blocks|key|1687912|text|我认为不可能说服客户端脱离不受支持的Java版本？如果答案是否定的，那么您唯一的办法就是使用/修改web上的一个开源实现。你在你的问题中提到了其中的两个，另一个你可能想看的是水罐。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1687913|哦，是的，您对java.util.UUID的引用失败了，因为它只在Java5和更高版本中可用。|1687914|祝好运!|1687915|entityMap|0|LINK|mutability|MUTABLE|url|http://wiki.fasterxml.com/JugHome^0|2F|2|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

I suppose there is no chance convincing the client to get off an unsupported version of Java? Which if the answer is no then your only recourse is to use/modify one of the open source implementations from the web. You mentioned two of them in your question, another one you might want to look at is <a href="http://wiki.fasterxml.com/JugHome">JUG</a>.

And oh yea, your reference to java.util.UUID failed because it's only available in Java 5 and up.

Good luck!

blocks|key|1687955|text|java.util.UUID从1.5开始添加到JDK。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1687956|对于一个简单的轻量级实现，请看一下这篇博客文章：http://lzkyo.iteye.com/blog/453120。|offset|length|1687957|entityMap|0|LINK|mutability|MUTABLE|url|http://lzkyo.iteye.com/blog/453120^0|0|O|Y|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

java.util.UUID was added to JDK since 1.5. 

For a simple lightweight implementation, take a look at this blog post: <a href="http://lzkyo.iteye.com/blog/453120" rel="nofollow">http://lzkyo.iteye.com/blog/453120</a>.

blocks|key|2885137|text|Apache+(沙箱项目，所以您必须从源代码构建，但我已经使用了它，它可以工作)：项目页，svn回购|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2885138|您也可以检查一下try+这个项目，但我还没有使用它。|2885139|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/sandbox/id/|1|http://svn.apache.org/repos/asf/commons/sandbox/id/trunk/src/java/org/apache/commons/id/uuid/|2|http://johannburkard.de/software/uuid/^0|15|3|0|19|5|1|0|C|4|2|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]|$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|F|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]]]

Apache Commons ID (sandbox project, so you have to build from source, but I've used it and it works): <a href="http://commons.apache.org/sandbox/id/" rel="nofollow">project page</a>, <a href="http://svn.apache.org/repos/asf/commons/sandbox/id/trunk/src/java/org/apache/commons/id/uuid/" rel="nofollow">svn repo</a>

You can also check try <a href="http://johannburkard.de/software/uuid/" rel="nofollow">this project</a> but I haven't used it.

blocks|key|2885156|text|在SAP中使用TechKey功能。这就是它的意义所在。此外，它还可以与ABAP表以及任何Portal和SAP+J2EE表兼容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2885157|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use the TechKey functionality within SAP ISA. that is what it is there for. Also it is compatiable with the ABAP Tables and well as any Portal and SAP J2EE Tables.

blocks|key|3241846|text|不幸的是，UUID类从1.5开始就可用了。我刚刚实现了这个实用工具类，它将UUID创建为字符串。可以自由使用和分享。我希望它能帮到别人！|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3241847|package+your.package.name;

import+java.security.SecureRandom;
import+java.util.Random;

/**
+*+Utility+class+that+creates+random-based+UUIDs+as+Strings.
+*+
+*/
public+abstract+class+RandomUuidStringCreator+{

++++private+static+final+int+RANDOM_VERSION+=+4;

++++/**
+++++*+Returns+a+random-based+UUID+as+String.
+++++*+
+++++*+It+uses+a+thread+local+{@link+SecureRandom}.
+++++*+
+++++*+@return+a+random-based+UUID+string
+++++*/
++++public+static+String+getRandomUuid()+{
++++++++return+getRandomUuid(SecureRandomLazyHolder.SECURE_RANDOM);
++++}

++++/**
+++++*+Returns+a+random-based+UUID+String.
+++++*+
+++++*+It+uses+any+instance+of+{@link+Random}.
+++++*+
+++++*+@return+a+random-based+UUID+string
+++++*/
++++public+static+String+getRandomUuid(Random+random)+{

++++++++long+msb+=+0;
++++++++long+lsb+=+0;

