BLOB的读写操作

//BLOB写入操作
package zxt.xsfw.action.ceshi;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import zxt.wai.action.ProtectedAction;
import zxt.wai.sys.Constant;
import zxt.wai.sys.RequestHelper;
import zxt.xsfw.init.WebInitLoad;

import java.io.FileInputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import oracle.sql.BLOB;
import java.sql.Statement;

public class BlobceshiAction extends ProtectedAction{

    public boolean postProcess(HttpServletRequest request, HttpServletResponse response) {
        return false;
    }

    public boolean process(HttpServletRequest request, HttpServletResponse response) {
         String name = RequestHelper.getStrParam(request, "NAME");//请求中读取参数
        String img = RequestHelper.getStrParam(request, "IMG");//请求中读取参数

        Connection conn=null;
        Statement stm=null;
        ResultSet rs=null;
        BLOB blob = null;
        FileInputStream fin=null;
        OutputStream out=null;
        try{
            conn = WebInitLoad.getSysDBTookit().createConnection();
            stm = conn.createStatement();
            conn.setAutoCommit(false);
            String sql = "insert into TEST values('1','"+name+"',EMPTY_BLOB())";
            stm.executeUpdate(sql);

            rs = stm.executeQuery("SELECT img FROM TEST WHERE id='1' FOR UPDATE ");

           fin = new FileInputStream(img);
           byte[] blobBuf = new byte[(int)fin.available()];
           fin.read(blobBuf);
           fin.close();

           if(rs.next()) {
            System.out.println(blobBuf.length);//以byte为单位
            blob = (oracle.sql.BLOB)rs.getBlob(1);
            out = blob.getBinaryOutputStream();
            out.write(blobBuf);//写入到BLOB中去
            out.close();
            conn.commit();
           }
        }catch(Exception e){
            e.printStackTrace();
        }finally{
            try {
                rs.close();
                stm.close();
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        setReturnValue("<script>alert(\"ok!BLOB保存成功！\");history.back();</script>");
        setReturnType(Constant.TARGET_TYPE_CONTENT);
        return false;
    }

}

//BLOB写入操作

package zxt.xsfw.view.ceshi;

import org.enhydra.xml.xmlc.html.HTMLObject;

import zxt.wai.sys.XmlcViewFactory;
import zxt.wai.view.ProtectedXView;
import zxt.xsfw.init.WebInitLoad;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import oracle.sql.BLOB;

public class ReadBlobceshiXView {

public boolean render() {

Connection conn=null;
Statement stm=null;
ResultSet rs=null;
try {
conn = getCon();
stm = conn.createStatement();
rs = stm.executeQuery("select img from TEST where id='1'");
if(rs.next()){
BLOB blob = (BLOB)rs.getBlob(1);
InputStream is = blob.getBinaryStream();
FileOutputStream os = new FileOutputStream("c:\\1.jpg");
int b;
byte[] buffer = new byte[1024];
while( (b=is.read(buffer)) != -1){
os.write(buffer,0,b);//把BLOB信息写到文件流中
}
is.close();
os.close();
}
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
rs.close();
stm.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return false;
}

public static void main(String[] orgs){
new ReadBlobceshiXView().render();
}

public static Connection getCon() {
Connection con = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
String url = "jdbc:oracle:thin:@localhost:1521:ora9i";
String user = "";
String password = "";
con = DriverManager.getConnection(url, user, password);
} catch (Exception e) {
e.printStackTrace();
}
return con;
}

}