在 Java 中直接使用Unicode 转码时会按照UTF-16LE 的方式拆分，并加上 BOM。 如果采用 UTF-16 拆分，在 Java 中默认采用带有 BOM 的 UTF-16BE 拆分。
String a ="12dss显示,‘；（）中文只";
StringBuffer b = new StringBuffer();
for(int i = 0;i<a.length();i++)
{
char t = a.charAt(i);
String str = String.valueOf(t);
if(str.getBytes().length ==2)
{
b.append(str); }
}
System.out.println(b);
结果: 显示‘；（）中文只
java：获取字符串中第一个汉字和第一个汉字汉字标点符号的位置？
package tool; public class CopyCat
{
public static void main ( String[] args )
{
String string = "adf你.？的说法sdf";
String reg = "[\u4e00-\u9fa5]";
int index = -1;
if (string.matches (".*" + reg + ".*"))
{
index = string.split (reg)[0].length ();
}
System.out.println (index);
String regex = "[。，！？（）《》……、：——【】；’”‘“]";
int ind = -1;
if (string.matches (".*" + regex + ".*"))
{
ind = string.split (regex)[0].length ();
}
System.out.println (ind);
}
}
常用汉字 的unicode 码范围是：\u4e00-\u9fa5，下面一个例子是把中英文文档中的汉字提取出来的简单例子：
public class DrawEnglish
{
private static String draw(String content)
{
StringBuffer english = new StringBuffer();
String regex = "[\u4e00-\u9fa5。，？”“《》：！——-、]";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(content);
while(matcher.find())
{
String temp = matcher.group();
english.append(temp);
}
return english.toString();
}
public static void drawEnglish(String path)
{
FileInputStream fr;
BufferedReader br;
FileWriter fw;
BufferedWriter bw = null ;
try
{
fr = new FileInputStream(path);
br = new BufferedReader(new InputStreamReader(fr,"gb2312"));
fw = new FileWriter("new1.txt");
bw = new BufferedWriter(fw);
String str = null;
StringBuffer sb = new StringBuffer();
while((str = br.readLine()) != null)
{
sb.append(str + "\n");
}
String temp = draw(sb.toString());
bw.write(temp);
} catch (FileNotFoundException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
finally
{
try
{
if(bw != null) bw.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
public static void main(String[] args)
{
drawEnglish("draw1.txt");
}
}