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spring MVC的一些小技巧
/*** * * @param request * @param beanName : 例如 userDao ,adminDao * @return */ public Object getBean(HttpServletRequest request,String beanName){ WebApplicationContext webApp=RequestContextUtils.getWebApplicationContext(request, request.getSession().getServletContext()); return webApp.getBean(beanName); } /*** * 从WebApplicationContext 获取dao * @param request * @return */ private GenericDaogetDaoByWebApp(HttpServletRequest request){ if(ValueWidget.isNullOrEmpty(dao)){ WebApplicationContext webApp=RequestContextUtils.getWebApplicationContext(request , request.getSession().getServletContext()); try { dao=(GenericDao )webApp.getBean(ValueWidget.title(SystemHWUtil.getFileSuffixName(clz.getName()+"Dao")));//返回的是同一个对象 } catch (NoSuchBeanDefinitionException e) {// e.printStackTrace(); dao=(GenericDao )webApp.getBean(SystemHWUtil.getFileSuffixName(clz.getName()+"Dao"));//返回的是同一个对象 } System.out.println("dao:"+dao); } return dao; }
那么clz 是如何获取的呢?
protected final Classclz = SystemHWUtil.getGenricClassType(getClass());/*** * 获取实际的子类的class * * @param clz * @return */ public static Class getGenricClassType( @SuppressWarnings("rawtypes") Class clz) { Type type = clz.getGenericSuperclass(); if (type instanceof ParameterizedType) { ParameterizedType pt = (ParameterizedType) type; Type[] types = pt.getActualTypeArguments(); if (types.length > 0 && types[0] instanceof Class) { // System.out.println("class:"+types[0]); return (Class) types[0]; } } return (Class) Object.class; }
使用produces
/*** * 登录 * @param model * @param status * @param view * @param session * @param request * @param callback * @return * @throws IOException */ @ResponseBody @RequestMapping(value = "/login", produces = SystemHWUtil.RESPONSE_CONTENTTYPE_JSON_UTF) public String login(Model model, Integer status, UserView view,Integer issavePasswd, HttpSession session, HttpServletRequest request,HttpServletResponse response, String callback) throws IOException { init(request); String content = null; UserDao userDao = (UserDao) getDao(); User user2 = null; Map map = new HashMap(); int login_result = 0; AccessLog accessLog=logInto(request); accessLog.setDescription("会员登录"); if (ValueWidget.isNullOrEmpty(view.getUsername())) { login_result = Constant2.LOGIN_RESULT_USERNAME_EMPTY;//用户名不能为空 accessLog.setOperateResult("用户名不能为空"); } else if (ValueWidget.isNullOrEmpty(view.getPassword())) { login_result = Constant2.LOGIN_RESULT_PASSWORD_EMPTY;//密码不能为空 accessLog.setOperateResult("密码不能为空"); } else if (ValueWidget.isNullOrEmpty(user2 = userDao.getByUsername(view .getUsername()))) { login_result = Constant2.LOGIN_RESULT_USERNAME_INVALID;//用户名不存在 accessLog.setOperateResult("用户名不存在"); } else if (!user2.getPassword().equals(view.getPassword())) { login_result = Constant2.LOGIN_RESULT_FAILED;//登录失败(用户名和密码不匹配) accessLog.setOperateResult("登录失败(用户名和密码不匹配)"); } else { login_result = Constant2.LOGIN_RESULT_SUCCESS; session.setAttribute(Constant2.SESSION_KEY_LOGINED_USER, user2); map.put("session", session.getId());// 下载session id到客户端 map.put("userId", user2.getId());// 下载session id到客户端 System.out.println("session id:" + session.getId()); Map mapCookie=new HashMap(); if(issavePasswd/*包装类型*/!