blocks|key|708022|text|Java中的String对象使用不能修改的UTF16编码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|708023|唯一可以使用不同编码的是byte[]。因此，如果您需要UTF-8数据，那么就需要一个byte[]。如果你有一个包含意外数据的String，那么问题出在之前的某个地方，它错误地将一些二进制数据转换为String+(即，它使用了错误的编码)。|708024|entityMap^0|6|6|0|C|6|16|6|1Q|6|2Q|6|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$]]

<code>String</code> objects in Java use the UTF-16 encoding that can't be modified.

The only thing that can have a different encoding is a <code>byte[]</code>. So if you need UTF-8 data, then you need a <code>byte[]</code>. If you have a <code>String</code> that contains unexpected data, then the problem is at some earlier place that incorrectly converted some binary data to a <code>String</code> (i.e. it was using the wrong encoding).

blocks|key|707979|text|如何使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|707980|ByteBuffer+byteBuffer+=+StandardCharsets.UTF_8.encode(myString)|code-block|syntax|javascript|707981|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

How about using

<pre><code>ByteBuffer byteBuffer = StandardCharsets.UTF_8.encode(myString)
</code></pre>

blocks|key|924657|text|在Java7中，您可以使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924658|import+static+java.nio.charset.StandardCharsets.*;

byte[]+ptext+=+myString.getBytes(ISO_8859_1);+
String+value+=+new+String(ptext,+UTF_8);+|code-block|syntax|javascript|924659|与getBytes(String)相比，它的优点是不需要声明throws+UnsupportedEncodingException。|offset|length|style|CODE|924660|如果您使用的是较旧的Java版本，则可以自己声明字符集常量：|924661|import+java.nio.charset.Charset;

public+class+StandardCharsets+{
++++public+static+final+Charset+ISO_8859_1+=+Charset.forName("ISO-8859-1");
++++public+static+final+Charset+UTF_8+=+Charset.forName("UTF-8");
++++//....
}|924662|entityMap^0|0|0|1|G|U|Z|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

In Java7 you can use:

<pre><code>import static java.nio.charset.StandardCharsets.*;

byte[] ptext = myString.getBytes(ISO_8859_1); 
String value = new String(ptext, UTF_8); 
</code></pre>

This has the advantage over <code>getBytes(String)</code> that it does not declare <code>throws UnsupportedEncodingException</code>.

If you're using an older Java version you can declare the charset constants yourself:

<pre><code>import java.nio.charset.Charset;

public class StandardCharsets {
 public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 public static final Charset UTF_8 = Charset.forName("UTF-8");
 //....
}
</code></pre>

blocks|key|924299|text|使用byte[]+ptext+=+String.getBytes("UTF-8");而不是getBytes()。getBytes()使用所谓的“默认编码”，它可能不是UTF-8。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|924300|entityMap^0|2|14|19|A|1K|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Use <code>byte[] ptext = String.getBytes("UTF-8");</code> instead of <code>getBytes()</code>. <code>getBytes()</code> uses so-called "default encoding", which may not be UTF-8.

blocks|key|924523|text|Java字符串在内部总是以UTF-16编码--但您确实应该这样考虑:编码是在字符串和字节之间进行转换的一种方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924524|所以，如果你有一个编码问题，当你有了字符串的时候，就已经来不及修复了。您需要确定从文件、数据库或网络连接创建该字符串的位置。|924525|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

A Java String is internally always encoded in UTF-16 - but you really should think about it like this: an encoding is a way to translate between Strings and bytes.

So if you have an encoding problem, by the time you have String, it's too late to fix. You need to fix the place where you create that String from a file, DB or network connection.

blocks|key|924582|text|你可以试试这种方式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|924583|byte+ptext[]+=+myString.getBytes("ISO-8859-1");+
String+value+=+new+String(ptext,+"UTF-8");+|code-block|syntax|javascript|924584|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try this way.

