在一张图片上绘制别的图片以及文字。

public String GenerateImage(WebCast_baseinfo base,String code,String customName,String customImg,String customId){
Log.debug("------GenerateImage----start");
String ret = null;
try {
InputStream is = new FileInputStream("/usr/share/tomcat7/webapps/worklite/promotionImage/card.jpg");
JPEGImageDecoder jpegDecoder = JPEGCodec.createJPEGDecoder(is);
BufferedImage buffImg=null;
try{
buffImg = jpegDecoder.decodeAsBufferedImage();
}catch(Exception e){
Log.error(this.getClass().getSimpleName()+"----"+e.getMessage());
}
Log.debug("------GenerateImage----Graphics");
Graphics g = buffImg.getGraphics();
g.setColor(new Color(255,140,0));
double rate=1.0;
Font f = new Font("楷体",Font.ROMAN_BASELINE,30);
FontMetrics fm = sun.font.FontDesignMetrics.getMetrics(f);

g.setFont(f);

String str="";
if(base.getIntroduction()!=null){
str=base.getIntroduction();
}
if(str.length()>16){
String s=str.substring(0,16);
String ss=str.substring(16);
g.drawString(s,(640-fm.stringWidth(s))/2,326);
//MyDrawString(s,(640-fm.stringWidth(s))/2,326,rate,g);
g.drawString(ss,(640-fm.stringWidth(ss))/2,366);
//MyDrawString(ss,(640-fm.stringWidth(ss))/2,366,rate,g);
}else{
g.drawString(str,(640-fm.stringWidth(str))/2,366);
//MyDrawString(str,(640-fm.stringWidth(str))/2,326,rate,g);
}
Font f3 = new Font("楷体",Font.ROMAN_BASELINE,30);
FontMetrics fm3 = sun.font.FontDesignMetrics.getMetrics(f3);
g.setFont(f3);
g.setColor(Color.white);
String str2=base.getwName();

if(str2.length()>16){
String s2=str2.substring(0,16);
String ss2=str2.substring(16);
g.drawString(s2,(640-fm3.stringWidth(s2))/2,426);
g.drawString(ss2,(640-fm3.stringWidth(ss2))/2,466);
//MyDrawString(s2,(640-fm.stringWidth(s2))/2,426,rate,g);
//g.drawString(ss,(640-fm.stringWidth(ss))/2,366);
//MyDrawString(ss2,(640-fm.stringWidth(ss2))/2,466,rate,g);
}else{
g.drawString(str2,(640-fm3.stringWidth(str2))/2,446);
//MyDrawString(str2,(640-fm.stringWidth(str2))/2,446,rate,g);
}

g.setColor(Color.white);
String str3="主讲人:"+base.getSpeaker();
if(str2.length()>16){
g.drawString(str3,(640-fm3.stringWidth(str3))/2,526);
}else{
g.drawString(str3,(640-fm3.stringWidth(str3))/2,506);
}
g.setColor(Color.white);

String str4=DateUtil.toString(base.getStartTime(), "yyyy年MM月dd日 HH:mm")+" 开讲";
if(str2.length()>16){
g.drawString(str4,(640-fm3.stringWidth(str4))/2,586);
}else{
g.drawString(str4,(640-fm3.stringWidth(str4))/2,566);
}

ImageIcon imgIcon3 = new ImageIcon(new URL(customImg),"customImg");

Image img3 = imgIcon3.getImage();

g.drawImage(img3,(640-80)/2,700,80,80,null);

Font f1 = new Font("楷体",Font.BOLD,20);
FontMetrics fm1 = sun.font.FontDesignMetrics.getMetrics(f1);
Font f2 = new Font("楷体",Font.BOLD,24);
FontMetrics fm2 = sun.font.FontDesignMetrics.getMetrics(f2);
g.setFont(f1);
g.setColor(Color.white);
String str6=customName;
String str5="来自 ";
String str7=" 的邀请";
g.drawString(str5,(640-fm1.stringWidth(str5)-fm2.stringWidth(str6)-fm1.stringWidth(str7))/2,816);
//g.setColor(new Color(30,144,255));
g.setFont(f2);
g.drawString(str6,(640-fm1.stringWidth(str5)-fm2.stringWidth(str6)-fm1.stringWidth(str7))/2+fm1.stringWidth(str5),816);
//g.setColor(Color.gray);
g.setFont(f1);
g.drawString(str7,(640-fm1.stringWidth(str5)-fm2.stringWidth(str6)-fm1.stringWidth(str7))/2+fm1.stringWidth(str5)+fm2.stringWidth(str6),816);
ImageIcon imgIcon2 = new ImageIcon(new URL(code),"qrcode");

Image img2 = imgIcon2.getImage();

g.drawImage(img2,(640-185)/2,848,180,180,null);
g.dispose();
String fileName = base.getCompanyId()+"_"+customId+"_"+base.getwId()+".jpg";
LocalFileManager tmpfileMgr = new LocalFileManager();
File tmpFile = tmpfileMgr.getFile(FileConstants.TYPE_DATA, FileConstants.SUBTYPE_HB, fileName, true);
OutputStream os = new FileOutputStream(tmpFile);
JPEGImageEncoder en = JPEGCodec.createJPEGEncoder(os);
en.encode(buffImg);

is.close();

os.close();

IFileManager fileMgr = FileFactory.getFileManager();
fileMgr.moveTempFile(FileConstants.TYPE_DATA, FileConstants.SUBTYPE_HB, fileName, tmpFile);

ret = fileMgr.getHref(FileConstants.TYPE_DATA, FileConstants.SUBTYPE_HB, fileName);
Log.debug("------GenerateImage----end");
} catch (Exception e) {
Log.error(this.getClass().getSimpleName()+"----"+e.getMessage());
}
Log.debug("------GenerateImage---ret--"+ret);
return ret;

}