httpClient入门到精通-------doPost

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最新推荐文章于 2024-03-14 15:33:34 发布

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分类专栏： httpclient

本文链接：https://blog.youkuaiyun.com/lzh657083979/article/details/78821775

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本文提供了使用Apache HttpClient库发送POST请求的两个示例代码：一个是没有携带参数的POST请求，另一个是携带了参数的POST请求。示例展示了如何创建HttpClient实例、设置请求URL及参数，并获取响应。

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doPost无参请求

package cn.itcast.httpclient;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class DoPOST {

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

        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();

        // 创建http POST请求
        HttpPost httpPost = new HttpPost("http://www.oschina.net/");

        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpclient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                String content = EntityUtils.toString(response.getEntity(), "UTF-8");
                System.out.println(content);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        }

    }

}

dopost有参请求

package cn.itcast.httpclient;

import java.util.ArrayList;
import java.util.List;

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.HttpPost;
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;

public class DoPOSTParam {

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

        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();

        // 创建http POST请求
        HttpPost httpPost = new HttpPost("http://www.oschina.net/search");

        // 设置2个post参数，一个是scope、一个是q
        List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
        parameters.add(new BasicNameValuePair("scope", "project"));
        parameters.add(new BasicNameValuePair("q", "java"));
        // 构造一个form表单式的实体
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
        // 将请求实体设置到httpPost对象中
        httpPost.setEntity(formEntity);

        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpclient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                String content = EntityUtils.toString(response.getEntity(), "UTF-8");
                System.out.println(content);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        }

    }

}