org.apache.httpcomponents:httpclient utility class

Based on httpclient version 4.4.1

Because http connections require three handshakes, resources and time are wasted when frequent calls are required

Therefore, the connection pool is used to connect

Change according to actual needs Maximum number of connections in the connection pool and maximum number of connections in the routing

　Another thing to note is

　　　// 释放Socket流
     response.close();
     // 释放Connection
     // httpClient.close();<br><br>

<span style="color: #008080">  1</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.HttpEntity;
</span><span style="color: #008080">  2</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.NameValuePair;
</span><span style="color: #008080">  3</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.config.RequestConfig;
</span><span style="color: #008080">  4</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.entity.UrlEncodedFormEntity;
</span><span style="color: #008080">  5</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.methods.CloseableHttpResponse;
</span><span style="color: #008080">  6</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.methods.HttpGet;
</span><span style="color: #008080">  7</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.methods.HttpPost;
</span><span style="color: #008080">  8</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.methods.HttpRequestBase;
</span><span style="color: #008080">  9</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.client.utils.URIBuilder;
</span><span style="color: #008080"> 10</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.config.SocketConfig;
</span><span style="color: #008080"> 11</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.entity.StringEntity;
</span><span style="color: #008080"> 12</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.impl.client.CloseableHttpClient;
</span><span style="color: #008080"> 13</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.impl.client.HttpClients;
</span><span style="color: #008080"> 14</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
</span><span style="color: #008080"> 15</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.message.BasicNameValuePair;
</span><span style="color: #008080"> 16</span> <span style="color: #0000ff">import</span><span style="color: #000000"> org.apache.http.util.EntityUtils;
</span><span style="color: #008080"> 17</span> 
<span style="color: #008080"> 18</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.IOException;
</span><span style="color: #008080"> 19</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.io.UnsupportedEncodingException;
</span><span style="color: #008080"> 20</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.net.URISyntaxException;
</span><span style="color: #008080"> 21</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.ArrayList;
</span><span style="color: #008080"> 22</span> <span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Map;
</span><span style="color: #008080"> 23</span> 
<span style="color: #008080"> 24</span> <span style="color: #008000">/**</span>
<span style="color: #008080"> 25</span> <span style="color: #008000"> * Created by lidada on 2017/6/9.
</span><span style="color: #008080"> 26</span>  <span style="color: #008000">*/</span>
<span style="color: #008080"> 27</span> <span style="color: #0000ff">public</span> <span style="color: #0000ff">class</span><span style="color: #000000"> HttpClientUtils {
</span><span style="color: #008080"> 28</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span><span style="color: #000000"> PoolingHttpClientConnectionManager cm;
</span><span style="color: #008080"> 29</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> String EMPTY_STR = ""<span style="color: #000000">;
</span><span style="color: #008080"> 30</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> String CONTENT_TYPE_UTF_8 = "UTF-8"<span style="color: #000000">;
</span><span style="color: #008080"> 31</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> String CONTENT_TYPE_GBK = "GBK"<span style="color: #000000">;
</span><span style="color: #008080"> 32</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> String CONTENT_TYPE_JSON = "application/json"<span style="color: #000000">;
</span><span style="color: #008080"> 33</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">final</span> <span style="color: #0000ff">int</span> CONNECTION_TIMEOUT_MS = 60000<span style="color: #000000">;
</span><span style="color: #008080"> 34</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">final</span> <span style="color: #0000ff">int</span> SO_TIMEOUT_MS = 60000<span style="color: #000000">;
</span><span style="color: #008080"> 35</span> 
<span style="color: #008080"> 36</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">void</span><span style="color: #000000"> init() {
</span><span style="color: #008080"> 37</span>         <span style="color: #0000ff">if</span> (cm == <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080"> 38</span>             cm = <span style="color: #0000ff">new</span><span style="color: #000000"> PoolingHttpClientConnectionManager();
