URLEncoder、URLDecoder

代码：

    public static void main(String[] args) throws UnsupportedEncodingException {
        String urlStr = "http://172.168.1.1192.168.1.1:8888/store/get?id=dc2-80d";
        String urlStrEncode = URLEncoder.encode(urlStr, "utf-8" );
        String urlStrDecode = URLDecoder.decode(urlStrEncode, "utf-8");
        System.out.println("urlStrEncode = " + urlStrEncode);
        System.out.println("urlStrDecode = " + urlStrDecode);

        // 将普通字符串转换成 application/x-www-form-urlencoded字符串
        String str = URLEncoder.encode("默默前行", "UTF-8");
        System.out.println("str = " + str);

        // 将application/x-www-form-urlencoded字符串转换成普通字符串
        String keyWord = URLDecoder.decode("%E9%BB%98%E9%BB%98%E5%89%8D%E8%A1%8C", "UTF-8");
        System.out.println("keyWord = " + keyWord);
    }

输出：

urlStrEncode = http%3A%2F%2F172.168.1.1192.168.1.1%3A8888%2Fstore%2Fget%3Fid%3Ddc2-80d
urlStrDecode = http://172.168.1.1192.168.1.1:8888/store/get?id=dc2-80d
str = %E9%BB%98%E9%BB%98%E5%89%8D%E8%A1%8C
keyWord = 默默前行

"%E9%BB%98%E9%BB%98%E5%89%8D%E8%A1%8C" 这些字符就是applicaion/x-www-form-urlencoded MIME字符串。

当URL地址里包含非西欧字符的字符串时,系统会将这些非西欧转换成如图所示的特殊字符串,那么编码过程中可能涉及将普通字符串和这种特殊字符串的相关转换,这就是需要使用URLDecoder和URLEncoder类。

参考资料：https://blog.csdn.net/y1991024/article/details/62890221