java - 如何将 UCanAccess 连接到使用数据库密码加密的 Access 数据库？

Question

我开发了一个带有 Access 数据库的 Java 应用程序(字典)来存储字典中的单词，我正准备分发它。我想用密码加密我的数据库，以防止人们 Access 我的话。当我设置密码时，Java 代码显示此异常

net.ucanaccess.jdbc.UcanaccessSQLException: Decoding not supported.  Please choose a CodecProvider which supports reading the current database encoding.
at net.ucanaccess.jdbc.UcanaccessDriver.connect(UcanaccessDriver.java:247)

这是使用密码加密我的数据库之前的连接代码....

String s1="jdbc:ucanaccess://";
String user="";
String pass="";
String s4="words.accdb";

public void connectToDB(){
        //database connection
        try {
            conn = DriverManager.getConnection(s1+s4,user,pass);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //end of database connection
    }

这里是密码加密后的代码例如12345...

String s1="jdbc:ucanaccess://";
String user="";
String pass="12345";
String s4="words.accdb";

public void connectToDB(){
        //database connection
        try {
            conn = DriverManager.getConnection(s1+s4,user,pass);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        //end of database connection
    }

Answer 1

如何将UCanAccess连接到使用数据库密码加密的Access数据库的步骤

第 1 步:
将这两个包添加到您的项目中(jackcess-encrypt.jar、bcprov-ext-jdk15on-152)

您可以从以下链接下载这两个包:

Jackcess Encrypt
Bouncy Castle

第 2 步:
您必须将此类添加到您的项目文件夹中

import java.io.File;
import java.io.IOException;
import net.ucanaccess.jdbc.JackcessOpenerInterface;
import com.healthmarketscience.jackcess.CryptCodecProvider;
import com.healthmarketscience.jackcess.Database;
import com.healthmarketscience.jackcess.DatabaseBuilder;

public class CryptCodecOpener implements JackcessOpenerInterface {
         @Override
    public Database open(File fl,String pwd) throws IOException {
       DatabaseBuilder dbd =new DatabaseBuilder(fl);
       dbd.setAutoSync(false);
       dbd.setCodecProvider(new CryptCodecProvider(pwd));
       dbd.setReadOnly(false);
       return dbd.open();
    }
  //Notice that the parameter setting autosync =true is recommended with UCanAccess for performance reasons. 
  //UCanAccess flushes the updates to disk at transaction end. 
  //For more details about autosync parameter (and related tradeoff), see the Jackcess documentation. 
}

像这样

第三步:
使用下面的连接代码

public void connectToDB(){
            try {
                conn = DriverManager.getConnection("jdbc:ucanaccess://words.accdb;jackcessOpener=CryptCodecOpener", "user", "pass");
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
    }

您还可以观看此视频... https://www.youtube.com/watch?v=TT6MgBBkRSE