Java Jsoup将内容保存到数据库中
我有一个url数组,我想从我在数据库中读取的url中存储信息。我的问题是我的数据列表太大,如果从上面读取序列化url,每个url存储在数据库中都需要时间 我知道有一种方法可以使用线程来操作,但我不知道怎么做,请帮助我。不管你用什么方法Java Jsoup将内容保存到数据库中,java,jsoup,Java,Jsoup,我有一个url数组,我想从我在数据库中读取的url中存储信息。我的问题是我的数据列表太大,如果从上面读取序列化url,每个url存储在数据库中都需要时间 我知道有一种方法可以使用线程来操作,但我不知道怎么做,请帮助我。不管你用什么方法 try { String lstUrls = "http://www.java2s.com/Tutorials/Java/Scala/index.htm\n" + "http://www.java2s.com/Tutorials/J
try {
String lstUrls = "http://www.java2s.com/Tutorials/Java/Scala/index.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0020__Scala_Variables.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0040__Scala_Variable_Declarations.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0060__Scala_Semicolons.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0080__Scala_Code_Blocks.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0090__Scala_Comments.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0100__Scala_Type_Hierarchy.htm\n";
String[] urls = lstUrls.split("\n");
for (String url : urls) {
Document doc = Jsoup.connect(url).userAgent("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.152 Safari/537.36").get();
Elements select = doc.select("div.row");
String html = select.html();
System.out.println(html);
/*
insert html to database
*/
}
} catch (IOException ex) {
ex.printStackTrace();
}
我建议在插入数据库之前压缩数据
//PreparedStatement.setBytes(1,compress(html));
public static byte[] compress(String str) throws Exception {
if (str == null || str.length() == 0) {
return null;
}
ByteArrayOutputStream obj = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(obj);
gzip.write(str.getBytes("UTF-8"));
gzip.close();
return obj.toByteArray();
}
public static String decompress(byte[] bytes) throws Exception {
GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(bytes));
BufferedReader bf = new BufferedReader(new InputStreamReader(gis,"UTF-8"));
String outStr = "";
String line;
while ((line = bf.readLine()) != null) {
outStr += line;
}
return outStr;
}
long ts = System.currentTimeMillis();
String filePath = String.valueOf(ts)+".gz";
saveToFile(filePath ,html);
--------
public static void saveToFile(String filePath, String text) {
try {
GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream(filePath));
gzos.write(text.getBytes("UTF-8"));
gzos.finish();
gzos.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
第二种方法是,将html数据保存到文件中,并在数据库中只存储文件路径
//PreparedStatement.setBytes(1,compress(html));
public static byte[] compress(String str) throws Exception {
if (str == null || str.length() == 0) {
return null;
}
ByteArrayOutputStream obj = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(obj);
gzip.write(str.getBytes("UTF-8"));
gzip.close();
return obj.toByteArray();
}
public static String decompress(byte[] bytes) throws Exception {
GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(bytes));
BufferedReader bf = new BufferedReader(new InputStreamReader(gis,"UTF-8"));
String outStr = "";
String line;
while ((line = bf.readLine()) != null) {
outStr += line;
}
return outStr;
}
long ts = System.currentTimeMillis();
String filePath = String.valueOf(ts)+".gz";
saveToFile(filePath ,html);
--------
public static void saveToFile(String filePath, String text) {
try {
GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream(filePath));
gzos.write(text.getBytes("UTF-8"));
gzos.finish();
gzos.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
我建议在插入数据库之前压缩数据
//PreparedStatement.setBytes(1,compress(html));
public static byte[] compress(String str) throws Exception {
if (str == null || str.length() == 0) {
return null;
}
ByteArrayOutputStream obj = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(obj);
gzip.write(str.getBytes("UTF-8"));
gzip.close();
return obj.toByteArray();
}
public static String decompress(byte[] bytes) throws Exception {
GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(bytes));
BufferedReader bf = new BufferedReader(new InputStreamReader(gis,"UTF-8"));
String outStr = "";
String line;
while ((line = bf.readLine()) != null) {
outStr += line;
}
return outStr;
}
long ts = System.currentTimeMillis();
String filePath = String.valueOf(ts)+".gz";
saveToFile(filePath ,html);
--------
public static void saveToFile(String filePath, String text) {
