString();} else {for (String name : parameters.keySet()) {sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name), "UTF-8")).append("&");}String temp_params = sb.toString();params = temp_params.substring(0, temp_params.length() - 1);}// 创建URL对象URL connURL = new URL(url);// 打开URL连接HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();// 设置通用属性httpConn.setRequestProperty("Accept", "*/*");httpConn.setRequestProperty("Connection", "Keep-Alive");httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");// 设置POST方式httpConn.setDoInput(true);httpConn.setDoOutput(true);// 获取HttpURLConnection对象对应的输出流out = new PrintWriter(httpConn.getOutputStream());// 发送请求参数out.write(params);// flush输出流的缓冲out.flush();// 定义BufferedReader输入流来读取URL的响应，设置编码方式in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));String line;// 读取返回的内容while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();} finally {try {if (out != null) { out.close(); }if (in != null) { in.close(); }} catch (IOException ex) {ex.printStackTrace();}}return result;}

3.结果测试

public static void main(String[] args) {Map<String,String> request = new HashMap<String,String>();request.put("name","ragty");String result = sendGet("https://www.baidu.com",request);System.out.println(result);}

4.输出结果

请求链接为:https://www.baidu.com?name=ragty
null    ：    [HTTP/1.1 200 OK]
Server  ：    [BWS/1.1]
X-Ua-Compatible ：    [IE=Edge,chrome=1]
Connection  ：    [Keep-Alive]
Pragma  ：    [no-cache]
Last-Modified   ：    [Thu, 10 Jan 2019 04:12:20 GMT]
P3p ：    [CP=" OTI DSP COR IVA OUR IND COM "]
Date    ：    [Wed, 16 Jan 2019 12:29:01 GMT]
Accept-Ranges   ：    [bytes]
Etag    ：    ["5c36c624-3982"]
Cache-Control   ：    [no-cache]
Vary    ：    [Accept-Encoding]
Set-Cookie  ：    [PSTM=1547641741; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com, BIDUPSID=A341E15B4265ABB6D36D7938804110FE; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com, BAIDUID=A341E15B4265ABB6D36D7938804110FE:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com]
Content-Length  ：    [14722]
Content-Type    ：    [text/html]
<!DOCTYPE html><!--STATUS OK--><html><head> <meta http-equiv="content-type" content="text/html;charset=utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=Edge">  <link rel="dns-prefetch" href="//s1.bdstatic.com"/> <link rel="dns-prefetch" href="//t1.baidu.com"/>    <link rel="dns-prefetch" href="//t2.baidu.com"/>    <link rel="dns-prefetch" href="//t3.baidu.com"/>    <link rel="dns-prefetch" href="//t10.baidu.com"/>   <link rel="dns-prefetch" href="//t11.baidu.com"/>   <link rel="dns-prefetch" href="//t12.baidu.com"/>   <link rel="dns-prefetch" href="//b1.bdstatic.com"/> <title>百度一下，你就知道</title> <link href="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/home/css/index.css" rel="stylesheet" type="text/css" /> <!--[if lte IE 8]><style index="index" >#content{height:480px\9}#m{top:260px\9}</style><![endif]-->  <!--[if IE 8]><style index="index" >#u1 a.mnav,#u1 a.mnav:visited{font-family:simsun}</style><![endif]-->    <script>var hashMatch = document.location.href.match(/#+(.*wd=[^&].+)/);if (hashMatch && hashMatch[0] && hashMatch[1]) {document.location.replace("http://"+location.host+"/s?"+hashMatch[1]);}var ns_c = function(){};</script>    <script>function h(obj){obj.style.behavior='url(#default#homepage)';var a = obj.setHomePage('//www.baidu.com/');}</script>    <noscript><meta http-equiv="refresh" content="0; url=/baidu.html?from=noscript"/></noscript>  <script>window._ASYNC_START=new Date().getTime();</script></head><body link="#0000cc"><div id="wrapper" style="display:none;"><div id="u"><a href="//www.baidu.com/gaoji/preferences.html"  onmousedown="return user_c({'fm':'set','tab':'setting','login':'0'})">搜索设置</a>|<a id="btop" href="/"  onmousedown="return user_c({'fm':'set','tab':'index','login':'0'})">百度首页</a>|<a id="lb" href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" onclick="return false;"  onmousedown="return user_c({'fm':'set','tab':'login'})">登录</a><a 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href="/" onmousedown="return ns_c({'fm':'behs','tab':'homepage','pos':0})">把百度设为主页</a><a id="setf" href="//www.baidu.com/cache/sethelp/index.html" onmousedown="return ns_c({'fm':'behs','tab':'favorites','pos':0})" target="_blank">把百度设为主页</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about'})" href="http://home.baidu.com">关于百度</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about_en'})" href="http://ir.baidu.com">About Baidu</a></p><p id="cp">&copy;2018&nbsp;Baidu&nbsp;<a href="/duty/" name="tj_duty">使用百度前必读</a>&nbsp;京ICP证030173号&nbsp;<img src="http://s1.bdstatic.com/r/www/cache/static/global/img/gs_237f015b.gif"></p></div></div><div id="wrapper_wrapper"></div></div><div class="c-tips-container" id="c-tips-container"></div><script>window.__async_strategy=2;</script><script>var bds={se:{},su:{urdata:[],urSendClick:function(){}},util:{},use:{},comm : {domain:"http://www.baidu.com",ubsurl : 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Java模拟Http请求远程接口

1.GET请求

2.POST请求

3.结果测试

4.输出结果

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