java使用redis时，中文乱码问题

今天测试项目时发现页面有些数据乱码了，检查了一下发现数据存入redis还是中文，取出来就乱码了T T

代码：

/** 存入相应的key和value,并设置其生命周期（单位秒）
* @param key
* @param value
* @param liveTime
* @throws Exception
*/
public void set(String key, String value, long liveTime) throws Exception {
this.set(key.getBytes(), value.getBytes(), liveTime);
}

/** 根据key取出对应的数据
* @param key
* @return
*/
public String get(final String key) {
return redisTemplate.execute(new RedisCallback<String>() {
public String doInRedis(RedisConnection connection) throws DataAccessException {
try {
byte[] b = connection.get(key.getBytes());
if(b==null){
return null;
}
return new String(b, "utf-8");

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return "";
}
});
}

这里查了一下String的getBytes()方法的源码，如果你不设置编码集，默认的编码集是 “ISO-8859-1”，源码：

/**
* Encodes this {@code String} into a sequence of bytes using the
* platform's default charset, storing the result into a new byte array.
*
* <p> The behavior of this method when this string cannot be encoded in
* the default charset is unspecified.  The {@link
* java.nio.charset.CharsetEncoder} class should be used when more control
* over the encoding process is required.
*
* @return  The resultant byte array
*
* @since      JDK1.1
*/
public byte[] getBytes() {
return StringCoding.encode(value, 0, value.length);
}

static byte[] encode(char[] ca, int off, int len) {
String csn = Charset.defaultCharset().name();
try {
// use charset name encode() variant which provides caching.
return encode(csn, ca, off, len);
} catch (UnsupportedEncodingException x) {
warnUnsupportedCharset(csn);
}
try {
return encode("ISO-8859-1", ca, off, len);
} catch (UnsupportedEncodingException x) {
// If this code is hit during VM initialization, MessageUtils is
// the only way we will be able to get any kind of error message.
MessageUtils.err("ISO-8859-1 charset not available: "
+ x.toString());
// If we can not find ISO-8859-1 (a required encoding) then things
// are seriously wrong with the installation.
System.exit(1);
return null;
}
}

static byte[] encode(String charsetName, char[] ca, int off, int len)
throws UnsupportedEncodingException
{
StringEncoder se = deref(encoder);
String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
if ((se == null) || !(csn.equals(se.requestedCharsetName())
|| csn.equals(se.charsetName()))) {
se = null;
try {
Charset cs = lookupCharset(csn);
if (cs != null)
se = new StringEncoder(cs, csn);
} catch (IllegalCharsetNameException x) {}
if (se == null)
throw new UnsupportedEncodingException (csn);
set(encoder, se);
}
return se.encode(ca, off, len);
}

我们只需要在设置key对应的value时设置对应的字符集与取出来的一直即可，在此我们设置为 “utf-8”,代码如下：

/**
* @param key
* @param value
* @param liveTime
* @throws Exception
*/
public void set(String key, String value, long liveTime) throws Exception {
this.set(key.getBytes("utf-8"), value.getBytes("utf-8"), liveTime);
}

查阅资料时，发现直接操作redis也会有乱码的情况，记录一下

redis> set test "我们"
OK
redis> get test
"\xe6\x88\x91\xe4\xbb\xac"

如何在get时取到它的中文呢？只需要在redis-cli 后面加上 –raw

redis> get test
"我们"

感谢 http://blog.csdn.net/cwallow/article/details/8690309