Java采集网络数据并导入数据库实例代码。

采集百度的歌曲名，歌手和链接实例:

Java code复制代码
package webTools;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import dbTools.DBTools;

public class IOTOWeb {
public String getHtmlContent(String htmlURL) {
URL url = null;
String rowContent = “”;
StringBuffer htmlContent = new StringBuffer();
try {
url = new URL(htmlURL);
BufferedReader in = new BufferedReader(new InputStreamReader(url
.openStream(), “gb2312″));
while ((rowContent = in.readLine()) != null) {
htmlContent.append(rowContent);
}
in.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return htmlContent.toString();
}

public List getLink(String htmlContent) {
ArrayList listLink = new ArrayList();
String regex = “<td[^>]*>[\\(]*<a[^>]*href=(\”([^\"]*)\”|\’([^\']*)\’|([^\\s>]*))[^>]*>(.*?)[\\)]*[\\s]*</td>”;
Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
Matcher matcher = pattern.matcher(htmlContent);
while (matcher.find()) {
listLink.add(matcher.group());
}
return listLink;
}

public List<String> getHref(String htmlContent) {
String regex;
List listtHref = new ArrayList();
regex = “href=(\”([^\"]*)\”|\’([^\']*)\’|([^\\s>]*))\”";
Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
Matcher ma = pa.matcher(htmlContent);
while (ma.find()) {
listtHref.add(ma.group().replaceFirst(“href=\”", “”).replace(“\”",
“”));
}
return listtHref;
}

public List<String> getPerson(String htmlContent) {
String regex;
List list = new ArrayList();
regex = “\\(<a[^>]*href=(\”([^\"]*)\”|\’([^\']*)\’|([^\\s>]*))[^>]*>(.*?)\\)”;
Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
Matcher ma = pa.matcher(htmlContent);
while (ma.find()) {
list.add(ma.group().replaceFirst(“href=\”", “”).replace(“\”", “”));
}
return list;
}

public List<String> getSongName(String htmlContent) {
String regex;
List listPerson = new ArrayList();
regex = “<a[^>]*href=(\”([^\"]*)\”|\’([^\']*)\’|([^\\s>]*))[^>]*>(.*?)</a>\\s”;
Pattern pa = Pattern.compile(regex, Pattern.DOTALL);
Matcher ma = pa.matcher(htmlContent);
while (ma.find()) {
listPerson.add(ma.group());
}
return listPerson;
}

public String getMainContent(String htmlContent) {
String regex = “<table width=\”100%\” align=\”center\” cellpadding=\”0\” cellspacing=\”0\” class=\”list\”>(.*?)</table>”;
StringBuffer mainContent = new StringBuffer();
Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
Matcher matcher = pattern.matcher(htmlContent);
while (matcher.find()) {
mainContent.append(matcher.group());
}
return mainContent.toString();
}

public String outTag(final String s) {
return s.replaceAll(“<.*?>”, “”);
}

DBTools dbTools = new DBTools();

public void getFromBaiduMap3(String htmlURL) throws Throwable {
HashMap htmlContentMap = new HashMap();
String htmlContent = getHtmlContent(htmlURL);
String mainContent = getMainContent(htmlContent);
List listLink = getLink(mainContent);
for (int j = 0; j < listLink.size(); j++) {
String tdTag = listLink.get(j).toString();
List songNameList = getSongName(tdTag);
String songName = outTag(songNameList.get(0).toString());
List personList = getPerson(tdTag);
String songPerson = “”;
if (personList.size() != 0) {
for (int n = 0; n < personList.size(); n++) {
// System.out.println(personList.get(n).toString());
songPerson = outTag(personList.get(n).toString());
}
} else {
songPerson = “无”;
}
// System.out.print(songNameList.get(0).toString());
List hrefList = getHref(songNameList.get(0).toString());
String songHref = hrefList.get(0).toString();
System.out.println();
String sql = “insert into song(songName,songPerson,songHref) values(?,?,?)”;
ArrayList list_values = new ArrayList();
list_values.add(songName);
list_values.add(songPerson);
list_values.add(songHref);
dbTools.update(sql, list_values);
}
}
}
DBTools数据库链接类:

