HttpClientUtil 开发

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本文介绍了一个实用的HTTP客户端工具类，支持GET、POST、PUT和DELETE等HTTP方法，并能够发送JSON格式的数据。该工具类使用了Apache HttpClient库，提供了灵活的参数配置选项，如设置超时时间和身份验证。

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import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
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.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.alibaba.fastjson.JSON;

public class HttpClientUtil {

private static final CloseableHttpClient httpClient;

public static final String CHARSET = "UTF-8";

static {
RequestConfig config = RequestConfig.custom().setConnectTimeout(5000).setSocketTimeout(15000).build();
httpClient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
}

public static String doGet(String url, Map<String, String> params,String authority) {
return doGet(url, params, CHARSET,authority);
}

public static String doPost(String url, Map<String, Object> params,String authority) {
return doPost(url, params, CHARSET,authority);
}

public static String doPostWithJSON(String url, Object params,String authority) throws Exception {
return doPostWithJSON(url, params, CHARSET,authority);
}

public static String doPutWithJSON(String url, Object params,String authority) throws Exception {
return doPutWithJSON(url, params, CHARSET,authority);
}

public static String doDeleteWithJSON(String url, Object params,String authority) throws Exception {
return doDeleteWithJSON(url, params, CHARSET,authority);
}

/**
* Get 获取内容
* @param url 请求的url地址
* @param params 请求的参数
* @param charset 编码格式
* @param authority 授权身份认证可为空
* @return 页面内容
* @author wangaz
* @Date 2018年9月18日下午2:43:13
*/
public static String doGet(String url, Map<String, String> params, String charset,String authority) {
if (StringUtils.isBlank(url)) {
return null;
}
try {
if (params != null && !params.isEmpty()) {
List<NameValuePair> pairs = new ArrayList<NameValuePair>(params.size());
for (Map.Entry<String, String> entry : params.entrySet()) {
String value = entry.getValue();
if (value != null) {
pairs.add(new BasicNameValuePair(entry.getKey(), value));
}
}
url += "?" + EntityUtils.toString(new UrlEncodedFormEntity(pairs, charset));
}
HttpGet httpGet = new HttpGet(url);
if (StringUtil.isEmpty(authority)) {
httpGet.setHeader("Authority", authority);
}
CloseableHttpResponse response = httpClient.execute(httpGet);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
httpGet.abort();
throw new RuntimeException("HttpClient,error status code :" + statusCode);
}
HttpEntity entity = response.getEntity();
String result = null;
if (entity != null) {
result = EntityUtils.toString(entity, "utf-8");
}
EntityUtils.consume(entity);
response.close();
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

/**
* HTTP Post 获取内容
* @param url 请求的url地址
* @param params
* @param charset
* @param authority
* @return
* @author wangaz
* @Date 2018年9月18日下午2:45:03
*/
public static String doPost(String url, Map<String, Object> params, String charset,String authority) {
if (StringUtils.isBlank(url)) {
return null;
}
try {
List<NameValuePair> pairs = null;
if (params != null && !params.isEmpty()) {
pairs = new ArrayList<>(params.size());
for (Map.Entry<String, Object> entry : params.entrySet()) {
String value = String.valueOf(entry.getValue());
if (value != null) {
pairs.add(new BasicNameValuePair(entry.getKey(), value));
}
}
}
HttpPost httpPost = new HttpPost(url);
if (StringUtil.isEmpty(authority)) {
httpPost.setHeader("Authority", authority);
}
if (pairs != null && pairs.size() > 0) {
httpPost.setEntity(new UrlEncodedFormEntity(pairs, CHARSET));
}
CloseableHttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
httpPost.abort();
throw new RuntimeException("HttpClient,error status code :" + statusCode);
}
HttpEntity entity = response.getEntity();
String result = null;
if (entity != null) {
result = EntityUtils.toString(entity, "utf-8");
}
EntityUtils.consume(entity);
response.close();
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

/**
*
* @param url
* @param params
* @param charset
* @param authority
* @return
* @throws Exception
* @author wangaz
* @Date 2018年9月18日下午2:45:23
*/
public static String doPostWithJSON(String url, Object params, String charset,String authority) throws Exception {
HttpPost httpPost = new HttpPost(url);

StringEntity entity = new StringEntity(JSON.toJSONString(params), charset);
entity.setContentEncoding(charset);
entity.setContentType("application/json");
httpPost.setEntity(entity);
if (StringUtil.isEmpty(authority)) {
httpPost.setHeader("Authority", authority);
}

HttpResponse response = httpClient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
httpPost.abort();
throw new RuntimeException("HttpClient,error status code :" + statusCode);
}
HttpEntity responseEntity = response.getEntity();
String respContent = EntityUtils.toString(responseEntity, charset);
return respContent;
}

/**
*
* @param url
* @param params
* @param charset
* @param authority
* @return
* @throws Exception
* @author wangaz
* @Date 2018年9月18日下午2:45:35
*/
public static String doPutWithJSON(String url, Object params, String charset,String authority) throws Exception {
HttpPut httpPut = new HttpPut(url);

StringEntity entity = new StringEntity(JSON.toJSONString(params), charset);
entity.setContentEncoding(charset);
entity.setContentType("application/json");
httpPut.setEntity(entity);
if (StringUtil.isEmpty(authority)) {
httpPut.setHeader("Authority", authority);
}
HttpResponse response = httpClient.execute(httpPut);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
httpPut.abort();
throw new RuntimeException("HttpClient,error status code :" + statusCode);
}
HttpEntity responseEntity = response.getEntity();
String respContent = EntityUtils.toString(responseEntity, charset);
return respContent;
}

/**
*
* @param url
* @param params
* @param charset
* @param authority
* @return
* @throws Exception
* @author wangaz
* @Date 2018年9月18日下午2:45:41
*/
public static String doDeleteWithJSON(String url, Object params, String charset,String authority) throws Exception {
/**
* 没有现成的delete可以带json的，自己实现一个，参考HttpPost的实现
*/
class HttpDeleteWithBody extends HttpEntityEnclosingRequestBase {
public static final String METHOD_NAME = "DELETE";

@SuppressWarnings("unused")
public HttpDeleteWithBody() {
}

@SuppressWarnings("unused")
public HttpDeleteWithBody(URI uri) {
setURI(uri);
}

public HttpDeleteWithBody(String uri) {
setURI(URI.create(uri));
}

public String getMethod() {
return METHOD_NAME;
}
}
HttpDeleteWithBody httpDelete = new HttpDeleteWithBody(url);

StringEntity entity = new StringEntity(JSON.toJSONString(params), charset);
entity.setContentEncoding(charset);
entity.setContentType("application/json");
httpDelete.setEntity(entity);
if (StringUtil.isEmpty(authority)) {
httpDelete.setHeader("Authority", authority);
}
HttpResponse response = httpClient.execute(httpDelete);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200) {
httpDelete.abort();
throw new RuntimeException("HttpClient,error status code :" + statusCode);
}
HttpEntity responseEntity = response.getEntity();
String respContent = EntityUtils.toString(responseEntity, charset);
return respContent;
}