废话不多讲。
下边有三种调用方式。
第一种,GET方式。
第二种,表单提交POST方式(类似前端form表单方式)。
第三种,字符串提交POST方式(参数为String)。
第一种和第二种方式所调用的接口接参方式:传参和接参参数名相同即可。
第三种方式所调用的接口可用@RequestBody注解来接参。
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.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;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* HTTP请求调用工具类
*/
public class HttpUtilZ {
/**
* 第一种,带参数并指定编码GET请求
* @param url 请求地址
* @param param 请求参数
* @param charset 返回值编码集类型
* @return
*/
public static String doGetZ(String url, Map<String, String> param, String charset){
CloseableHttpClient httpClient = HttpClients.createDefault(); //创建CloseableHttpClient对象,用于执行请求
String resultString = ""; //接口返回值
CloseableHttpResponse response = null; //请求执行后返回的信息
try {
URIBuilder builder = new URIBuilder(url); //使url地址转为URIBuilder类型,用于对其内容进行操作
if (param != null) { //判断传参是否为null
for (String key : param.keySet()) { //遍历获取集合中的key值
builder.addParameter(key, param.get(key)); //根据key值或许value值并将两者添加到url连接上
}
}
URI uri = builder.build(); //获取修改后的url(加了传参的url)
HttpGet httpGet = new HttpGet(uri); //创建http GET请求
// 下方一行代码:单位毫秒
// setConnectTimeout()设置连接超时时间,
// setConnectionRequestTimeout()设置从connect Manager获取Connection 超时时间
// setSocketTimeout()设置请求返回超时时间
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(10000).setSocketTimeout(1800000).build();
httpGet.setConfig(requestConfig); //给GET装载配置
response = httpClient.execute(httpGet); //执行请求
if (response.getStatusLine().getStatusCode() == 200) { //获取并判断请求返回状态是否为200
resultString = EntityUtils.toString(response.getEntity(), charset); //获取返回信息并转码
}
} 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GET请求,默认字符集为UTF-8
* @param url
* @return
*/
public static String doGetZ(String url){
return doGetZ(url,null,"UTF-8");
}
/**
* 不带参数,指定返回值编码集类型GET请求
* @param url
* @param charset
* @return
*/
public static String doGetZ(String url, String charset){
return doGetZ(url,null,charset);
}
/**
* 第二种,带参数的post请求(模拟前端表单模式)
* @param url 接口地址
* @param param 传参
* @param charset 传参和返回值编码集类型
* @return
*/
public static String doPostZ(String url, Map<String, String> param, String charset){
CloseableHttpClient httpClient = HttpClients.createDefault(); //创建CloseableHttpClient对象,用于执行请求
CloseableHttpResponse response = null; //接口返回值
String resultString = ""; //请求执行后返回的信息
try {
HttpPost httpPost = new HttpPost(url); // 创建Http Post请求
if (param != null) { //判断传参是否为null
List<NameValuePair> paramList = new ArrayList<>();
for (Map.Entry key : param.entrySet()) {
paramList.add(new BasicNameValuePair(key.getKey().toString(), key.getValue().toString()));
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,charset); //模拟表单,设置传参编码
httpPost.setEntity(entity); //将参数加入请求
}
response = httpClient.execute(httpPost); // 执行http请求
if(charset == null){
charset = "UTF-8";
}
resultString = EntityUtils.toString(response.getEntity(), charset); //接口返回参数
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
/**
* 不带参POST请求,默认字符集为UTF-8
* @param url
* @return
*/
public static String doPostZ(String url){
return doPostZ(url,null,"UTF-8");
}
/**
* 不带参,指定字符集POST请求
* @param url
* @param charset
* @return
*/
public static String doPostZ(String url, String charset){
return doPostZ(url,null,charset);
}
/**
* 第三种,任何字符串格式参数(常用为json格式的字符串当参数)POST请求
* @param url
* @param json
* @param charset
* @return
*/
public static String doPostJson(String url, String json, String charset){
CloseableHttpClient httpClient = HttpClients.createDefault(); //创建CloseableHttpClient对象,用于执行请求
CloseableHttpResponse response = null; //接口返回值
String resultString = ""; //请求执行后返回的信息
try {
HttpPost httpPost = new HttpPost(url); //创建Http Post请求
StringEntity entity = new StringEntity(json,charset); //创建请求内容(添加参数)
httpPost.setEntity(entity); //向请求添加请求内容
response = httpClient.execute(httpPost); // 执行http请求
resultString = EntityUtils.toString(response.getEntity(), charset); //接收返回值
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
}