</span><span style="color: #008080"> 39</span>             cm.setMaxTotal(50);<span style="color: #008000">//</span><span style="color: #008000"> 整个连接池最大连接数</span>
<span style="color: #008080"> 40</span>             cm.setDefaultMaxPerRoute(5);<span style="color: #008000">//</span><span style="color: #008000"> 每路由最大连接数，默认值是2</span>
<span style="color: #008080"> 41</span>             SocketConfig sc =<span style="color: #000000"> SocketConfig.custom().setSoTimeout(SO_TIMEOUT_MS).build();
</span><span style="color: #008080"> 42</span> <span style="color: #000000">            cm.setDefaultSocketConfig(sc);
</span><span style="color: #008080"> 43</span> <span style="color: #000000">        }
</span><span style="color: #008080"> 44</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 45</span> 
<span style="color: #008080"> 46</span>     <span style="color: #008000">/**</span>
<span style="color: #008080"> 47</span> <span style="color: #008000">     * 通过连接池获取HttpClient
</span><span style="color: #008080"> 48</span> <span style="color: #008000">     *
</span><span style="color: #008080"> 49</span> <span style="color: #008000">     * </span><span style="color: #808080">@return</span>
<span style="color: #008080"> 50</span>      <span style="color: #008000">*/</span>
<span style="color: #008080"> 51</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span><span style="color: #000000"> CloseableHttpClient getHttpClient() {
</span><span style="color: #008080"> 52</span> <span style="color: #000000">        init();
</span><span style="color: #008080"> 53</span>         <span style="color: #0000ff">return</span> HttpClients.custom().setConnectionManager(cm).setConnectionManagerShared(<span style="color: #0000ff">true</span><span style="color: #000000">) .build();
</span><span style="color: #008080"> 54</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 55</span> 
<span style="color: #008080"> 56</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> String httpGetRequest(String url) {
</span><span style="color: #008080"> 57</span>         HttpGet httpGet = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpGet(url);
</span><span style="color: #008080"> 58</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpGet);
</span><span style="color: #008080"> 59</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 60</span> 
<span style="color: #008080"> 61</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> String httpGetRequest(String url, Map<String, Object> params) <span style="color: #0000ff">throws</span><span style="color: #000000"> URISyntaxException {
</span><span style="color: #008080"> 62</span>         URIBuilder ub = <span style="color: #0000ff">new</span><span style="color: #000000"> URIBuilder();
</span><span style="color: #008080"> 63</span> <span style="color: #000000">        ub.setPath(url);
</span><span style="color: #008080"> 64</span> 
<span style="color: #008080"> 65</span>         ArrayList<NameValuePair> pairs =<span style="color: #000000"> covertParams2NVPS(params);
</span><span style="color: #008080"> 66</span> <span style="color: #000000">        ub.setParameters(pairs);
</span><span style="color: #008080"> 67</span> 
<span style="color: #008080"> 68</span>         HttpGet httpGet = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpGet(ub.build());
</span><span style="color: #008080"> 69</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpGet);
</span><span style="color: #008080"> 70</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 71</span> 
<span style="color: #008080"> 72</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object><span style="color: #000000"> params)
</span><span style="color: #008080"> 73</span>             <span style="color: #0000ff">throws</span><span style="color: #000000"> URISyntaxException {
</span><span style="color: #008080"> 74</span>         URIBuilder ub = <span style="color: #0000ff">new</span><span style="color: #000000"> URIBuilder();
</span><span style="color: #008080"> 75</span> <span style="color: #000000">        ub.setPath(url);
</span><span style="color: #008080"> 76</span> 
<span style="color: #008080"> 77</span>         ArrayList<NameValuePair> pairs =<span style="color: #000000"> covertParams2NVPS(params);
</span><span style="color: #008080"> 78</span> <span style="color: #000000">        ub.setParameters(pairs);
</span><span style="color: #008080"> 79</span> 
<span style="color: #008080"> 80</span>         HttpGet httpGet = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpGet(ub.build());
</span><span style="color: #008080"> 81</span>         <span style="color: #0000ff">for</span> (Map.Entry<String, Object><span style="color: #000000"> param : headers.entrySet()) {
</span><span style="color: #008080"> 82</span> <span style="color: #000000">            httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));
</span><span style="color: #008080"> 83</span> <span style="color: #000000">        }
</span><span style="color: #008080"> 84</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpGet);
</span><span style="color: #008080"> 85</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 86</span> 
