@Service
public class HttpClientService {

private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientService.class);

@Autowired(required=false)
private CloseableHttpClient httpClient;

@Autowired(required=false)
private RequestConfig requestConfig;

/**
 * 实现httpClient的get提交
 * url:localhost:8091/addUser?id=1&name=tom
 * 参数设定
 * uri:表示请求路径
 * Map<String,String> params 进行数据封装
 * charset:字符集编码
 * 
 * 编码思路:
 * 	1.判断是否有参数
 * 		有:uri拼接参数
 *      没有:表示该请求不需要参数
 *  2.判断编码是否为null,则设定默认值utf-8
 *  
 *  3.通过httpClient对象发送请求,之后获取返回值数据
 * @throws URISyntaxException 
 */
public String doGet(String uri,Map<String, String> params, String charset) throws URISyntaxException{
	
	//拼接参数格式
	if(params !=null){
		URIBuilder builder = new URIBuilder(uri);
		for (Map.Entry<String, String> entry : params.entrySet()) {
			//将参数赋值builder
			builder.setParameter(entry.getKey(), entry.getValue());
		}
		//url:localhost:8091/addUser?id=1&name=tom
		uri = builder.build().toString();
	}
	
	//判断编码是否为null
	if(StringUtils.isEmpty(charset)){
		charset = "UTF-8";
	}
	
	//定义get请求对象
	HttpGet httpGet = new HttpGet(uri);
	//定义请求连接的时长
	httpGet.setConfig(requestConfig);
	
	//发送请求
	try {
		CloseableHttpResponse httpResponse = 
		    	httpClient.execute(httpGet);
		
		//判断请求是否正确
		if(httpResponse.getStatusLine().getStatusCode() == 200){
			
			//按照指定字符集解析字符串
			String result = 
					EntityUtils.toString(httpResponse.getEntity(),charset);
			httpResponse.close();
			return result;
		}
		httpResponse.close();
	} catch (Exception e) {
		e.printStackTrace();
	}
	return null;
}

//表示只有uri不需要参数
public String doGet(String uri) throws URISyntaxException{
	
	return doGet(uri, null, null);
}

//需要uri和参数
public String doGet(String uri,Map<String, String> params) throws URISyntaxException{
	
	return doGet(uri, params, null);
}


/**
 * 实现httpClient的post提交方式
 * 1.创建POST请求的对象
 * 2.添加请求的参数(请求的链接时长)
 * 3.将需要传递的参数通过form表单的形式进行数据封装
 * 4.发出http请求获取响应信息
 * 5.判断响应是否成功.之后返回数据
 * @throws UnsupportedEncodingException 
 */
public String doPost(String uri,Map<String, String> params,String charset) throws UnsupportedEncodingException{
	
	//1.创建post请求对象
	HttpPost httpPost = new HttpPost(uri);
	
	//2.添加请求的设定参数
	httpPost.setConfig(requestConfig);
	
	if(charset == null){
		//给定默认值
		charset = "UTF-8";
	}
	
	if(params !=null){
    	//3.定义Form表单的封装对象
    	//3.1定义参数的集合
    	List<NameValuePair> parameters = new ArrayList<NameValuePair>();
    	
    	//3.2为集合赋值
    	for (Map.Entry<String, String> entry : params.entrySet()) {
			
    		parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
		}
    	//3.3为form表单实体对象赋值
    	UrlEncodedFormEntity formEntity = 
    			new UrlEncodedFormEntity(parameters,charset); 

    	//3.4将表单赋值post请求
    	httpPost.setEntity(formEntity);
	}
	//4.发送请求获取返回值参数
	try {
		CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
		//5.判断返回值是否有效
		if(httpResponse.getStatusLine().getStatusCode() == 200){
			//表示数据是有效的
			String result = EntityUtils.toString(httpResponse.getEntity(),charset);
			httpResponse.close();
			return result;
		}
		//6.将返回值对象关闭
		httpResponse.close();
	} catch (Exception e) {
		e.printStackTrace();
	}
	return null;
}

public String doPost(String uri) throws Exception{
	
	return doPost(uri, null, null);
}

public String doPost(String uri,Map<String,String> params) throws Exception{
	
	return doPost(uri, params, null);
}

}