1.三个参数分别是:字符串,字符串头,字符串尾
public static String getcontent(String s,String head,String end)
{
int index1=s.indexOf(head);
int index2=index1+head.length();
if(index1>0)
{
index2=s.indexOf(end,index2);
if(index2>0)
{
return s.substring(index1+head.length(),index2);
}
}
return "";
}