用 java来截取中文英文字符串,过多的用省略号显示

用 java来截取中文英文字符串,过多的用省略号显示

 

需求:任意一个字符串 比如"abc我爱中国" 大于12个字节的 要截取掉,用 ... 来结尾, 最终结果不能大于12个字节  注 中文占2个字节

 

public static String subStringCN(final String str, final int maxLength) {
		if (str == null) {
			return str;
		}
		String suffix = "...";
		int suffixLen = suffix.length();
		
		final StringBuffer sbuffer = new StringBuffer();
		final char[] chr = str.trim().toCharArray();
		int len = 0;
		for (int i = 0; i < chr.length; i++) {
			
			if (chr[i] >= 0xa1) {
				len += 2;
			} else {
				len++;
			}
		}
		
		if(len<=maxLength){
			return str;
		}
		
		len = 0;
		for (int i = 0; i < chr.length; i++) {
 
			if (chr[i] >= 0xa1) {
				len += 2;
				if (len + suffixLen > maxLength) {
					break;
				}else {
					sbuffer.append(chr[i]);
				}
			} else {
				len++;
				if (len + suffixLen > maxLength) {
					break;
				}else {
					sbuffer.append(chr[i]);
				}
			}
		}
		sbuffer.append(suffix);
		return sbuffer.toString();
	}
 
	public static void main(String[] args) {
 
		String st2 = "是个好人啊,是个好人啊";
		System.out.println(subStringCN(st2, 12));
 
		String st3 = "是个好人啊 persen";
		System.out.println(subStringCN(st3, 12));
 
		String st4 = " persen是个好人啊";
		System.out.println(subStringCN(st4, 12));
		
		String st1 = "个好人啊";
		System.out.println(subStringCN(st1, 12));
 
		String st0 = "sdddddddddddddddddddd";
		System.out.println(subStringCN(st0, 12));
	}

 输出如下：

是个好人...
是个好人...
persen是...
个好人啊
sdddddddd...

 

本文转自：http://lishiguang.iteye.com/blog/1336057