JDBC对数据库BLOB字段图片存取及页面JSP显示有关问题-数据库教程-爱易网页

JDBC对数据库BLOB字段图片存取及页面JSP显示有关问题

日期：2014-05-16　浏览次数：20562 次

JDBC对数据库BLOB字段图片存取及页面JSP显示问题
JDBC插入或更新图片保存为BLOB字段



import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class TestJDBC {

	private final static String username = "xxx";
	private final static String password = "yyyyy";
	private final static String url = "jdbc:oracle:thin:@111.222.333.444:1521:oracas";
	private final static String driver = "oracle.jdbc.driver.OracleDriver";

	private Connection conn = null;

	public Connection getConnection() {
		try {
			Class.forName(driver).newInstance();
			conn = DriverManager.getConnection(url, username, password);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return conn;
	}

	public int update() throws Exception {
		Connection conn = null;
		PreparedStatement ps = null;
		InputStream is = null;
		int cnt = 0;
		try {
			String sqlStr = "update my_table t set t.loc_img = ? where t.id = ? ";
			conn = getConnection();
			conn.setAutoCommit(false);
			ps = conn.prepareStatement(sqlStr);
			File file = new File("d:\\test3.bmp");
			is = new BufferedInputStream(new FileInputStream(file));
			ps.setBinaryStream(1, is, (int) file.length());
			ps.setString(2, "96C9F1CC15144B65E040070A3BBD46D3");
			cnt = ps.executeUpdate();
			conn.commit();
			conn.setAutoCommit(true);
			System.out.println("cnt:" + cnt);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (is != null) {
				is.close();
			}
			if (ps != null) {
				ps.close();
			}
			if (conn != null) {
				conn.close();
			}
		}
		return retVal;
	}

	public static void main(String[] args) throws Exception {
		new TestJDBC().update();
	}
}

页面JSP获取图片信息
showLocImage.jsp

<%
OutputStream os = null;
try{
	String id = request.getParameter("id");
	IScotomaBO scotomaBO = new ScotomaBO();
	java.sql.Blob image = scotomaBO.getLocImage(id);
	if(image != null){
		int length = (int) image.length();
		byte[] buf = image.getBytes(1, length);
		response.setContentType("image/jpeg");
		os = response.getOutputStream();
		for (int i = 0; i < buf.length; i++) {
			os.write(buf[i]);
		}		
	} else {
		PrintWriter pw = response.getWriter();
		pw.print("没有相关图片信息！");
	}
	out.clear(); 
	out = pageContext.pushBody(); 	
} catch (Exception e) {
	e.printStackTrace();
} finally {
	if(os!=null){
		os.flush();
		os.close();
	}
}
%>

让图片显示：
showMain.jsp

function showLocImage(id){
	//window.open('showLocImage.jsp?id='+id,'xx','height=500, width=800,
menubar=no, scrollbars=yes, resizable=yes,location=no, status=no');
	fiximgwin("showLocImage.jsp?id="+id);
}


function fiximgwin(url){ 
	var imgwin=window.open('','img','width=50,height=50,scrollbars=yes, resizable=yes'); 
	imgwin.focus();
	var HTML="<html>\r\n<head>\r\n<title>图片浏览</title>\r\n</head>\r\n<body leftmargin=\"0\" topmargin=\"0\">\r\n<img src=\""+url+"\" onload=\"window.resizeTo(this.width+10,this.height+36);window.moveTo((screen.width-this.width)/2,(screen.height-this.height+300)/2)\">\r\n</body>\r\n</html>"; 
	var doc = imgwin.document;
	doc.write(HTML); 
	doc.close();
}

如何让弹出窗口自适应图片的大小
参考
http://www2.flash8.net/teach/4140.htm

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JDBC对数据库BLOB字段图片存取及页面JSP显示有关问题

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