How to prevent sql injection in jdbc?

JDBC-防止sql注入漏洞 

使用预编译可有效防止sql的注入漏洞。

原因：在statement中不能够有效的防止sql的注入漏洞,在于用户传入参数的时候可能会传入一些特殊字符,比如单引号' ' ,或者是-- 这种会影响到我们的sql语句.

所以使用预编译中的占位符,也就是?,可以有效的处理这一问题.

public class Prepared {
@Test
public void papa(){
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try{
//注册驱动
// Class.forName("com.mysql.jdbc.Driver");
//建立连接
// conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/user","root","dumy");
conn =JDBCUtils.getConnection();
//编写sql代码
//String sql = "select * from administer where id = ?";
String sql = "select * from administer where username = ? and password =?";
//预编译
pstmt = conn.prepareStatement(sql);
//给？ 赋值
pstmt.setString(1, "ddd");
pstmt.setString(2, "123");
rs= pstmt.executeQuery();
while(rs.next()){
System.out.println("登录成功");
}
}catch(Exception e){
e.printStackTrace();
}finally{
JDBCUtils.release(pstmt, conn, rs);
}
}
}

The above is the detailed content of How to prevent sql injection in jdbc?. For more information, please follow other related articles on the PHP Chinese website!