HTTP-java模拟Post请求小栗子

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.net.URL;
 import java.net.URLConnection;

 import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLSession;

 import org.apache.log4j.Logger;

 import com.xwtech.parser.PostRequestHtmlParser;

 /**
  * Post请求类——得到HTML响应
  */
 public class PostRequest extends Thread {
     private String url = "https://b2b.10086.cn/b2b/main/listVendorNoticeResult.html?noticeBean.noticeType=";
     private String params;
     private Logger logger;

     public PostRequest(int noticeType, int perPageSize) {
         logger = Logger.getLogger(PostRequest.class);
         this.url = this.url + noticeType;  //拼接URL请求，不包含参数
         params = "page.currentPage=" + currentPage + "&page.perPageSize=" + perPageSize
                 + "&noticeBean.sourceCH=&noticeBean.source="
                 + "&noticeBean.title=&noticeBean.startDate=&noticeBean.endDate=";
     }

     public void run() {
         PrintWriter out = null;
         BufferedReader in = null;
         URLConnection conn = null;
         String result = "";
         try {
             conn = new URL(url).openConnection();
             conn.setUseCaches(false);
             conn.setRequestProperty("accept", "*/*");
             conn.setRequestProperty("connection", "Keep-Alive");
             conn.setRequestProperty("user-agent",
                     "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36");
             conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
             // 发送POST请求必须设置如下两行
             conn.setDoOutput(true);
             conn.setDoInput(true);

             // 获取URLConnection对象对应的输出流
             out = new PrintWriter(conn.getOutputStream());
             // 发送请求参数
             out.print(params);
             // flush输出流的缓冲
             out.flush();
             in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
             String line;
             while ((line = in.readLine()) != null) {
                 result += line;
             }
         } catch (Exception e) {
             logger.error(currentThread().getName() + "线程Post请求出现问题!\n" + e.getMessage() + "\n");
         } finally {// 使用finally块来关闭输出流、输入流
             try {
                 if (out != null) {
                     out.close();
                 }
                 if (in != null) {
                     in.close();
                 }
             } catch (IOException ex) {
                 logger.error(currentThread().getName() + "线程Post请求数据流出现问题!\n" + ex.getMessage() + "\n");
             }
         }　
         //获取到相应结果result ，可以直接在这里进行下一步处理，或者放入到全局字段中，通过其他方式获取......
     }
 }

上面对应的参数以及url等信息可以使用chrome,firefox等浏览器network组件查看。

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