小鱼儿主页高手论坛2.在JSP中设置下拉列表框的此

2019-07-13 作者:小鱼儿主页高手论坛   |   浏览(56)

本文实例讲述了JQuery实现Ajax加载图片的方法。分享给大家供大家参考,具体如下:

在网上查了一下,在网上收集了Java与JavaScript中使用的两个例子,试验过,分享下。
1、Java:

本文实例讲述了JS设置下拉列表框当前所选值的方法。分享给大家供大家参考,具体如下:

本文实例讲述了javascript生成img标签的3种实现方法。分享给大家供大家参考,具体如下:

最近在学习JQuery,想从原理上模拟一下无刷新的相册浏览。

package org.bearfly.test.md5;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
 public static void main(String[] args){
 System.out.println(getMd5String(""));
 System.out.println(MD5("good"));
 }


 public final static String MD5(String s) {
 char hexDigits[] = { '0', '1', '2', '3', '4',
    '5', '6', '7', '8', '9',
    'A', 'B', 'C', 'D', 'E', 'F' };
 try {
  byte[] btInput = s.getBytes();
 //获得MD5摘要算法的 MessageDigest 对象
  MessageDigest mdInst = MessageDigest.getInstance("MD5");
 //使用指定的字节更新摘要
  mdInst.update(btInput);
 //获得密文
  byte[] md = mdInst.digest();
 //把密文转换成十六进制的字符串形式
  int j = md.length;
  char str[] = new char[j * 2];
  int k = 0;
  for (int i = 0; i < j; i  ) {
  byte byte0 = md[i];
  str[k  ] = hexDigits[byte0 >>> 4 & 0xf];
  str[k  ] = hexDigits[byte0 & 0xf];
  }
  return new String(str);
 }
 catch (Exception e) {
  e.printStackTrace();
  return null;
 }
 }



 public static String getMd5String(String str){
 MessageDigest messageDigest = null; 

 try { 
  messageDigest = MessageDigest.getInstance("MD5"); 

  messageDigest.reset(); 

  messageDigest.update(str.getBytes("UTF-8")); 
 } catch (NoSuchAlgorithmException e) { 
  System.out.println("NoSuchAlgorithmException caught!"); 
  System.exit(-1); 
 } catch (UnsupportedEncodingException e) { 
  e.printStackTrace(); 
 } 

 byte[] byteArray = messageDigest.digest(); 

 StringBuffer md5StrBuff = new StringBuffer(); 

 for (int i = 0; i < byteArray.length; i  ) {  
  if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) 
  md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i])); 
  else 
  md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i])); 
 } 

 return md5StrBuff.toString(); 
 }
}
  1. JS代码:
<div id="d1"></div>
<script>
//HTML
function a(){
document.getElementById("d1").innerHTML="<img src='http://www.jnhainuoer.com/uploads/allimg/190713/1033054550-0.jpg'>";
}
a();
//方法
function b(){
var d1=document.getElementById("d1");
var img=document.createElement("img");
img.src="http://www.jnhainuoer.com/uploads/allimg/190713/1033054550-0.jpg";
d1.appendChild(img);
}
b();
//对象
function c(){
var cc=new Image();
cc.src="http://www.jnhainuoer.com/uploads/allimg/190713/1033054550-0.jpg";
document.getElementById("d1").appendChild(cc);
}
c();
</script>

最先想到的思路是利用缓存,也就是先显示提示消息,然后get图片,在get完的时候回调,将img标签的src改掉,由于刚刚get过,有了缓存,所以图片会立刻显示出来。

2、JavaScript:
**
md5.js
**

function setSelectOption(objId, targetValue){
//objid:下拉列表框的ID;targetValue:当前所选值
 var obj = document.getElementById(objId);
 if(obj){
  var options = obj.options;
  if(options){
   var len = options.length;
   for(var i=0;i<len;i  ){
    if(options[i].value == targetValue){
     options[i].defaultSelected = true;
     options[i].selected = true;
     return true;
    }
   }
  } else {
   alert('missing element(s)!');
  }
 } else {
  alert('missing element(s)!');
 }
}

