httpClient工具类

/**
 * 2017年9月6日下午3:38:48
 */
package com.jjmc.utils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
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.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

/**
 *
 * @author huangtao
 * 2017年9月6日下午3:38:48
 * HttpClientTest
 * @parameter
 * TODO
 *
 */
public class HttpClientUtil {
//提交方式
private final static String POST = "post";
private final static String GET = "get";
//默认字符编码
private final static String ENCODING = "UTF-8";
/**
* post提交，指定字符编码
* @param url
* @param params
* @param encoding
* @return
*/
public static String doPost(String url, Map<String, Object> params, String encoding) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost post = new HttpPost(url);
if(params != null) {
//处理参数
HttpEntity entity = handleParam(params, encoding);
//添加参数
post.setEntity(entity);
}
CloseableHttpResponse response = null;
String content = null;
try {
response = httpClient.execute(post);
content = EntityUtils.toString(response.getEntity());
} catch (Exception e) {
e.printStackTrace();
} finally {
close(response, httpClient);
}
return content;
} 
/**
* post提交，使用默认字符编码UTF-8
* @param url
* @param params
* @return
*/
public static String doPost(String url, Map<String, Object> params) {
return doPost(url, params, ENCODING);
}
/**
* get提交，指定字符编码
* @param url
* @param params
* @param encoding
* @return
*/
public static String doGet(String url, Map<String, Object> params, String encoding) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet get = new HttpGet(url);
if(params != null) {
//处理参数
HttpEntity entity = handleParam(params, encoding);
try {
String paramStr = EntityUtils.toString(entity);
get = new HttpGet(url + "?" + paramStr);
} catch (Exception e) {
e.printStackTrace();
return null;
} 
}
CloseableHttpResponse response = null;
String content = null;
try {
response = httpClient.execute(get);
content = EntityUtils.toString(response.getEntity());
} catch (Exception e) {
e.printStackTrace();
} finally {
close(response, httpClient);
}
return content;
}
/**
* get提交，使用默认字符编码UTF-8
* @param url
* @param params
* @return
*/
public static String doGet(String url, Map<String, Object> params) {
return doGet(url, params, ENCODING);
}
/**
* 提交请求，指定字符编码
* @param type
* @param url
* @param params
* @param encoding
* @return
*/
public static String service(String type, String url, Map<String, Object> params, String encoding) {
if(POST.equals(type)) {
return doPost(url, params, encoding);
}else if(GET.equals(type)) {
return doGet(url, params, encoding);
}else {
return null;
}
}
/**
* 提交请求，使用默认字符编码UTF-8
* @param type
* @param url
* @param params
* @return
*/
public static String service(String type, String url, Map<String, Object> params) {
return service(type, url, params, ENCODING);
}
/**
* 处理参数
* @param params
* @return
*/
private static HttpEntity handleParam(Map<String, Object> params, String encoding) {
List<NameValuePair> pList = new ArrayList<NameValuePair>();
Set<String> keys = params.keySet();
for(String key : keys) {
Object value = params.get(key);
try {
//处理数组
Object[] objs = (Object[])value;
for(Object obj : objs) {
pList.add(new BasicNameValuePair(key, obj.toString()));
}
}catch(Exception e) {
//处理普通类型
pList.add(new BasicNameValuePair(key, value.toString()));
}
}
UrlEncodedFormEntity uefEntity = null;
try {
uefEntity = new UrlEncodedFormEntity(pList, encoding);
} catch (Exception e) {
e.printStackTrace();
}
return uefEntity;
}
/**
* 关闭
* @param response
* @param httpClient
*/
private static void close(CloseableHttpResponse response, CloseableHttpClient httpClient) {
try{
if(response != null) {
response.close();
}
if(httpClient != null) {
httpClient.close();
}
}catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws ParseException, IOException {
Map<String, Object> params = new HashMap<String, Object>();
params.put("name", "张");
String content = doPost("http://127.0.0.1:8080/xxxxx/xxxxx", null);
System.out.println(content);
}

}