根据相对url得到绝对url

public
 
static
 String makeAbsoluteURL(String link, String innerURL) {
    String retString = ""
;
    try
 {
        URI base = new
 URI(link);
//link对应当前页面地址
        URI abs = base.resolve(innerURL);//解析于上述网页的相对URL，得到绝对URI
        URL absURL = abs.toURL();//转成URL
        retString = absURL.toString();
    } catch
 (Exception e) {
        return
 
""
;
    }
    return
 retString;
}