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如何利用HttpUtils发送一个http请求？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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上代码
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
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.pingan.qhcs.map.audit.constant.CodeConstant;
import com.pingan.qhcs.map.audit.exception.MapException;
public class HttpClientUtil {
protected static Log logger = LogFactory.getLog(HttpClientUtil.class);
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
*/
public static CloseableHttpClient getHttpClient() {
init();
return HttpClients.custom().setConnectionManager(cm).build();
}
public static String httpGetRequest(String url) {
HttpGet httpGet = new HttpGet(url);
return getResult(httpGet);
}
public static String httpGetRequest(String url, Map params) throws URISyntaxException {
URIBuilder ub = new URIBuilder();
ub.setPath(url);
ArrayList pairs = covertParams2Nvps(params);
ub.setParameters(pairs);
HttpGet httpGet = new HttpGet(ub.build());
return getResult(httpGet);
}
public static String httpGetRequest(String url, Map headers, Map params)
throws URISyntaxException {
URIBuilder ub = new URIBuilder();
ub.setPath(url);
ArrayList pairs = covertParams2NVPS(params);
ub.setParameters(pairs);
HttpGet httpGet = new HttpGet(ub.build());
for (Map.Entry 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 params) throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
ArrayList pairs = covertParams2NVPS(params);
httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
return getResult(httpPost);
}
public static String httpPostRequest(String url, Map headers, Map params)
throws UnsupportedEncodingException {
HttpPost httpPost = new HttpPost(url);
for (Map.Entry param : headers.entrySet()) {
httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
}
ArrayList pairs = covertParams2NVPS(params);
httpPost.setEntity(new UrlEncodedFormEntity(pairs, UTF_8));
return getResult(httpPost);
}
public static String httpPostRequest(String url, Map headers, String strBody)
throws Exception {
HttpPost httpPost = new HttpPost(url);
for (Map.Entry param : headers.entrySet()) {
httpPost.addHeader(param.getKey(), String.valueOf(param.getValue()));
}
httpPost.setEntity(new StringEntity(strBody, UTF_8));
return getResult(httpPost);
}
private static ArrayList covertParams2NVPS(Map params) {
ArrayList pairs = new ArrayList();
for (Map.Entry param : params.entrySet()) {
pairs.add(new BasicNameValuePair(param.getKey(), String.valueOf(param.getValue())));
}
return pairs;
}
/**
* 处理Http请求
*
* setConnectTimeout：设置连接超时时间，单位毫秒。
* setConnectionRequestTimeout：设置从connect Manager获取Connection 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
* setSocketTimeout：请求获取数据的超时时间，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
*
* @param request
* @return
*/
private static String getResult(HttpRequestBase request) {
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(60000)
.setConnectionRequestTimeout(5000).setSocketTimeout(60000).build();
request.setConfig(requestConfig);// 设置请求和传输超时时间
// CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpClient httpClient = getHttpClient();
try {
CloseableHttpResponse response = httpClient.execute(request); //执行请求
// 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) {
logger.error("[maperror] HttpClientUtil ClientProtocolException : " + e.getMessage());
throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil ClientProtocolException ：" + e.getMessage());
} catch (IOException e) {
logger.error("[maperror] HttpClientUtil IOException : " + e.getMessage());
throw new MapException(CodeConstant.CODE_CONNECT_FAIL, "HttpClientUtil IOException ：" + e.getMessage());
} finally {
}
return EMPTY_STR;
}
} 看完上述内容，你们掌握如何利用HttpUtils发送一个http请求的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！