java使用httpclient 发送请求的示例

2023-11-19 14:39 开发作者：有梦想的菜

一、使用的Jar包

首先需要在maven中引入如下包

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.5.13</version>
</dependency>
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>2.0.18</version>
</dependency>

二、接口代码

Get的无参/有参请求

/**
 * @param url     接口地址
 * @param headers 请求头
 * @Description get请求
 */
public static String getData(String url, Map<String, String> headers) {
    String StringResult = "";
    CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
    HttpGet httpGet = new HttpGet(url);
    if (headers != null && !headers.isEmpty()) {
        for (String head : headers.keySet()) {
            httpGet.addHeader(head, headers.get(head));
        }
    }
    CloseableHttpResponse response = null;
    try {
        response = closeableHttpClient.execute(httpGet);
        HttpEntity entity = response.getEntity();
        StringResult = EntityUtils.toString(entity, StandardCharsets.UTF_8).trim();
        EntityUtils.consume(entity);
    } catch (Exception e) {
        e.printStackTrace();
        StringResult = "errorException:" + e.getMessage();
    } finally {
        if (response != null) {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (closeableHttpClient != null) {
            try {
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return StringResult;
}

请求实列：在这里无参请求就yyiNykxZ不展示，可自行试验

Map<String, String> headers = new HashMap<>();
headers.put("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/107.0.0.0 Safari/537.36");
String data = getData("https://api.vvhan.com/api/covid?city=重庆", headers);
System.out.println(data);

请求结果：

{
"success": true,
"data": {
"updatetime": "2022-12-23 09:46:10",
"country": "中国",
"province": "重庆",
"city": "重庆",
"now": {
"sure_new_loc": "未公布",
"sure_new_hid": "未公布",
&qu编程ot;sure_present": 3108
},
"history": {
"sure_cnt": 10452,
"cure_cnt": 7337,
"die_cnt": 7
},
javascript; "danger": {
"high_risk": 0,
"medium_risk": 0
}
}
}

Post请求（application/x-www-form-urlencoded）

/**
 * @param url     接口地址
 * @param list    NameValuePair（简单名称值对节点类型）类似html中的input
 * @param headers 请求头（默认Content-Type：application/x-www-form-urlencoded; charset=UTF-8）
 * @Description post请求
 */
public static String postData(String url, ArrayList<NameValuePair> list, Map<String, String> headers) {
    String StringResult = "";
    CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);
    if (list != null && !list.isEmpty()) {
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(list, Consts.UTF_8);
        httpPost.setEntity(formEntity);
    }
    httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
    if (headers != null && !headers.isEmpty()) {
        for (String head : headers.keySet()) {
            httpPost.addHeader(head, headers.get(head));
        }
    }
    CloseableHttpResponse response = null;
    try {
        response = closeableHttpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        StringResult = EntityUtils.toString(entity, StandardCharsets.UTF_8);
        EntityUtils.consume(entity);
    } catch (Exception e) {
        StringResult = "errorException:" + e.getMessage();
        e.printStackTrace();
    } finally {
        if (response != null) {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (closeableHttpClient != null) {
            try {
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return StringResult;
}

请求实列：

ArrayList<NameValuePair> list = new ArrayList<>();
list.add(new BasicNameValuePair("username", "用户名"));
list.add(new BasicNameValuePair("password", "1234"));
String s = postData("http://127.0.0.1:3000/aaa/file/testPost.JSP", list, javascriptnull);
System.out.println(s);

请求结果：

用户名
1234
application/x-www-form-urlencoded; charset=UTF-8

Post请求（application/json）

/**
 * @param url        接口地址
 * @param jsonString json字符串
 * @param headers    请求头(默认Content-Type：application/json; charset=UTF-8)
 * @Description post Json 请求
 */
public static String postJsonData(String url, @NotNull String jsonString, Map<String, String> headers) {
    String StringResult = "";
    CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);
    StringEntity jsonEntity = new StringEntity(jsonString, Consts.UTF_8);
    jsonEntity.setContentEncoding(Consts.UTF_8.name());
    httpPost.setEntity(jsonEntity);
    httpPost.addHeader("Content-Type", "application/json; charset=UTF-8");
    if (headers != null && !headers.isEmpty()) {
        for (String head : headers.keySet()) {
            httpPost.addHeader(head, headers.get(head));
        }
    }
    CloseableHttpResponse response = null;
    try {
        response = closeableHttpClient.execute(httpPost);
        HttpEntity entity = response.getEntity();
        StringResult = EntityUtils.toString(entity, StandardCharsets.UTF_8);
        EntityUtils.consume(entity);
    } catch (Exception e) {
        StringResult = "errorException:" + e.getMessage();
        e.printStackTrace();
    } finally {
        if (response != null) {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (closeableHttpClient != null) {
            try {
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return StringResult;
}

请求实列：

JSONObject jsonObject = new JSONObject();
jsonObject.put("demo", "456789");
jsonObject.put("demo1", "哈哈哈爱发火");
String s = postJsonData("http://127.0.0.1:3000/api/workflow/v1/insert2", jsonObject.toJSONString(), null);
System.out.println(s);

请求结果：

java使用httpclient 发送请求的示例

Get请求url拼接

/**
 * @param url    接口地址(无参数/有参)
 * @param params 拼接参数集合
 * @Description get请求URL拼接参数 & URL编码
 */
public static String getAppendUrl(String url, Map<String, String> params) {
    StringBuffer buffer = new StringBuffer(url);
    if (params != null && !params.isEmpty()) {
        for (String key : params.keySet()) {
            if (buffer.indexOf("?") >= 0) {
                buffer.append("&");
            } else {
                buffer.append("?");
            }
            String value = "";
            try {
                value = URLEncoder.encode(params.get(key), StandardCharsets.UTF_8.name());
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            buffer.append(key)
                    .append("=")
                    .append(value);
        }
    }
    return buffer.toString();
}

请求实列：

Map<String, String> params = new HashMap<>();
params.put("city", "重庆");
params.put("number", "手机号");
String appendUrl = getAppendUrl("https://TestGetSplice/index", params);
String appendUrl1 = getAppendUrl("https://TestGetSplice/index?a=33", params);
System.out.println(appendUrl);
System.out.println(appendUrl1);

请求结果：

https://TestGetSplice/index?number=%E6%89%8B%E6%9C%BA%E5%8F%B7&city=%E9%87%8D%E5%BA%86
https://TestGetSplice/index?a=33&number=%E6%89%8B%E6%9C%BA%E5%8F%B7&city=%E9%87%8D%E5%BA%86

三、使用的类

import com.alibaba.fastjson.JSONObject;
import com.sun.istack.internal.NotNull;
import org.apache.http.Consts;
import org.apache.http.HttpEntity;
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.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.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

四、标准字符集的常量定义

这些字符集保证在Java平台的每个实现上都可用。

import java.nio.charset.StandardCharsets;
StandardCharsets.UTF_8

五、请求状态常量

import org.apache.http.HttpStatus;
// 200python
HttpStatus.SC_OK

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继续阅读：httpclient 发送请求 httpclient 请求

java使用httpclient 发送请求的示例

目录

一、使用的Jar包

二、接口代码

Get的无参/有参请求

三、使用的类

四、标准字符集的常量定义

五、请求状态常量

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