imageservlet.java

采用JAVA开发

package com.gctech.sms.voice.common;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.Calendar;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageDecoder;
import com.sun.image.codec.jpeg.JPEGImageEncoder;


public class ImageServlet
    extends HttpServlet
{
  private static final String CONTENT_TYPE = "text/html; charset=GBK";

  //Initialize global variables
  public void init()
      throws ServletException
  {
  }

  //Process the HTTP Get request
  public void doGet(HttpServletRequest request,HttpServletResponse response)
      throws ServletException,IOException
  {
    HttpSession currentSession = request.getSession(false);
    if(currentSession == null)
      currentSession = request.getSession(true);
    String CONTENT_TYPE = "image/jpeg;charset=GB2312";
    response.setContentType(CONTENT_TYPE);

    String text = ""; //要嵌的文字
    String imageFile = ""; //被嵌的图片的虚拟路径
    int x = 0; //坐标
    int y = 0;
    String fontColor = ""; //字体颜色
    int fontSize = 0; //字体大小
    String fontStyle = ""; //字体风格(斜体,粗体等)
    String fontName = ""; //字体名称

    try
    {
      int rand = (int)(Math.random() * 100000);
      if(rand < 10)
        text = "00000" + rand;
      else if(rand < 100)
        text = "0000" + rand;
      else if(rand < 1000)
        text = "000" + rand;
      else if(rand < 10000)
        text = "00" + rand;
      else
        text = "" + rand;
      imageFile = request.getParameter("templete");

      x = 2;
      y = 15;
      fontColor = "0000FF";
      fontSize = 14;
      fontStyle = "plain";
      fontName = "arial";
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }

    ServletOutputStream output = response.getOutputStream();

    if(imageFile.toLowerCase().endsWith(".jpeg")
       || imageFile.toLowerCase().endsWith(".jpg"))
    {
      InputStream imageIn = this.getServletContext().getResourceAsStream(imageFile);
//      System.out.println("the real imageFile is " + imageFile);
//      System.out.println("the new version");
      //      InputStream imageIn = new FileInputStream(new
      // File(imageFile));
      JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn);
      BufferedImage image = decoder.decodeAsBufferedImage();
      Graphics g = image.getGraphics();

      //设置颜色
      g.setColor(new Color(Integer.parseInt(fontColor,16)));

      //设置字体
      Font mFont = new Font(fontName,Font.PLAIN,fontSize); //默认字体
      if(fontStyle.equalsIgnoreCase("italic"))
        mFont = new Font(fontName,Font.ITALIC,fontSize);
      if(fontStyle.equalsIgnoreCase("bold"))
        mFont = new Font(fontName,Font.BOLD,fontSize);
      if(fontStyle.equalsIgnoreCase("plain"))
        mFont = new Font(fontName,Font.PLAIN,fontSize);
      g.setFont(mFont);

      //输出文字
      g.drawString(text,x,y);

      //输出数据流
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);
      encoder.encode(image);

      imageIn.close();

    }
    //当前生成的时间
    currentSession.setAttribute("verifyPwdTime",new Long(System.currentTimeMillis()));
    currentSession.setAttribute("verifyPwd",text);
    output.close();

  }

  //Process the HTTP Post request
  public void doPost(HttpServletRequest request,HttpServletResponse response)
      throws ServletException,IOException
  {
    doGet(request,response);
  }

  //Clean up resources
  public void destroy()
  {
  }
}