ORG.APACHE.HTTPCOMPONENTS HTTPCLIENT 发起HTTP JSON请求

最新推荐文章于 2025-06-02 13:00:28 发布

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本文介绍了一个使用Apache HttpClient库实现的Java HTTP客户端，包括GET和POST请求的发送，以及JSON数据的POST提交。代码展示了如何设置请求头，处理响应实体，并进行错误处理。

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1. pom.xml

<dependency>

<groupId>org.apache.httpcomponents</groupId>

<artifactId>httpclient</artifactId>

<version>4.5.3</version>

</dependency>

2. HttpClient.java

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package com.midea.clean.util;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import java.util.Set;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.ParseException;

import org.apache.http.client.ClientProtocolException;

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.methods.HttpUriRequest;

import org.apache.http.entity.StringEntity;

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

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

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

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.protocol.HTTP;

import org.apache.http.util.EntityUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import com.alibaba.fastjson.JSONObject;

import com.midea.clean.bo.UserBo;

public class HttpClient {

private static final Logger LOGGER = LoggerFactory.getLogger(HttpClient.class);

/**

* 发送post请求

* @param url

* @param params

* @return

*/

public static String post(String url, Map<String, String> params) {

DefaultHttpClient httpclient = new DefaultHttpClient();

String body = null;

HttpPost post = postForm(url, params);

body = invoke(httpclient, post);

httpclient.getConnectionManager().shutdown();

return body;

}

/**

* 发送get请求

* @param url

* @return

*/

public static String get(String url) {

DefaultHttpClient httpclient = new DefaultHttpClient();

String body = null;

HttpGet get = new HttpGet(url);

body = invoke(httpclient, get);

httpclient.getConnectionManager().shutdown();

return body;

}

private static String invoke(DefaultHttpClient httpclient, HttpUriRequest httpost) {

HttpResponse response = sendRequest(httpclient, httpost);

String body = paseResponse(response);

return body;

}

private static String paseResponse(HttpResponse response) {

HttpEntity entity = response.getEntity();

String charset = EntityUtils.getContentCharSet(entity);

String body = null;

try {

body = EntityUtils.toString(entity);

} catch (ParseException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return body;

}

private static HttpResponse sendRequest(DefaultHttpClient httpclient, HttpUriRequest httpost) {

HttpResponse response = null;

try {

response = httpclient.execute(httpost);

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return response;

}

private static HttpPost postForm(String url, Map<String, String> params) {

HttpPost httpost = new HttpPost(url);

List<NameValuePair> nvps = new ArrayList<NameValuePair>();

// 需要传一个token

//httpost.setHeader("token", "c7a4e021-6527-11e6-96be-fcaa14c3021a1");

Set<String> keySet = params.keySet();

for (String key : keySet) {

nvps.add(new BasicNameValuePair(key, params.get(key)));

}

try {

httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

return httpost;

}

/**

* post方式提交json代码

* @throws Exception

*/

public static String postJson(String url,String json) throws Exception{

//创建默认的httpClient实例.

CloseableHttpClient httpclient = null;

//接收响应结果

CloseableHttpResponse response = null;

String result = "";

//创建httppost

httpclient = HttpClients.createDefault();

HttpPost httpPost = new HttpPost(url);

httpPost.addHeader(HTTP.CONTENT_TYPE,"application/json");

//参数

StringEntity se = new StringEntity(json);

se.setContentEncoding("UTF-8");

se.setContentType("application/json");//发送json需要设置contentType

httpPost.setEntity(se);

LOGGER.debug("http post url:{},json:{}",url,json);

response = httpclient.execute(httpPost);

LOGGER.debug("http post result:{}", response);

//解析返结果

HttpEntity entity = response.getEntity();

if(entity != null){

result = EntityUtils.toString(entity, "UTF-8");

}

httpclient.close();

response.close();

return result;

}

public static void main(String[] args) throws Exception {

// HttpClient.get("http://localhost/clean/4a/welcome");

// Map<String,String> params = new HashMap<String,String>();

// params.put("empName", "1");

// params.put("empCode", "2");

// HttpClient.post("http://localhost/clean/4a/privilege/check", params);

UserBo userBo = new UserBo();

userBo.setEmpCode("3");

userBo.setEmpName("zs");

userBo.setErpUid("4");

userBo.setMip("5");

String jsonStr = JSONObject.toJSONString(userBo);

HttpClient.postJson("http://localhost/clean/4a/privilege/check", jsonStr);

}