++++++++//+(3)+set+all+bit+randomly
++++++++if+(random+instanceof+SecureRandom)+{
++++++++++++//+Faster+for+instances+of+SecureRandom
++++++++++++final+byte[]+bytes+=+new+byte[16];
++++++++++++random.nextBytes(bytes);
++++++++++++msb+=+toNumber(bytes,+0,+8);+//+first+8+bytes+for+MSB
++++++++++++lsb+=+toNumber(bytes,+8,+16);+//+last+8+bytes+for+LSB
++++++++}+else+{
++++++++++++msb+=+random.nextLong();+//+first+8+bytes+for+MSB
++++++++++++lsb+=+random.nextLong();+//+last+8+bytes+for+LSB
++++++++}

++++++++//+Apply+version+and+variant+bits+(required+for+RFC-4122+compliance)
++++++++msb+=+(msb+&+0xffffffffffff0fffL)+%7C+(RANDOM_VERSION+&+0x0f)+<<+12;+//+apply+version+bits
++++++++lsb+=+(lsb+&+0x3fffffffffffffffL)+%7C+0x8000000000000000L;+//+apply+variant+bits

++++++++//+Convert+MSB+and+LSB+to+hexadecimal
++++++++String+msbHex+=+zerofill(Long.toHexString(msb),+16);
++++++++String+lsbHex+=+zerofill(Long.toHexString(lsb),+16);

++++++++//+Return+the+UUID
++++++++return+format(msbHex+%2B+lsbHex);
++++}

++++private+static+long+toNumber(final+byte[]+bytes,+final+int+start,+final+int+length)+{
++++++++long+result+=+0;
++++++++for+(int+i+=+start;+i+<+length;+i%2B%2B)+{
++++++++++++result+=+(result+<<+8)+%7C+(bytes[i]+&+0xff);
++++++++}
++++++++return+result;
++++}

++++private+static+String+zerofill(String+string,+int+length)+{
++++++++return+new+String(lpad(string.toCharArray(),+length,+'0'));
++++}

++++private+static+char[]+lpad(char[]+chars,+int+length,+char+fill)+{

++++++++int+delta+=+0;
++++++++int+limit+=+0;

++++++++if+(length+>+chars.length)+{
++++++++++++delta+=+length+-+chars.length;
++++++++++++limit+=+length;
++++++++}+else+{
++++++++++++delta+=+0;
++++++++++++limit+=+chars.length;
++++++++}

++++++++char[]+output+=+new+char[chars.length+%2B+delta];
++++++++for+(int+i+=+0;+i+<+limit;+i%2B%2B)+{
++++++++++++if+(i+<+delta)+{
++++++++++++++++output[i]+=+fill;
++++++++++++}+else+{
++++++++++++++++output[i]+=+chars[i+-+delta];
++++++++++++}
++++++++}
++++++++return+output;
++++}

++++private+static+String+format(String+string)+{
++++++++char[]+input+=+string.toCharArray();
++++++++char[]+output+=+new+char[36];

++++++++System.arraycopy(input,+0,+output,+0,+8);
++++++++System.arraycopy(input,+8,+output,+9,+4);
++++++++System.arraycopy(input,+12,+output,+14,+4);
++++++++System.arraycopy(input,+16,+output,+19,+4);
++++++++System.arraycopy(input,+20,+output,+24,+12);

++++++++output[8]+=+'-';
++++++++output[13]+=+'-';
++++++++output[18]+=+'-';
++++++++output[23]+=+'-';

++++++++return+new+String(output);
++++}

++++//+Holds+lazy+secure+random
++++private+static+class+SecureRandomLazyHolder+{
++++++++static+final+Random+SECURE_RANDOM+=+new+SecureRandom();
++++}

++++/**
+++++*+For+tests!
+++++*/
++++public+static+void+main(String[]+args)+{

++++++++System.out.println("//+Using+thread+local+`java.security.SecureRandom`+(DEFAULT)");
++++++++System.out.println("RandomUuidCreator.getRandomUuid()");
++++++++System.out.println();
++++++++for+(int+i+=+0;+i+<+5;+i%2B%2B)+{
++++++++++++System.out.println(RandomUuidStringCreator.getRandomUuid());
++++++++}