=null&&issavePasswd==1) { //记住密码 mapCookie.put(Constant2.COOKIE_KEY_USERNAME, user2.getUsername()); mapCookie.put(Constant2.COOKIE_KEY_PASSWORD, user2.getPassword()); }else{ mapCookie.put(Constant2.COOKIE_KEY_USERNAME, false); mapCookie.put(Constant2.COOKIE_KEY_PASSWORD, false); } WebServletUtil.rememberMe(request,response,mapCookie); accessLog.setOperateResult("登录成功,session id:"+session.getId()); } // boolean isExist = userDao.isExist(view.getUsername(), // view.getPassword()); map.put(Constant2.LOGIN_RESULT_KEY, login_result); logSave(accessLog, request); content = JSONPUtil.getJsonP(map, callback); return content; } String realpath =WebServletUtil.getUploadPath(request, "upload/download/apk", request .getSession().getServletContext(), Constant2.SRC_MAIN_WEBAPP); /*** * * @param request * @param uploadFolderName * @return */ public static final String getUploadPath(HttpServletRequest request, String uploadFolderName, ServletContext sContext, String webappPath/*src\main\webapp */) { // project name:"/demo_channel_terminal" String projectName = request.getContextPath();// value:/shop_goods or // "/springMVC_upload" String uploadPath = WebServletUtil.getUploadedPath( uploadFolderName/* "upload\" */, projectName, sContext, webappPath/* "src\main\webapp\" */); return uploadPath; }/*** * java web // * D:\xxx\eclipse\workspace\.metadata\.plugins\org.eclipse.wst.server * .core\tmp0\wtpwebapps\shop_goods\images // * D:\xxx\eclipse\workspace\shop_goods\ upload * * @param uploadFolderName * @param projectName * @param sContext * @return */ public static String getUploadedPath(String uploadFolderName, String projectName, ServletContext sContext,String webappPath/*src\main\webapp*/ ) { String uploadFolder_tmp = null; if (uploadFolderName.startsWith(File.separator)) { uploadFolder_tmp = uploadFolderName; } else { uploadFolder_tmp = File.separator + uploadFolderName;// "/upload" } String realpath = sContext.getRealPath(uploadFolder_tmp);//D:\software\eclipse\workspace2\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\springMVC_upload\attached //区别在于是否是使用eclipse 来启动http服务(tomcat) String reg=".metadata\\.plugins"; boolean isContain=realpath.contains(reg); System.out.println("[getUploadedPath]isContain:"+isContain); if(!isContain){ webappPath=null; } // project name ,eg.shop_goods projectName = SystemHWUtil.deleteFrontSlash(projectName); realpath = SystemHWUtil.getRealPath(realpath, projectName); String result=null;//D:\software\eclipse\workspace2\springMVC_upload\src\main\webapp\attached if(!ValueWidget.isNullOrEmpty(webappPath)){ //目的:把"http://localhost:8080/springMVC_upload/upload/image/"变为: //"http://localhost:8080/springMVC_upload/src/main/webapp/upload/image/" result=realpath.replaceAll("("+SystemHWUtil.deleteAfterSlash(uploadFolderName).replaceAll(File.separator.replace("\\", "\\\\")/* 因为\需要转义 */+"$", "") +"[\\/]?)$", webappPath.replace("\\", "\\\\")+"$1"); }else{ result=realpath; } System.out.println("[WebServletUtil.getUploadedPath]result:"+result); return result; } 相关常量
public static final String SRC_MAIN_WEBAPP="src\\main\\webapp\\";
/*** * 登录 * @param model * @param status * @param view * @param session * @param request * @param callback * @return * @throws IOException */ @ResponseBody @RequestMapping(value = "/login", produces = SystemHWUtil.RESPONSE_CONTENTTYPE_JSON_UTF) public String login(Model model, Integer status, UserView view,Integer issavePasswd, HttpSession session, HttpServletRequest request,HttpServletResponse response, String callback) throws IOException { init(request); String content = null; UserDao userDao = (UserDao) getDao(); User user2 = null; Map map = new HashMap(); int login_result = 0; AccessLog accessLog=logInto(request); accessLog.setDescription("会员登录"); if (ValueWidget.isNullOrEmpty(view.getUsername())) { login_result = Constant2.LOGIN_RESULT_USERNAME_EMPTY;//用户名不能为空 accessLog.setOperateResult("用户名不能为空"); } else if (ValueWidget.isNullOrEmpty(view.getPassword())) { login_result = Constant2.LOGIN_RESULT_PASSWORD_EMPTY;//密码不能为空 accessLog.setOperateResult("密码不能为空"); } else