wordpress音乐站源码,云开放平台,手机怎做网站,磁县企业做网站推广文章目录 【README】【1】HanderMapping-处理器映射容器【1.1】HanderMapping实现类【1.1.1】SimpleUrlHandlerMapping 【2】Controller#xff08;二级控制器#xff09;【2.1】AbstractController抽象控制器#xff08;控制器基类#xff09; 【3】ModelAndView(模型与视… 文章目录 【README】【1】HanderMapping-处理器映射容器【1.1】HanderMapping实现类【1.1.1】SimpleUrlHandlerMapping 【2】Controller二级控制器【2.1】AbstractController抽象控制器控制器基类 【3】ModelAndView(模型与视图)【3.1】ModelAndView中的视图信息【3.2】ModelAndView中的模型数据 【4】ViewResolver视图解析器【4.1】可用的ViewResolver实现类【4.1.1】单一视图类型的视图解析器以UrlBasedViewResolver为基类【4.1.2】多视图类型的视图解析器 【5】View视图【5.1】View实现原理【5.2】View实现类基类AbstractView【5.3】AbstractView的子类AbstractUrlBasedView【5.3.1】使用jsp技术的view【5.3.2】使用通用模版技术的view【5.3.3】面向二进制文档格式的View【5.3.4】重定向视图RedirectView【5.3.5】使用XSLT技术的View 【5.4】自定义View实现 【README】
本文总结自《spring揭秘》作者王福强非常棒的一本书墙裂推荐 代码详情参见 springmvcDiscoverFirstDemo【github】
1springmvc有5个主要组件
HandlerMapping 封装请求标识与二级控制器映射关系Controller二级控制器ModelAndView封装模型数据与视图ViewResovler视图解析器View视图
2DispatcherServlet使用上述5个组件处理web请求的流程把它们串起来
DispatcherServlet一级控制器根据请求标识如URL从HandlerMapping查找对应二级控制器Controller并把请求转发给该ControllerController处理完成后返回ModelAndView模型数据视图给DispatcherServlet一级控制器DispatcherServlet一级控制器根据ModelAndView对象通过视图解析器ViewResolver获取视图实例ViewDispatcherServlet一级控制器调用view.render()方法做实际的视图渲染 【1】HanderMapping-处理器映射容器
1HandlerMapping 用于封装请求标识如URL与二级控制器Controller处理器间的映射关系 它实际上是一个接口
【HandlerMapping】
public interface HandlerMapping {String BEST_MATCHING_HANDLER_ATTRIBUTE HandlerMapping.class.getName() .bestMatchingHandler;/** deprecated */DeprecatedString LOOKUP_PATH HandlerMapping.class.getName() .lookupPath;String PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE HandlerMapping.class.getName() .pathWithinHandlerMapping;String BEST_MATCHING_PATTERN_ATTRIBUTE HandlerMapping.class.getName() .bestMatchingPattern;String INTROSPECT_TYPE_LEVEL_MAPPING HandlerMapping.class.getName() .introspectTypeLevelMapping;String URI_TEMPLATE_VARIABLES_ATTRIBUTE HandlerMapping.class.getName() .uriTemplateVariables;String MATRIX_VARIABLES_ATTRIBUTE HandlerMapping.class.getName() .matrixVariables;String PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE HandlerMapping.class.getName() .producibleMediaTypes;default boolean usesPathPatterns() {return false;}NullableHandlerExecutionChain getHandler(HttpServletRequest request) throws Exception;
}【1.1】HanderMapping实现类
1常用HanderMapping实现类列表
BeanNameUrlHandlerMapping bean名称与url处理器映射即一级控制器DispatcherServlet查找BeanName与请求url路径相同的二级控制器 并把请求转发给该二级控制器处理SimpleUrlHandlerMapping 简单URL处理器映射 相比BeanNameUrlHandlerMapping SimpleUrlHandlerMapping能够提供更多灵活匹配模式 【1.1.1】SimpleUrlHandlerMapping
1为什么有了BeanNameUrlHandlerMapping 还需要 SimpleUrlHandlerMapping
2SimpleUrlHandlerMapping作用
可以配置web请求到具体二级控制器的映射可以把一组或多组拥有相似特征的web请求映射给二级控制器
!-- SimpleUrlHandlerMapping: 可以配置web请求到具体二级控制器的映射, 可以把一组或多组拥有相似特征的web请求映射给二级控制器--bean idhandlerMapping classorg.springframework.web.servlet.handler.SimpleUrlHandlerMapping!-- 设置SimpleUrlHandlerMapping优先级为1优先匹配若有多个HandlerMapping时 --property nameorder value1 /property namemappingsvalue/userController.douserController/bankCard*.dobankCardController/bankCard/*.dobankCardController/value/property/bean3一级控制器DispatcherServlet可以有多个HandlerMapping 请求匹配时哪个HandlerMapping优先匹配哪个最后匹配呢
HandlerMapping的优先级规定遵循spring框架内一贯的Ordered接口所规定的语义HandlerMapping接口的实现类都实现了Ordered接口在配置HandlerMapping时只需要指定其 order属性即可 【2】Controller二级控制器
1Controller是springmvc框架支持的用于处理具体web请求的处理器类型之一
【Controller】二级控制器
FunctionalInterface
public interface Controller {NullableModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception;
}2当然我们可以自行实现Controller接口包括请求参数的抽取请求编码的设定session管理国际化信息处理异常处理等
但为了简化开发成本这些Controller细节springmvc已经有现成实现我们复用即可
