处理*.do的请求

public class ServiceServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html; charset=GB18030"); request.setCharacterEncoding("GB18030"); response.setCharacterEncoding("GB18030"); PrintWriter out = response.getWriter(); DofContext.setRequest(request); DofContext.setResponse(response); // 根据url得到actionName String actionName = getActionName(request); String methodname = request.getParameter("action"); // 执行action中的方法 DofInvocation invocation = new DofInvocation(actionName); String resultString =""; try { resultString = invocation.execute(methodname); } catch (Exception e) { e.printStackTrace(); } // 返回结果 out.print(resultString); } //分析uri得到action的name private String getActionName(HttpServletRequest request){ String uri=request.getRequestURI(); String actionName=uri.substring(uri.lastIndexOf("/")+1 , uri.indexOf(".do")); return actionName; } //把配置文件的map保存在Context里面 public void init(ServletConfig config) throws ServletException { ServletContext context=config.getServletContext(); Map<String ,Configuration> configMap=new HashMap<String, Configuration>(); try { configMap=ParseDofConfFile.convertPropertyFileToMap(); } catch (IOException e) { e.printStackTrace(); } DofContext.setServletContext(context); DofContext.setConfigurationMap(configMap); System.out.println("===DOF初始化完毕===="); }} 解析配置文件 public class ParseDofConfFile { public static String ACTION_CONF_FILE = "DofConf.xml"; private static final String S_Action = "action"; private static final String S_Mapping = "class-mapping"; private static final String S_ClassName = "class-name"; /** * 解析DofConf.xml文件,将解析出来的数据组装成configuration对象，并放入map中 */ @SuppressWarnings("unchecked") public static Map<String, Configuration> convertPropertyFileToMap() throws IOException { Map<String, Configuration> actionResultMap = new HashMap<String, Configuration>(); InputStream fs = null; try { fs = ParseDofConfFile.class.getClassLoader().getResourceAsStream( ACTION_CONF_FILE); if (fs != null) { SAXReader saxReader = new SAXReader(); Document doc = saxReader.read(fs); if (doc != null) { Element root = doc.getRootElement(); if (root != null) { //取得action节点，并遍历它的只节点 List actionlist = root.elements(S_Action); if (actionlist != null) { Iterator it = actionlist.iterator(); while (it.hasNext()) { Element actionele = (Element) it.next(); if (actionele != null) { //得到class-mapping 和class-name 节点 Element mapele = actionele.element(S_Mapping); Element nameele = actionele.element(S_ClassName); //如果节点不为空，将其值组装成Configuration对象放入map中 if (mapele != null && nameele != null) { String actionName = mapele.getText(); String classname = nameele.getText(); Configuration conf = new Configuration(); conf.setActionName(actionName); conf.setClassName(classname); actionResultMap.put(actionName, conf); } } } } } } } } catch (Exception e) { throw new IOException("解析DofConfig.xml文件出错或文件不存在!"); } finally { if (fs != null) { fs.close(); fs = null; } } return actionResultMap; }} configuration对象 public class Configuration { //请求的action名称 private String actionName; //action对应的类名 private String className; public String getActionName() { return actionName; } public void setActionName(String actionName) { this.actionName = actionName; } public String getClassName() { return className; } public void setClassName(String className) { this.className = className; } public String toString(){ return "actionName="+this.actionName+";classname="+this.className; }} dofContext public class DofContext { //save actioncontext to a map private static Map<String,Object> context=new HashMap<String, Object>(); private DofContext(){ } public static Map<String, Object> getContext() { return context; } public static HttpServletRequest getRequest(){ return (HttpServletRequest)getContext().get(ContextConstant.HTTP_REQUEST); } public static void setRequest(HttpServletRequest request){ getContext().put(ContextConstant.HTTP_REQUEST, request); } public static HttpServletResponse getResponse(){ return (HttpServletResponse)getContext().get(ContextConstant.HTTP_RESPONSE); } public static void setResponse(HttpServletResponse response){ getContext().put(ContextConstant.HTTP_RESPONSE, response); } public static void setServletContext(ServletContext servletContext){ getContext().put(ContextConstant.SERVLET_CONTEXT, servletContext); } public static ServletContext getServletContext(){ return (ServletContext)getContext().get(ContextConstant.SERVLET_CONTEXT); } public static void setConfigurationMap(Map<String,Configuration> configMap){ getContext().put(ContextConstant.ACTION_CONFIG_MAP, configMap); } @SuppressWarnings("unchecked") public static Map<String,Configuration> getConfigurationMap(){ return (Map<String,Configuration>)getContext().get(ContextConstant.ACTION_CONFIG_MAP); }}[code="java"]/** * 通过反射机制调用action中的方法 * @author dengm * */public class DofInvocation { private String actionName; public DofInvocation(String actionName) { this.actionName = actionName; } // 执行action中的方法 @SuppressWarnings("unchecked") public String execute(String methodName) throws Exception { Configuration config = getActionConfiguration(); if (null != config) { String className = config.getClassName(); if (null == methodName || "".equals(methodName)) { methodName = "execute"; } try { Class actionClass = Class.forName(className); Object action = actionClass.newInstance(); Method method = action.getClass().getMethod(methodName, null); String result = (String) method.invoke(action, null); return result; } catch (ClassNotFoundException e) { throw new Exception("配置文件中没有找到类：" + className); } catch (InstantiationException e) { } catch (NoSuchMethodException e) { throw new Exception("类 ：" + className + "中没有相应的方法 >>>" + methodName); } catch (Exception e) { throw new Exception(e.getMessage()); } } return ContextConstant.ACTION_ERROR; } /* * 得到一个action的configuration配置对象 */ @SuppressWarnings("unchecked") public Configuration getActionConfiguration() { Configuration config = new Configuration(); Map<String, Configuration> configMap = (Map<String, Configuration>) DofContext .getConfigurationMap(); if (null != configMap) { config = configMap.get(actionName); } return config; }} [/code]