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如果字符串出现乱码:

         String name = "放假";
        //1.1 先将字符串转换成ISO-8859-1 , 然后利用String的构造函数将字符串转换成UTF-8  new String(Bytes[] bytes , “UTF-8”)
        //将name变量的值转换成字节组，默认转换成ISO-8859-1编码
        byte[] bytes = name.getBytes();
        //将name从ISO-8859-1转换成UTF-8
        name = new String(bytes,"UTF-8");
        //1.2 直接将字符串转换成UTF-8
        byte[] bytes1 = name.getBytes("UTF-8");
        name = new String(bytes1);
         //1.3 UrlEncoder的encoder(字符串,字符码)设置编码 ， UrlDecoder的decoder(字符串,字符码)解密，然后设置指定的字符码
        String nameEncode = URLEncoder.encode(name, "ISO-8859-1");
        nameEncode = URLDecoder.decode(nameEncode, "UTF-8");