如何java写/实现网络爬虫抓取网页 用java编写网络爬虫，用来爬网络音乐资源，再返回java页...
\u5982\u4f55java\u5199/\u5b9e\u73b0\u7f51\u7edc\u722c\u866b\u6293\u53d6\u7f51\u9875\u7f51\u7edc\u722c\u866b\u662f\u4e00\u4e2a\u81ea\u52a8\u63d0\u53d6\u7f51\u9875\u7684\u7a0b\u5e8f\uff0c\u5b83\u4e3a\u641c\u7d22\u5f15\u64ce\u4ece\u4e07\u7ef4\u7f51\u4e0a\u4e0b\u8f7d\u7f51\u9875\uff0c\u662f\u641c\u7d22\u5f15\u64ce\u7684\u91cd\u8981\u7ec4\u6210\u3002\u4f20\u7edf\u722c\u866b\u4ece\u4e00\u4e2a\u6216\u82e5\u5e72\u521d\u59cb\u7f51\u9875\u7684URL\u5f00\u59cb\uff0c\u83b7\u5f97\u521d\u59cb\u7f51\u9875\u4e0a\u7684URL\uff0c\u5728\u6293\u53d6\u7f51\u9875\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e0d\u65ad\u4ece\u5f53\u524d\u9875\u9762\u4e0a\u62bd\u53d6\u65b0\u7684URL\u653e\u5165\u961f\u5217\uff0c\u76f4\u5230\u6ee1\u8db3\u7cfb\u7edf\u7684\u4e00\u5b9a\u505c\u6b62\u6761\u4ef6\u3002
java\u5b9e\u73b0\u7f51\u9875\u6e90\u7801\u83b7\u53d6\u7684\u6b65\u9aa4\uff1a
(1)\u65b0\u5efaURL\u5bf9\u8c61\uff0c\u8868\u793a\u8981\u8bbf\u95ee\u7684\u7f51\u5740\u3002\u5982\uff1aurl=new URL("http://www.sina.com.cn");
(2)\u5efa\u7acbHTTP\u8fde\u63a5\uff0c\u8fd4\u56de\u8fde\u63a5\u5bf9\u8c61urlConnection\u5bf9\u8c61\u3002\u5982\uff1aurlConnection = (HttpURLConnection)url.openConnection();
(3)\u83b7\u53d6\u76f8\u5e94HTTP \u72b6\u6001\u7801\u3002\u5982responsecode=urlConnection.getResponseCode();
(4)\u5982\u679cHTTP \u72b6\u6001\u7801\u4e3a200\uff0c\u8868\u793a\u6210\u529f\u3002\u4eceurlConnection\u5bf9\u8c61\u83b7\u53d6\u8f93\u5165\u6d41\u5bf9\u8c61\u6765\u83b7\u53d6\u8bf7\u6c42\u7684\u7f51\u9875\u6e90\u4ee3\u7801\u3002
\u4e0b\u9762\u662f\u6e90\u4ee3\u7801,\u5e0c\u671b\u53ef\u4ee5\u5e2e\u5230\u4f60~~
package com.ly.mainprocess;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.Consts;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
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.cookie.Cookie;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class Test1 {
public static void main(String[] args){
Test1 test1 = new Test1();
System.out.println(test1.process("******","******"));
}
@SuppressWarnings("deprecation")
public boolean process(String username,String password) {
boolean ret=false;
DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpGet httpget;
HttpResponse response;
HttpEntity entity;
List cookies;
//\u7ec4\u5efa\u767b\u5f55\u7684post\u5305
HttpPost httppost = new HttpPost("http://login.hi.mop.com/Login.do"); // \u7528\u6237\u767b\u5f55
List nvps = new ArrayList();
nvps.add(new BasicNameValuePair("nickname", username));
nvps.add(new BasicNameValuePair("password", password));
nvps.add(new BasicNameValuePair("origURL", "http://hi.mop.com/SysHome.do"));
nvps.add(new BasicNameValuePair("loginregFrom", "index"));
nvps.add(new BasicNameValuePair("ss", "10101"));
httppost.setEntity(new UrlEncodedFormEntity(nvps, Consts.UTF_8));
httppost.addHeader("Referer", "http://hi.mop.com/SysHome.do");
httppost.addHeader("Connection", "keep-alive");
httppost.addHeader("Content-Type", "application/x-www-form-urlencoded");
httppost.addHeader("Accept-Language", "zh-CN,zh;q=0.8");
httppost.addHeader("Origin", "http://hi.mop.com");
httppost.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/30.0.1599.101 Safari/537.36");
response = httpclient.execute(httppost);
entity = response.getEntity();
//System.out.println("Login form get: " + response.getStatusLine());
EntityUtils.consume(entity);
//System.out.println("Post logon cookies:");
cookies = httpclient.getCookieStore().getCookies();
if (cookies.isEmpty()) {
//System.out.println("None");
} else {
for (int i = 0; i < cookies.size(); i++) {
//System.out.println("- " + cookies.get(i).toString());
}
}
//\u8fdb\u884c\u9875\u9762\u8df3\u8f6c
String url = ""; // \u9875\u9762\u8df3\u8f6c
Header locationHeader = response.getFirstHeader("Location");
//System.out.println(locationHeader.getValue());
if (locationHeader != null) {
url = locationHeader.getValue(); // \u5f97\u5230\u8df3\u8f6chref
HttpGet httpget1 = new HttpGet(url);
response = httpclient.execute(httpget1);
// \u767b\u9646\u6210\u529f\u3002\u3002\u3002hoho
}
entity = response.getEntity();
//System.out.println(response.getStatusLine());
if (entity != null) {
//System.out.println("Response content length: " + entity.getContentLength());
}
// \u663e\u793a\u7ed3\u679c
BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
String line = null;
while ((line = reader.readLine()) != null) {
//System.out.println(line);
}
//\u81ea\u52a8\u6253\u5361
// \u8bbf\u95ee\u7f51\u7ad9\u7684\u5b50\u7f51\u9875\u3002
HttpPost httppost1 = new HttpPost("http://home.hi.mop.com/ajaxGetContinusLoginAward.do"); // \u8bbe\u7f6e\u4e2a\u4eba\u4fe1\u606f\u9875\u9762
httppost1.addHeader("Content-Type", "text/plain;charset=UTF-8");
httppost1.addHeader("Accept", "text/plain, */*");
httppost1.addHeader("X-Requested-With", "XMLHttpRequest");
httppost1.addHeader("Referer", "http://home.hi.mop.com/Home.do");
response = httpclient.execute(httppost1);
entity = response.getEntity();
//System.out.println(response.getStatusLine());
if(response.getStatusLine().toString().indexOf("HTTP/1.1 200 OK")>=0){
ret = true;
}
if (entity != null) {
//System.out.println("Response content length: " + entity.getContentLength());
}
// \u663e\u793a\u7ed3\u679c
reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
line = null;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
} catch (Exception e) {
} finally {
httpclient.getConnectionManager().shutdown();
}
return ret;
}
}
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