package com.lizhe; import Java.io.*; import java.sql.*; public class PutImg { public void putimg() { try { Class.forName("org.gjt.mm.mysql.Driver").newInstance(); String url = "JDBC:mysql://localhost/img?user=root&password=root&useUnicode=true&characterEncoding=gbk"; Connection conn = DriverManager.getConnection(url); Statement stmt = conn.createStatement(); //stmt.execute("insert into imgt (id) values (5)"); stmt.close(); PreparedStatement pstmt = null; String sql = ""; File file = new File("c:log.jpg"); InputStream photoStream = new FileInputStream(file); //sql = " UPDATE imgt SET img = ? "; sql = "INSERT INTO imgtable (img) VALUES (?)"; pstmt = conn.prepareStatement(sql); pstmt.setBinaryStream(1, photoStream, (int) file.length()); pstmt.executeUpdate(); pstmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String args[]){ PutImg pi=new PutImg(); pi.putimg(); } }
package com.lizhe; import Java.io.*; import java.sql.*; public class PutImg { public void putimg() { try { Class.forName("org.gjt.mm.mysql.Driver").newInstance(); String url = "JDBC:mysql://localhost/img?user=root&password=root&useUnicode=true&characterEncoding=gbk"; Connection conn = DriverManager.getConnection(url); Statement stmt = conn.createStatement(); //stmt.execute("insert into imgt (id) values (5)"); stmt.close(); PreparedStatement pstmt = null; String sql = ""; File file = new File("c:log.jpg"); InputStream photoStream = new FileInputStream(file); //sql = " UPDATE imgt SET img = ? "; sql = "INSERT INTO imgtable (img) VALUES (?)"; pstmt = conn.prepareStatement(sql); pstmt.setBinaryStream(1, photoStream, (int) file.length()); pstmt.executeUpdate(); pstmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } public static void main(String args[]){ PutImg pi=new PutImg(); pi.putimg(); } }
InputStream photoStream = new FileInputStream(file);
InputStream photoStream = new FileInputStream(file);
pstmt.setBinaryStream(1, photoStream, (int) file.length());
pstmt.setBinaryStream(1, photoStream, (int) file.length());
然后我们再来写一个app程序将这个文件读出来,存储成一个图片文件\
package com.lizhe; import Java.io.*; import java.sql.*; class GetImg { private static final String URL = "JDBC:MySQL://localhost/img?user=root&password =root&useUnicode=true&characterEncoding=gbk"; private Connection conn = null; private PreparedStatement pstmt = null; private ResultSet rs = null; private File file = null; public void blobRead(String outfile, int picID) throws Exception { FileOutputStream fos = null; InputStream is = null; byte[] Buffer = new byte[4096]; try { Class.forName("org.gjt.mm.mysql.Driver").newInstance(); conn = DriverManager.getConnection(URL); pstmt = conn.prepareStatement("select img from imgt where id=?"); pstmt.setInt(1, picID); // 传入要取的图片的ID rs = pstmt.executeQuery(); rs.next(); file = new File(outfile); if (!file.exists()) { file.createNewFile(); // 如果文件不存在,则创建 } fos = new FileOutputStream(file); is = rs.getBinaryStream("img"); int size = 0; while ((size = is.read(Buffer)) != -1) { // System.out.println(size); fos.write(Buffer, 0, size); } } catch (Exception e) { System.out.println( e.getMessage()); } finally { // 关闭用到的资源 fos.close(); rs.close(); pstmt.close(); conn.close(); } } public static void main(String[] args) { try { GetImg gi=new GetImg(); gi.blobRead("c:/getimgs/1.jpg", 5); } catch (Exception e) { System.out.println("[Main func error: ]" + e.getMessage()); } } }
package com.lizhe; import Java.io.*; import java.sql.*; class GetImg { private static final String URL = "JDBC:MySQL://localhost/img?user=root&password =root&useUnicode=true&characterEncoding=gbk"; private Connection conn = null; private PreparedStatement pstmt = null; private ResultSet rs = null; private File file = null; public void blobRead(String outfile, int picID) throws Exception { FileOutputStream fos = null; InputStream is = null; byte[] Buffer = new byte[4096]; try { Class.forName("org.gjt.mm.mysql.Driver").newInstance(); conn = DriverManager.getConnection(URL); pstmt = conn.prepareStatement("select img from imgt where id=?"); pstmt.setInt(1, picID); // 传入要取的图片的ID rs = pstmt.executeQuery(); rs.next(); file = new File(outfile); if (!file.exists()) { file.createNewFile(); // 如果文件不存在,则创建 } fos = new FileOutputStream(file); is = rs.getBinaryStream("img"); int size = 0; while ((size = is.read(Buffer)) != -1) { // System.out.println(size); fos.write(Buffer, 0, size); } } catch (Exception e) { System.out.println( e.getMessage()); } finally { // 关闭用到的资源 fos.close(); rs.close(); pstmt.close(); conn.close(); } } public static void main(String[] args) { try { GetImg gi=new GetImg(); gi.blobRead("c:/getimgs/1.jpg", 5); } catch (Exception e) { System.out.println("[Main func error: ]" + e.getMessage()); } } }
