前端传我一个加密得字符串,后端该如何解密? escape

兔子家族-二哥 2019-07-01 09:57:29
如果都在前端 JS 加密那就unescape解密就行了,我JAVA新手,做.net得被逼上梁山了,求解。
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KK~ 2019-07-03
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public class Escape {  
    private final static String[] hex = {  
        "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",  
        "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",  
        "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",  
        "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",  
        "40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F",  
        "50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F",  
        "60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F",  
        "70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F",  
        "80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F",  
        "90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F",  
        "A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF",  
        "B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF",  
        "C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF",  
        "D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF",  
        "E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",  
        "F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF"  
    };  
    private final static byte[] val = {  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,  
        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F  
    };  
    public static String escape(String s) {  
        StringBuffer sbuf = new StringBuffer();  
        int len = s.length();  
        for (int i = 0; i < len; i++) {  
            int ch = s.charAt(i);  
            if (ch == ' ') {                        // space : map to '+'   
                sbuf.append('+');  
            } else if ('A' <= ch && ch <= 'Z') {    // 'A'..'Z' : as it was  
                sbuf.append((char)ch);  
            } else if ('a' <= ch && ch <= 'z') {    // 'a'..'z' : as it was  
                sbuf.append((char)ch);  
            } else if ('0' <= ch && ch <= '9') {    // '0'..'9' : as it was  
                sbuf.append((char)ch);  
            } else if (ch == '-' || ch == '_'       // unreserved : as it was  
                || ch == '.' || ch == '!'  
                || ch == '~' || ch == '*'  
                || ch == '/'' || ch == '('  
                || ch == ')') {  
                sbuf.append((char)ch);  
            } else if (ch <= 0x007F) {              // other ASCII : map to %XX  
                sbuf.append('%');  
                sbuf.append(hex[ch]);  
            } else {                                // unicode : map to %uXXXX  
                sbuf.append('%');  
                sbuf.append('u');  
                sbuf.append(hex[(ch >>> 8)]);  
                sbuf.append(hex[(0x00FF & ch)]);  
            }  
        }  
        return sbuf.toString();  
    }  
    public static String unescape(String s) {  
        StringBuffer sbuf = new StringBuffer();  
        int i = 0;  
        int len = s.length();  
        while (i < len) {  
            int ch = s.charAt(i);  
            if (ch == '+') {                        // + : map to ' '   
                sbuf.append(' ');  
            } else if ('A' <= ch && ch <= 'Z') {    // 'A'..'Z' : as it was  
                sbuf.append((char)ch);  
            } else if ('a' <= ch && ch <= 'z') {    // 'a'..'z' : as it was  
                sbuf.append((char)ch);  
            } else if ('0' <= ch && ch <= '9') {    // '0'..'9' : as it was  
                sbuf.append((char)ch);  
            } else if (ch == '-' || ch == '_'       // unreserved : as it was  
                || ch == '.' || ch == '!'  
                || ch == '~' || ch == '*'  
                || ch == '/'' || ch == '('  
                || ch == ')') {  
                sbuf.append((char)ch);  
            } else if (ch == '%') {  
                int cint = 0;  
                if ('u' != s.charAt(i+1)) {         // %XX : map to ascii(XX)  
                    cint = (cint << 4) | val[s.charAt(i+1)];  
                    cint = (cint << 4) | val[s.charAt(i+2)];  
                    i+=2;  
                } else {                            // %uXXXX : map to unicode(XXXX)  
                    cint = (cint << 4) | val[s.charAt(i+2)];  
                    cint = (cint << 4) | val[s.charAt(i+3)];  
                    cint = (cint << 4) | val[s.charAt(i+4)];  
                    cint = (cint << 4) | val[s.charAt(i+5)];  
                    i+=5;  
                }  
                sbuf.append((char)cint);  
            }  
            i++;  
        }  
        return sbuf.toString();  
    }  
    public static void main(String[] args) {  
        String stest = "黄修群1234 abcd[]()<+>,.~//";  
        System.out.println(stest);  
        System.out.println(escape(stest));  
        System.out.println(unescape(escape(stest)));  
    }  
}  
上面的是一个类,你当做工具类来用,调用它的解密方法试试
朝霞清辉 2019-07-03
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解铃还须系铃人
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引用 楼主 兔子家族-二哥 的回复:
如果都在前端 JS 加密那就unescape解密就行了,我JAVA新手,做.net得被逼上梁山了,求解。


引用 2 楼 安优小青和他的程序生活 的回复:
你按照他前端的加密方式对应的解密, 提前知道它解密用了什么加密方式。


引用 3 楼 cwmlow 的回复:
加密的算法找前端拿,看算法 自己写解密算法



escape 标题不是写了么。。。。。。。。。JS escape 加密
cwmlow 2019-07-01
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加密的算法找前端拿,看算法 自己写解密算法
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你按照他前端的加密方式对应的解密, 提前知道它解密用了什么加密方式。
weixin_42392002 2019-07-01
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加密方式有很多啊,有的甚至不是加密只是转码,你要和他沟通知道他的加密方式才能解密。
一、Java基础知识 1.Java有那些基本数据类型,String是不是基本数据类型,他们有何区别。 2.字符串的操作: 写一个方法,实现字符串的反转,如:输入abc,输出cba 写一个方法,实现字符串的替换,如:输入bbbwlirbbb,输出bbbhhtccc。 3.数据类型之间的转换 如何将数值型字符转换为数字(Integer,Double) 如何将数字转换为字符 如何取小数点前两位,并四舍五入。 4.日期和时间 如何取得年月日,小时分秒 如何取得从1970年到现在的毫秒数 如何获取某个日期是当月的最后一天 如何格式化日期 5.数组和集合 6.文件和目录(I/O)操作 如何列出某个目录下的所有文件 如何列出某个目录下的所有子目录 判断一个文件或目录是否存在 如何读写文件 7.Java多态的实现(继承、重载、覆盖) 8.编码转换,怎样实现将GB2312编码的字符串转换为ISO-8859-1编码的字符串。 9.Java中访问数据库的步骤,Statement和PreparedStatement之间的区别。 10.找出下列代码可能存在的错误,并说明原因: 二、JSP&Servlet技术 1.描述JSP和Servlet的区别、共同点、各自应用的范围 2.在Web开发中需要处理HTML标记时,应做什么样的处理,要筛选那些字符( & “”) 3.在JSP中如何读取客户端的请求,如何访问CGI变量,如何确定某个Jsp文件的真实路径。 4.描述Cookie和Session的作用,区别和各自的应用范围,Session工作原理。 5.列出Jsp中包含外部文件的方式,两者有何区别。 6.说明Jsp中errorPage的作用,应用范围。 7.介绍在Jsp中如何使用JavaBeans。 8.简单介绍JSP的标记库 9.Jsp和Servlet中的请求转发分别如何实现。 三、J2EE相关知识 1.介绍J2EE、J2SE、J2SE的区别。 2.J2EE是一种技术还是一种平台,他提供了那些技术。 3.什么是Application Server,它有什么功能和优点。 4.简单介绍连接池的优点和原理。 5.Web.xml的作用 四、其他 1.Web安全性的考虑(表单验证、浏览器Basic方式的验证,应用程序的安全性,SSL,代码考虑) 2.简单介绍您所了解的MVC。 3.简单介绍所了解的XML。 4.文档和编码规范 5.Java中的分页、效率考虑。 6.简单介绍您所了解的structs。

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