[英]Display Blob from database with java
我想顯示/打印數據庫中的Blob圖像。 使用以下代碼,它僅顯示以下內容:
Pic: com.mysql.jdbc.Blob@1e1a68bc
Name:Test
Phone:1234
名稱和電話的正確數據有效,但斑點不顯示圖像。 我究竟做錯了什么? 有什么幫助嗎?
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/Test", "root", "");
stmt = conn.createStatement();
String query = "SELECT * FROM Person WHERE email ='"+emailLogin+"'";
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
String name = rs.getString("name");
String telephone = rs.getString("telephone");
Blob pic = rs.getBlob("foto");
out.print("Picture: "+pic + "<br>");
out.print("Name: "+name + "<br>");
out.print("Phone: "+telephone + "<br>");
}
} catch (SQLException e) {
out.println("An error occured while retrieving " + "all results: "
+ e.toString());
} catch (ClassNotFoundException e) {
throw (new ServletException(e.toString()));
} finally {
try {
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
} catch (SQLException ex) {
}
}
您不能將Blob對象打印到標准輸出。 在這里,我的代碼顯示了如何從中創建流並將其保存到文件。 您可以使用InputStream(is)執行任何操作。
File image = new File("/user/eranda/temp/MyImage.png");
FileOutputStream fos = new FileOutputStream(image);
byte[] buffer = new byte[1];
InputStream is = resultSet.getBinaryStream("foto");
while (is.read(buffer) > 0) {
fos.write(buffer);
}
fos.close();
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