if (ValueWidget.isNullOrEmpty(user2 = userDao.getByUsername(view .getUsername()))) { login_result = Constant2.LOGIN_RESULT_USERNAME_INVALID;//用户名不存在 accessLog.setOperateResult("用户名不存在"); } else if (!user2.getPassword().equals(view.getPassword())) { login_result = Constant2.LOGIN_RESULT_FAILED;//登录失败(用户名和密码不匹配) accessLog.setOperateResult("登录失败(用户名和密码不匹配)"); } else { login_result = Constant2.LOGIN_RESULT_SUCCESS; session.setAttribute(Constant2.SESSION_KEY_LOGINED_USER, user2); map.put("session", session.getId());// 下载session id到客户端 map.put("userId", user2.getId());// 下载session id到客户端 System.out.println("session id:" + session.getId()); Map mapCookie=new HashMap(); if(issavePasswd/*包装类型*/!=null&&issavePasswd==1) { //记住密码 mapCookie.put(Constant2.COOKIE_KEY_USERNAME, user2.getUsername()); mapCookie.put(Constant2.COOKIE_KEY_PASSWORD, user2.getPassword()); }else{ mapCookie.put(Constant2.COOKIE_KEY_USERNAME, false); mapCookie.put(Constant2.COOKIE_KEY_PASSWORD, false); } WebServletUtil.rememberMe(request,response,mapCookie); accessLog.setOperateResult("登录成功,session id:"+session.getId()); } // boolean isExist = userDao.isExist(view.getUsername(), // view.getPassword()); map.put(Constant2.LOGIN_RESULT_KEY, login_result); logSave(accessLog, request); content = JSONPUtil.getJsonP(map, callback); return content; }/*** * 用于jsonp调用 * @param map : 用于构造json数据 * @param callback : 回调的javascript方法名 * @param filters : SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter .serializeAllExcept("content"); FilterProvider filters = new SimpleFilterProvider().addFilter( Constant2.SIMPLEFILTER_JACKSON_PAPERNEWS, theFilter); * @return : js函数名(json字符串) */ public static String getJsonP(Object map,String callback,FilterProvider filters) { ObjectMapper mapper = getObjectMapper(); String content = null; ObjectWriter writer=null; try { if(filters!=null){// content = mapper.writer(filters).writeValueAsString(map); writer=mapper.writer(filters); }else{// content = mapper.writeValueAsString(map); writer=mapper.writer(); } content=writer.writeValueAsString(map); System.out.println(content); } catch (JsonGenerationException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } if(ValueWidget.isNullOrEmpty(callback)){ return content; } return callback+"("+content+")"; } /*** * jackson没有过滤 * @param map * @param callback * @return */ public static String getJsonP(Object map,String callback) { return getJsonP(map, callback, null); } public static String getJsonP(Object map) { return getJsonP(map, null, null); } /*** * * @param key * @param value2 * @param callback * @return : js函数名(json字符串) */ public static String getJsonP(String key ,Object value2,String callback){ Map map = new HashMap(); map.put(key, value2); return getJsonP(map, callback); } 前端代码:
/*** * 会员登录 * @param username * @param password */var user_login=function(username,password){// alert(username+","+password); if(isHasLogin()) { alert(LOGIN_MSG_HAVE_LOGINED_ALREADY); //Toast.showShortCenter(LOGIN_MSG_HAVE_LOGINED_ALREADY); return; } showMask2(); $.jsonP({url:'http://'+server_url+'/user/login?callback=?&username='+username+"&password="+password,success:function(data){ var result=data.result; hideMask2(); switch (result) { case 1: window.user={}; window.sessionId=data.session; user.username=username; user.password=password; user.userId=data.userId; settings_before(document.getElementById("settings")); alert("登录成功"); //plugins.toast.showShortCenter("登录成功"); $.ui.goBack(); break; case 3: alert("用户名不能为空"); break; case 4: alert("密码不能为空"); break; case 5: alert("用户名或密码错误"); break; case 2: alert("用户名不存在"); break; } }});} 转载地址：http://yzfcx.baihongyu.com/