大家好,又见面了,我是全栈君,今天给大家准备了Idea注册码。
1.压缩采样点的简单演示
public class ServletDemo extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; //找一个内存缓冲字节流 ByteArrayOutputStream baos = new ByteArrayOutputStream(); //把数据压缩到缓冲字节流流中 GZIPOutputStream gout = new GZIPOutputStream(baos); //取出数据:压缩后的 byte b[] = data.getBytes();//原始字节 System.out.println("原有数据大小:"+b.length); gout.write(b); gout.close();//保证全部的数据都进入内存缓存流 //取出压缩后的数据 b = baos.toByteArray(); System.out.println("压缩后的数据大小:"+b.length); //输出前一定要告知client压缩方式 response.setHeader("Content-Encoding", "gzip"); response.setContentLength(b.length);//告知client正文的大小 //用server的响应对象输出 ServletOutputStream out = response.getOutputStream(); out.write(b); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
2.全站压缩过滤器的一个简单演示样例
//全站压缩过滤器 public class GzipFilter implements Filter { public void destroy() { } public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest)req; HttpServletResponse response = (HttpServletResponse)resp; GzipHttpServletResponse gresponse = new GzipHttpServletResponse(response); chain.doFilter(request, gresponse);//放行 //压缩代码写在此处 //找一个内存缓冲字节流 ByteArrayOutputStream baos = new ByteArrayOutputStream(); //把数据压缩到缓冲字节流流中 GZIPOutputStream gout = new GZIPOutputStream(baos); //取出数据:压缩后的 byte b[] = gresponse.getOldBytes();//原始字节 System.out.println("原有数据大小:"+b.length); gout.write(b); gout.close();//保证全部的数据都进入内存缓存流 //取出压缩后的数据 b = baos.toByteArray(); System.out.println("压缩后的数据大小:"+b.length); //输出前一定要告知client压缩方式 response.setHeader("Content-Encoding", "gzip"); response.setContentLength(b.length);//告知client正文的大小 //用server的响应对象输出 ServletOutputStream out = response.getOutputStream(); out.write(b); } public void init(FilterConfig filterConfig) throws ServletException { } } class GzipHttpServletResponse extends HttpServletResponseWrapper{ private ByteArrayOutputStream baos = new ByteArrayOutputStream(); private PrintWriter pw; public GzipHttpServletResponse(HttpServletResponse response){ super(response); } //把原始数据封装到一个缓冲流中 @Override public ServletOutputStream getOutputStream() throws IOException { return new MyServletOutputStream(baos); } //字符流:把原始数据封装到一个缓冲流中 @Override public PrintWriter getWriter() throws IOException { pw = new PrintWriter(new OutputStreamWriter(baos, super.getCharacterEncoding()));//字符流转成字节流编码会丢失 return pw; } //返回baos中的缓存数据:原始 public byte[] getOldBytes(){ try { if(pw!=null){ pw.close(); } baos.flush(); } catch (IOException e) { e.printStackTrace(); } return baos.toByteArray(); } } class MyServletOutputStream extends ServletOutputStream{ private ByteArrayOutputStream baos; public MyServletOutputStream(ByteArrayOutputStream baos){ this.baos = baos; } @Override public void write(int b) throws IOException { baos.write(b); } }
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