持续创作，加速成长！这是我参与「掘金日新计划 · 6 月更文挑战」的第5天，点击查看活动详情
1、前言
之前在一个项目中，发现有一些功能需要通过http请求三方接口。然后发现里面自定义的的http工具类，每次请求都会新建一个HttpClient对象，造成了非常严重的资源浪费。一到线上并发量大的时候，功能就会出现一些卡顿情况。这里引入了线程池对其改造，同时将原有工具类废弃掉。
2、废弃旧的工具类
/**
* 因 HttpRequestUtil 中未使用线程池，影响性能，已弃用，改用HttpRequestPoolUtil
* @deprecated Use
* {@link HttpRequestPoolUtil},
*
*/
@Deprecated
public class HttpRequestUtil {
}
将@Deprecated写到类上就可实现对类的废弃，同时还要写清楚废弃原因并指明新的工具类。再使用旧的工具类时就会出现如下的提示效果：
3、改造Http工具类，引入线程池
/**
* httpclient连接池工具类
* **/
public class HttpRequestPoolUtil {
private static PoolingHttpClientConnectionManager cm;
private static String EMPTY_STR = "";
private static String UTF_8 = "UTF-8";
private static RequestConfig requestConfig;
private static void init() {
if (cm == null) {
synchronized(HttpRequestPoolUtil.class) {
if (cm == null) {
cm = new PoolingHttpClientConnectionManager();
// 整个连接池最大连接数
cm.setMaxTotal(1000);
// 每路由最大连接数，默认值是2
cm.setDefaultMaxPerRoute(200);
}
}
}
}
/**
* 请求配置文件
*/
private static RequestConfig createRequestConfig() {
if (requestConfig == null) {
try {
requestConfig = RequestConfig.custom()
.setConnectTimeout(Integer.parseInt("1000"))// 设置客户端发起TCP连接请求的超时时间，单位毫秒
.setConnectionRequestTimeout(Integer.parseInt("3000")) // 设置客户端从连接池获取链接的超时时间
.setSocketTimeout(Integer.parseInt("5000"))// 设置客户端等待服务端返回数据的超时时间，单位毫秒。
.build();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return requestConfig;
}
/**
* 通过连接池获取HttpClient
*
* @return
*/
private static CloseableHttpClient getHttpClient() {
init();
return HttpClients.custom().setConnectionManager(cm).build();
}
/**
* @param url
* @return
*/
public static String httpGetRequest(String url) {
HttpGet httpGet = new HttpGet(url);
httpGet.setConfig(createRequestConfig());
return getResult(httpGet);
}
public static String httpGetRequest(String url, Map<String, Object> params) throws URISyntaxException {
URIBuilder ub = new URIBuilder(url);
ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
ub.setParameters(pairs);
HttpGet httpGet = new HttpGet(ub.build());
httpGet.setConfig(createRequestConfig());
return getResult(httpGet);
}
public static String httpGetRequest(String url, Map<String, Object> headers, Map<String, Object> params)
throws URISyntaxException {
URIBuilder ub = new URIBuilder();
ub.setPath(url);
ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
ub.setParameters(pairs);
HttpGet httpGet = new HttpGet(ub.build());
httpGet.setConfig(createRequestConfig());
for (Map.Entry<String, Object> param : headers.entrySet()) {
httpGet.addHeader(param.getKey(), String.valueOf(param.getValue()));
}
return getResult(httpGet);
}
public static String httpPostRequest(String url) {
HttpPost httpPost = new HttpPost(url);
httpPost.setConfig(createRequestConfig());
return getResult(httpPost);
}
public static String httpPostRequest(String url,String json) {
HttpPost httpPost = new HttpPost(url);
StringEntity entity = new StringEntity(json,"utf-8");//解决中文乱码问题
entity.setContentEncoding("UTF-8");
entity.setContentType("application/json");
httpPost.setEntity(entity);
httpPost.setConfig(createRequestConfig());
return getResult(httpPost);
}
public static String httpPostRawJsonRequest(String url, Map<String, Object> headers, Map<String, Object> params) throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
String jsonStr = JSON.toJSONString(params);
//设置请求体参数
StringEntity entity = new StringEntity(jsonStr,"utf-8");
httpPost.setEntity(entity);
httpPost.setConfig(createRequestConfig());
for (Map.Entry<String, Object> param : headers.entrySet()) {
httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
}
return getResult(httpPost);
}
public static String httpPostRequest(String url, Map<String, Object> params) throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
httpPost.setConfig(createRequestConfig());
return getResult(httpPost);
}
public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)
throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
httpPost.setConfig(createRequestConfig());
for (Map.Entry<String, Object> param : headers.entrySet()) {
httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
}
ArrayList<NameValuePair> pairs = covertParams2NVPS(params);
httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
return getResult(httpPost);
}
private static ArrayList<NameValuePair> covertParams2NVPS(Map<String, Object> params) {
ArrayList<NameValuePair> pairs = new ArrayList<NameValuePair>();
for (Map.Entry<String, Object> param : params.entrySet()) {
pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
}
return pairs;
}
public static String doPost(String url, Map<String, Object> map,Map<String, String> header) throws Exception {
// 声明httpPost请求
HttpPost httpPost = new HttpPost(url);
// 加入配置信息
httpPost.setConfig(createRequestConfig());
//设置Header
for (Map.Entry<String, String> cmap :header.entrySet()){
httpPost.addHeader(cmap.getKey(),cmap.getValue());
}
httpPost.addHeader("Content-Type", "application/json;charset=utf-8");
// 判断map是否为空，不为空则进行遍历，封装from表单对象
if (map != null) {
//body里添加参数,使用这种方式
JSONObject jsonObject = new JSONObject(map);
// 把表单放到post里
httpPost.setEntity(new StringEntity(jsonObject.toJSONString()));
}
// 发起请求
return getResult(httpPost);
}
/**
* 处理Http请求
*/
private static String getResult(HttpRequestBase request) {
// CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpClient httpClient = getHttpClient();
CloseableHttpResponse response = null;
String result ="";
try {
response = httpClient.execute(request);
// response.getStatusLine().getStatusCode();
HttpEntity entity = response.getEntity();
if (entity != null) {
// long len = entity.getContentLength();// -1 表示长度未知
result = EntityUtils.toString(entity);
//response.close();
// httpClient.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
//5.回收链接到连接池
if (null != response) {
try {
EntityUtils.consume(response.getEntity());
} catch (IOException e) {
e.printStackTrace();
}
}
return result;
}
}
}
好了、本期就先介绍到这里，有什么需要交流的，大家可以随时私信我。😊
