Java 实现Http的get和post请求封装类

Java 实现Http的get和post请求封装类

需要引入

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>

package cn.com.weisoft.mvcapp.utils;

import org.apache.http.*;

import org.apache.http.client.HttpClient;

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.entity.StringEntity;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClientBuilder;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.URI;

import java.util.*;

public class HttpUtil {

/**

* get请求

* @return

public static String doGet(String url) {

try {

HttpClient client = HttpClientBuilder.create().build();

//发送get请求

HttpGet request = new HttpGet(url);

HttpResponse response = client.execute(request);

// 请求发送成功，并得到响应

if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

// 读取服务器返回过来的json字符串数据

return EntityUtils.toString(response.getEntity());

}

catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* post请求(用于key-value格式的参数)

* @param url

* @param params

* @return

public static String doPost(String url, Map params){

BufferedReader in = null;

try {

// 定义HttpClient

HttpClient client = HttpClientBuilder.create().build();

// 实例化HTTP方法

HttpPost request = new HttpPost();

request.setURI(new URI(url));

//设置参数

List

for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {

String name = (String) iter.next();

String value = String.valueOf(params.get(name));

nvps.add(new BasicNameValuePair(name, value));

}

request.setEntity(new UrlEncodedFormEntity(nvps, "utf-8"));

HttpResponse response = client.execute(request);

int code = response.getStatusLine().getStatusCode();

// 请求成功

if(200 == code){

in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(),"utf-8"));

StringBuffer sb = new StringBuffer("");

String line = "";

String nL = System.getProperty("line.separator");

while ((line = in.readLine()) != null) {

sb.append(line + nL);

}

in.close();

return sb.toString();

}

else{

System.out.println("状态码：" + code);

return null;

}

catch(Exception e){

e.printStackTrace();

return null;

}

/**

* 数据推送

* post请求（用于请求json格式的参数）

* @param url

* @param params

* @return

public static String doPost(String url, String params) throws Exception {

CloseableHttpClient httpclient = HttpClients.createDefault();

// 创建httpPost

HttpPost httpPost = new HttpPost(url);

httpPost.setHeader("Accept", "application/json");

httpPost.setHeader("Content-Type", "application/json");

String charSet = "UTF-8";

StringEntity entity = new StringEntity(params, charSet);

httpPost.setEntity(entity);

CloseableHttpResponse response = null;

try {

response = httpclient.execute(httpPost);

StatusLine status = response.getStatusLine();

int state = status.getStatusCode();

if (state == HttpStatus.SC_OK) {

HttpEntity responseEntity = response.getEntity();

return EntityUtils.toString(responseEntity);

}

finally {

if (response != null) {

try {

response.close();

} catch (IOException e) {

e.printStackTrace();

}

try {

httpclient.close();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

/**

* 设置http headMap

* @param host

* @param content_type

* @return

public Map

Map

headMap.put("Host",host);

headMap.put("Content_Type",content_type);

return headMap;

}

public Map

Map

if (accessToken != null) {

bodyMap.put("accessToken",accessToken);

}

if (deviceSerial != null) {

bodyMap.put("deviceSerial",deviceSerial);

}

if (validateCode != null) {

bodyMap.put("validateCode",validateCode);

}

return bodyMap;

}