本文节选自《Spring 5外围原理》
接下来咱们来实现MVC模块的性能,应该不须要再做阐明。Spring MVC的入口就是从DispatcherServlet开始的,而后面的章节中已实现了web.xml的根底配置。上面就从DispatcherServlet开始添砖加瓦。
1 MVC顶层设计
1.1 GPDispatcherServlet
咱们曾经理解到Servlet的生命周期由init()到service()再到destory()组成,destory()办法咱们不做实现。后面咱们讲过,这是J2EE中模板模式的典型利用。上面先定义好全局变量:
package com.tom.spring.formework.webmvc.servlet;import com.tom.spring.formework.annotation.GPController;import com.tom.spring.formework.annotation.GPRequestMapping;import com.tom.spring.formework.context.GPApplicationContext;import com.tom.spring.formework.webmvc.*;import lombok.extern.slf4j.Slf4j;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.File;import java.io.IOException;import java.lang.reflect.Method;import java.util.*;import java.util.regex.Matcher;import java.util.regex.Pattern;//Servlet只是作为一个MVC的启动入口@Slf4jpublic class GPDispatcherServlet extends HttpServlet { private final String LOCATION = "contextConfigLocation"; //读者能够思考一下这样设计的经典之处 //GPHandlerMapping最外围的设计,也是最经典的 //它间接干掉了Struts、Webwork等MVC框架 private List<GPHandlerMapping> handlerMappings = new ArrayList<GPHandlerMapping>(); private Map<GPHandlerMapping,GPHandlerAdapter> handlerAdapters = new HashMap<GPHandlerMapping, GPHandlerAdapter>(); private List<GPViewResolver> viewResolvers = new ArrayList<GPViewResolver>(); private GPApplicationContext context;}上面实现init()办法,咱们次要实现IoC容器的初始化和Spring MVC九大组件的初始化。 @Override public void init(ServletConfig config) throws ServletException { //相当于把IoC容器初始化了 context = new GPApplicationContext(config.getInitParameter(LOCATION)); initStrategies(context); } protected void initStrategies(GPApplicationContext context) { //有九种策略 //针对每个用户申请,都会通过一些解决策略解决,最终能力有后果输入 //每种策略能够自定义干涉,然而最终的后果都统一 // ============= 这里说的就是传说中的九大组件 ================ initMultipartResolver(context);//文件上传解析,如果申请类型是multipart,将通过MultipartResolver进行文件上传解析 initLocaleResolver(context);//本地化解析 initThemeResolver(context);//主题解析 /** 咱们本人会实现 */ //GPHandlerMapping 用来保留Controller中配置的RequestMapping和Method的对应关系 initHandlerMappings(context);//通过HandlerMapping将申请映射到处理器 /** 咱们本人会实现 */ //HandlerAdapters 用来动静匹配Method参数,包含类转换、动静赋值 initHandlerAdapters(context);//通过HandlerAdapter进行多类型的参数动静匹配 initHandlerExceptionResolvers(context);//如果执行过程中遇到异样,将交给HandlerExceptionResolver来解析 initRequestToViewNameTranslator(context);//间接将申请解析到视图名 /** 咱们本人会实现 */ //通过ViewResolvers实现动静模板的解析 //本人解析一套模板语言 initViewResolvers(context);//通过viewResolver将逻辑视图解析到具体视图实现 initFlashMapManager(context);//Flash映射管理器 } private void initFlashMapManager(GPApplicationContext context) {} private void initRequestToViewNameTranslator(GPApplicationContext context) {} private void initHandlerExceptionResolvers(GPApplicationContext context) {} private void initThemeResolver(GPApplicationContext context) {} private void initLocaleResolver(GPApplicationContext context) {} private void initMultipartResolver(GPApplicationContext context) {} //将Controller中配置的RequestMapping和Method进行一一对应 private void initHandlerMappings(GPApplicationContext context) { //依照咱们通常的了解应该是一个Map //Map<String,Method> map; //map.put(url,Method) //首先从容器中获取所有的实例 String [] beanNames = context.getBeanDefinitionNames(); try { for (String beanName : beanNames) { //到了MVC层,对外提供的办法只有一个getBean()办法 //返回的对象不是BeanWrapper,怎么办? Object controller = context.getBean(beanName); //Object controller = GPAopUtils.getTargetObject(proxy); Class<?