今天图老师小编给大家精心推荐个从数据库读出的JPG文件的字符流转换成图片显示在页面上的相关教程,一起来看看过程究竟如何进行吧!喜欢还请点个赞哦~
【 tulaoshi.com - Web开发 】
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
ServletOutputStream out = res.getOutputStream();
Statement dispStmt = null, setStmt = null;
try {
dispStmt = Con.createStatement();
setStmt = Con.createStatement();
setStmt.executeUpdate("set textsize 2048000");
} catch (Exception e) {
out.println("Create Statement error:" + e.toString() + "br");
}
String ls_sql = null;
ls_sql = req.getParameter("ImageSQL");
if (ls_sql == null)
ls_sql = "";
ls_sql = ls_sql.trim();
if (!ls_sql.equals("")) {
ResultSet rs = null;
try {
rs = dispStmt.executeQuery(ls_sql);
} catch (Exception e) {
System.out.println(
"Unable to Exec Statment" + e.toString() + "br");
}
try {
while (rs.next()) {
try {
res.setContentType("image/jpeg");
InputStream is = rs.getBinaryStream(1);
int size = is.available();
byte[] bzp = new byte[size];
is.read(bzp);
out.write(bzp);
} catch (Exception e) {
System.out.println("Wirte image error: " + e.toString());
}
}
rs.close();
} catch (Exception e) {
System.out.println("Unable to Close Statment" + e.toString());
}
}
try {
dispStmt.close();
} catch (Exception e) {
System.out.println("Close Statement Error: " + e.toString());
}
out.close();
}
--------------------------------------------------------------------------------
再附一个:
从库中读图片显示到页面上的主要源码
%@ page contentType="text/html;charset=iso8859_1"%
%@ page import="java.sql.ResultSet"%
jsp:useBean id="query" class="pub.MakeDB"/
%
String sql = "select * from images";
ResultSet rs = query.executeQuery(sql);
rs.next();
InputStream in = rs.getBinaryStream("image");
ServletOutputStream sos = response.getOutputStream();
int len = 0;
byte[] b = new byte[1024];
response.reset();
response.setContentType("image/gif");
while((len = in.read(b)) 0)
sos.write(b,0,len);
in.close();
sos.close();
query.cls();
%
如果是写到文件只要把sos
定义为DataOutputStream sos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("/a.gif")));
来源:http://www.tulaoshi.com/n/20160219/1621084.html
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