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?

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();}