<span style="color: #008080"> 87</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span><span style="color: #000000"> String httpPostRequest(String url) {
</span><span style="color: #008080"> 88</span>         HttpPost httpPost = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpPost(url);
</span><span style="color: #008080"> 89</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpPost);
</span><span style="color: #008080"> 90</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 91</span> 
<span style="color: #008080"> 92</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> String httpPostRequest(String url, Map<String, Object> params) <span style="color: #0000ff">throws</span><span style="color: #000000"> UnsupportedEncodingException {
</span><span style="color: #008080"> 93</span>         HttpPost httpPost = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpPost(url);
</span><span style="color: #008080"> 94</span>         ArrayList<NameValuePair> pairs =<span style="color: #000000"> covertParams2NVPS(params);
</span><span style="color: #008080"> 95</span>         httpPost.setEntity(<span style="color: #0000ff">new</span><span style="color: #000000"> UrlEncodedFormEntity(pairs, CONTENT_TYPE_UTF_8));
</span><span style="color: #008080"> 96</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpPost);
</span><span style="color: #008080"> 97</span> <span style="color: #000000">    }
</span><span style="color: #008080"> 98</span> 
<span style="color: #008080"> 99</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object><span style="color: #000000"> params)
</span><span style="color: #008080">100</span>             <span style="color: #0000ff">throws</span><span style="color: #000000"> UnsupportedEncodingException {
</span><span style="color: #008080">101</span>         HttpPost httpPost = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpPost(url);
</span><span style="color: #008080">102</span> 
<span style="color: #008080">103</span>         <span style="color: #0000ff">for</span> (Map.Entry<String, Object><span style="color: #000000"> param : headers.entrySet()) {
</span><span style="color: #008080">104</span> <span style="color: #000000">            httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
</span><span style="color: #008080">105</span> <span style="color: #000000">        }
</span><span style="color: #008080">106</span> 
<span style="color: #008080">107</span>         ArrayList<NameValuePair> pairs =<span style="color: #000000"> covertParams2NVPS(params);
</span><span style="color: #008080">108</span>         httpPost.setEntity(<span style="color: #0000ff">new</span><span style="color: #000000"> UrlEncodedFormEntity(pairs, CONTENT_TYPE_UTF_8));
</span><span style="color: #008080">109</span> 
<span style="color: #008080">110</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpPost);
</span><span style="color: #008080">111</span> <span style="color: #000000">    }
</span><span style="color: #008080">112</span> 
<span style="color: #008080">113</span>     <span style="color: #0000ff">public</span> <span style="color: #0000ff">static</span> String httpPostJSON(String url, String json) <span style="color: #0000ff">throws</span><span style="color: #000000"> UnsupportedEncodingException {
</span><span style="color: #008080">114</span>         HttpPost httpPost = <span style="color: #0000ff">new</span><span style="color: #000000"> HttpPost(url);
</span><span style="color: #008080">115</span>         StringEntity s = <span style="color: #0000ff">new</span><span style="color: #000000"> StringEntity(json);
</span><span style="color: #008080">116</span> <span style="color: #000000">        s.setContentEncoding(CONTENT_TYPE_UTF_8);
</span><span style="color: #008080">117</span>         s.setContentType(CONTENT_TYPE_JSON);<span style="color: #008000">//</span><span style="color: #008000"> 发送json数据需要设置contentType</span>
<span style="color: #008080">118</span> <span style="color: #000000">        httpPost.setEntity(s);
</span><span style="color: #008080">119</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> getResult(httpPost);
</span><span style="color: #008080">120</span> <span style="color: #000000">    }
</span><span style="color: #008080">121</span> 
<span style="color: #008080">122</span> 
<span style="color: #008080">123</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object><span style="color: #000000"> params) {
</span><span style="color: #008080">124</span>         ArrayList<NameValuePair> pairs = <span style="color: #0000ff">new</span> ArrayList<><span style="color: #000000">();
</span><span style="color: #008080">125</span>         <span style="color: #0000ff">for</span> (Map.Entry<String, Object><span style="color: #000000"> param : params.entrySet()) {
</span><span style="color: #008080">126</span>             pairs.add(<span style="color: #0000ff">new</span><span style="color: #000000"> BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
</span><span style="color: #008080">127</span> <span style="color: #000000">        }
</span><span style="color: #008080">128</span> 
<span style="color: #008080">129</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> pairs;
