Java网络编程二

向web站点发送get post请求，并从web站点取得响应

通相应的set方法，在调用connect()方法前，可以设置请求的各种参数，实现同浏览器类似的访问，调用connect()后可以调用相应的get的方法得到服务器返回的各种值（和浏览器页面一样，只是没有经过浏览器解析，阅读困难）

没设置setRequestProperty()也能正常运行，，，

1.集合Map所在的包：java.util

代码：

 package zhang;

 import java.net.*;

 import java.util.*;

 import java.io.*;

 public class  GetPostTest

 {

     public static String sendGet(String url, String param)

     {

         String result = "";

         String urlName = url + "?" + param;

         try

         {

             URL realUrl = new URL(urlName);

             URLConnection conn = realUrl.openConnection();

             //设置请求属性

             conn.connect();

             Map<String, List<String>> map = conn.getHeaderFields();

             for(String key : map.keySet())

             {

                 System.out.println(key + "--->" + map.get(key));

             }

             try(

                 BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));

             )

             {

                 String line;

                 while((line = in.readLine())!=null)

                 {

                     result += "\n"+line;

                 }

             }

         }

         catch (Exception e)

         {

             System.out.println("get请求错误");

             e.printStackTrace();

         }

         return result;

     }

     public static String sendPost(String url , String param)

     {

         String result = "";

         try

         {

             URL urlr = new URL(url);

             URLConnection conn = urlr.openConnection();

             conn.setDoOutput(true);

             conn.setDoInput(true);

             try(PrintWriter out = new PrintWriter(conn.getOutputStream()))

             {

                 out.print(param);

                 out.flush();

             }

             try(BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8")))

             {

                 String line;

                 while((line = in.readLine())!= null)

                 {

                     result += "/n" + line;

                 }

             }

         }

         catch (Exception e)

         {

             System.out.println("POST请求出错");

             e.printStackTrace();

         }

         return result;

     }

     public static void main(String[] args)

     {

         System.out.println("Hello World!");

         //System.out.println(GetPostTest.sendGet("http://www.baidu.com",""));

         System.out.println(GetPostTest.sendPost("http://www.baidu.com","name=sdfsdf"));

     }

 }

运行结果：

 E:\java\java_test\netprogram>java GetPostTest

 错误: 找不到或无法加载主类 GetPostTest

 E:\java\java_test\netprogram>java zhang.GetPostTest

 Hello World!

 Accept-Ranges--->[bytes]

 null--->[HTTP/1.1 200 OK]

 Cache-Control--->[private, no-cache, no-store, proxy-revalidate, no-transform]

 Server--->[bfe/1.0.8.18]

 ETag--->["588604c8-94d"]

 Connection--->[Keep-Alive]

 Set-Cookie--->[BDORZ=27315; max-age=86400; domain=.baidu.com; path=/]

 Pragma--->[no-cache]

 Last-Modified--->[Mon, 23 Jan 2017 13:27:36 GMT]

 Content-Length--->[2381]

 Date--->[Sat, 10 Mar 2018 07:15:26 GMT]

 Content-Type--->[text/html]

