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代码
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() "
").
}
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() "
").
}
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().
}