常用类型转换方法工具类

来源：互联网发布：纳什职业生涯总数据编辑：程序博客网时间：2024/05/13 04:20
功能：十六进制字符串与字节数组互转、字符转字节、Blob类型转字节数组、阿拉伯数字转中文小写
  1 import java.io.BufferedInputStream;  2 import java.io.IOException;  3 import java.sql.Blob;  4   5 /**  6  * 常用类型转换方法工具类  7  */  8 public class ConvertUtil {  9      10    /** 11     *  字节数组转换为十六进制字符串. 12     *  @param src  13     *  @return 十六进制字符串 14     */    15    public static String bytesToHexString(byte[] src){ 16        StringBuilder stringBuilder = new StringBuilder(""); 17        if (src == null || src.length <= 0) { 18            return null; 19        } 20        for (int i = 0; i < src.length; i++) { 21            int v = src[i] & 0xFF; 22            String hv = Integer.toHexString(v); 23            if (hv.length() < 2) { 24                stringBuilder.append(0); 25            } 26            stringBuilder.append(hv); 27        } 28        return stringBuilder.toString(); 29    } 30     31    /** 32     *  十六进制字符串转换为字节数组 33     *  @param hexString 十六进制字符串 34     *  @return  35     */ 36    public static byte[] hexStringToBytes(String hexString) { 37        if (hexString == null || hexString.equals("")) { 38            return null; 39        } 40        hexString = hexString.toUpperCase(); 41        int length = hexString.length() / 2; 42        char[] hexChars = hexString.toCharArray(); 43        byte[] d = new byte[length]; 44        for (int i = 0; i < length; i++) { 45            int pos = i * 2; 46            d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); 47        } 48        return d; 49    } 50     51    /** 52     * 字符转换为字节 53     * @param c 字符 54     * @return 55     */ 56    private static byte charToByte(char c) { 57        return (byte) "0123456789ABCDEF".indexOf(c); 58    } 59     60    /** 61     * Blob类型转换为字节数组 62     * @param blob 63     * @return 64     */ 65     public static byte[] blobToBytes(Blob blob) { 66         BufferedInputStream is = null; 67         try { 68             is = new BufferedInputStream(blob.getBinaryStream()); 69             byte[] bytes = new byte[(int) blob.length()]; 70             int len = bytes.length; 71             int offset = 0; 72             int read = 0; 73      74             while (offset < len && (read = is.read(bytes, offset, len - offset)) >= 0) { 75                 offset += read; 76             } 77             return bytes; 78         } catch (Exception e) { 79             return null; 80         } finally { 81             try { 82                 is.close(); 83                 is = null; 84             } catch (IOException e) { 85                 return null; 86             } 87         } 88     } 89      90     /** 91      * 阿拉伯数字转中文小写 92      * @param si 阿拉伯数字 93      * @return 中文小写字符串 94      */ 95     public static String transition(String si){   96         String []aa={"","十","百","千","万","十万","百万","千万","亿","十亿"};   97         String []bb={"一","二","三","四","五","六","七","八","九"};   98         char[] ch=si.toCharArray();   99         int maxindex=ch.length;100         // 字符的转换101         String result = "";102         // 两位数的特殊转换  103         if(maxindex==2){   104             for(int i=maxindex-1,j=0;i>=0;i--,j++){    105                 if(ch[j]!=48){     106                     if(j==0&&ch[j]==49){      107                         result += aa[i];     108                     }else{      109                         result += bb[ch[j]-49]+aa[i];     110                     }    111                 }   112             }113         // 其他位数的特殊转换，使用的是int类型最大的位数为十亿  114         }else{   115             for(int i=maxindex-1,j=0;i>=0;i--,j++){    116                 if(ch[j]!=48){     117                     result += bb[ch[j]-49]+aa[i];    118                 }   119             }  120         }121         122         return result;123     } 124 }
文章转载自：http://www.cnblogs.com/Mr-kevin/p/5560490.html
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