HttpClientUtils

public class HttpclientUtils {

@Autowired(required = false)
private CloseableHttpClient httpClient;

@Autowired(required = false)
private RequestConfig config;

/**
 * 没有带参数GET请求
 * 
 * @param url 请求地址
 * @return 返回状态码为200 返回页面内容 否则,返回null
 * @throws Exception
 */
public String doget(String url) throws Exception {
    // 创建http GET请求
    HttpGet httpGet = new HttpGet(url);

    // 设置请求参数
    httpGet.setConfig(config);
    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpGet);
        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            String content = EntityUtils.toString(response.getEntity(), "UTF-8");
            return content;
        }
    } finally {
        if (response != null) {
            response.close();
        }

        // httpClient.close();
    }
    return null;

}

/**
 * 带有参数GET请求
 * 
 * @param url 请求地址
 * @param params 请求参数
 * @return 返回状态码为200 返回页面内容 否则,返回null
 * @throws Exception
 */
public String doget(String url, Map<String, Object> params) throws Exception {

    // 定义请求的参数
    URIBuilder uriBuilder = new URIBuilder(url);
    if (!params.isEmpty()) {
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
        }
    }
    URI uri = uriBuilder.build();
    // 创建http GET请求
    HttpGet httpGet = new HttpGet(uri);

    // 设置请求参数
    httpGet.setConfig(config);

    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpGet);
        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            return EntityUtils.toString(response.getEntity(), "UTF-8");
        }
    } finally {
        if (response != null) {
            response.close();
        }
        // httpclient.close();
    }
    return null;

}

/**
 * 带有参数的POST
 * @param url 请求地址
 * @param params 请求参数
 * @return 返回状态码为200 HttpResut(200,内容) 否则,返回HttpResut(当前状态码,null)
 * @throws Exception
 */
public HttpResut dopost(String url, Map<String, Object> params) throws Exception {
    // 创建http POST请求
    HttpPost httpPost = new HttpPost(url);
    // 设置2个post参数，一个是scope、一个是q
    List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
    if (!params.isEmpty()) {
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
        }
    }
    // 构造一个form表单式的实体
    UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
    // 将请求实体设置到httpPost对象中
    httpPost.setEntity(formEntity);

    // 设置请求参数
    httpPost.setConfig(config);

    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpPost);
        // 判断返回状态是否为200
        if (response.getStatusLine().getStatusCode() == 200) {
            return new HttpResut(response.getStatusLine().getStatusCode(), EntityUtils.toString(
                    response.getEntity(), "UTF-8"));
        }
    } finally {
        if (response != null) {
            response.close();
        }
        // httpclient.close();
    }
    return new HttpResut(response.getStatusLine().getStatusCode(), null);

}

/**
 * 没有带参数POST请求
 * @throws Exception 
 */
public HttpResut dopost(String url) throws Exception{
    return this.dopost(url, new HashMap<String, Object>());
}

//doput dodelete dopostjson ...

/**
 * 指定POST请求
 * 
 * @param url
 * @param param 请求参数
 * @return 状态码和请求的body
 * @throws IOException
 */
public HttpResut doPostJson(String url, String json) throws IOException {
    // 创建http POST请求
    HttpPost httpPost = new HttpPost(url);
    httpPost.setConfig(this.config);
    if (json != null) {
        // 构造一个字符串的实体
        StringEntity stringEntity = new StringEntity(json, ContentType.APPLICATION_JSON);
        // 将请求实体设置到httpPost对象中
        httpPost.setEntity(stringEntity);
    }

    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpPost);
        if (response.getEntity() != null) {
            return new HttpResut(response.getStatusLine().getStatusCode(), EntityUtils.toString(
                    response.getEntity(), "UTF-8"));
        }
        return new HttpResut(response.getStatusLine().getStatusCode(), null);
    } finally {
        if (response != null) {
            response.close();
        }
    }
}

/**
 * 执行PUT请求
 * 
 * @param url
 * @param param 请求参数
 * @return 状态码和请求的body
 * @throws IOException
 */
public HttpResut doPut(String url, Map<String, Object> param) throws IOException {
    // 创建http POST请求
    HttpPut httpPut = new HttpPut(url);
    httpPut.setConfig(config);
    if (param != null) {
        // 设置post参数
        List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
        for (Map.Entry<String, Object> entry : param.entrySet()) {
            parameters.add(new BasicNameValuePair(entry.getKey(), entry.getValue().toString()));
        }
        // 构造一个form表单式的实体,并且指定参数的编码为UTF-8
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
        // 将请求实体设置到httpPost对象中
        httpPut.setEntity(formEntity);
    }

    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpPut);
        if (response.getEntity() != null) {
            return new HttpResut(response.getStatusLine().getStatusCode(), EntityUtils.toString(
                    response.getEntity(), "UTF-8"));
        }
        return new HttpResut(response.getStatusLine().getStatusCode(), null);
    } finally {
        if (response != null) {
            response.close();
        }
    }
}

/**
 * 执行PUT请求
 * 
 * @param url
 * @return 状态码和请求的body
 * @throws IOException
 */
public HttpResut doPut(String url) throws IOException {
    return this.doPut(url, null);
}

/**
 * 执行DELETE请求,通过POST提交，_method指定真正的请求方法
 * 
 * @param url
 * @param param 请求参数
 * @return 状态码和请求的body
 * @throws IOException
 */
public HttpResut doDelete(String url, Map<String, Object> param) throws Exception {
    param.put("_method", "DELETE");
    return this.dopost(url, param);
}

/**
 * 执行DELETE请求(真正的DELETE请求)
 * 
 * @param url
 * @return 状态码和请求的body
 * @throws IOException
 */
public HttpResut doDelete(String url) throws Exception {
    // 创建http DELETE请求
    HttpDelete httpDelete = new HttpDelete(url);
    httpDelete.setConfig(this.config);
    CloseableHttpResponse response = null;
    try {
        // 执行请求
        response = httpClient.execute(httpDelete);
        if (response.getEntity() != null) {
            return new HttpResut(response.getStatusLine().getStatusCode(), EntityUtils.toString(
                    response.getEntity(), "UTF-8"));
        }
        return new HttpResut(response.getStatusLine().getStatusCode(), null);
    } finally {
        if (response != null) {
            response.close();
        }
    }
}
}