++++++++System.out.println();
++++++++System.out.println("//+Using+`java.util.Random`+(FASTER)");
++++++++System.out.println("RandomUuidCreator.getRandomUuid(new+Random())");
++++++++System.out.println();
++++++++Random+random+=+new+Random();
++++++++for+(int+i+=+0;+i+<+5;+i%2B%2B)+{
++++++++++++System.out.println(RandomUuidStringCreator.getRandomUuid(random));
++++++++}
++++}
}|code-block|syntax|javascript|3241848|这是输出：|3241849|//+Using+`java.security.SecureRandom`+(DEFAULT)
RandomUuidStringCreator.getRandomUuid()

'c4d1b0ec-c03a-4430-b210-bd692456d8f4'
'ddad65fb-aef9-4309-842d-284cef70e5f6'
'8b37cd8c-7390-4683-abed-524f97626995'
'd84b19bd-1fdb-4d76-ab7a-a845939c6934'
'ddb48e15-9512-4802-ace9-724d766643c6'

//+Using+`java.util.Random`+(FASTER)
RandomUuidStringCreator.getRandomUuid(new+Random())

'fa0a4861-6fa0-4258-8c8d-c89db9730b3e'
'bfe794fa-fe34-4ec3-aa93-5ec2e0897150'
'4c6441d8-10b5-4d8e-8dcf-6f1889d675e1'
'6f3012b7-e846-4173-8ffc-3a6e41893ea7'
'b73125a8-60f1-4dfd-b9fe-1a27aeb133a8'|3241850|entityMap^0|18|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

Unfortunately the UUID class is available since 1.5. I just implemented this utility class that creates UUIDs as String. Fell free to use and share. I hope it helps someone else!
<pre class="lang-java prettyprint-override"><code>
package your.package.name;

import java.security.SecureRandom;
import java.util.Random;

/**
 * Utility class that creates random-based UUIDs as Strings.
 * 
 */
public abstract class RandomUuidStringCreator {

 private static final int RANDOM_VERSION = 4;

 /**
 * Returns a random-based UUID as String.
 * 
 * It uses a thread local {@link SecureRandom}.
 * 
 * @return a random-based UUID string
 */
 public static String getRandomUuid() {
 return getRandomUuid(SecureRandomLazyHolder.SECURE_RANDOM);
 }

 /**
 * Returns a random-based UUID String.
 * 
 * It uses any instance of {@link Random}.
 * 
 * @return a random-based UUID string
 */
 public static String getRandomUuid(Random random) {

 long msb = 0;
 long lsb = 0;

 // (3) set all bit randomly
 if (random instanceof SecureRandom) {
 // Faster for instances of SecureRandom
 final byte[] bytes = new byte[16];
 random.nextBytes(bytes);
 msb = toNumber(bytes, 0, 8); // first 8 bytes for MSB
 lsb = toNumber(bytes, 8, 16); // last 8 bytes for LSB
 } else {
 msb = random.nextLong(); // first 8 bytes for MSB
 lsb = random.nextLong(); // last 8 bytes for LSB
 }

 // Apply version and variant bits (required for RFC-4122 compliance)
 msb = (msb &amp; 0xffffffffffff0fffL) | (RANDOM_VERSION &amp; 0x0f) &lt;&lt; 12; // apply version bits
 lsb = (lsb &amp; 0x3fffffffffffffffL) | 0x8000000000000000L; // apply variant bits

 // Convert MSB and LSB to hexadecimal
 String msbHex = zerofill(Long.toHexString(msb), 16);
 String lsbHex = zerofill(Long.toHexString(lsb), 16);

 // Return the UUID
 return format(msbHex + lsbHex);
 }

 private static long toNumber(final byte[] bytes, final int start, final int length) {
 long result = 0;
 for (int i = start; i &lt; length; i++) {
 result = (result &lt;&lt; 8) | (bytes[i] &amp; 0xff);
 }
 return result;
 }

 private static String zerofill(String string, int length) {
 return new String(lpad(string.toCharArray(), length, '0'));
 }

 private static char[] lpad(char[] chars, int length, char fill) {

 int delta = 0;
 int limit = 0;

 if (length &gt; chars.length) {
 delta = length - chars.length;
 limit = length;
 } else {
 delta = 0;
 limit = chars.length;
 }

 char[] output = new char[chars.length + delta];
 for (int i = 0; i &lt; limit; i++) {
 if (i &lt; delta) {
 output[i] = fill;
 } else {
 output[i] = chars[i - delta];
 }
 }
 return output;
 }

 private static String format(String string) {
 char[] input = string.toCharArray();
 char[] output = new char[36];