try {
GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream(filePath));
gzos.write(text.getBytes("UTF-8"));
gzos.finish();
gzos.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
第二种方法是,将html数据保存到文件中,并在数据库中只存储文件路径
//PreparedStatement.setBytes(1,compress(html));
public static byte[] compress(String str) throws Exception {
if (str == null || str.length() == 0) {
return null;
}
ByteArrayOutputStream obj = new ByteArrayOutputStream();
GZIPOutputStream gzip = new GZIPOutputStream(obj);
gzip.write(str.getBytes("UTF-8"));
gzip.close();
return obj.toByteArray();
}
public static String decompress(byte[] bytes) throws Exception {
GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(bytes));
BufferedReader bf = new BufferedReader(new InputStreamReader(gis,"UTF-8"));
String outStr = "";
String line;
while ((line = bf.readLine()) != null) {
outStr += line;
}
return outStr;
}
long ts = System.currentTimeMillis();
String filePath = String.valueOf(ts)+".gz";
saveToFile(filePath ,html);
--------
public static void saveToFile(String filePath, String text) {
try {
GZIPOutputStream gzos = new GZIPOutputStream(new FileOutputStream(filePath));
gzos.write(text.getBytes("UTF-8"));
gzos.finish();
gzos.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
要使用多个线程检索数据,可以执行以下操作:
Executor ex = Executors.newFixedThreadPool(3);
String lstUrls = "http://www.java2s.com/Tutorials/Java/Scala/index.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0020__Scala_Variables.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0040__Scala_Variable_Declarations.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0060__Scala_Semicolons.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0080__Scala_Code_Blocks.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0090__Scala_Comments.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0100__Scala_Type_Hierarchy.htm\n";
String[] urls = lstUrls.split("\n");
for (final String url : urls) {
try {
ex.execute(new Runnable() {
@Override
public void run() {
try {
Document doc = Jsoup
.connect(url)
.userAgent(
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.152 Safari/537.36")
.get();
Elements select = doc.select("div.row");
String html = select.html();
System.out.println(html);
/*
* insert html to database
*/
} catch (Exception e) {
e.printStackTrace();
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
这将使用3个线程并发处理URL,如果您想使用3个以上的线程,请更改此行Executor ex=Executors.newFixedThreadPool(3)编码>并用所需的任何数字替换3
您可以了解有关的更多信息要使用多线程检索数据,您可以执行以下操作:
Executor ex = Executors.newFixedThreadPool(3);
String lstUrls = "http://www.java2s.com/Tutorials/Java/Scala/index.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0020__Scala_Variables.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0040__Scala_Variable_Declarations.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0060__Scala_Semicolons.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0080__Scala_Code_Blocks.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0090__Scala_Comments.htm\n"
+ "http://www.java2s.com/Tutorials/Java/Scala/0100__Scala_Type_Hierarchy.htm\n";
String[] urls = lstUrls.split("\n");
for (final String url : urls) {
try {
ex.execute(new Runnable() {
@Override
public void run() {
try {
Document doc = Jsoup
.connect(url)
.userAgent(
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.152 Safari/537.36")
.get();
Elements select = doc.select("div.row");
String html = select.html();
System.out.println(html);
/*
* insert html to database
*/
} catch (Exception e) {
e.printStackTrace();
}
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
这将使用3个线程并发处理URL,如果您想使用3个以上的线程,请更改此行Executor ex=Executors.newFixedThreadPool(3)编码>并用所需的任何数字替换3
你可以找到更多关于
你可以做的事情是把输出排队并把它作为一个批次插入数据库,这样你只会打一次数据库。@如果我的答案对你有帮助,请考虑投票。谢谢Turink完成。对不起,英语不是我的语言,所以我不明白你说什么,你应该希望有更详细的说明或者一个我需要学习的文档。这当然是:D谢谢HasanagaOne,你可以做的就是把输出排队并把它作为一个批次插入到数据库中,这样你只会打一次数据库。英语不是我的语言,所以我不明白你说的话,你应该希望有更详细的说明或一份我需要学习的文档。那当然是:D谢谢你HasanagaI我认为如果将列表url拆分为多个线程,实现会更快。我看你也对阅读网页感兴趣,因此,试着用meI思考这个主题,如果将列表url拆分为多个线程,实现速度会更快。我看到你也对阅读网页感兴趣,所以试着用meIt思考这个主题很好,我认为要做得更复杂。我将了解更多关于你的方法。非常感谢您:当我添加common时,在for(最终字符串url:url){}内完成了以下通知,该语句是第一次运行通知。我想在完成工作后,循环通知可以输出吗?这很好,我想做得更复杂。我会了解更多关于你的方法。非常感谢您:当我添加common时,在for(最终字符串url:url){}内完成了以下通知,该语句是第一次运行通知。我刚做完工作循环通知可以输出吗?