摘要：
为了解决i18nproperties文件的中文必须是unicode的问题，i18nunicodeUTF-8当前需要国际化，但Java I18N资源文件的中文需要转换为unicode。虽然没有问题，但确实很不方便。通过检查ResourceBundler类的源代码，我们发现它的内部类Control在读取资源文件时使用字节流而不是字符流。找到源代码问题。我们只需要重写Control类，并使用UTF-8读取器读取资源文件。详细的代码实现如下：packagecom.feshfans。春天importjava.io。IOException；importjava.io。输入流；importjava.io。InputStreamReader；导入java.net。URL；导入java.net。URL连接；importjava.security。访问控制器；importjava.security。PrivilegedActionException；importjava.security。PrivilegeExceptionAction；导入java.util。场所导入java.util。PropertyResourceBundle；导入java.util。资源捆绑包；/***描述：*CleanUsercom.feshfans。春季*feshfans2018/5/1118:46*电子邮件：feshfans@163.com**/publicclassUTF8ControlextendsResourceBundle。控件｛@OverridepublicResourceBundlenewBundlethrowsIllegalAccessException、InstantiationException、IOException｛StringbundleName＝toBundleName；ResourceBundlebundle＝null；如果｛try｛@SuppressWarningsClass＜？
解决 i18n properties文件中文必须是unicode的问题 
i18n unicode UTF-8
目前产品需要做国际化，但 java 的 I18N 资源文件中中文必须转换成 unicode 才行。虽然并不会有问题，但实在是不方便，通过查看 ResourceBundler 类的源码，发现其内部类 Control 在读取资源文件时，使用的是字节流而非字符流。
源代码
问题找到了，我们只要重写 Control 类即可，使用 UTF-8 的 Reader 去读取资源文件即可。
详细代码实现如下：
package com.feshfans.spring;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Locale;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
/**
* DESC:
* CleanUser com.feshfans.spring
* feshfans 2018/5/11 18:46
* email: feshfans@163.com
**/
public class UTF8Control extends ResourceBundle.Control {
@Override
public ResourceBundle newBundle(String baseName, Locale locale, String format,
ClassLoader loader, boolean reload)
throws IllegalAccessException, InstantiationException, IOException {
String bundleName = toBundleName(baseName, locale);
ResourceBundle bundle = null;
if (format.equals("java.class")) {
try {
@SuppressWarnings("unchecked")
Class<? extends ResourceBundle> bundleClass
= (Class<? extends ResourceBundle>)loader.loadClass(bundleName);
// If the class isn't a ResourceBundle subclass, throw a
// ClassCastException.
if (ResourceBundle.class.isAssignableFrom(bundleClass)) {
bundle = bundleClass.newInstance();
} else {
throw new ClassCastException(bundleClass.getName()
+ " cannot be cast to ResourceBundle");
}
} catch (ClassNotFoundException e) {
}
} else if (format.equals("java.properties")) {
final String resourceName = toResourceName0(bundleName, "properties");
if (resourceName == null) {
return bundle;
}
final ClassLoader classLoader = loader;
final boolean reloadFlag = reload;
InputStream stream = null;
try {
stream = AccessController.doPrivileged(
new PrivilegedExceptionAction<InputStream>() {
public InputStream run() throws IOException {
InputStream is = null;
if (reloadFlag) {
URL url = classLoader.getResource(resourceName);
if (url != null) {
URLConnection connection = url.openConnection();
if (connection != null) {
// Disable caches to get fresh data for
// reloading.
connection.setUseCaches(false);
is = connection.getInputStream();
}
}
} else {
is = classLoader.getResourceAsStream(resourceName);
}
return is;
}
});
} catch (PrivilegedActionException e) {
throw (IOException) e.getException();
}
if (stream != null) {
try {
bundle = new PropertyResourceBundle(new InputStreamReader(stream,"UTF-8"));
} finally {
stream.close();
}
}
} else {
throw new IllegalArgumentException("unknown format: " + format);
}
return bundle;
}
private String toResourceName0(String bundleName, String suffix) {
// application protocol check
if (bundleName.contains("://")) {
return null;
} else {
return toResourceName(bundleName, suffix);
}
}
public static void main(String[] args) {
ResourceBundle.getBundle("baseName",new UTF8Control());
}
}
然后，在构建 ResourceBundler 时，使用以下方法即可:
ResourceBundle.getBundle("baseName",new UTF8Control());