1 package FileDemo; 2 3 import java.io.IOException; 4 5 public class CutStringTest { 6 7 /** 8 * @param args 9 * @throws IOException 10 */ 11 public static void main(String[] args) throws IOException { 12 13 String str = "ab你好cd谢谢"; 14 /*byte buf[]=str.getBytes("GBK"); 15 for(byte ch:buf){ 16 System.out.println(Integer.toBinaryString(ch)); 17 }*/ 18 int len = str.getBytes("gbk").length; 19 for (int x = 0; x < len; x++) { 20 System.out.println("截取" + (x + 1) + "字节结果时：" 21 + cutStringByByte(str, x + 1)); 22 } 23 String str1 = "ab你好cd杮"; 24 int len1 = str.getBytes("gbk").length; 25 for (int x = 0; x < len1; x++) { 26 System.out.println("截取" + (x + 1) + "字节结果时：" 27 + cutStringByU8(str1, x + 1)); 28 } 29 } 30 31 // 使用UTF-8编码表进行截取字符串，一个汉字对应三个负数，一个英文字符对应一个正数 32 private static String cutStringByU8(String str, int len) throws IOException { 33 34 byte[] buf = str.getBytes("utf-8"); 35 int count = 0; 36 for (int x = len - 1; x >= 0; x--) { 37 if (buf[x] < 0) { 38 count++; 39 } else { 40 break; 41 } 42 } 43 if (count % 3 == 0) { 44 return new String(buf, 0, len, "utf-8"); 45 } else if (count % 3 == 1) { 46 return new String(buf, 0, len - 1, "utf-8"); 47 } else { 48 return new String(buf, 0, len - 2, "utf-8"); 49 } 50 } 51 52 // 使用GBK编码表进行字符串的截取，一个英文字符对应码表一个正数，一个汉字对应两个负数 53 public static String cutStringByByte(String str, int len) 54 throws IOException { 55 byte[] buf = str.getBytes("gbk"); 56 int count = 0; 57 for (int x = len - 1; x >= 0; x--) { 58 if (buf[x] < 0) { 59 count++; 60 } else { 61 break; 62 } 63 } 64 if (count % 2 == 0) { 65 return new String(buf, 0, len, "gbk"); 66 } else { 67 return new String(buf, 0, len - 1, "gbk"); 68 } 69 } 70 71 }