第一步引入http依赖
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.0-rc4</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
第二步创建工具类
package com.len.utils;
import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
/**
* @Author ful
* @Description:
* @Date in 16:11 2018/10/17
* @Modify By:
*/
public class HttpUtils {
private static ObjectMapper objectMapper = new ObjectMapper();
public static Map<String,Object> httpGet(String url, Map<String, String> parameters) {
String result="";
BufferedReader in = null;// 读取响应输入流
StringBuffer sb = new StringBuffer();// 存储参数
String params = "";// 编码之后的参数
try {
// 编码请求参数
if(parameters.size()==1){
for(String name:parameters.keySet()){
sb.append(name).append("=").append(
java.net.URLEncoder.encode(parameters.get(name),
"UTF-8"));
}
params=sb.toString();
}else{
for (String name : parameters.keySet()) {
sb.append(name).append("=").append(
java.net.URLEncoder.encode(parameters.get(name),
"UTF-8")).append("&");
}
String temp_params = sb.toString();
params = temp_params.substring(0, temp_params.length() - 1);
}
String full_url = url + "?" + params;
System.out.println(full_url);
// 创建URL对象
URL connURL = new URL(full_url);
// 打开URL连接
HttpURLConnection httpConn = (HttpURLConnection) connURL
.openConnection();
// 设置通用属性
httpConn.setRequestProperty("Accept", "*/*");
httpConn.setRequestProperty("Connection", "Keep-Alive");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
// 建立实际的连接
httpConn.connect();
// 响应头部获取
Map<String, List<String>> headers = httpConn.getHeaderFields();
// 遍历所有的响应头字段
for (String key : headers.keySet()) {
System.out.println(key + "\t：\t" + headers.get(key));
}
// 定义BufferedReader输入流来读取URL的响应,并设置编码方式
in = new BufferedReader(new InputStreamReader(httpConn
.getInputStream(), "UTF-8"));
String line;
// 读取返回的内容
while ((line = in.readLine()) != null) {
result +=line;
}
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
Map<String,Object> result_map = JSON.parseObject(result);
return result_map ;
}
/**
* http请求工具类，post请求
*
* @param url url
* @param params 参数值 仅支持String和list两种类型
* @return
* @throws Exception
*/
public static Map<String,Object> httpPost(String url, Map<String, Object> params) {
DefaultHttpClient defaultHttpClient = null;
BufferedReader bufferedReader = null;
try {
defaultHttpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setHeader("Content-Type", "application/json;charset=ut-8");
if (params != null) {
//转换为json格式并打印，不需要的你们可以不要
String jsonParams = objectMapper.writeValueAsString(params);
HttpEntity httpEntity = new StringEntity(jsonParams, "utf-8");
httpPost.setEntity(httpEntity);
}
HttpResponse httpResponse = defaultHttpClient.execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() != 200) {
String errorLog="请求失败，errorCode:"+httpResponse.getStatusLine().getStatusCode();
}
//读取返回信息
String output;
bufferedReader=new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent(),"utf-8"));
StringBuilder stringBuilder=new StringBuilder();
while ((output=bufferedReader.readLine())!=null){
stringBuilder.append(output);
}
Map<String,Object> result_map = JSON.parseObject(stringBuilder.toString());
return result_map;
} catch (ClientProtocolException e) {
e.printStackTrace();
return null;
}catch (IOException e){
e.printStackTrace();
return null;
}finally {
if(defaultHttpClient!=null)
defaultHttpClient.getConnectionManager().shutdown();
if(bufferedReader!=null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}