3总结起来springmvc提供了一套封装Controller细节的实现类如下。 4Controller可以分为两类 基于servletapi的没有封装细节的控制器 封装处理细节的规范操作控制器
基于servletapi的自行处理细节的控制器包括 AbstractControllerMultiActionController 控制器处理细节逻辑包括从HttpServletRequest获取参数 然后参数验证调用业务层逻辑最终返回一个 ModelAndView 特别的还可以自行通过 HttpServletResponse 输出最终的视图 封装处理细节的规范操作控制器BaseCommandController及子类 封装的细节如下 自动抽取请求参数并绑定到 Command对象提供统一的数据验证方式 BaseCommandController及子类可以接受 Validator进行数据验证我们可以提供具体Validator实现规范化表单请求的处理流程 并且对简单的多页面表单请求处理提供支持
显然 使用规范操作控制器可以复用springmvc封装好的处理细节或者自行实现部分细节开发成本低
【注意】本文使用的spring版本是6.1.10本文发现6.1.10中有AbstractController但没有MultiActionController BaseCommandController及其子类所以Controller二级控制器章节仅做了解 【2.1】AbstractController抽象控制器控制器基类
1AbstractController是所有控制器基类该类通过模版方法模式定义了控制器处理细节的主要步骤
管理当前Controller所支持的请求方法类型GET/POST管理页面的缓存设置 即是否允许浏览器缓存当前页面管理执行流程在会话上的同步
我们需要做的是 重写AbstractController#handleRequestInternal()模版方法实现具体业务逻辑处理
【AbstractController】
public abstract class AbstractController extends WebContentGenerator implements Controller {private boolean synchronizeOnSession;public AbstractController() {this(true);}public AbstractController(boolean restrictDefaultSupportedMethods) {super(restrictDefaultSupportedMethods);this.synchronizeOnSession false;}public final void setSynchronizeOnSession(boolean synchronizeOnSession) {this.synchronizeOnSession synchronizeOnSession;}public final boolean isSynchronizeOnSession() {return this.synchronizeOnSession;}Nullablepublic ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {if (HttpMethod.OPTIONS.matches(request.getMethod())) {response.setHeader(Allow, this.getAllowHeader());return null;} else {this.checkRequest(request);this.prepareResponse(response);if (this.synchronizeOnSession) {HttpSession session request.getSession(false);if (session ! null) {Object mutex WebUtils.getSessionMutex(session);synchronized(mutex) {return this.handleRequestInternal(request, response);}}}return this.handleRequestInternal(request, response); // 处理请求内部逻辑}}Nullableprotected abstract ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception;
}【UserController】
public class UserController extends AbstractController {private UserAppService userAppService;Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {System.out.println(handleRequestInternal 被访问了);ModelAndView modelAndView new ModelAndView(userListPage);modelAndView.addObject(userList, userAppService.listUser());return modelAndView;}public void setUserAppService(UserAppService userAppService) {this.userAppService userAppService;}
}【3】ModelAndView(模型与视图)
1ModelAndView 包含2部分信息包括视图内容逻辑视图名称或具体视图实例模型数据
2ModelAndView实际上是一个数据对象通过该对象可以使得web请求处理逻辑与视图渲染解耦开 【3.1】ModelAndView中的视图信息
1ModelAndView可以以逻辑视图名的形式或者View视图实例的形式来保存视图信息
【DispatcherServlet#render()】
protected void render(ModelAndView mv, HttpServletRequest request, HttpServletResponse response) throws Exception {Locale locale this.localeResolver ! null ? this.localeResolver.resolveLocale(request) : request.getLocale();response.setLocale(locale);String viewName mv.getViewName();View view;if (viewName ! null) { // 若ModelAndView中逻辑视图名存在则通过逻辑视图名获取视图实例 view this.resolveViewName(viewName, mv.getModelInternal(), locale, request);if (view null) {String var10002 mv.getViewName();throw new ServletException(Could not resolve view with name var10002 in servlet with name this.getServletName() );}} else { // 若逻辑视图名【不】存在则直接通过 ModelAndView 获取视图实例 view mv.getView(); if (view null) {throw new ServletException(ModelAndView [ mv ] neither contains a view name nor a View object in servlet with name this.getServletName() );}} // ...view.render(mv.getModelInternal(), request, response); // 获取视图实例后渲染 //...