 System.arraycopy(input, 0, output, 0, 8);
 System.arraycopy(input, 8, output, 9, 4);
 System.arraycopy(input, 12, output, 14, 4);
 System.arraycopy(input, 16, output, 19, 4);
 System.arraycopy(input, 20, output, 24, 12);

 output[8] = '-';
 output[13] = '-';
 output[18] = '-';
 output[23] = '-';

 return new String(output);
 }

 // Holds lazy secure random
 private static class SecureRandomLazyHolder {
 static final Random SECURE_RANDOM = new SecureRandom();
 }

 /**
 * For tests!
 */
 public static void main(String[] args) {

 System.out.println(&quot;// Using thread local `java.security.SecureRandom` (DEFAULT)&quot;);
 System.out.println(&quot;RandomUuidCreator.getRandomUuid()&quot;);
 System.out.println();
 for (int i = 0; i &lt; 5; i++) {
 System.out.println(RandomUuidStringCreator.getRandomUuid());
 }

 System.out.println();
 System.out.println(&quot;// Using `java.util.Random` (FASTER)&quot;);
 System.out.println(&quot;RandomUuidCreator.getRandomUuid(new Random())&quot;);
 System.out.println();
 Random random = new Random();
 for (int i = 0; i &lt; 5; i++) {
 System.out.println(RandomUuidStringCreator.getRandomUuid(random));
 }
 }
}

</code></pre>
This is the output:
<pre><code>// Using `java.security.SecureRandom` (DEFAULT)
RandomUuidStringCreator.getRandomUuid()

'c4d1b0ec-c03a-4430-b210-bd692456d8f4'
'ddad65fb-aef9-4309-842d-284cef70e5f6'
'8b37cd8c-7390-4683-abed-524f97626995'
'd84b19bd-1fdb-4d76-ab7a-a845939c6934'
'ddb48e15-9512-4802-ace9-724d766643c6'

// Using `java.util.Random` (FASTER)
RandomUuidStringCreator.getRandomUuid(new Random())

'fa0a4861-6fa0-4258-8c8d-c89db9730b3e'
'bfe794fa-fe34-4ec3-aa93-5ec2e0897150'
'4c6441d8-10b5-4d8e-8dcf-6f1889d675e1'
'6f3012b7-e846-4173-8ffc-3a6e41893ea7'
'b73125a8-60f1-4dfd-b9fe-1a27aeb133a8'
</code></pre>

I need to create a UUID or GUID in java 1.4. I get a classnotfound exception when i use: java.util.UUID.

There are similar questions here linked below, but none answer with a generator for Java 1.4:

<ul>
<li><a href="https://stackoverflow.com/questions/325443/generate-uuid-in-java">Likelihood of collision using most significant bits of a UUID in Java</a></li>
<li><a href="https://stackoverflow.com/questions/2982748/create-a-guid-in-java">Create a GUID in Java</a></li>
</ul>

I have also found a few classes online:

<ul>
<li><a href="http://johannburkard.de/software/uuid/" rel="nofollow noreferrer">http://johannburkard.de/software/uuid/</a></li>
<li><a href="http://jackrabbit.apache.org/api/1.4/org/apache/jackrabbit/uuid/UUID.html" rel="nofollow noreferrer">http://jackrabbit.apache.org/api/1.4/org/apache/jackrabbit/uuid/UUID.html</a></li>
</ul>

What would you suggest I use to create a UUID or GUID in java 1.4?

How to create a UUID or GUID in Java 1.4

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要在java1.4中创建一个UUID或GUID。当我使用: java.util.UUID时，我会得到一个未找到类的异常。这里有类似的问题链接在下面，但是没有一个用Java1.4生成器来回答：我还在网上发现了一些课程：您建议我使用什么来创建Java1.4中的UUID或GUID？

问如何在Java1.4中创建UUID或GUID
EN

回答 5

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回答 5

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问如何在Java1.4中创建UUID或GUID
EN