通用httpclient工具类

最新推荐文章于 2024-07-26 03:20:01 发布

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最新推荐文章于 2024-07-26 03:20:01 发布

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本文链接：https://blog.youkuaiyun.com/z19530/article/details/111641378

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该博客介绍了如何使用Apache HttpClient库执行HTTP POST请求，并传递JSON数据。通过示例代码展示了设置请求头、构造JSON实体以及解析响应内容的过程。此内容对于理解和实践HTTP客户端编程具有指导意义。

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import net.sf.json.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;

import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;


public class HTTPClientUtil {

    private static Logger logger = LoggerFactory.getLogger(HTTPClientUtil.class);


    /**
     * 向指定URL发送GET方法的请求
     * @param url 发送请求的URL
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url) {
        String result = "";
        BufferedReader in = null;
        try {

            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
    public static String doPost(String url, JSONObject jsonData) {
        // 指定Post请求
        HttpPost httpPost = new HttpPost(url);
        // 创建httpclient
        HttpClient httpClient = new DefaultHttpClient();
        // 发送请求
        HttpResponse httpResponse;
        // 返回的json
        String jsonObject = null;
        // 封装post请求数据
        StringEntity entity = new StringEntity(jsonData.toString(), "utf-8");
        httpPost.setEntity(entity);
        try {
            // 发送请求
            httpResponse = httpClient.execute(httpPost);
            // 判断请求是否成功
            if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
                // 得到请求响应信息
                String str = EntityUtils.toString(httpResponse.getEntity(), "utf-8");
                // 返回json
              return str;
            }
        } catch (ClientProtocolException e) {

            e.printStackTrace();
        } catch (IOException e) {

            e.printStackTrace();
        }
        return jsonObject;
    }

}