}2由上述代码可知
若ModelAndView中逻辑视图名存在则通过逻辑视图名获取视图实例若逻辑视图名【不】存在则直接通过 ModelAndView 获取视图实例 【3.2】ModelAndView中的模型数据
1ModelAndView通过 ModelMap来保存模型数据 通过构造方法传入或实例方法添加的模型数据添加到这个ModelMap中
2ModelAndView封装模型数据的代码示例
public class UserController extends AbstractController {private UserAppService userAppService;Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {System.out.println(handleRequestInternal 被访问了);ModelAndView modelAndView new ModelAndView(userListPage);modelAndView.addObject(userList, userAppService.listUser());return modelAndView;}public void setUserAppService(UserAppService userAppService) {this.userAppService userAppService;}
}【ModelAndView】
public ModelAndView addObject(String attributeName, Nullable Object attributeValue) {this.getModelMap().addAttribute(attributeName, attributeValue);return this;}
//
public ModelMap getModelMap() {if (this.model null) {this.model new ModelMap();}return this.model;}
// ModelMap 定义
public class ModelMap extends LinkedHashMapString, Object {// ...
}【4】ViewResolver视图解析器
1视图解析器通过ModelAndView中的逻辑视图名为一级控制器DispatcherServlet返回一个视图实例
【DispatcherServlet#resolveViewName()】
protected View resolveViewName(String viewName, Nullable MapString, Object model, Locale locale, HttpServletRequest request) throws Exception {if (this.viewResolvers ! null) {Iterator var5 this.viewResolvers.iterator();while(var5.hasNext()) {ViewResolver viewResolver (ViewResolver)var5.next();View view viewResolver.resolveViewName(viewName, locale); // 视图解析器通过视图逻辑名获取视图实例 if (view ! null) {return view;}}}return null;}【BeanNameViewResolver】视图解析器具体实现
public View resolveViewName(String viewName, Locale locale) throws BeansException {ApplicationContext context this.obtainApplicationContext();if (!context.containsBean(viewName)) {return null;} else if (!context.isTypeMatch(viewName, View.class)) {if (this.logger.isDebugEnabled()) {this.logger.debug(Found bean named viewName but it does not implement View);}return null;} else {return (View)context.getBean(viewName, View.class); // 实际上是从spring容器中根据视图名或beanName获取View实例对象 }
}2视图解析器接口 ViewResolver 其常用实现类是BeanNameViewResolver或者AbstractCachingViewResolver子类
针对每次请求都重新实例化View可能影响性能所以AbstractCachingViewResolver是对View做了缓存功能的视图解析器 默认启用缓存功能可以通过setCache(boolean)重新设置缓存开关
【AbstractCachingViewResolver】
public void setCache(boolean cache) {this.cacheLimit cache ? 1024 : 0;
}【4.1】可用的ViewResolver实现类
1springmvc提供的ViewResolver实现类分为2类
支持单一视图类型的视图解析器支持多种视图类型的视图解析器 【4.1.1】单一视图类型的视图解析器以UrlBasedViewResolver为基类
1单一视图解析器顾名思义仅支持一种视图类型的视图解析 基类是UrlBasedViewResolver
2UrlBasedViewResolver子类如下
InternalResourceViewResolver 对应 InternalResourceView视图类型的解析即处理jsp模型的视图默认视图解析器FreeMarkerViewResolver 对应 FreeMarker视图模版的解析XsltViewResolver根据逻辑视图名查找并返回XsltView类型的View实例
3单一视图类型的视图解析器使用
使用prefix属性指定模版所在路径使用suffix属性指定模版文件的后缀名对应的视图解析器就可以根据 [prefix] viewName逻辑视图名 [suffix] 拼接成的URL找到对应模版文件并构造对应view实例返回 【4.1.2】多视图类型的视图解析器
1多视图类型的视图解析器可以对多种视图类型的视图进行解析
2多视图类型的视图解析器有3个ResourceBundleViewResolver XmlViewResolver BeanNameViewResolver
3在dispatcher-servlet.xml可以注册多个视图解析器dispatcher-servlet.xml是一级控制器DispatcherServlet加载依赖组件时读取的xml配置文件在web.xml中配置
【dispatcher-servlet.xml】
!-- 注册视图解析器bean到springweb容器一级控制器DispatcherServlet的web容器WebApplicationContext --
bean idviewResolver classorg.springframework.web.servlet.view.InternalResourceViewResolverproperty nameprefix value/WEB-INF/jsp/ /property namesuffix value.jsp /
/bean!-- 注册BeanNameViewResolver视图解析器到springweb容器一级控制器DispatcherServlet的web容器WebApplicationContext --
bean idbeanNameViewResolver classorg.springframework.web.servlet.view.BeanNameViewResolverproperty nameorder value1 /
/bean4与可以配置多个HandlerMapping类似dispatcher-servlet.xml也可以配置多个视图解析器
