項目要求：實現post請求，且請求格式是json格式。

maven依賴包

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.3</version>
 </dependency>
 <dependency>
    <groupId>commons-httpclient</groupId>
    <artifactId>commons-httpclient</artifactId>
    <version>3.1</version>
  </dependency>

java代碼實現：

HttpClient httpClient = new HttpClient();
httpClient.getParams().setContentCharset("UTF-8");
PostMethod method = new PostMethod(url);
String str = "{\r\n" + 
    			"	\"beginDate\":\"2017-11-01\",\r\n" + 
    			"	\"endDate\":\"2017-11-01\"\r\n" + 
    			"}";
RequestEntity entity = new StringRequestEntity(str,"application/json","UTF-8");
method.setRequestEntity(entity);
httpClient.executeMethod(method);
InputStream in = method.getResponseBodyAsStream();
//下面將stream轉換為String
StringBuffer sb = new StringBuffer();
InputStreamReader isr = new InputStreamReader(in, "UTF-8");
char[] b = new char[4096];
for(int n; (n = isr.read(b)) != -1;) {
    		sb.append(new String(b, 0, n));
    	}
 String returnStr = sb.toString();
 System.out.println(returnStr);

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java實現post請求（PostMethod）