在图片上写字的问题！

Question

服务器上的一张图片  在这个图片上写上XX 字后  从新生成一张图片！  大家有没有这样的代码？谢谢

Answer 1

用servlet生成验证码的例子，给楼主参考一下import java.io.IOException;import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;public class ChkImgGenerate extends HttpServlet {    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        ServletOutputStream out = response.getOutputStream();
        String imgid = request.getParameter("imgid");
        response.setContentType("image/jpeg");
        out.write(getImgs(imgid));
        out.flush();
    }
    
    private byte[] getImgs(String imgid){
        String query = "select img from chk_img where id='"+imgid+"'";
        Blob blob = null;
        byte[] bytes = null;
        //String description = "";
        
        /*Random rnd = new Random();
        for(int i=0; i<ids.length; i++){
            int tmp = rnd.nextInt(total);
            ids[i] = "0123456789".substring(tmp,tmp+1);
        }*/
        
        try{
            /*Context initCtx = new InitialContext();
            DataSource db = (DataSource) initCtx
                    .lookup("java:comp/env/jdbc/mysql");
            Connection conn = db.getConnection();*/
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test",
                    "root",
                    "");
            Statement stmt = conn.createStatement();            
            ResultSet rs = stmt.executeQuery(query);
            //ResultSetMetaData md = rs.getMetaData();
            while(rs.next()){
                blob = rs.getBlob(1);
            }
            bytes = blob.getBytes(1,(int)(blob.length()));
            conn.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        return bytes;
    }}