通过指定order属性设置视图解析器优先级若没有配置视图解析器或DispatcherServlet没有在当前的WebApplicationContext中找到任何ViewResolver定义则默认使用 InternalResourceViewResolver 作为视图解析器 建议把InternalResourceViewResolver 优先级设置最低作为兜底 【5】View视图
1View视图是springmvc中把视图渲染逻辑从DispatcherServlet解耦出来的关键组件 通过实现View接口 我们可以支持多种视图渲染技术
2视图渲染 通过view.render()方法实现
DispatcherServlet一级控制器根据请求标识如URL从HandlerMapping查找对应二级控制器Controller并把请求转发给该ControllerController处理完成后返回ModelAndView给DispatcherServlet一级控制器DispatcherServlet一级控制器根据ModelAndView对象通过视图解析器ViewResolver获取视图实例ViewDispatcherServlet一级控制器调用view.render()方法做实际的视图渲染
【DispatcherServlet】
protected void render(ModelAndView mv, HttpServletRequest request, HttpServletResponse response) throws Exception {Locale locale this.localeResolver ! null ? this.localeResolver.resolveLocale(request) : request.getLocale();response.setLocale(locale);String viewName mv.getViewName(); View view;if (viewName ! null) { // 逻辑视图名不为空 view this.resolveViewName(viewName, mv.getModelInternal(), locale, request); // 解析该逻辑视图名得到视图实例 if (view null) {String var10002 mv.getViewName();throw new ServletException(Could not resolve view with name var10002 in servlet with name this.getServletName() );}} else {view mv.getView(); // 否则直接从 ModelAndView 中获取视图实例 if (view null) {throw new ServletException(ModelAndView [ mv ] neither contains a view name nor a View object in servlet with name this.getServletName() );}}if (this.logger.isTraceEnabled()) {this.logger.trace(Rendering view [ view ] );}try {if (mv.getStatus() ! null) {request.setAttribute(View.RESPONSE_STATUS_ATTRIBUTE, mv.getStatus());response.setStatus(mv.getStatus().value());}view.render(mv.getModelInternal(), request, response); // 视图渲染 } catch (Exception var8) {if (this.logger.isDebugEnabled()) {this.logger.debug(Error rendering view [ view ], var8);}throw var8;}
}【AbstractView#render()】 视图渲染方法
public void render(Nullable MapString, ? model, HttpServletRequest request, HttpServletResponse response) throws Exception {if (this.logger.isDebugEnabled()) {Log var10000 this.logger;String var10001 this.formatViewName();var10000.debug(View var10001 , model (model ! null ? model : Collections.emptyMap()) (this.staticAttributes.isEmpty() ? : , static attributes this.staticAttributes));}MapString, Object mergedModel this.createMergedOutputModel(model, request, response); // 合并模型数据 this.prepareResponse(request, response);this.renderMergedOutputModel(mergedModel, this.getRequestToExpose(request), response); // 渲染合并内后的模型数据
} 【5.1】View实现原理
1View视图的工作 使用相应的技术API将模版和最终提供的模型数据合并在一起 最终输出结果页面给客户端
【JstlView】jstl标签视图继承InternalResourceViewjsp视图
public class JstlView extends InternalResourceView {Nullableprivate MessageSource messageSource;public JstlView() {}public JstlView(String url) {super(url);}public JstlView(String url, MessageSource messageSource) {this(url);this.messageSource messageSource;}protected void initServletContext(ServletContext servletContext) {if (this.messageSource ! null) {this.messageSource JstlUtils.getJstlAwareMessageSource(servletContext, this.messageSource);}super.initServletContext(servletContext);}protected void exposeHelpers(HttpServletRequest request) throws Exception {if (this.messageSource ! null) {JstlUtils.exposeLocalizationContext(request, this.messageSource);} else {JstlUtils.exposeLocalizationContext(new RequestContext(request, this.getServletContext()));}}
}【5.2】View实现类基类AbstractView
1View基类AbstractView 所有视图类都继承AbstractView
【AbstractView】
