package net.xdevelop.merge;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

import java.awt.*;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;
import net.xdevelop.util.ParamUtil;

/**
 * 将文字用指定的字体，颜色和大小，嵌入指定图片的指定位置,调用参数:
 * text:  　　　要嵌的文字
 * imageFile: 　JPG图片的虚拟路径
 * x: 　　　　　文字输出的起始X坐标位置
 * y: 　　　　　文字输出的起始Y坐标位置
 * fontColor: 　字体颜色(例fontColor=FFFFFF)
 * fontSize: 　字体大小
 * fontStyle: 　字体风格(斜体,粗体等)
 * fontName: 　字体名称(如仿宋体,宋体等)
 */
public class TextIntoImage extends HttpServlet {
    private static final String CONTENT_TYPE = "image/jpeg;charset=GB2312";

    public void init() throws ServletException {
    }
    /** Process the HTTP Get request */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

        doPost(request,response);

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

        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 {
            //取得参数(ParamUtil类请参看后面附的ParamUtil类代码)
            text = ParamUtil.getParameter(request,"text");
            imageFile = ParamUtil.getParameter(request,"imageFile");
            x = ParamUtil.getIntParameter(request,"x",0);
            y = ParamUtil.getIntParameter(request,"y",0);
            fontColor = ParamUtil.getParameter(request,"fontColor");
            fontSize = ParamUtil.getIntParameter(request,"fontSize",16);
            fontStyle = ParamUtil.getParameter(request,"fontStyle");
            fontName = ParamUtil.getParameter(request,"fontName");
        }
        catch(Exception e) {
            e.printStackTrace();
        }

        ServletOutputStream output=response.getOutputStream();

        if(imageFile.toLowerCase().endsWith(".jpeg")||imageFile.toLowerCase().endsWith(".jpg")) {
            imageFile = getServletContext().getRealPath(imageFile);
            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();
        }
        output.close();
    }
}//////////

import javax.servlet.*;

public class ParamUtil {
  /**
   * 获得request中指定名称的参数值,若有中文乱码问题请增加转码部分
   * @param request ServletRequest对象
   * @param paramName 参数名称
   * @return 如果该变量值存在则返回该值，否则返回""
   */
  public static String getParameter( ServletRequest request, String paramName ) {
    String temp = request.getParameter(paramName);
    if( temp != null && !temp.equals("") ) {
        //若有中文问题，在此添加转码代码，例：temp = new String(temp.getBytes("8859_1"), "GB2312");
        return temp;
    }
    else {
      return "";
    }
  }

  /**
   * 获得request中的int型参数值
   * @param request ServletRequest对象
   * @param paramName 参数名称
   * @param defaultNum 默认值，如果没有返回该值
   * @return 如果该参数值存在则返回其转换为int型的值，否则返回defaultNum
   */
  public static int getIntParameter( ServletRequest request, String paramName, int defaultNum ) {
    String temp = request.getParameter(paramName);
    if( temp != null && !temp.equals("") ) {
      int num = defaultNum;
      try {
          num = Integer.parseInt(temp);
      }
      catch( Exception ignored ) {
      }
      return num;
    }
    else {
      return defaultNum;
    }
  }
}///////////