BigPipe（FaceBook使用的页面加载技术） JAVA实现代码示例
代码如下：在使用队列方面没有仔细斟酌，随便找一个过来，就用了。
注意一点，就是不要把 PrintWriter 的实例对象拿到多线程里去用，否则会出莫名其妙的异常。
import java.io.IOException;
注意一点，就是不要把 PrintWriter 的实例对象拿到多线程里去用，否则会出莫名其妙的异常。
import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class BigPipeServlet extends HttpServlet {
private static ExecutorService executor = Executors.newFixedThreadPool(50);
public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {
final ArrayBlockingQueue<String> q = new ArrayBlockingQueue<String>(6);
for (int i = 0; i < 6; i++) {
final int id = i + 1;
executor.execute(new Runnable() {
public void run() {
try {
Thread.sleep((int) (Math.random() * 10000));
q.put(pagelet("content" + id, "Wohooo" + id));
} catch (InterruptedException e) {
}
}
});
}
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
out
.println("<html><head>"
+ "<script type=\"text/javascript\">function arrived(id,text) { var b=document.getElementById(id); b.innerHTML = text; }</script>"
+ "</head><body>" + "<div>Progressive Loading");
content(out, "content1", "content2", "content3", "content4", "content5", "content6");
out.println("</div>");
for (int i = 0; i < 6; i++) {
try {
out.println(q.take());
out.flush();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
out.println("</body></html>");
}
private void content(PrintWriter writer, String... contentIds) {
for (String id : contentIds) {
writer.println("<div id=\"" + id + "\">-</div>");
}
}
private String pagelet(String id, String content) {
return "<script>" + "arrived(\"" + id + "\", \"" + content + "\");" + "</script>";
}
}