HttpClient调用

import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
 
import org.apache.http.NameValuePair;
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.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
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;
 
public class HttpClientUtil {
 
/**
 * 带参数的get请求
 * @param url
 * @param param
 * @return String
 */
public static String doGet(String url, Map<String, String> param) {
// 创建Httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
 
String resultString = "";
CloseableHttpResponse response = null;
try {
// 创建uri
URIBuilder builder = new URIBuilder(url);
if (param != null) {
for (String key : param.keySet()) {
builder.addParameter(key, param.get(key));
}
}
URI uri = builder.build();
// 创建http GET请求
HttpGet httpGet = new HttpGet(uri);
// 执行请求
response = httpclient.execute(httpGet);
// 判断返回状态是否为200
if (response.getStatusLine().getStatusCode() == 200) {
resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (response != null) {
response.close();
}
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
  
/**
 * 不带参数的get请求
 * @param url
 * @return String
 */
public static String doGet(String url) {
return doGet(url, null);
}
 
/**
 * 带参数的post请求
 * @param url
 * @param param
 * @return String
 */
public static String doPost(String url, Map<String, String> param) {
// 创建Httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String resultString = "";
try {
// 创建Http Post请求
HttpPost httpPost = new HttpPost(url);
// 创建参数列表
if (param != null) {
List<NameValuePair> paramList = new ArrayList<>();
for (String key : param.keySet()) {
paramList.add(new BasicNameValuePair(key, param.get(key)));
}
// 模拟表单
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
httpPost.setEntity(entity);
}
// 执行http请求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
 
/**
 * 不带参数的post请求
 * @param url
 * @return String
 */
public static String doPost(String url) {
return doPost(url, null);
}
  
/**
 * 传送json类型的post请求
 * @param url
 * @param json
 * @return String
 */
public static String doPostJson(String url, String json) {
// 创建Httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String resultString = "";
try {
// 创建Http Post请求
HttpPost httpPost = new HttpPost(url);
// 创建请求内容
StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
httpPost.setEntity(entity);
// 执行http请求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
}

　　

import java.util.List;
import java.util.Map;
 
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.PropertyFilter;
import com.alibaba.fastjson.serializer.SerializerFeature;
 
/**
 * 在系统中统一使用这个，以方便将来切换不同的JSON生成工具
 * 
 * @author KelvinZ
 * 
 */
public class JsonUtils {
public static final int TYPE_FASTJSON = 0;
public static final int TYPE_GSON = 1;
 
/**
 * <pre>
 * 对象转化为json字符串
 * 
 * @param obj 待转化对象
 * @return 代表该对象的Json字符串
 */
public static final String toJson(final Object obj) {
return JSON.toJSONString(obj);
// return gson.toJson(obj);
}
 
/**
 * <pre>
 * 对象转化为json字符串
 * 
 * @param obj 待转化对象
 * @return 代表该对象的Json字符串
 */
public static final String toJson(final Object obj, SerializerFeature... features) {
return JSON.toJSONString(obj, features);
// return gson.toJson(obj);
}
 
/**
 * 对象转化为json字符串并格式化
 * 
 * @param obj
 * @param format 是否要格式化
 * @return
 */
public static final String toJson(final Object obj, final boolean format) {
return JSON.toJSONString(obj, format);
}
 
/**
 * 对象对指定字段进行过滤处理，生成json字符串
 * 
 * @param obj
 * @param fields 过滤处理字段
 * @param ignore true做忽略处理，false做包含处理
 * @param features json特征，为null忽略
 * @return
 */
public static final String toJson(final Object obj, final String[] fields, final boolean ignore,
SerializerFeature... features) {
if (fields == null || fields.length < 1) {
return toJson(obj);
}
if (features == null)
features = new SerializerFeature[] { SerializerFeature.QuoteFieldNames };
return JSON.toJSONString(obj, new PropertyFilter() {
@Override
public boolean apply(Object object, String name, Object value) {
for (int i = 0; i < fields.length; i++) {
if (name.equals(fields[i])) {
return !ignore;
}
}
return ignore;
}
}, features);
}
 
/**
 * <pre>
 * 解析json字符串中某路径的值
 * 
 * @param json
 * @param path
 * @return
 */
@SuppressWarnings("unchecked")
public static final <E> E parse(final String json, final String path) {
String[] keys = path.split(",");
JSONObject obj = JSON.parseObject(json);
for (int i = 0; i < keys.length - 1; i++) {
obj = obj.getJSONObject(keys[i]);
}
return (E) obj.get(keys[keys.length - 1]);
}
 
/**
 * <pre>
 * json字符串解析为对象
 * 
 * @param json 代表一个对象的Json字符串
 * @param clazz 指定目标对象的类型，即返回对象的类型
 * @return 从json字符串解析出来的对象
 */
public static final <T> T parse(final String json, final Class<T> clazz) {
return JSON.parseObject(json, clazz);
}
 
/**
 * <pre>
 * json字符串解析为对象
 * 
 * @param json json字符串
 * @param path 逗号分隔的json层次结构
 * @param clazz 目标类
 */
public static final <T> T parse(final String json, final String path, final Class<T> clazz) {
String[] keys = path.split(",");
JSONObject obj = JSON.parseObject(json);
for (int i = 0; i < keys.length - 1; i++) {
obj = obj.getJSONObject(keys[i]);
}
String inner = obj.getString(keys[keys.length - 1]);
return parse(inner, clazz);
}
 