public abstract class AbstractView extends WebApplicationObjectSupport implements View, BeanNameAware {public static final String DEFAULT_CONTENT_TYPE text/html;charsetISO-8859-1;private static final int OUTPUT_BYTE_ARRAY_INITIAL_SIZE 4096;Nullableprivate String contentType text/html;charsetISO-8859-1;Nullableprivate String requestContextAttribute;private final MapString, Object staticAttributes new LinkedHashMap(); // 静态属性 ... // 视图渲染 public void render(Nullable MapString, ? model, HttpServletRequest request, HttpServletResponse response) throws Exception {if (this.logger.isDebugEnabled()) {Log var10000 this.logger;String var10001 this.formatViewName();var10000.debug(View var10001 , model (model ! null ? model : Collections.emptyMap()) (this.staticAttributes.isEmpty() ? : , static attributes this.staticAttributes));}MapString, Object mergedModel this.createMergedOutputModel(model, request, response); // 1 合并模型数据 this.prepareResponse(request, response); // 2 准备响应报文 this.renderMergedOutputModel(mergedModel, this.getRequestToExpose(request), response); // 3 渲染模型数据}// 合并模型数据 protected MapString, Object createMergedOutputModel(Nullable MapString, ? model, HttpServletRequest request, HttpServletResponse response) {MapString, Object pathVars this.exposePathVariables ? (Map)request.getAttribute(View.PATH_VARIABLES) : null;int size this.staticAttributes.size();size model ! null ? model.size() : 0;size pathVars ! null ? pathVars.size() : 0;MapString, Object mergedModel CollectionUtils.newLinkedHashMap(size); // 合并后的模型数据容器mapmergedModel.putAll(this.staticAttributes); // 合并静态属性 if (pathVars ! null) {mergedModel.putAll(pathVars); // 合并路径变量}if (model ! null) {mergedModel.putAll(model); // 合并ModelAndView模型数据 }if (this.requestContextAttribute ! null) {// 合并请求上下文数据 mergedModel.put(this.requestContextAttribute, this.createRequestContext(request, response, mergedModel));}return mergedModel;}protected RequestContext createRequestContext(HttpServletRequest request, HttpServletResponse response, MapString, Object model) {return new RequestContext(request, response, this.getServletContext(), model);}// 准备响应报文 protected void prepareResponse(HttpServletRequest request, HttpServletResponse response) {if (this.generatesDownloadContent()) {response.setHeader(Pragma, private);response.setHeader(Cache-Control, private, must-revalidate);}}
}2AbstractView定义的视图渲染流程
合并模型数据合并静态属性合并路径变量合并ModelAndView模型数据 合并请求上下文数据 准备响应报文若是下载文件则设置响应头渲染模型数据调用renderMergedOutputModel()方法渲染但该方法是抽象方法需要子类实现 【5.3】AbstractView的子类AbstractUrlBasedView
1AbstractUrlBasedView继承自AbstractView仅定义了一个url属性
所有需要指定url的视图都继承AbstractUrlBasedView不需要指定url的视图继承 AbstractView如二进制文件视图
【AbstractUrlBasedView】
public abstract class AbstractUrlBasedView extends AbstractView implements InitializingBean {Nullableprivate String url;protected AbstractUrlBasedView() {}protected AbstractUrlBasedView(String url) {this.url url;}public void setUrl(Nullable String url) {this.url url;}Nullablepublic String getUrl() {return this.url;}public void afterPropertiesSet() throws Exception {if (this.isUrlRequired() this.getUrl() null) {throw new IllegalArgumentException(Property url is required);}}protected boolean isUrlRequired() {return true;}public boolean checkResource(Locale locale) throws Exception {return true;}public String toString() {String var10000 super.toString();return var10000 ; URL [ this.getUrl() ];}
}【5.3.1】使用jsp技术的view
1使用jsp技术的view
InternalResourceView 支持jsp技术的主要视图类JstlView支持jstl标签的视图类 【5.3.2】使用通用模版技术的view
1通用模版技术包括 FreeMarker Velocity Groovy
FreeMarkerViewVelocityVIewGroovyMarkupView
2FreeMarkerView 与 VelocityVIew 都继承自 AbstractTemplateView 如下 【5.3.3】面向二进制文档格式的View
1二进制文档包括pdfexcel 图片等
AbstractPdfView pdf视图AbstractPdfStamperView pdf视图AbstractXlsView excel视图AbstractXlsxView excel实体AbstractXlsxStreamingView excel视图
public abstract class AbstractPdfView extends AbstractView {public AbstractPdfView() {this.setContentType(application/pdf);}...
