下面列出了怎么用javax.servlet.http.PushBuilder的API类实例代码及写法，或者点击链接到github查看源代码。
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PushBuilder pb = request.newPushBuilder();
if (pb != null) {
pb.path("images/javaee-logo.png")
.addHeader("content-type", "image/png")
.push();
}
try (PrintWriter writer = response.getWriter();) {
StringBuilder html = new StringBuilder();
html.append("<html>");
html.append("<center>");
html.append("<img src='images/javaee-logo.png'><br>");
html.append("<h2>Image pushed by ServerPush</h2>");
html.append("</center>");
html.append("</html>");
writer.write(html.toString());
}
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpReq = (HttpServletRequest)request;
PushBuilder builder = httpReq.newPushBuilder();
if (builder != null){
builder
.path("resources/javaee-logo.png")
.path("resources/style.css")
.path("resources/functions.js")
.push();
System.out.println("Resources pushed");
}
chain.doFilter(request, response);
}
@Nullable
public static Object resolvePushBuilder(HttpServletRequest request, Class<?> paramType) {
PushBuilder pushBuilder = request.newPushBuilder();
if (pushBuilder != null && !paramType.isInstance(pushBuilder)) {
throw new IllegalStateException(
"Current push builder is not of type [" + paramType.getName() + "]: " + pushBuilder);
}
return pushBuilder;
}
@Before
public void setup() throws Exception {
resolver = new ServletRequestMethodArgumentResolver();
mavContainer = new ModelAndViewContainer();
servletRequest = new MockHttpServletRequest("GET", "");
webRequest = new ServletWebRequest(servletRequest, new MockHttpServletResponse());
method = getClass().getMethod("supportedParams", ServletRequest.class, MultipartRequest.class,
HttpSession.class, Principal.class, Locale.class, InputStream.class, Reader.class,
WebRequest.class, TimeZone.class, ZoneId.class, HttpMethod.class, PushBuilder.class);
}
@SuppressWarnings("unused")
public void supportedParams(ServletRequest p0,
MultipartRequest p1,
HttpSession p2,
Principal p3,
Locale p4,
InputStream p5,
Reader p6,
WebRequest p7,
TimeZone p8,
ZoneId p9,
HttpMethod p10,
PushBuilder p11) {
}
@Override
public PushBuilder newPushBuilder() {
if (exchange.isPushSupported()) {
return new PushBuilderImpl(this);
}
return null;
}
@Nullable
public static Object resolvePushBuilder(HttpServletRequest request, Class<?> paramType) {
PushBuilder pushBuilder = request.newPushBuilder();
if (pushBuilder != null && !paramType.isInstance(pushBuilder)) {
throw new IllegalStateException(
"Current push builder is not of type [" + paramType.getName() + "]: " + pushBuilder);
}
return pushBuilder;
}
@Before
public void setup() throws Exception {
resolver = new ServletRequestMethodArgumentResolver();
mavContainer = new ModelAndViewContainer();
servletRequest = new MockHttpServletRequest("GET", "");
webRequest = new ServletWebRequest(servletRequest, new MockHttpServletResponse());
method = getClass().getMethod("supportedParams", ServletRequest.class, MultipartRequest.class,
HttpSession.class, Principal.class, Locale.class, InputStream.class, Reader.class,
WebRequest.class, TimeZone.class, ZoneId.class, HttpMethod.class, PushBuilder.class);
}
@SuppressWarnings("unused")
public void supportedParams(ServletRequest p0,
MultipartRequest p1,
HttpSession p2,
Principal p3,
Locale p4,
InputStream p5,
Reader p6,
WebRequest p7,
TimeZone p8,
ZoneId p9,
HttpMethod p10,
PushBuilder p11) {
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PushBuilder pushBuilder = request.newPushBuilder();
if (pushBuilder != null) {
pushBuilder.path("images/hero-banner.jpg").push();
pushBuilder.path("css/menu.css").push();
pushBuilder.path("js/marquee.js").push();
}
getServletContext().getRequestDispatcher("/duke.jsp").forward(request, response);
}
@Override
public PushBuilder newPushBuilder() {
if(exchange.getConnection().isPushSupported()) {
return new PushBuilderImpl(this);
}
return null;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
PushBuilder pushBuilder = req.newPushBuilder().
path("main.css");
pushBuilder.push();
res.getWriter().println("<html><head><title>HTTP2 Test</title><link rel=\"stylesheet\" href=\"main.css\"></head><body>Hello Servlet Push!!!</body></html>");
}
@GetMapping(path = "/demoWithPush")
public String demoWithPush(PushBuilder pushBuilder) {
if (null != pushBuilder) {
pushBuilder.path("resources/logo.png").push();
}
return "demo";
}
@Override
public PushBuilder setHeader(String name, String value) {
headers.set(name, value);
return this;
}
@Override
public PushBuilder addHeader(String name, String value) {
headers.add(name, value);
return this;
}
@Override
public PushBuilder removeHeader(String name) {
headers.remove(name);
return this;
}
private void doRequest(HttpServletRequest request, HttpServletResponse response) throws IOException{
String usePush = request.getParameter("usePush");
if ("true".equalsIgnoreCase(usePush)){
PushBuilder pb = request.newPushBuilder();
if (pb != null) {
for(int row=0; row < 5; row++){
for(int col=0; col < 8; col++){
pb.path("image/keyboard_buttons/keyboard_buttons-" + row + "-" + col + ".jpeg")
.addHeader("content-type", "image/jpeg")
.push();
}
}
}
}
try (PrintWriter writer = response.getWriter()) {
StringBuilder html = new StringBuilder();
html.append("<html>");
html.append("<center>");
html.append("<table cellspacing='0' cellpadding='0' border='0'>");
for(int row=0; row < 5; row++){
html.append(" <tr>");
for(int col=0; col < 8; col++){
html.append(" <td>");
html.append("<img src='image/keyboard_buttons/keyboard_buttons-" + row + "-" + col + ".jpeg' style='width:100px; height:106.25px;'>");
html.append(" </td>");
}
html.append(" </tr>");
}
html.append("</table>");
html.append("<br>");
if ("true".equalsIgnoreCase(usePush)){
html.append("<h2>Image pushed by ServerPush</h2>");
} else{
html.append("<h2>Image loaded using HTTP/1.0</h2>");
}
html.append("</center>");
html.append("</html>");
writer.write(html.toString());
}
}
@Override
public PushBuilder setHeader(String name, String value) {
headers.put(new HttpString(name), value);
return this;
}
@Override
public PushBuilder addHeader(String name, String value) {
headers.add(new HttpString(name), value);
return this;
}
@Override
public PushBuilder removeHeader(String name) {
headers.remove(name);
return this;
}