Servlet Programming with Servlet Display Pictures

Servlet servlet used to do programming in a tracking image click technology, this module large one, here to talk about with the Servlet display picture part. First talk show with a picture of a process Servlet:

1. Servlet programming in response to set the output type:

The corresponding statement - response. SetContentType ("image / gif; charset = GB2312"),

銆??response 渚胯兘杈撳嚭gif鍥剧墖锛?amp;quot;image/gif;charset=GB2312"渚挎槸杈撳嚭绫诲瀷锛屽綋鐒朵綘鍙互杈撳嚭 "image/jpg;charset=GB2312"绫诲瀷鏂囦欢銆?br />
銆??2. 瀹炵幇Servlet鏄剧ず鍥剧墖涔嬪緱鍒版枃浠舵祦锛?br />
銆??servlet鏄互娴佺殑褰㈠紡浠跺浘鐗囨枃浠朵粠鏈嶅姟鍣ㄨ鍑猴紝閫氳繃response灏嗘祦鍙戝埌娴忚鍣ㄧ殑銆?br />
銆??3. 瀹炵幇Servlet鏄剧ず鍥剧墖涔嬪緱鍒拌緭鍑烘祦锛?br />
銆??瀵瑰簲鐨勮鍙?-OutputStream output = response.getOutputStream(); 褰撶劧锛屽鐞嗗浘鐗囨枃浠堕渶瑕佷互浜岃繘鍒跺舰寮忕殑娴併?

銆??4. 瀹炵幇Servlet鏄剧ず鍥剧墖涔嬫枃浠舵祦鐨勭紪鐮?浣嗕篃涓嶄竴瀹氬繀椤荤紪鐮佺殑锛屽鏋滀笉鏄枃浠舵祦锛屽垯蹇呴』缂栫爜) 鎵?互鎴戠粰澶у涓?釜鐢ㄧ紪鐮佺殑浠ｇ爜鍜屼笉鐢ㄧ紪鐮佺殑浠ｇ爜.

銆??椤轰究璇翠竴鍙ワ紝sun鍏徃浠呮彁渚涗簡jpg鍥剧墖鏂囦欢鐨勭紪鐮乤pi銆?br />
銆??鎴戞兂鍩烘湰娴佺▼閮借瀹屼簡锛屼笅闈㈡垜鎶婁唬鐮佹嬁缁欏ぇ瀹剁湅涓?笅锛屽ぇ瀹惰嚜鐒朵竴鐩簡鐒朵簡锛?br />
銆??package xjw.personal.servet; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import com.sun.image.codec.jpeg.*;

銆??Sun鍏徃浠呮彁渚涗簡jpg鍥剧墖鏂囦欢鐨勭紪鐮乤pi

銆??import javax.imageio.stream.*; import java.awt.*; import java.awt.image.BufferedImage; public class ShowPicture extends HttpServlet{ private static final String GIF="image/gif;charset=GB2312";

銆??瀹炵幇Servlet鏄剧ず鍥剧墖涔嬭瀹氳緭鍑虹殑绫诲瀷

銆??private static final String JPG="image/jpeg;charset=GB2312"; public void init() throws ServletException { } public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { String spec=request.getParameter("spec"); //杈撳嚭鍥剧墖鐨勭被鍨嬬殑鏍囧織 int int_spec=Integer.parseInt(spec); if(spec==1) { String imagePath="/jfgg/b1.jpg"; //鍥剧墖鐩稿web搴旂敤鐨勪綅缃?} else { String imagePath="/jfgg/b2.gif";

銆??鍥剧墖鐩稿web搴旂敤鐨勪綅缃?br />
銆??} OutputStream output = response.getOutputStream();//寰楀埌杈撳嚭娴?if(imagePath.toLowerCase().endsWith(".jpg"))//浣跨敤缂栫爜澶勭悊鏂囦欢娴佺殑鎯呭喌锛?{ response.setContentType(JPG);//璁惧畾杈撳嚭鐨勭被鍨?//寰楀埌鍥剧墖鐨勭湡瀹炶矾寰?imagePath = getServletContext().getRealPath(imagePath);

銆??寰楀埌鍥剧墖鐨勬枃浠舵祦

銆??InputStream imageIn = new FileInputStream(new File(imagePath)); //寰楀埌杈撳叆鐨勭紪鐮佸櫒锛屽皢鏂囦欢娴佽繘琛宩pg鏍煎紡缂栫爜 JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn); //寰楀埌缂栫爜鍚庣殑鍥剧墖瀵硅薄 BufferedImage image = decoder.decodeAsBufferedImage(); //寰楀埌杈撳嚭鐨勭紪鐮佸櫒 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output); encoder.encode(image);//瀵瑰浘鐗囪繘琛岃緭鍑虹紪鐮?imageIn.close();//鍏抽棴鏂囦欢娴?} if(imagePath.toLowerCase().endsWith(".gif"))//涓嶄娇鐢ㄧ紪鐮佸鐞嗘枃浠舵祦鐨勬儏鍐碉細 { response.setContentType(GIF); ServletContext context = getServletContext();//寰楀埌鑳屾櫙瀵硅薄 InputStream imageIn=context.getResourceAsStream(imagePath);//鏂囦欢娴?BufferedInputStream bis=new BufferedInputStream(imageIn);//杈撳叆缂撳啿娴?BufferedOutputStream bos=new BufferedOutputStream(output);//杈撳嚭缂撳啿娴?byte data[]=new byte[4096];//缂撳啿瀛楄妭鏁?int size=0; size=bis.read(data); while (size!=-1) { bos.write(data,0,size); size=bis.read(data); } bis.close(); bos.flush();//娓呯┖杈撳嚭缂撳啿娴?bos.close(); } output.close(); } }

銆??鏈?悗鏄浣曡皟鐢紝浣犲彲浠ョ畝鍗曠殑鏄犲皠涓?笅servelt锛屾垜灏卞皢servet鐨勫悕鏄犲皠涓篠howPic, 浜庢槸涓嬩唬鐮佽皟鐢?br />
銆??锕tml锕ャ? 銆?工body锕ャ? 銆?工img src="ShowPic?spec=2"锕ワ工/a锕?锕?body锕?锕?html锕?br />
銆??Servlet缂栫▼涔嬬敤Servlet鏄剧ず鍥剧墖鐨勪粙缁嶅氨鏄繖鏍峰瓙浜嗭紝閫氳繃涓婅堪鎿嶄綔鍥剧墖渚挎樉绀哄湪htm涓婁簡锛屾晥鏋滃浣曞憿?







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