}public abstract class AbstractPdfStamperView extends AbstractUrlBasedView {public AbstractPdfStamperView() {this.setContentType(application/pdf);}...
}public abstract class AbstractXlsView extends AbstractView {public AbstractXlsView() {this.setContentType(application/vnd.ms-excel);}...
}public abstract class AbstractXlsxView extends AbstractXlsView {public AbstractXlsxView() {this.setContentType(application/vnd.openxmlformats-officedocument.spreadsheetml.sheet);}protected Workbook createWorkbook(MapString, Object model, HttpServletRequest request) {return new XSSFWorkbook();}
}public abstract class AbstractXlsxStreamingView extends AbstractXlsxView {public AbstractXlsxStreamingView() {}protected SXSSFWorkbook createWorkbook(MapString, Object model, HttpServletRequest request) {return new SXSSFWorkbook();}protected void renderWorkbook(Workbook workbook, HttpServletResponse response) throws IOException {super.renderWorkbook(workbook, response);((SXSSFWorkbook)workbook).dispose();}
} 【5.3.4】重定向视图RedirectView
1springmvc实现重定向的两种方式
方式1新建 RedirectView并封装到ModelAndView返回 若RedirectView的 http10Compatible属性为true RedirectView将直接通过HttpServletResponse的sendRedirect() 方法进行重定向否则 通过设置http状态为303以及http header(“Location”) 达到相同目的 方式2逻辑视图名称前使用 redirect 或 forward前缀
【UserController】重定向
public class UserController extends AbstractController {private UserAppService userAppService;Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {ModelAndView modelAndView new ModelAndView();modelAndView.addObject(userList, userAppService.listUser());// 方式1 通过RedirectView实现重定向
// modelAndView.setView(new RedirectView(bankCardList.do));// 方式2 逻辑视图名称前新增redirect 前缀实现重定向modelAndView new ModelAndView(redirect:bankCardList.do);return modelAndView;}public void setUserAppService(UserAppService userAppService) {this.userAppService userAppService;}
}重定向效果 【5.3.5】使用XSLT技术的View
1XSLT技术 在计算机科学中可扩展样式表转换语言英语Extensible Stylesheet Language Transformations缩写XSLT是一种样式转换标记语言可以将XML数据转换为另外的XML或其它格式。
XsltView 【5.4】自定义View实现
1业务场景通过springmvc的pdf视图展示pdf文件
2自定义view需要继承 AbstractUrlBasedView或者 AbstractView
【PdfUrlViewController】
public class PdfUrlViewController extends AbstractController {Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response) throws Exception {ModelAndView modelAndView new ModelAndView();modelAndView.setView(TomPdfView.build(getClass().getResource(/).getPath() /socialNetworkPropagation.pdf));return modelAndView;}
}【TomPdfView】自定义View类继承 AbstractUrlBasedView
public class TomPdfView extends AbstractUrlBasedView {public TomPdfView(String url) {super(url);setContentType(application/pdf);}public static TomPdfView build(String url) {return new TomPdfView(url);}Overrideprotected void renderMergedOutputModel(MapString, Object model, HttpServletRequest request, HttpServletResponse response) throws Exception {response.setContentType(getContentType());InputStream inputStream new FileInputStream(getUrl());OutputStream outputStream response.getOutputStream();BusiIOUtils.copy(inputStream, outputStream);outputStream.flush();inputStream.close();outputStream.close();}
}【dispatcher-servlet.xml】
bean idpdfUrlViewController classcom.tom.springmvc.controller.file.PdfUrlViewController /【访问效果】