希望本文所述对大家JavaScript程序设计有所帮助。

页面元素:

var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}
function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}
function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}
function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }
function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }
function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
function core_md5(x, len)
{
 /* append padding */
 x[len >> 5] |= 0x80 << ((len) % 32);
 x[(((len   64) >>> 9) << 4)   14] = len;

 var a = 1732584193;
 var b = -271733879;
 var c = -1732584194;
 var d = 271733878;

 for(var i = 0; i < x.length; i  = 16)
 {
 var olda = a;
 var oldb = b;
 var oldc = c;
 var oldd = d;

 a = md5_ff(a, b, c, d, x[i  0], 7 , -680876936);
 d = md5_ff(d, a, b, c, x[i  1], 12, -389564586);
 c = md5_ff(c, d, a, b, x[i  2], 17, 606105819);
 b = md5_ff(b, c, d, a, x[i  3], 22, -1044525330);
 a = md5_ff(a, b, c, d, x[i  4], 7 , -176418897);
 d = md5_ff(d, a, b, c, x[i  5], 12, 1200080426);
 c = md5_ff(c, d, a, b, x[i  6], 17, -1473231341);
 b = md5_ff(b, c, d, a, x[i  7], 22, -45705983);
 a = md5_ff(a, b, c, d, x[i  8], 7 , 1770035416);
 d = md5_ff(d, a, b, c, x[i  9], 12, -1958414417);
 c = md5_ff(c, d, a, b, x[i 10], 17, -42063);
 b = md5_ff(b, c, d, a, x[i 11], 22, -1990404162);
 a = md5_ff(a, b, c, d, x[i 12], 7 , 1804603682);
 d = md5_ff(d, a, b, c, x[i 13], 12, -40341101);
 c = md5_ff(c, d, a, b, x[i 14], 17, -1502002290);
 b = md5_ff(b, c, d, a, x[i 15], 22, 1236535329);

 a = md5_gg(a, b, c, d, x[i  1], 5 , -165796510);
 d = md5_gg(d, a, b, c, x[i  6], 9 , -1069501632);
 c = md5_gg(c, d, a, b, x[i 11], 14, 643717713);
 b = md5_gg(b, c, d, a, x[i  0], 20, -373897302);
 a = md5_gg(a, b, c, d, x[i  5], 5 , -701558691);
 d = md5_gg(d, a, b, c, x[i 10], 9 , 38016083);
 c = md5_gg(c, d, a, b, x[i 15], 14, -660478335);
 b = md5_gg(b, c, d, a, x[i  4], 20, -405537848);
 a = md5_gg(a, b, c, d, x[i  9], 5 , 568446438);
 d = md5_gg(d, a, b, c, x[i 14], 9 , -1019803690);
 c = md5_gg(c, d, a, b, x[i  3], 14, -187363961);
 b = md5_gg(b, c, d, a, x[i  8], 20, 1163531501);
 a = md5_gg(a, b, c, d, x[i 13], 5 , -1444681467);
 d = md5_gg(d, a, b, c, x[i  2], 9 , -51403784);
 c = md5_gg(c, d, a, b, x[i  7], 14, 1735328473);
 b = md5_gg(b, c, d, a, x[i 12], 20, -1926607734);

 a = md5_hh(a, b, c, d, x[i  5], 4 , -378558);
 d = md5_hh(d, a, b, c, x[i  8], 11, -2022574463);
 c = md5_hh(c, d, a, b, x[i 11], 16, 1839030562);
 b = md5_hh(b, c, d, a, x[i 14], 23, -35309556);
 a = md5_hh(a, b, c, d, x[i  1], 4 , -1530992060);
 d = md5_hh(d, a, b, c, x[i  4], 11, 1272893353);
 c = md5_hh(c, d, a, b, x[i  7], 16, -155497632);
 b = md5_hh(b, c, d, a, x[i 10], 23, -1094730640);
 a = md5_hh(a, b, c, d, x[i 13], 4 , 681279174);
 d = md5_hh(d, a, b, c, x[i  0], 11, -358537222);
 c = md5_hh(c, d, a, b, x[i  3], 16, -722521979);
 b = md5_hh(b, c, d, a, x[i  6], 23, 76029189);
 a = md5_hh(a, b, c, d, x[i  9], 4 , -640364487);
 d = md5_hh(d, a, b, c, x[i 12], 11, -421815835);
 c = md5_hh(c, d, a, b, x[i 15], 16, 530742520);
 b = md5_hh(b, c, d, a, x[i  2], 23, -995338651);