 <!DOCTYPE html>

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src="//www.baidu.com/img/baidu_jgylogo3.gif" alt="到百度首页" title="到百度首页"> </a> <form id="form" name="f" action="/s" class="fm"> <input type="hidden" name="ie" value="utf-8"> <input type="hidden" name="f" value="8"> <input type="hidden" name="rsv_bp" value="1"> <input type="hidden" name="rsv_idx" value="1"> <input type="hidden" name="ch" value=""> <input type="hidden" name="tn" value="baiduerr"> <input type="hidden" name="bar" value=""> <span class="bg s_ipt_wr"> <input id="kw_tip" unselectable="on" onselectstart="return false;" class="s_ipt s_ipt_tip" disabled="" autocomplete="off" value="" maxlength="100" style="display: none;"> <input id="kw" name="wd" class="s_ipt" value="" maxlength="100" autocomplete="off"> </span><span class="bg s_btn_wr"> <input type="submit" id="su" value="百度一下" class="bg s_btn"> </span><span class="tools"> <span id="mHolder"> <div id="mCon"> <span>输入法</span> </div> <ul id="mMenu"> <li><a href="javascript:;" name="ime_hw">手写</a> </li> <li><a href="javascript:;" name="ime_py">拼音</a> </li> <li class="ln"></li> <li><a href="javascript:;" name="ime_cl">关闭</a> </li> </ul> </span> <span class="shouji" style="display: none;"><a href="http://w.x.baidu.com/go/mini/8/10000020" onmousedown="return ns_c({'fm':'behs','tab':'bdbrowser'})">百度浏览器，打开网页快2秒！</a> </span> </span> <input type="hidden" name="rn" value=""> <input type="hidden" name="rsv_enter" value="1"> </form> <div id="m"></div> </div></div> </div></div> <div class="s_tab" id="s_tab"> <b>网页</b> <a href="http://news.baidu.com/ns?cl=2&amp;rn=20&amp;tn=news&amp;word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'news'})">新闻</a><a href="http://tieba.baidu.com/f?kw=&amp;fr=wwwt" wdfield="kw" onmousedown="return c({'fm':'tab','tab':'tieba'})">贴吧</a><a href="http://zhidao.baidu.com/q?ct=17&amp;pn=0&amp;tn=ikaslist&amp;rn=10&amp;word=&amp;fr=wwwt" wdfield="word" onmousedown="return c({'fm':'tab','tab':'zhidao'})"> 知道</a><a href="http://music.baidu.com/search?fr=ps&amp;key=" wdfield="key" onmousedown="return c({'fm':'tab','tab':'music'})">音乐</a><a href="http://image.baidu.com/i?tn=baiduimage&amp;ps=1&amp;ct=201326592&amp;lm=-1&amp;cl=2&amp;nc=1&amp;word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'pic'})">图片</a><a href="http://v.baidu.com/v?ct=301989888&amp;rn=20&amp;pn=0&amp;db=0&amp;s=25&amp;word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'video'})">视频</a><a href="http://map.baidu.com/m?word=&amp;fr=ps01000" wdfield="word" onmousedown="return c({'fm':'tab','tab':'map'})">地图</a><a href="http://wenku.baidu.com/search?word=&amp;lm=0&amp;od=0" wdfield="word" onmousedown="return c({'fm':'tab','tab':'wenku'})">文库</a><a href="//www.baidu.com/more/" onmousedown="return c({'fm':'tab','tab':'more'})">更多?</a> </div>/n<div id="ftCon"><div id="ftConw"><p id="lh"> <a id="seth" onclick="h(this)" href="/" onmousedown="return ns_c({'fm':'behs','tab':'homepage','pos':0})">把百度设为主页</a><a id="setf" href="http://www.baidu.com/cache/sethelp/index.html" onmousedown="return ns_c({'fm':'behs','tab':'favorites','pos':0})" target="_blank" style="display: inline;">把百度 设为主页</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about'})" href="http://home.baidu.com">关于百度</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about_en'})" href="http://ir.baidu.com">About Baidu</a> </p> <p id="cp">?2014&nbsp;Baidu&nbsp;<a href="/duty/" name="tj_duty">使用百度前必读</a>&nbsp;京ICP证030173号&nbsp;<i class="c-icon-icrlogo"></i> </p> </div> </div>/n<div id="wrapper_wrapper" style="display: block;">/n <style>/n               .nors{/n

                         position: relative;/n                   }/n                     .norsTitle{/n

         font-size: 22px;/n                              font-family: Microsoft Yahei;/n                 font-weight: normal;/n                          color: #333;/n                          margin: 35px 0 25px 0;/n                }/n

                 .norsSuggest {/n                                display: inline-block;/n                        color:#333;/n                           font-family:arial;/n                            font-size: 13px;/n

 position: relative;/n                   }/n/n                   .norsSuggest li{/n                              list-style: decimal;/n                  }/n                     .norsTitle2 {/n                         font-family: arial;/n

                         font-size: 13px;/n                              color: #666;    /n              }/n

         .norsSuggest li{/n                              margin: 13px 0;/n                       }/n             .norsSuggest ol{/n                              margin-left: 47px;/n                    }/n                 #foot{/n

                 position: fixed;/n                              _position: absolute;/n                  bottom: 0;/n

                         width: 100%;/n                          clear: both;/n                  }/n </style>/n  <div id="content_left">/n               <div class="nors">/n                    <div class="norsSuggest">/n

 <h3 class="norsTitle">很抱歉，您要访问的页面不存在！</h3>/n                             <p class="norsTitle2">温馨提示：</p>/n                          <ol>/n                                  <li>请检查您访问的网址是否正确</li> /n

                         <li>如果您不能确认访问的网址，请浏览<a href="http://www.baidu.com/more/index.html">百度更多</a> 页面查看更多网址。</li>/n                                       <li>回到顶部重新发起搜索</li>/n

 <li>如有任何意见或建议，请及时<a href="http://qingting.baidu.com/index">反馈给我们</a>。</li>/n

 /n/n                            </ol>/n                 </div>/n                </div>/n        </div>/n/n<div id="foot"><span class="foot_c">?2015&nbsp;Baidu&nbsp;<span>此内容系百度根据您的指令自动搜索的结果，不代表百度赞成被搜索网站的内容或立场</span></span>/n<span id="help"><a href="http://www.baidu.com/search/jubao.html" target="_blank">举报</a></span></div>/n/n<div class="c-tips-container" id="c-tips-container"></div></div></div><div class="c-tips-container" id="c-tips-container"></div>/n/n</body></html>

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