常用類型轉換方法工具類，類型轉換工具類
功能：十六進制字符串與字節數組互轉、字符轉字節、Blob類型轉字節數組、阿拉伯數字轉中文小寫
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1 import java.io.BufferedInputStream;
2 import java.io.IOException;
3 import java.sql.Blob;
4
5 /**
6 * 常用類型轉換方法工具類
7 */
8 public class ConvertUtil {
9
10 /**
11 * 字節數組轉換為十六進制字符串.
12 * @param src
13 * @return 十六進制字符串
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 * 十六進制字符串轉換為字節數組
33 * @param hexString 十六進制字符串
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 * 字符轉換為字節
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類型轉換為字節數組
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 * 阿拉伯數字轉中文小寫
92 * @param si 阿拉伯數字
93 * @return 中文小寫字符串
94 */
95 public static String transition(String si){
96 String []aa={"","十","百","千","萬","十萬","百萬","千萬","億","十億"};
97 String []bb={"一","二","三","四","五","六","七","八","九"};
98 char[] ch=si.toCharArray();
99 int maxindex=ch.length;
100 // 字符的轉換
101 String result = "";
102 // 兩位數的特殊轉換
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 // 其他位數的特殊轉換，使用的是int類型最大的位數為十億
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 }
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