用java从mysql数据库中读取docx文件
我有一个将docx文件存储到MYSQL数据库MEDIUMBLOB数据类型的程序 如何从数据库中检索该文件,然后使用ApachePOI读取该文件以检查字数、段落数等?(初始问题) 这是我保存文件的代码用java从mysql数据库中读取docx文件,java,apache,file,docx,Java,Apache,File,Docx,我有一个将docx文件存储到MYSQL数据库MEDIUMBLOB数据类型的程序 如何从数据库中检索该文件,然后使用ApachePOI读取该文件以检查字数、段落数等?(初始问题) 这是我保存文件的代码 public void saveFile(String FileDirectory, String FileName) { try { //Connecting to MYSQL Database Class.forName(driver).newInstan
public void saveFile(String FileDirectory, String FileName)
{
try {
//Connecting to MYSQL Database
Class.forName(driver).newInstance();
con = DriverManager.getConnection(url+dbName,userName,password);
//saving the image
PreparedStatement psmnt = (PreparedStatement) con.prepareStatement("INSERT INTO doccompfiles VALUES(?,?,?)");
psmnt.setInt(1, 5);
psmnt.setNString(2, FileName);
File f = new File(FileDirectory + FileName);
psmnt.setBlob(3, new FileInputStream(f), f.length());
psmnt.executeUpdate();
con.close();
}
catch (Exception e) {
JOptionPane.showMessageDialog(null, "Error saving file");
e.printStackTrace();
}
}
研究并找到了一种方法,但我的stacktrace出现了错误。以下是用于检索的代码
public void loadFile(String FileName)
{
try
{
//Connecting to MYSQL Database
Class.forName(driver).newInstance();
con = DriverManager.getConnection(url+dbName,userName,password);
Statement stmt = (Statement) con.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM doccompfiles WHERE FileName = '"+ FileName +"'");
InputStream is = rs.getBinaryStream("File");
HWPFDocument doc = new HWPFDocument(is);
WordExtractor we = new WordExtractor(doc);
String[] paragraphs = we.getParagraphText();
JOptionPane.showMessageDialog(null, "Number of Paragraphs" + paragraphs.length);
con.close();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
堆栈跟踪:
java.sql.SQLException: Before start of result set
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
at com.mysql.jdbc.ResultSetImpl.checkRowPos(ResultSetImpl.java:854)
at com.mysql.jdbc.ResultSetImpl.getBinaryStream(ResultSetImpl.java:1553)
at com.mysql.jdbc.ResultSetImpl.getBinaryStream(ResultSetImpl.java:1586)
at documentComparisor.Database.loadFile(Database.java:150)
at documentComparisor.Home$5.actionPerformed(Home.java:195)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
我可以验证该文件是否存储在数据库中,以及select语句中我的表详细信息是否正确。有什么想法吗
谢谢
HWPFDocument doc = new HWPFDocument(binaryStream);
WordExtractor we = new WordExtractor(doc);
String[] paragraphs = we.getParagraphText();
System.out.println("Total Paragraphs: "+paragraphs.length);
(then iterate through paragraphs array and count words)
HWPFDocument doc = new HWPFDocument(binaryStream);
WordExtractor we = new WordExtractor(doc);
String[] paragraphs = we.getParagraphText();
System.out.println("Total Paragraphs: "+paragraphs.length);
(then iterate through paragraphs array and count words)
请检查下面的代码,以从数据库读取和写入blob数据
公共类ReadBlobData{
公共静态void main(字符串[]args){
writeBlob(65,“Test.docx”);
readBlob(65,“Test.docx”);
}
公共静态void readBlob(int-candidateId,字符串文件名){
String selectSQL=“从scope1.documents中选择文档\文本,其中id=?”;
结果集rs=null;
try(Connection conn=mysqljdbcuti.getConnection();
PreparedStatement pstmt=conn.prepareStatement(selectSQL);){
//设置参数;
pstmt.setInt(1,候选ID);
rs=pstmt.executeQuery();
//将二进制流写入文件
文件=新文件(文件名);
FileOutputStream输出=新的FileOutputStream(文件);
System.out.println(“写入文件”+file.getAbsolutePath());
while(rs.next()){
InputStream输入=rs.getBinaryStream(“文档文本”);
byte[]buffer=新字节[(int)file.length()];
while(输入读取(缓冲区)>0){
输出。写入(缓冲区);
}
}
}catch(SQLException | IOException e){
System.out.println(e.getMessage());
}最后{
试一试{
如果(rs!=null){
rs.close();
}
}捕获(SQLE异常){
System.out.println(e.getMessage());
}
}
}
公共静态void writeBlob(int-candidateId,字符串文件名){
//更新sql
字符串updateSQL=“更新范围1.documents”+
“设置文档_text=?其中id=?”;
try(Connection conn=mysqljdbcuti.getConnection();
PreparedStatement pstmt=conn.prepareStatement(updateSQL)){
//读文件
File File=新文件(“/home/hardik/Desktop/Test.docx”);
FileInputStream输入=新的FileInputStream(文件);
System.out.println(file.length());
//设置参数
pstmt.setBinaryStream(1,输入);
pstmt.setInt(2,候选ID);
//将简历文件存储在数据库中
System.out.println(“读取文件”+file.getAbsolutePath());
pstmt.executeUpdate();
System.out.println(“将文件存储在数据库中”);
}catch(SQLException | FileNotFoundException e){
System.out.println(e.getMessage());
}
}
}
公共类mysqljdbcuti{
公共静态连接getConnection()引发SQLException{
连接conn=null;
//分配数据库参数
String url=“jdbc:mysql://localhost:3306/scope1" ;
字符串user=“root”;
字符串password=“root”;
//创建到数据库的连接
conn=DriverManager.getConnection(url、用户、密码);
返回连接;
}
}
请检查下面的代码,查看数据库中的读写blob数据
公共类ReadBlobData{
公共静态void main(字符串[]args){
writeBlob(65,“Test.docx”);
readBlob(65,“Test.docx”);
}
公共静态void readBlob(int-candidateId,字符串文件名){
String selectSQL=“从scope1.documents中选择文档\文本,其中id=?”;
结果集rs=null;
try(Connection conn=mysqljdbcuti.getConnection();
PreparedStatement pstmt=conn.prepareStatement(selectSQL);){
//设置参数;
pstmt.setInt(1,候选ID);
rs=pstmt.executeQuery();
//将二进制流写入文件
文件=新文件(文件名);
FileOutputStream输出=新的FileOutputStream(文件);
System.out.println(“写入文件”+file.getAbsolutePath());
while(rs.next()){
InputStream输入=rs.getBinaryStream(“文档文本”);
byte[]buffer=新字节[(int)file.length()];
while(输入读取(缓冲区)>0){
输出。写入(缓冲区);
}
}
}catch(SQLException | IOException e){
System.out.println(e.getMessage());
}最后{
试一试{
如果(rs!=null){
rs.close();
}
}捕获(SQLE异常){
System.out.println(e.getMessage());
}
}
}
公共静态void writeBlob(int-candidateId,字符串文件名){
//更新sql
字符串updateSQL=“更新范围1.documents”+
“设置文档_text=?其中id=?”;
try(Connection conn=mysqljdbcuti.getConnection();
PreparedStatement pstmt=conn.prepareStatement(updateSQL)){
//读文件
File File=新文件(“/home/hardik/Desktop/Test.docx”);
FileInputStream输入=新的FileInputStream(文件);
System.out.println(file.length());