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：
1 package zhang; 2 3 import java.net.*; 4 import java.util.*; 5 import java.io.*; 6 7 public class GetPostTest 8 { 9 10 public static String sendGet(String url, String param) 11 { 12 String result = ""; 13 String urlName = url + "?" + param; 14 15 try 16 { 17 URL realUrl = new URL(urlName); 18 URLConnection conn = realUrl.openConnection(); 19 20 //设置请求属性 21 22 23 conn.connect(); 24 25 Map<String, List<String>> map = conn.getHeaderFields(); 26 27 for(String key : map.keySet()) 28 { 29 System.out.println(key + "--->" + map.get(key)); 30 } 31 32 try( 33 BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8")); 34 ) 35 36 { 37 String line; 38 39 while((line = in.readLine())!=null) 40 { 41 result += " "+line; 42 } 43 } 44 45 46 } 47 catch (Exception e) 48 { 49 System.out.println("get请求错误"); 50 e.printStackTrace(); 51 } 52 53 return result; 54 } 55 56 57 public static String sendPost(String url , String param) 58 { 59 String result = ""; 60 61 62 try 63 { 64 URL urlr = new URL(url); 65 URLConnection conn = urlr.openConnection(); 66 conn.setDoOutput(true); 67 conn.setDoInput(true); 68 69 try(PrintWriter out = new PrintWriter(conn.getOutputStream())) 70 { 71 out.print(param); 72 out.flush(); 73 } 74 try(BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"))) 75 { 76 String line; 77 while((line = in.readLine())!= null) 78 { 79 result += "/n" + line; 80 } 81 } 82 } 83 catch (Exception e) 84 { 85 System.out.println("POST请求出错"); 86 e.printStackTrace(); 87 } 88 return result; 89 } 90 91 public static void main(String[] args) 92 { 93 System.out.println("Hello World!"); 94 //System.out.println(GetPostTest.sendGet("http://www.baidu.com","")); 95 System.out.println(GetPostTest.sendPost("http://www.baidu.com","name=sdfsdf")); 96 } 97 }
运行结果：
1 E:javajava_test etprogram>java GetPostTest 2 错误: 找不到或无法加载主类 GetPostTest 3 4 E:javajava_test etprogram>java zhang.GetPostTest 5 Hello World! 6 Accept-Ranges--->[bytes] 7 null--->[HTTP/1.1 200 OK] 8 Cache-Control--->[private, no-cache, no-store, proxy-revalidate, no-transform] 9 Server--->[bfe/1.0.8.18] 10 ETag--->["588604c8-94d"] 11 Connection--->[Keep-Alive] 12 Set-Cookie--->[BDORZ=27315; max-age=86400; domain=.baidu.com; path=/] 13 Pragma--->[no-cache] 14 Last-Modified--->[Mon, 23 Jan 2017 13:27:36 GMT] 15 Content-Length--->[2381] 16 Date--->[Sat, 10 Mar 2018 07:15:26 GMT] 17 Content-Type--->[text/html] 18 19 <!DOCTYPE html> 20 <!--STATUS OK--><html> <head><meta http-equiv=content-type content=text/html;charset=utf-8><meta http-equiv=X-UA-Compatible content=IE=Edge><meta content=always name=referrer><link rel=stylesheet type=text/css href=http://s1.bdstatic.com/r/www/cache/bdorz/baidu.min.css><title>百度一下，你就知道</title></head> <body link=#0000cc> <div id=wrapper> <div id=head> <div class=head_wrapper> <div class=s_form> <div class=s_form_wrapper> <div id=lg> <img hidefocus=true src=//www.baidu.com/img/bd_logo1.png width=270 height=129> </div> <form id=form name=f action=//www.baidu.com/s class=fm> <input type=hidden name=bdorz_come value=1> <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=tn value=baidu><span class="bg s_ipt_wr"><input id=kw name=wd class=s_ipt value maxlength=255 autocomplete=off autofocus></span><span class="bg s_btn_wr"><input type=submit id=su value=百度一下 class="bg s_btn"></span> </form> </div> </div> <div id=u1> <a href=http://news.baidu.com name=tj_trnews class=mnav>新闻</a> <a href=http://www.hao123.com name=tj_trhao123 class=mnav>hao123</a> <a href=http://map.baidu.com name=tj_trmap class=mnav>地图</a> <a href=http://v.baidu.com name=tj_trvideo class=mnav>视频</a> <a href=http://tieba.baidu.com name=tj_trtieba class=mnav>贴吧</a> <noscript> <a href=http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2f%3fbdorz_come%3d1 name=tj_login class=lb>登录</a> </noscript> <script>document.write('<a href="http://www.baidu.com/bdorz/login.gif?login&tpl=mn&u='+ encodeURIComponent(window.location.href+ (window.location.search === "" ? 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还需要看的问题：输入输出流和文件的读写操作