package org.douyu.mvc;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.douyu.core.ClassResource;
import org.douyu.core.Config;
import org.douyu.core.JavacException;
import org.douyu.core.ResourceLoader;
/**
*
* @author ZHH
*
*/
public class ControllerFilter implements Filter {
private ResourceLoader.Holder holder;
private Config config;
private ServletContext servletContext;
private static final String viewManagerProviderConfig = "org.douyu.plugins.jsp.JspViewManagerProvider=jsp;"
+ "org.douyu.plugins.velocity.VelocityViewManagerProvider=vm;"
+ "org.douyu.plugins.freemarker.FreeMarkerViewManagerProvider=ftl;";
@Override
public void init(FilterConfig filterConfig) throws ServletException {
config = new Config();
servletContext = filterConfig.getServletContext();
config.appName = servletContext.getContextPath();
config.javacEncoding = filterConfig.getInitParameter("javacEncoding");
config.srcDir = filterConfig.getInitParameter("srcDir");
config.classesDir = filterConfig.getInitParameter("classesDir");
if (config.srcDir == null)
config.srcDir = "src";
if (config.classesDir == null)
config.classesDir = "classes";
if (!new File(config.srcDir).isAbsolute())
config.srcDir = filterConfig.getServletContext().getRealPath("WEB-INF/" + config.srcDir);
File f = new File(config.srcDir);
if (!f.exists())
f.mkdirs();
if (!new File(config.classesDir).isAbsolute())
config.classesDir = filterConfig.getServletContext().getRealPath("WEB-INF/" + config.classesDir);
f = new File(config.classesDir);
if (!f.exists())
f.mkdirs();
if ("false".equalsIgnoreCase(filterConfig.getInitParameter("isDevMode")))
config.isDevMode = false;
String vmpConfig = filterConfig.getInitParameter("viewManagerProviderConfig");
if (vmpConfig == null)
vmpConfig = viewManagerProviderConfig;
config.setViewManagerProviderConfig(vmpConfig);
try {
config.addClassPath(config.srcDir);
config.addClassPath(config.classesDir);
} catch (Exception e) {
throw new ServletException(e);
}
holder = ResourceLoader.newHolder(config, getClass().getClassLoader());
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException {
HttpServletRequest hsr = (HttpServletRequest) request;
String path = null;
//if (request.getAttribute("javax.servlet.async.servlet_path") != null)
// path = request.getAttribute("javax.servlet.async.servlet_path").toString();
//异步也相关
if (request.getAttribute("javax.servlet.include.request_uri") != null)
path = request.getAttribute("javax.servlet.include.request_uri").toString();
if (path == null)
path = hsr.getRequestURI(); //path = hsr.getServletPath();
String cpath = hsr.getContextPath();
if (cpath.length() > 1)
path = path.substring(cpath.length());
//以'/'结尾说明是一个目录
if (path.endsWith("/")) {
chain.doFilter(request, response);
return;
}
//path格式: /packageName/controllerClassName.actionName
if (path.startsWith("/"))
path = path.substring(1);
String controllerClassName = path;
String actionName = null;
int dotPos = path.indexOf('.');//谷歌浏览器(Chrome)不支持'|'字符，所以用'."分隔类名和action名
if (dotPos >= 0) {
actionName = path.substring(dotPos + 1).trim();
controllerClassName = path.substring(0, dotPos);
}
controllerClassName = controllerClassName.replace('/', '.');
StringWriter sw = new StringWriter();
PrintWriter javacOut = new PrintWriter(sw);
ClassResource cr = null;
try {
cr = holder.get().loadContextClassResource(controllerClassName, javacOut);
} catch (JavacException e) {
printJavacMessage(sw.toString(), response, e);
return;
}
if (cr != null) {
AbstractContext ac = null;
try {
ac = (AbstractContext) cr.loadedClass.newInstance();
ac.init(config, controllerClassName, servletContext, hsr, (HttpServletResponse) response);
ac.executeAction(actionName);
printJavacMessage(sw.toString(), response, null);
} catch (Exception e) {
throw new ServletException(e);
} finally {
if (ac != null)
ac.free();
}
} else {
chain.doFilter(request, response);
}
}
private static void printJavacMessage(String javacMessage, ServletResponse response, JavacException e) throws IOException {
PrintWriter out = response.getWriter();
if (javacMessage.length() > 0) {
out.println();
out.println("javac message:");
out.println("-----------------------------------");
out.println(javacMessage);
}
if (e != null) {
out.println();
out.println("javac error:");
out.println("-----------------------------------");
e.printStackTrace(out);
}
}
@Override
public void destroy() {
config = null;
servletContext = null;
holder.free();
holder = null;
}
}