這和AbstractExcelView,AbstractPdfView不同，此類是實現View接口，實現自定義的視圖解析
?
package
?Action;
import
?java.awt.image.BufferedImage;
import
?java.util.Map;
import
?javax.servlet.ServletOutputStream;
import
?javax.servlet.http.HttpServletRequest;
import
?javax.servlet.http.HttpServletResponse;
import
?org.springframework.web.servlet.View;
import
?sun.awt.image.codec.JPEGImageEncoderImpl;
import
?com.sun.image.codec.jpeg.JPEGImageEncoder;
public
?
abstract
?
class
?AbstractJpegView?
implements
?View?
{
????
public
?String?getContentType()?
{
????
????????
//
?TODO?自動生成方法存根
????????
return
?
null
;
????}
????
public
?
int
?getImageWidth()
{
return
?
100
;}
????
public
?
int
?getImageHeght()
{
return
?
100
;}
????
protected
?
int
?getImageType()
{
????????
return
?BufferedImage.TYPE_INT_RGB;
????}
????
public
?
void
?render(Map?map,?HttpServletRequest?request,
????????????HttpServletResponse?response)?
throws
?Exception?
{
???????response.setContentType(
"
image/jpeg
"
);
//
設置內容類型
???????BufferedImage?image
=
new
?BufferedImage(
this
.getImageWidth(),
this
.getImageHeght(),
this
.getImageType());
//
緩存圖像
???????buildImage(map,image,request,response);
//
繪制圖像
???????
//
編碼圖像
???????ServletOutputStream?out
=
response.getOutputStream();
???????JPEGImageEncoder?encoder
=
new
?JPEGImageEncoderImpl(out);
???????encoder.encode(image);
???????out.flush();
???????
???????
????}
????
protected
?
abstract
?
void
?buildImage(Map?model,BufferedImage?image,HttpServletRequest?request,HttpServletResponse?response)?
throws
?Exception;
}
?我們只要繼承這個類，實現buildImage方法，就可以輸出人以jpeg圖像了，下面是一個畫圓的簡單實現
?
package
?Action;
import
?java.awt.Graphics;
import
?java.awt.image.BufferedImage;
import
?java.util.Map;
import
?javax.servlet.http.HttpServletRequest;
import
?javax.servlet.http.HttpServletResponse;
public
?
class
?CircleJpegView?
extends
?AbstractJpegView?
{
????
????
protected
?
void
?buildImage(Map?model,?BufferedImage?image,
????????????HttpServletRequest?request,?HttpServletResponse?response)
????????????
throws
?Exception?
{
????????
//
畫圓
????????Graphics?g
=
image.getGraphics();
????????g.drawOval(
0
,
0
,?
this
.getImageWidth(),?
this
.getImageHeght());
????}
????
}
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