Annotation转发

 

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


/**
 * 直接跳转到某个物理页面
 * @author <a href="mailto:junzinevercry@gmail.com">junzi</a>
 * @date 2010-08-27
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE,ElementType.METHOD})
public @interface Redirect {
	String value();
}

 

 

	 /**
	 * @param req
	 * @param rep
	 * @param pageClass
	 */
	private void redirect(ServletRequest req, ServletResponse rep,
			Class pageClass) {
		Redirect redirectViewPage = (Redirect) pageClass
				.getAnnotation(Redirect.class);
		if (redirectViewPage != null) {
			HttpServletRequest httpServletRequest = (HttpServletRequest) req;
			String redirectPage = redirectViewPage.value();
			String baseContextPath = httpServletRequest.getScheme() + "://"
					+ httpServletRequest.getServerName() + ":"
					+ httpServletRequest.getServerPort()
					+ httpServletRequest.getContextPath();
			HttpServletResponse httpServletResponse = (HttpServletResponse) rep;
			try {
				httpServletResponse
						.sendRedirect(baseContextPath + redirectPage);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

 

/**
	 * 
	 * @param req
	 * @param rep
	 * @param pageClass
	 */
	private void forward(ServletRequest req, ServletResponse rep,
			Class pageClass) {
		Forward forwardViewPage = (Forward) pageClass
				.getAnnotation(Forward.class);
		if (forwardViewPage != null) {
			String forwardPage = forwardViewPage.value();
			HttpServletRequest request = (HttpServletRequest) req;
			try {
				request.getRequestDispatcher(forwardPage).forward(req, rep);
			} catch (ServletException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

 

	/**
	 * 
	 * @param page
	 * @param req
	 * @param rep
	 */
	private void renderOriginalPage(PageWrapper page, ServletRequest req,
			ServletResponse rep) {
		Renderable renderChain = this.pageDesignPaper.getRenderChain();
		RespStringWrapper Resp = new RespStringWrapper();
		renderChain.render(page, Resp);
		HttpServletResponse httpServletResponse = (HttpServletResponse) rep;
		httpServletResponse.setCharacterEncoding("utf-8");
		httpServletResponse.setContentType("text/html; charset=utf-8");
		String outStr = Resp.getStr();
		// @BaseContextPath
		HttpServletRequest httpServletRequest = (HttpServletRequest) req;
		outStr = outStr.replaceAll(
				"@BaseContextPath",
				httpServletRequest.getScheme() + "://"
						+ httpServletRequest.getServerName() + ":"
						+ httpServletRequest.getServerPort()
						+ httpServletRequest.getContextPath() + "/");
		if (!httpServletResponse.isCommitted()) {
			try {
				PrintWriter out = httpServletResponse.getWriter();
				out.print(outStr);
				out.flush();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}