public static void main(String[] args) throws MalformedURLException {
BufferedReader in = null;
String result = null;
try {
URL url = new URL("http://www.baidu.com");
in = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"));
StringBuffer sb = new StringBuffer();
String str = null;
while ((str = in.readLine()) != null) {
sb.append(str);
}
result = sb.toString();
System.out.println(result);
} catch (Exception ex) {
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
返回的是:
<!DOCTYPE html><!--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 === "" ? "?" : "&")+ "bdorz_come=1")+ '" name="tj_login" class="lb">登录</a>');</script>
<a href=//www.baidu.com/more/ name=tj_briicon class=bri style="display: block;">更多产品</a> </div> </div> </div> <div id=ftCon> <div id=ftConw> <p id=lh> <a href=http://home.baidu.com>关于百度</a> <a href=http://ir.baidu.com>About Baidu</a> </p> <p id=cp>©2017 Baidu <a href=http://www.baidu.com/duty/>使用百度前必读</a> <a href=http://jianyi.baidu.com/ class=cp-feedback>意见反馈</a> 京ICP证030173号 <img src=//www.baidu.com/img/gs.gif> </p> </div> </div> </div> </body> </html>
三种连接方法:
// 方法一
URL url = new URL("http://www.sina.com.cn");
URLConnection urlcon = url.openConnection();
InputStream is = urlcon.getInputStream();
// 方法二
URL url = new URL("http://www.yhfund.com.cn");
HttpURLConnection urlcon = (HttpURLConnection)url.openConnection();
InputStream is = urlcon.getInputStream();
//方法三
URL url = new URL("http://www.yhfund.com.cn");
InputStream is = url.openStream();
/**
* 调用数据同步
* @param date 当前日期 格式yyyy-MM-dd
* @param totalExclusion 传入“”字符串
* @return 返回结果
*/
public static String queryDataSynStatus(String date, String totalExclusion) {
try {
System.out.println("Data Collection Date: " + date);
if (date == null)
return "Data Synchronized Failure!";
System.out.println("Data Synchronized Start!");
String local = "http://localhost:7070/a/b.do";
HashMap<String, String> params = new HashMap<String, String>();
params.put("date", date);
params.put("totalExclusion", totalExclusion);
StringBuffer sb = new StringBuffer();
for (String key : params.keySet()) {
sb.append(key).append("=")
.append(params.get(key) != null ? params.get(key) : "")
.append("&");
}
sb.deleteCharAt(sb.length() - 1);
// 新增接口
String param = HttpRequest.sendPost(local, sb.toString());
System.out.println(param);
System.out.println("Data Synchronized End!");
} catch (Exception e) {
e.printStackTrace();
}
return "Data Synchronized Successfully!";
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
conn.setRequestProperty("Host", "www.baidu.com");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
conn.setRequestProperty("Accept-Language", "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");
conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
conn.setRequestProperty("Content-Length", "37");
conn.setRequestProperty("Cookie", "JSESSIONID=************************");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Pragma", "no-cache");
conn.setRequestProperty("Cache-Control", "no-cache");
// 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(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}