[英]How to retrieve an zip file from oracle blob using java?
我有一個 zip 文件存儲在 Oracle 數據庫表中,該表由三個不同的 xml 文件組成。 我想要做的是在我的本地文件系統中獲取這個 zip 文件。 為了檢索這個 zip 文件,我在下面編寫了 java 代碼:
package com.pack.IOT;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Test2 {
public static Connection con;
public static PreparedStatement stmt;
public static void main(String[] args) {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url,uname,pwd);
stmt=con.prepareStatement("select * from FileStore");
ResultSet rs=stmt.executeQuery();
while (rs.next()) {
InputStream is = rs.getBinaryStream(3);
convert(is);
}
} catch (Exception e) {
e.printStackTrace();
}
finally {
try {
stmt.close();
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
private static void convert(InputStream is) {
FileOutputStream outputStream = null;
File file = new File("C:\\Users\\nshaik\\Desktop\\IOTZip.zip");
try {
outputStream = new FileOutputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result;
result = bis.read();
while (result != -1) {
buf.write((byte) result);
result = bis.read();
}
outputStream.write(buf.toByteArray());
System.out.println("File write success....");
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
outputStream.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
}
代碼運行正常,但我看到錯誤“存檔意外結束”,這個 zip 文件應該包含三個不同的文件,但我只看到一個文件,它的大小為零。
我不確定我做錯了什么,非常感謝任何人的幫助。
以下是上述要求的工作代碼,
package com.pack.IOT;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Test2 {
public static Connection con;
public static PreparedStatement stmt;
public static void main(String[] args) {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url,uname,pwd);
stmt=con.prepareStatement("select * from FileStore");
ResultSet rs=stmt.executeQuery();
while (rs.next()) {
InputStream is = rs.getBinaryStream(3);
convert(is);
}
} catch (Exception e) {
e.printStackTrace();
}
finally {
try {
stmt.close();
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
private static void convert(InputStream is) {
FileOutputStream outputStream = null;
File file = new File("C:\\Users\\nshaik\\Desktop\\IOTZip.zip");
try {
outputStream = new FileOutputStream(file);
BufferedInputStream bis = new BufferedInputStream(is);
ByteArrayOutputStream buf = new ByteArrayOutputStream();
int result;
result = bis.read();
while (result != -1) {
buf.write((byte) result);
result = bis.read();
}
outputStream.write(buf.toByteArray());
System.out.println("File write success....");
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
outputStream.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
}
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