</span><span style="color: #008080">130</span> <span style="color: #000000">    }
</span><span style="color: #008080">131</span> 
<span style="color: #008080">132</span>     <span style="color: #008000">/**</span>
<span style="color: #008080">133</span> <span style="color: #008000">     * 处理Http请求
</span><span style="color: #008080">134</span> <span style="color: #008000">     *
</span><span style="color: #008080">135</span> <span style="color: #008000">     * </span><span style="color: #808080">@param</span><span style="color: #008000"> request
</span><span style="color: #008080">136</span> <span style="color: #008000">     * </span><span style="color: #808080">@return</span>
<span style="color: #008080">137</span>      <span style="color: #008000">*/</span>
<span style="color: #008080">138</span>     <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span><span style="color: #000000"> String getResult(HttpRequestBase request) {
</span><span style="color: #008080">139</span> 
<span style="color: #008080">140</span>         RequestConfig.Builder config =<span style="color: #000000"> RequestConfig.copy(RequestConfig.DEFAULT);
</span><span style="color: #008080">141</span> <span style="color: #000000">        config.setConnectionRequestTimeout(CONNECTION_TIMEOUT_MS);
</span><span style="color: #008080">142</span> <span style="color: #000000">        config.setSocketTimeout(SO_TIMEOUT_MS);
</span><span style="color: #008080">143</span> 
<span style="color: #008080">144</span> <span style="color: #000000">        request.setConfig(config.build());
</span><span style="color: #008080">145</span> 
<span style="color: #008080">146</span>         <span style="color: #008000">//</span><span style="color: #008000"> CloseableHttpClient httpClient = HttpClients.createDefault();</span>
<span style="color: #008080">147</span>         CloseableHttpClient httpClient =<span style="color: #000000"> getHttpClient();
</span><span style="color: #008080">148</span>         CloseableHttpResponse response = <span style="color: #0000ff">null</span><span style="color: #000000">;
</span><span style="color: #008080">149</span>         <span style="color: #0000ff">try</span><span style="color: #000000"> {
</span><span style="color: #008080">150</span>             response =<span style="color: #000000"> httpClient.execute(request);
</span><span style="color: #008080">151</span>             <span style="color: #008000">//</span><span style="color: #008000"> response.getStatusLine().getStatusCode();</span>
<span style="color: #008080">152</span>             HttpEntity entity =<span style="color: #000000"> response.getEntity();
</span><span style="color: #008080">153</span>             <span style="color: #0000ff">if</span> (entity != <span style="color: #0000ff">null</span><span style="color: #000000">) {
</span><span style="color: #008080">154</span>                 <span style="color: #008000">//</span><span style="color: #008000"> long len = entity.getContentLength();</span><span style="color: #008000">//</span><span style="color: #008000"> -1 表示长度未知</span>
<span style="color: #008080">155</span>                 <span style="color: #0000ff">return</span><span style="color: #000000"> EntityUtils.toString(entity);
</span><span style="color: #008080">156</span> <span style="color: #000000">            }
</span><span style="color: #008080">157</span>         } <span style="color: #0000ff">catch</span><span style="color: #000000"> (IOException e) {
</span><span style="color: #008080">158</span> <span style="color: #000000">            e.printStackTrace();
</span><span style="color: #008080">159</span>         } <span style="color: #0000ff">finally</span><span style="color: #000000"> {
</span><span style="color: #008080">160</span>             <span style="color: #0000ff">try</span><span style="color: #000000"> {
</span><span style="color: #008080">161</span>                 <span style="color: #008000">//</span><span style="color: #008000"> 释放Socket流</span>
<span style="color: #008080">162</span> <span style="color: #000000">                response.close();
</span><span style="color: #008080">163</span>                 <span style="color: #008000">//</span><span style="color: #008000"> 释放Connection
</span><span style="color: #008080">164</span>                 <span style="color: #008000">//</span><span style="color: #008000"> httpClient.close();</span>
<span style="color: #008080">165</span>             } <span style="color: #0000ff">catch</span><span style="color: #000000"> (IOException e) {
</span><span style="color: #008080">166</span> <span style="color: #000000">                e.printStackTrace();
</span><span style="color: #008080">167</span> <span style="color: #000000">            }
</span><span style="color: #008080">168</span> <span style="color: #000000">        }
</span><span style="color: #008080">169</span> 
<span style="color: #008080">170</span>         <span style="color: #0000ff">return</span><span style="color: #000000"> EMPTY_STR;
</span><span style="color: #008080">171</span> <span style="color: #000000">    }
</span><span style="color: #008080">172</span> 
<span style="color: #008080">173</span> }

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