/**
 * 将制定的对象经过字段过滤处理后，解析成为json集合
 * 
 * @param obj
 * @param fields
 * @param ignore
 * @param clazz
 * @param features
 * @return
 */
public static final <T> List<T> parseArray(final Object obj, final String[] fields, boolean ignore,
final Class<T> clazz, final SerializerFeature... features) {
String json = toJson(obj, fields, ignore, features);
return parseArray(json, clazz);
}
 
/**
 * <pre>
 * 从json字符串中解析出一个对象的集合，被解析字符串要求是合法的集合类型
 * （形如:["k1":"v1","k2":"v2",..."kn":"vn"]）
 * 
 * @param json - [key-value-pair...]
 * @param clazz
 * @return
 */
public static final <T> List<T> parseArray(final String json, final Class<T> clazz) {
return JSON.parseArray(json, clazz);
}
 
/**
 * <pre>
 * 从json字符串中按照路径寻找，并解析出一个对象的集合，例如：
 * 类Person有一个属性name，要从以下json中解析出其集合：
 * {
 * "page_info":{
 * "items":{
 * "item":[{"name":"KelvinZ"},{"name":"Jobs"},...{"name":"Gates"}]
 * }
 * }
 * 使用方法：parseArray(json, "page_info,items,item", Person.class)，
 * 将根据指定路径，正确的解析出所需集合，排除外层干扰
 * 
 * @param json json字符串
 * @param path 逗号分隔的json层次结构
 * @param clazz 目标类
 * @return
 */
public static final <T> List<T> parseArray(final String json, final String path, final Class<T> clazz) {
String[] keys = path.split(",");
JSONObject obj = JSON.parseObject(json);
for (int i = 0; i < keys.length - 1; i++) {
obj = obj.getJSONObject(keys[i]);
}
String inner = obj.getString(keys[keys.length - 1]);
List<T> ret = parseArray(inner, clazz);
return ret;
}
 
/**
 * <pre>
 * 有些json的常见格式错误这里可以处理，以便给后续的方法处理
 * 常见错误：使用了\" 或者 "{ 或者 }"，腾讯的页面中常见这种格式
 * 
 * @param invalidJson 包含非法格式的json字符串
 * @return
 */
public static final String correctJson(final String invalidJson) {
String content = invalidJson.replace("\\\"", "\"").replace("\"{", "{").replace("}\"", "}");
return content;
}
 
/**
 * 格式化Json
 * 
 * @param json
 * @return
 */
public static final String formatJson(String json) {
Map<?, ?> map = (Map<?, ?>) JSON.parse(json);
return JSON.toJSONString(map, true);
}
 
/**
 * 获取json串中的子json
 * 
 * @param json
 * @param path
 * @return
 */
public static final String getSubJson(String json, String path) {
String[] keys = path.split(",");
JSONObject obj = JSON.parseObject(json);
for (int i = 0; i < keys.length - 1; i++) {
obj = obj.getJSONObject(keys[i]);
System.out.println(obj.toJSONString());
}
return obj != null ? obj.getString(keys[keys.length - 1]) : null;
}
 
}

　原文地址：https://mp.weixin.qq.com/s/5HZtGwpBp5eQRzueZGm6lw

import java.io.IOException;import java.net.URI;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.http.NameValuePair;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.utils.URIBuilder;import org.apache.http.entity.ContentType;import org.apache.http.entity.StringEntity;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;public class HttpClientUtil {/** * 带参数的get请求 * @param url * @param param * @return String */public static String doGet(String url, Map<String, String> param) {// 创建Httpclient对象CloseableHttpClient httpclient = HttpClients.createDefault();String resultString = "";CloseableHttpResponse response = null;try {// 创建uriURIBuilder builder = new URIBuilder(url);if (param != null) {for (String key : param.keySet()) {builder.addParameter(key, param.get(key));}}URI uri = builder.build();// 创建http GET请求HttpGet httpGet = new HttpGet(uri);// 执行请求response = httpclient.execute(httpGet);// 判断返回状态是否为200if (response.getStatusLine().getStatusCode() == 200) {resultString = EntityUtils.toString(response.getEntity(), "UTF-8");}} catch (Exception e) {e.printStackTrace();} finally {try {if (response != null) {response.close();}httpclient.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}/** * 不带参数的get请求 * @param url * @return String */public static String doGet(String url) {return doGet(url, null);}/** * 带参数的post请求 * @param url * @param param * @return String */public static String doPost(String url, Map<String, String> param) {// 创建Httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();CloseableHttpResponse response = null;String resultString = "";try {// 创建Http Post请求HttpPost httpPost = new HttpPost(url);// 创建参数列表if (param != null) {List<NameValuePair> paramList = new ArrayList<>();for (String key : param.keySet()) {paramList.add(new BasicNameValuePair(key, param.get(key)));}// 模拟表单UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);httpPost.setEntity(entity);}// 执行http请求response = httpClient.execute(httpPost);resultString = EntityUtils.toString(response.getEntity(), "utf-8");} catch (Exception e) {e.printStackTrace();} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}/** * 不带参数的post请求 * @param url * @return String */public static String doPost(String url) {return doPost(url, null);}/** * 传送json类型的post请求 * @param url * @param json * @return String */public static String doPostJson(String url, String json) {// 创建Httpclient对象CloseableHttpClient httpClient = HttpClients.createDefault();CloseableHttpResponse response = null;String resultString = "";try {// 创建Http Post请求HttpPost httpPost = new HttpPost(url);// 创建请求内容StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);httpPost.setEntity(entity);// 执行http请求response = httpClient.execute(httpPost);resultString = EntityUtils.toString(response.getEntity(), "utf-8");} catch (Exception e) {e.printStackTrace();} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}}