字符串操作去空格，替换，截取

 1.去除输入字符串头尾的空格

String title = request.getParameter("title");
  
  for(int i=0;i    
      while (title.startsWith("　")||title.startsWith(" ")) {
    title = title.substring(1, title.length()).trim();
       
   }
   while (title.endsWith("　")||title.endsWith(" ")) {
    title = title.substring(0, title.length() - 1).trim();
    
   }
   title=title.trim();
      
     }

2.字符串的替换sjh

        Pattern p= Pattern.compile(domain);//domain为要替换的字符串
       sjhlogo = p.matcher(sjhlogo).replaceAll(file_dir);//sjhlogo为原字符串，file-dir为替换的字符串

3.字符串的截取

      String tt=infosubstring(info.lastIndexOf("/"),info.lastIndexOf("."));//从info.lastIndexOf("/")截到info.lastIndexOf("."));//