HttpClient模拟get，post请求并发送请求参数（json等）

Posted 2020-07-05 小甲鱼

import java.io.IOException;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
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;

/**
 * 
 */
public class HttpClientUtil {

  public static void main(String arg[]) throws Exception {
    String url = "test.com";
    JSONObject params = new JSONObject();
    params.put("SRC_STM_CODE", "wsf");
    params.put("TENANT_ID", "123");
    params.put("NM", "张三");
    params.put("BRTH_DT", "1983-01-20");
    params.put("GND_CODE", "1");
    JSONArray params2 = new JSONArray();
    JSONObject param3 = new JSONObject();
    param3.put("DOC_TP_CODE", "10100");
    param3.put("DOC_NBR", "100200198301202210");
    param3.put("DOC_CUST_NM", "test");
    params2.add(param3);
    params.put("DOCS", params2);
    String ret = doPost(url, params).toString();
    System.out.println(ret);
  }

  /**
   httpClient的get请求方式2
   * @return
   * @throws Exception
   */
  public static String doGet(String url, String charset)
      throws Exception {
    /*
     * 使用 GetMethod 来访问一个 URL 对应的网页,实现步骤: 1:生成一个 HttpClinet 对象并设置相应的参数。
     * 2:生成一个 GetMethod 对象并设置响应的参数。 3:用 HttpClinet 生成的对象来执行 GetMethod 生成的Get
     * 方法。 4:处理响应状态码。 5:若响应正常，处理 HTTP 响应内容。 6:释放连接。
     */
    /* 1 生成 HttpClinet 对象并设置参数 */
    HttpClient httpClient = new HttpClient();
    // 设置 Http 连接超时为5秒
    httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(5000);
    /* 2 生成 GetMethod 对象并设置参数 */
    GetMethod getMethod = new GetMethod(url);
    // 设置 get 请求超时为 5 秒
    getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 5000);
    // 设置请求重试处理，用的是默认的重试处理：请求三次
    getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,	new DefaultHttpMethodRetryHandler());
    String response = "";
    /* 3 执行 HTTP GET 请求 */
    try {
      int statusCode = httpClient.executeMethod(getMethod);
      /* 4 判断访问的状态码 */
      if (statusCode != HttpStatus.SC_OK) {
        System.err.println("请求出错: "+ getMethod.getStatusLine());
      }
      /* 5 处理 HTTP 响应内容 */
      // HTTP响应头部信息，这里简单打印
      Header[] headers = getMethod.getResponseHeaders();
      for (Header h : headers)
        System.out.println(h.getName() + "------------ " + h.getValue());
      // 读取 HTTP 响应内容，这里简单打印网页内容
      byte[] responseBody = getMethod.getResponseBody();// 读取为字节数组
      response = new String(responseBody, charset);
      System.out.println("----------response:" + response);
      // 读取为 InputStream，在网页内容数据量大时候推荐使用
      // InputStream response = getMethod.getResponseBodyAsStream();
    } catch (HttpException e) {
      // 发生致命的异常，可能是协议不对或者返回的内容有问题
      System.out.println("请检查输入的URL!");
      e.printStackTrace();
    } catch (IOException e) {
      // 发生网络异常
      System.out.println("发生网络异常!");
      e.printStackTrace();
    } finally {
      /* 6 .释放连接 */
      getMethod.releaseConnection();
    }
    return response;
  }

  /**
   * post请求
   * @param url
   * @param json
   * @return
   */
  
  public static JSONObject doPost(String url,JSONObject json){
    DefaultHttpClient client = new DefaultHttpClient();
    HttpPost post = new HttpPost(url);
    JSONObject response = null;
    try {
      StringEntity s = new StringEntity(json.toString());
      s.setContentEncoding("UTF-8");
      s.setContentType("application/json");//发送json数据需要设置contentType
      post.setEntity(s);
      HttpResponse res = client.execute(post);
      if(res.getStatusLine().getStatusCode() == HttpStatus.SC_OK){
        HttpEntity entity = res.getEntity();
        String result = EntityUtils.toString(res.getEntity());// 返回json格式：
        response = JSONObject.fromObject(result);
      }
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
    return response;
  }


}