1 見以下代碼實現向MySQL中儲存圖片文件：
1private final String insertquery = "insert into employeephoto (Employee_ID,Binary_Photo,LastMod,Created) values (?,?, NOW(), NOW())";
2
3
4
5public void doInsertStaffPic(String loginname,String source_URL) {
6
7
8
9 Connection conn = null;
10
11 PreparedStatement pre = null;
12
13
14
15 try {
16
17 // 進行數據庫連接，這裡我使用的是在STRUTS中配置的連接池，當然也可// 以自己通過JDBC直接連
18
19 conn = DBProcess.getConnection();
20
21
22
23//從圖片源中獲得圖片對象並寫到緩存中
24
25 Image image = new ImageIcon(source_URL).getImage();
26
27 BufferedImage bImage = new BufferedImage(image.getWidth(null),
28
29 image.getHeight(null), BufferedImage.TYPE_INT_RGB);
30
31 Graphics bg = bImage.getGraphics();
32
33 bg.drawImage(image, 0, 0, null);
34
35 bg.dispose();
36
37
38
39//將圖片寫入2進制的輸出流 並放如到byte[] buf中
40
41 ByteArrayOutputStream out = new ByteArrayOutputStream();
42
43 ImageIO.write(bImage, "jpg", out);
44
45 byte[] buf = out.toByteArray();
46
47
48
49 //獲得這個輸出流並將他設置到BLOB中
50
51 ByteArrayInputStream inStream = new ByteArrayInputStream(buf);
52
53 pre = conn.prepareStatement(insertstaffpicquery);
54
55 pre.setString(1, loginname);
56
57 pre.setBinaryStream(2, inStream, inStream.available());
58
59 // 執行寫如數據
60
61pre.executeUpdate();
62
63
64
65
66
67 } catch (Exception exc) {
68
69 exc.printStackTrace();
70
71 }
72
73
74
75 finally {
76
77 try {
78
79 pre.close();
80
81 conn.close();
82
83
84
85 } catch (SQLException e) {
86
87 e.printStackTrace();
88
89 }
90
91 }
92
93
94
95 }
96
97
2 下代碼實現從MySQL中獲取圖片文件並寫入本地文件系統：
1private final String writeoutquery = "insert into employeephoto (Employee_ID,Binary_Photo,LastMod,Created) values (?,?, NOW(), NOW())";
2
3
4
5// retrive the picture data from database and write it to the local disk
6
7 public void doGetAndShowStaffPic(String loginname, String dir) {
8
9
10
11 FileOutputStream output = null;
12
13 InputStream input = null;
14
15
16
17 Connection conn = null;
18
19 ResultSet rs = null;
20
21 PreparedStatement pre = null;
22
23
24
25 try {
26
27 conn = DBProcess.getConnection();
28
29 pre = conn.prepareStatement(writeoutquery);
30
31 pre.setString(1, loginname);
32
33 rs = pre.executeQuery();
34
35
36
37 if (rs.next()) {
38
39 // 從數據庫獲得2進制文件數據
40
41 Blob image = rs.getBlob("Binary_Photo");
42
43 // setup the streams
44
45 Input = image.getBinaryStream();
46
47
48 try {
49
50 // 設置寫出路徑。
51
52 output = new FileOutputStream(dir);
53
54 } catch (FileNotFoundException e1) {
55
56
57
58 e1.printStackTrace();
59
60 }
61
62 // set read buffer size 注意不要設置的太小，要是太小，圖片可能不完整
63
64 byte[] rb = new byte[1024000];
65
66 int ch = 0;
67
68 // process blob
69
70
71
72 try {
73
74 // 寫入本地文件系統
75
76 while ((ch = input.read(rb)) != -1) {
77
78 output.write(rb, 0, ch);
79
80
81
82 }
83
84
85
86 } catch (IOException e) {
87
88
89
90 e.printStackTrace();
91
92 }
93
94
95
96 try {
97
98 input.close();
99
100 } catch (IOException e) {
101
102
103
104 e.printStackTrace();
105
106 }
107
108 try {
109
110 output.close();
111
112 } catch (IOException e) {
113
114
115
116 e.printStackTrace();
117
118 }
119
120
121
122 }
123
124
125
126 } catch (SQLException e) {
127
128 e.printStackTrace();
129
130 }
131
132
133
134 finally {
135
136 try {
137
138 rs.close();
139
140 pre.close();
141
142 conn.close();
143
144
145
146 } catch (SQLException e) {
147
148 e.printStackTrace();
149
150 }
151
152 }
153
154 }
