HttpClient4使用(模拟登陆)

Bertha 。 2022-07-13 05:26 45阅读 0赞

# HttpClient4使用(模拟登陆) #

1。需要导入的jar包  
![这里写图片描述][SouthEast]

2实例代码：

package main;
    
    import java.io.IOException;
    import java.io.UnsupportedEncodingException;
    import java.net.URI;
    import java.net.URISyntaxException;
    import java.util.ArrayList;
    import java.util.List;
    
    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.HttpClient;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.HttpGet;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.util.EntityUtils;
    
    public class Main { 
    
        private static HttpClient hc = new DefaultHttpClient();
    
        /** * @param args */
        public static void main(String[] args) {
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("email", "xxx@gmail.com"));
            params.add(new BasicNameValuePair("pwd", "xxx"));
            params.add(new BasicNameValuePair("save_login", "1"));
    
            String url = "http://www.oschina.net/action/user/login";
    
            String body = post(url, params);
            System.out.println(body);
        }
    
        /** * Get请求 * @param url * @param params * @return */
        public static String get(String url, List<NameValuePair> params) {
            String body = null;
            try {
                // Get请求
                HttpGet httpget = new HttpGet(url);
                // 设置参数
                String str = EntityUtils.toString(new UrlEncodedFormEntity(params));
                httpget.setURI(new URI(httpget.getURI().toString() + "?" + str));
                // 发送请求
                HttpResponse httpresponse = hc.execute(httpget);
                // 获取返回数据
                HttpEntity entity = httpresponse.getEntity();
                body = EntityUtils.toString(entity);
                if (entity != null) {
                    entity.consumeContent();
                }
            } catch (ParseException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (URISyntaxException e) {
                e.printStackTrace();
            }
            return body;
        }
    
        /** * // Post请求 * @param url * @param params * @return */
        public static String post(String url, List<NameValuePair> params) {
            String body = null;
            try {
                // Post请求
                HttpPost httppost = new HttpPost(url);
                // 设置参数
                httppost.setEntity(new UrlEncodedFormEntity(params));
                // 发送请求
                HttpResponse httpresponse = hc.execute(httppost);
                // 获取返回数据
                HttpEntity entity = httpresponse.getEntity();
                body = EntityUtils.toString(entity);
                if (entity != null) {
                    entity.consumeContent();
                }
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (ParseException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return body;
        }
    
    }

[SouthEast]: /images/20220713/eeb889d02ec54a55a012d22e239e89fd.png