java爬虫与python爬虫的对比：
python做爬虫语法更简单，代码更简洁。java的语法比python严格，而且代码也更复杂
示例如下：
url请求：
java版的代码如下：
public String call (String url){
String content = "";
BufferedReader in = null;
try{
URL realUrl = new URL(url);
URLConnection connection = realUrl.openConnection();
connection.connect();
in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"gbk"));
String line ;
while ((line = in.readLine()) != null){
content += line + "
";
}
}catch (Exception e){
e.printStackTrace();
}
finally{
try{
if (in != null){
in.close();
}
}catch(Exception e2){
e2.printStackTrace();
}
}
return content;
}python版的代码如下：
# coding=utf-8
import chardet
import urllib2
url = "http://www.baidu.com"
data = (urllib2.urlopen(url)).read()
charset = chardet.detect(data)
code = charset['encoding']
content = str(data).decode(code, 'ignore').encode('utf8')
print content正则表达式
java版的代码如下：
public String call(String content) throws Exception {
Pattern p = Pattern.compile("content":".*?"");
Matcher match = p.matcher(content);
StringBuilder sb = new StringBuilder();
String tmp;
while (match.find()){
tmp = match.group();
tmp = tmp.replaceAll(""", "");
tmp = tmp.replace("content:", "");
tmp = tmp.replaceAll("<.*>", "");
sb.append(tmp + "
");
}
String comment = sb.toString();
return comment;
}
} python的代码如下：
import repattern = re.compile(正则) group = pattern.findall(字符串)
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