 a = md5_ii(a, b, c, d, x[i  0], 6 , -198630844);
 d = md5_ii(d, a, b, c, x[i  7], 10, 1126891415);
 c = md5_ii(c, d, a, b, x[i 14], 15, -1416354905);
 b = md5_ii(b, c, d, a, x[i  5], 21, -57434055);
 a = md5_ii(a, b, c, d, x[i 12], 6 , 1700485571);
 d = md5_ii(d, a, b, c, x[i  3], 10, -1894986606);
 c = md5_ii(c, d, a, b, x[i 10], 15, -1051523);
 b = md5_ii(b, c, d, a, x[i  1], 21, -2054922799);
 a = md5_ii(a, b, c, d, x[i  8], 6 , 1873313359);
 d = md5_ii(d, a, b, c, x[i 15], 10, -30611744);
 c = md5_ii(c, d, a, b, x[i  6], 15, -1560198380);
 b = md5_ii(b, c, d, a, x[i 13], 21, 1309151649);
 a = md5_ii(a, b, c, d, x[i  4], 6 , -145523070);
 d = md5_ii(d, a, b, c, x[i 11], 10, -1120210379);
 c = md5_ii(c, d, a, b, x[i  2], 15, 718787259);
 b = md5_ii(b, c, d, a, x[i  9], 21, -343485551);

 a = safe_add(a, olda);
 b = safe_add(b, oldb);
 c = safe_add(c, oldc);
 d = safe_add(d, oldd);
 }
 return Array(a, b, c, d);

}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
function core_hmac_md5(key, data)
{
 var bkey = str2binl(key);
 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

 var ipad = Array(16), opad = Array(16);
 for(var i = 0; i < 16; i  )
 {
 ipad[i] = bkey[i] ^ 0x36363636;
 opad[i] = bkey[i] ^ 0x5C5C5C5C;
 }

 var hash = core_md5(ipad.concat(str2binl(data)), 512   data.length * chrsz);
 return core_md5(opad.concat(hash), 512   128);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
 var lsw = (x & 0xFFFF)   (y & 0xFFFF);
 var msw = (x >> 16)   (y >> 16)   (lsw >> 16);
 return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
 return (num << cnt) | (num >>> (32 - cnt));
}

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
function str2binl(str)
{
 var bin = Array();
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < str.length * chrsz; i  = chrsz)
 bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i2);
 return bin;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2str(bin)
{
 var str = "";
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < bin.length * 32; i  = chrsz)
 str  = String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
 return str;
}

/*
 * Convert an array of little-endian words to a hex string.
 */
function binl2hex(binarray)
{
 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i  )
 {
 str  = hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 4)) & 0xF)  
  hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF);
 }
 return str;
}

/*
 * Convert an array of little-endian words to a base-64 string
 */
function binl2b64(binarray)
{
 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 /";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i  = 3)
 {
 var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16)
  | (((binarray[i 1 >> 2] >> 8 * ((i 1)%4)) & 0xFF) << 8 )
  | ((binarray[i 2 >> 2] >> 8 * ((i 2)%4)) & 0xFF);
 for(var j = 0; j < 4; j  )
 {
 if(i * 8   j * 6 > binarray.length * 32) str  = b64pad;
 else str  = tab.charAt((triplet >> 6*(3-j)) & 0x3F);
 }
 }
 return str;
}

2.在JSP中设置下拉列表框的当前选择项

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<input class="picbtn" type="button" value="Next" />
<div class="tip">正在加载……</div>
<div class="notice">
<img />
</div>

md5.html

<select>
  <option value="1" <%if(sesssionValue==1){%> selected="selected"<%}%>>1:b </option>
  <option value="2" <%if(sesssionValue==2){%> selected="selected"<%}%>>2:b </option>
  <option value="3" <%if(sesssionValue==3){%> selected="selected"<%}%>>3:c </option>
  <option value="4" <%if(sesssionValue==4){%> selected="selected"<%}%>>4:d </option>
</select>

按钮的事件绑定:

<html>
 <head>
 <title>md5_Test</title>
 <script type="text/javascript" src="md5.js"></script>
 <link rel="stylesheet" type="text/css" href="bearfly.css" />
 </head>
 <body>
 <script type="text/javascript">
  document.write("myPassword MD5: ",hex_md5("md5Test").toUpperCase());
 </script>
 </body>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。

复制代码 代码如下:

补充:javascript 的MD5代码备份,跟java互通

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