How to add pictures to mysql: First create a method to read pictures using FileInputStream; then connect to the database and write sql statements, and use PreparedStatement to execute sql statements.
The operating environment of this tutorial: Windows 7 system, mysql version 8.0.22. This method is suitable for all brands of computers.
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How to add pictures to mysql:
1. Effect
Isn’t it saving a string? You can look at the data type on the left.
2. Get blob data
We create a method to read the image using FileInputStream, and ByteArrayOutputStream will read Write the fetched data into the byte[] array, and then
public static byte[] getImgStr(String path) throws IOException {
FileInputStream fis = new FileInputStream(path);
ByteArrayOutputStream out = new ByteArrayOutputStream();
int len = 0;
byte[] b = new byte[1024];
while ((len = fis.read(b))!= -1){
out.write(b,0,len);
}
//接收out
byte[] array = out.toByteArray();
fis.close();
out.close();
return array;
}3. Connect to the database and write the sql statement
Use Blob to create a Blob, and then add the data we obtained Convert the image data to blob type, and then use PreparedStatement to execute the sql statement, because it supports placeholders and has a setBlob method that can directly write the value in our blob address to the database. And then you're done.
public static void main(String[] args) {
/*
加载驱动
*/
try {
Class.forName("com.mysql.cj.jdbc.Driver");
//获取连接
String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC";
String user= "root";
String password ="123456";
try {
Connection connection = DriverManager.getConnection(url,user,password);
/*
插入图片
*/
byte[] arr = getImgStr("图片地址");
Blob blob = connection.createBlob();
blob.setBytes(1,arr);
String sql = "insert into pictures (name,pic,date) values('张三',?,'2015-01-01')";
PreparedStatement ps = connection.prepareStatement(sql);
ps.setBlob(1,blob);
ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
} catch (ClassNotFoundException | IOException e) {
e.printStackTrace();
}
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