Java code复制代码
package dbTools;

import java.util.ArrayList;

import java.sql.*;

public class DBTools {
private PreparedStatement preparedStatement;
private ResultSet resultSet;
private Connection connection;

public DBTools() {
try {
Class.forName(“com.mysql.jdbc.Driver”);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
connection = DriverManager.getConnection(
“jdbc:mysql://localhost:3306/TestURL”, “root”, “zhuyi”);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public ArrayList query(String sql, ArrayList list_values) throws Throwable {
ArrayList listRows = new ArrayList();
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < list_values.size(); i++) {
preparedStatement.setObject(i + 1, list_values.get(i));
}
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
String[] rowinfo = new String[resultSet.getMetaData()
.getColumnCount()];
for (int i = 0; i < rowinfo.length; i++) {
rowinfo[i] = resultSet.getString(i + 1);
}
listRows.add(rowinfo);
}
return listRows;
}

public void update(String sql, ArrayList list_values) throws Throwable {
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < list_values.size(); i++) {
preparedStatement.setObject(i + 1, list_values.get(i));
}
preparedStatement.executeUpdate();
preparedStatement.close();
}
}
Servlet调用：

Java code复制代码
package controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import webTools.IOTOWeb;

public class TestURL extends HttpServlet {

/**
* Constructor of the object.
*/
public TestURL() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts “destroy” string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
IOTOWeb iotoWeb = new IOTOWeb();
iotoWeb.getFromBaiduMap3(“http://list.mp3.baidu.com/topso/mp3topsong.html?id=1?top2″);
} catch (Throwable e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType(“text/html”);
PrintWriter out = response.getWriter();
out
.println(“<!DOCTYPE HTML PUBLIC \”-//W3C//DTD HTML 4.01 Transitional//EN\”>”);
out.println(“<HTML>”);
out.println(” <HEAD><TITLE>A Servlet</TITLE></HEAD>”);
out.println(” <BODY>”);
out.print(” This is “);
out.print(this.getClass());
out.println(“, using the POST method”);
out.println(” </BODY>”);
out.println(“</HTML>”);
out.flush();
out.close();
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}

}
获取金书网的图书名：

Java code复制代码
package webTools;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import dbTools.DBTools;

public class GetBook {
public String getHtmlContent(String htmlURL) throws Throwable {
URL url = null;
String rowContent = “”;
StringBuffer htmlContent = new StringBuffer();
url = new URL(htmlURL);
BufferedReader in = new BufferedReader(new InputStreamReader(url
.openStream(), “gb2312″));
while ((rowContent = in.readLine()) != null) {
htmlContent.append(rowContent);
}
in.close();

return htmlContent.toString();
}

public String getBookName(String htmlContent) {
String bookName = “”;
String regex = “<span class=\”style15\”>[^>]*</span>”;
Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
Matcher matcher = pattern.matcher(htmlContent);
if (matcher.find()) {
bookName = matcher.group();
}
return bookName;
}

public String outTag(final String s) {

return s.replaceAll(“<.*?>”, “”);
}

DBTools dbtools = new DBTools();

public void getFromJINSHU(String htmlURL) throws Throwable {
String htmlContent = getHtmlContent(htmlURL);
String bookName = outTag(getBookName(htmlContent));
if (bookName != null && !”".equals(bookName)) {
System.out.println(bookName);
String sql = “insert into bookinfo(bookName) values(?)”;
ArrayList list_values = new ArrayList();
list_values.add(bookName);
dbtools.update(sql, list_values);
}
}
}
调用Servlet：

Java code复制代码
package controller;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import webTools.GetBook;

public class TestBook extends HttpServlet {

/**
* Constructor of the object.
*/
public TestBook() {
super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts “destroy” string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
int i = 1;

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
GetBook bookinfo = new GetBook();

for (; i < 10000; i++) {
String bookURL = “http://www.golden-book.com/booksinfo/12/” + i
+ “.html”;
try {
bookinfo.getFromJINSHU(bookURL);
} catch (Throwable e) {
i++;
doPost(request, response);
}
}
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
GetBook bookinfo = new GetBook();

for (; i < 10000; i++) {
String bookURL = “http://www.golden-book.com/booksinfo/12/” + i
+ “.html”;
try {
bookinfo.getFromJINSHU(bookURL);
} catch (Throwable e) {
i++;
doGet(request, response);
}
}
}

/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}