<pre><code>byte ptext[] = myString.getBytes("ISO-8859-1"); 
String value = new String(ptext, "UTF-8"); 
</code></pre>

blocks|key|708472|text|过了一会儿，我解决了这个问题，并设法用以下方法解决了它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708473|首先，我需要导入|708474|import+java.nio.charset.Charset;|code-block|syntax|javascript|708475|然后我必须声明一个常量来使用UTF-8和ISO-8859-1|offset|length|style|CODE|708476|private+static+final+Charset+UTF_8+=+Charset.forName("UTF-8");
private+static+final+Charset+ISO+=+Charset.forName("ISO-8859-1");|708477|然后，我可以通过以下方式使用它：|708478|String+textwithaccent="Thís+ís+a+text+with+accent";
String+textwithletter="Ñandú";

text1+=+new+String(textwithaccent.getBytes(ISO),+UTF_8);
text2+=+new+String(textwithletter.getBytes(ISO),UTF_8);|708479|entityMap^0|0|0|0|E|5|K|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$K|10|L|11|M|N]|$K|12|L|13|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

In a moment I went through this problem and managed to solve it in the following way

first i need to import 

<pre><code>import java.nio.charset.Charset;
</code></pre>

Then i had to declare a constant to use <code>UTF-8</code> and <code>ISO-8859-1</code>

<pre><code>private static final Charset UTF_8 = Charset.forName("UTF-8");
private static final Charset ISO = Charset.forName("ISO-8859-1");
</code></pre>

Then I could use it in the following way:

<pre><code>String textwithaccent="Thís ís a text with accent";
String textwithletter="Ñandú";

text1 = new String(textwithaccent.getBytes(ISO), UTF_8);
text2 = new String(textwithletter.getBytes(ISO),UTF_8);
</code></pre>

blocks|key|708378|text|String+value+=+new+String(myString.getBytes("UTF-8"));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|708379|而且，如果你想从编码为"ISO-8859-1“的文本文件中读取：|unstyled|708380|String+line;
String+f+=+"C:\\MyPath\\MyFile.txt";
try+{
++++BufferedReader+br+=+Files.newBufferedReader(Paths.get(f),+Charset.forName("ISO-8859-1"));
++++while+((line+=+br.readLine())+!=+null)+{
++++++++System.out.println(new+String(line.getBytes("UTF-8")));
++++}
}+catch+(IOException+ex)+{
++++//...
}|708381|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>String value = new String(myString.getBytes("UTF-8"));
</code></pre>

and, if you want to read from text file with "ISO-8859-1" encoded:

<pre><code>String line;
String f = "C:\\MyPath\\MyFile.txt";
try {
 BufferedReader br = Files.newBufferedReader(Paths.get(f), Charset.forName("ISO-8859-1"));
 while ((line = br.readLine()) != null) {
 System.out.println(new String(line.getBytes("UTF-8")));
 }
} catch (IOException ex) {
 //...
}
</code></pre>

blocks|key|708408|text|我使用下面的代码通过指定encode格式来对特殊字符进行编码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708409|String+text+=+"This+is+an+example+é";
byte[]+byteText+=+text.getBytes(Charset.forName("UTF-8"));
//To+get+original+string+from+byte.
String+originalString=+new+String(byteText+,+"UTF-8");|code-block|syntax|javascript|708410|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I have use below code to encode the special character by specifying encode format.

<pre><code>String text = "This is an example é";
byte[] byteText = text.getBytes(Charset.forName("UTF-8"));
//To get original string from byte.
String originalString= new String(byteText , "UTF-8");
</code></pre>

blocks|key|708332|text|这解决了我的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708333|++++String+inputText+=+"some+text+with+escaped+chars"
++++InputStream+is+=+new+ByteArrayInputStream(inputText.getBytes("UTF-8"));|code-block|syntax|javascript|708334|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This solved my problem

<pre><code> String inputText = "some text with escaped chars"
 InputStream is = new ByteArrayInputStream(inputText.getBytes("UTF-8"));
</code></pre>

I have a String with a "ñ" character and I have some problems with it. I need to encode this String to UTF-8 encoding. I have tried it by this way, but it doesn't work:

<pre><code>byte ptext[] = myString.getBytes();
String value = new String(ptext, "UTF-8");
</code></pre>

How do I encode that string to utf-8?

Encode String to UTF-8

数据转换

数据库

Java

我有一个带有"ñ“字符的字符串，我对它有一些问题。我需要将这个字符串编码为UTF-8编码。我试过用这种方法，但不起作用：byte ptext[] = myString.getBytes();String value = new String(ptext, "UTF-8");如何将该字符串编码为utf-8？

问将字符串编码为UTF-8
EN

回答 10

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