短网址

短网址就是很简短的网址，目前有两种实现方式。1.自有短网址域名或第三方，生成短网址后，自动解析。2.生成短网址后，保存短网址与原网址映射关系，由本系统域名对外转发并跳转。使用第二种方法实现方式如下：

public class ShortUrl { 
    public static String ShortText(String originalUrl){ 
        String key = "com.maidepiao";                
        String[] chars = new String[]{         
            "a","b","c","d","e","f","g","h", 
            "i","j","k","l","m","n","o","p", 
            "q","r","s","t","u","v","w","x", 
            "y","z","0","1","2","3","4","5", 
            "6","7","8","9","A","B","C","D", 
            "E","F","G","H","I","J","K","L", 
            "M","N","O","P","Q","R","S","T", 
            "U","V","W","X","Y","Z" 
        }; 
        String hex = Encript.md5(key + originalUrl); 
        int hexLen = hex.length(); 
        int subHexLen = hexLen / 8; 
        String[] ShortStr = new String[4]; 
         
        for (int i = 0; i < subHexLen; i++) { 
            String outChars = ""; 
            int j = i + 1; 
            String subHex = hex.substring(i * 8, j * 8); 
            long idx = Long.valueOf("3FFFFFFF", 16) & Long.valueOf(subHex, 16); 
             
            for (int k = 0; k < 6; k++) { 
                int index = (int) (Long.valueOf("0000003D", 16) & idx); 
                outChars += chars[index]; 
                idx = idx >> 5; 
            } 
            ShortStr[i] = outChars; 
        } 
        Random random=new Random();
        int j=random.nextInt(4);
        /**
         * 将短连接与原链接的映射关系保存至redis,由系统向外重定向
         */
        JedisUtils.set("shortURL:"+ShortStr[j], originalUrl, 0);
        return ShortStr[j]; 
    } 
} 

生成短连接后，根据短连接码请求自有系统，和普通的request一样，然后重定向跳转原路径

@Controller
@RequestMapping("")
public class ShortUrlRoute extends BaseController{
    //private static final Logger logger = LogManager.getLogger(ShortUrlRoute.class);
    
    @RequestMapping(value= "/{shortUrlKey}" )  
    public String message(@PathVariable String shortUrlKey,HttpServletRequest request,HttpServletResponse response) {
        return "redirect:"+JedisUtils.get("shortURL:"+shortUrlKey,"");
    }
}

采用的是springMVC请求，使用redis作为中间的载体，请求短网址时，根据短网址在redis找到原路径，然后跳转即可。

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