HttpClientTutorial.java
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package com.rnt.utils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSONObject;
public class HttpClientTutorial {
private static PoolingHttpClientConnectionManager cm;
private static String EMPTY_STR = "";
private static String UTF_8 = "UTF-8";
private static void init() {
if (cm == null) {
cm = new PoolingHttpClientConnectionManager();
cm.setMaxTotal(50);// 整个连接池最大连接数
cm.setDefaultMaxPerRoute(5);// 每路由最大连接数，默认值是2
}
}
/**
* 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);
return getResult(httpGet);
}
public static String httpGetRequest(String url, 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());
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());
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);
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));
return getResult(httpPost);
}
public static String httpPostRequest(String url, JSONObject jsonParam) throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
if (null != jsonParam) {
//解决中文乱码问题
StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8");
entity.setContentEncoding("UTF-8");
entity.setContentType("application/json");
httpPost.setEntity(entity);
}
return getResult(httpPost);
}
public static String httpPostRequest(String url, Map<String, Object> headers, Map<String, Object> params)
throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
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;
}
/**
* 处理Http请求
*
* @param request
* @return
*/
private static String getResult(HttpRequestBase request) {
// CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpClient httpClient = getHttpClient();
try {
CloseableHttpResponse 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
String result = EntityUtils.toString(entity);
response.close();
// httpClient.close();
return result;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
return EMPTY_STR;
}
}