is = rs.getBinaryStream("img");
is = rs.getBinaryStream("img");
/* * Generated by MyEclipse Struts * Template path: templates/Java/JavaClass.vtl */ package com.lizhe.struts.action; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.Statement; import javax.Servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.upload.FormFile; import com.lizhe.struts.form.UpimgForm; /** * MyEclipse Struts * Creation date: 05-18-2007 * * XDoclet definition: * @struts.action path="/upimg" name="upimgForm" input="/userhomepage.JSP" * @struts.action-forward name="userhome" path="/userhomepage.jsp" redirect="true" contextRelative="true" */ public class UpimgAction extends Action { /* * Generated Methods */ /** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward * @throws IOException * @throws FileNotFoundException */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException, IOException { UpimgForm upimgForm = (UpimgForm) form;// TODO Auto-generated method stub FormFile file=upimgForm.getFile(); InputStream is=file.getInputStream(); try { Class.forName("org.gjt.mm.MySQL.Driver").newInstance(); String url = "JDBC:mysql://localhost/blog?user=root&password=root&useUnicode=true&characterEncoding=gb2312"; Connection conn = DriverManager.getConnection(url); Statement stmt = conn.createStatement(); //stmt.execute("insert into img (id) values (5)"); stmt.close(); PreparedStatement pstmt = null; String sql = ""; //File file = new File("c:log.jpg"); //InputStream photoStream = new FileInputStream(file); //sql = " UPDATE imgt SET img = ? "; sql = "INSERT INTO img (img) VALUES (?)"; pstmt = conn.prepareStatement(sql); pstmt.setBinaryStream(1, is, (int) file.getFileSize()); pstmt.executeUpdate(); pstmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } return mapping.findForward("userhomepage"); } }
/* * Generated by MyEclipse Struts * Template path: templates/Java/JavaClass.vtl */ package com.lizhe.struts.action; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.Statement; import javax.Servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.upload.FormFile; import com.lizhe.struts.form.UpimgForm; /** * MyEclipse Struts * Creation date: 05-18-2007 * * XDoclet definition: * @struts.action path="/upimg" name="upimgForm" input="/userhomepage.JSP" * @struts.action-forward name="userhome" path="/userhomepage.jsp" redirect="true" contextRelative="true" */ public class UpimgAction extends Action { /* * Generated Methods */ /** * Method execute * @param mapping * @param form * @param request * @param response * @return ActionForward * @throws IOException * @throws FileNotFoundException */ public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws FileNotFoundException, IOException { UpimgForm upimgForm = (UpimgForm) form;// TODO Auto-generated method stub FormFile file=upimgForm.getFile(); InputStream is=file.getInputStream(); try { Class.forName("org.gjt.mm.MySQL.Driver").newInstance(); String url = "JDBC:mysql://localhost/blog?user=root&password=root&useUnicode=true&characterEncoding=gb2312"; Connection conn = DriverManager.getConnection(url); Statement stmt = conn.createStatement(); //stmt.execute("insert into img (id) values (5)"); stmt.close(); PreparedStatement pstmt = null; String sql = ""; //File file = new File("c:log.jpg"); //InputStream photoStream = new FileInputStream(file); //sql = " UPDATE imgt SET img = ? "; sql = "INSERT INTO img (img) VALUES (?)"; pstmt = conn.prepareStatement(sql); pstmt.setBinaryStream(1, is, (int) file.getFileSize()); pstmt.executeUpdate(); pstmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } return mapping.findForward("userhomepage"); } }
< %@ page contentType="text/html;charset=gb2312"%> < %@ page import="java.sql.*" %> < %@ page import="java.util.*"%> < %@ page import="java.text.*"%> < %@ page import="java.io.*"%> < %@ page import="java.awt.*"%> < html> < body> < % Class.forName("org.gjt.mm.mysql.Driver").newInstance(); String url="jdbc:mysql://localhost/img?user=root&password=root"; Connection con = DriverManager.getConnection(url); String sql = "select * from imgt where id=5"; Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(sql); if(rs.next()) { InputStream in = rs.getBinaryStream("img"); ServletOutputStream op = response.getOutputStream(); int len; byte[] buf=new byte[1024]; while((len= in.read(buf))!=-1) { op.write(buf, 0, len); } op.close(); in.close(); } rs.close(); stmt.close(); con.close(); %> < /body> < /html>