> clazz = controller.getClass(); if (!clazz.isAnnotationPresent(GPController.class)) { continue; } String baseUrl = ""; if (clazz.isAnnotationPresent(GPRequestMapping.class)) { GPRequestMapping requestMapping = clazz.getAnnotation(GPRequestMapping.class); baseUrl = requestMapping.value(); } //扫描所有的public类型的办法 Method[] methods = clazz.getMethods(); for (Method method : methods) { if (!method.isAnnotationPresent(GPRequestMapping.class)) { continue; } GPRequestMapping requestMapping = method.getAnnotation(GPRequestMapping.class); String regex = ("/" + baseUrl + requestMapping.value().replaceAll("\\*", ".*")).replaceAll("/+", "/"); Pattern pattern = Pattern.compile(regex); this.handlerMappings.add(new GPHandlerMapping(pattern, controller, method)); log.info("Mapping: " + regex + " , " + method); } } }catch (Exception e){ e.printStackTrace(); } } private void initHandlerAdapters(GPApplicationContext context) { //在初始化阶段,咱们能做的就是,将这些参数的名字或者类型按肯定的程序保留下来 //因为前面用反射调用的时候,传的形参是一个数组 //能够通过记录这些参数的地位index,一一从数组中取值,这样就和参数的程序无关了 for (GPHandlerMapping handlerMapping : this.handlerMappings){ //每个办法有一个参数列表,这里保留的是形参列表 this.handlerAdapters.put(handlerMapping,new GPHandlerAdapter()); } } private void initViewResolvers(GPApplicationContext context) { //在页面中输出http://localhost/first.html //解决页面名字和模板文件关联的问题 String templateRoot = context.getConfig().getProperty("templateRoot"); String templateRootPath = this.getClass().getClassLoader().getResource (templateRoot).getFile(); File templateRootDir = new File(templateRootPath); for (File template : templateRootDir.listFiles()) { this.viewResolvers.add(new GPViewResolver(templateRoot)); } }
在下面的代码中,咱们只实现了九大组件中的三大外围组件的基本功能,别离是HandlerMapping、HandlerAdapter、ViewResolver,实现MVC最外围的调度性能。其中HandlerMapping就是策略模式的利用,用输出URL间接调用不同的Method已达到获取后果的目标。顾名思义,HandlerAdapter利用的是适配器模式,将Request的字符型参数主动适配为Method的Java实参,次要实现参数列表主动适配和类型转换性能。ViewResolver也算一种策略,依据不同的申请抉择不同的模板引擎来进行页面的渲染。
接下来看service()办法,它次要负责接管申请,失去Request和Response对象。在Servlet子类中service()办法被拆分成doGet()办法和doPost()办法。咱们在doGet()办法中间接调用doPost()办法,在doPost()办法中调用doDispatch()办法,真正的调用逻辑由doDispatch()来执行。
@Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { this.doPost(req,resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { doDispatch(req, resp); }catch (Exception e){ resp.getWriter().write("<font size='25' color='blue'>500 Exception</font><br/>Details: <br/>" + Arrays.toString(e.getStackTrace()).replaceAll("\\[|\\]","") .replaceAll("\\s","\r\n") + "<font color='green'><i>Copyright@GupaoEDU </i></font>"); e.printStackTrace(); } } private void doDispatch(HttpServletRequest req, HttpServletResponse resp) throws Exception{ //依据用户申请的URL来取得一个Handler GPHandlerMapping handler = getHandler(req); if(handler == null){ processDispatchResult(req,resp,new GPModelAndView("404")); return; } GPHandlerAdapter ha = getHandlerAdapter(handler); //这一步只是调用办法,失去返回值 GPModelAndView mv = ha.handle(req, resp, handler); //这一步才是真的输入 processDispatchResult(req,resp, mv); } private void processDispatchResult(HttpServletRequest request,HttpServletResponse response, GPModelAndView mv) throws Exception { //调用viewResolver的resolveViewName()办法 if(null == mv){ return;} if(this.viewResolvers.isEmpty()){ return;} if (this.viewResolvers != null) { for (GPViewResolver viewResolver : this.viewResolvers) { GPView view = viewResolver.resolveViewName(mv.getViewName(), null); if (view != null) { view.render(mv.getModel(),request,response); return; } } } } private GPHandlerAdapter getHandlerAdapter(GPHandlerMapping handler) { if(this.handlerAdapters.isEmpty()){return null;} GPHandlerAdapter ha = this.handlerAdapters.get(handler); if (ha.supports(handler)) { return ha; } return null; } private GPHandlerMapping getHandler(HttpServletRequest req) { if(this.handlerMappings.isEmpty()){ return null;} String url = req.getRequestURI(); String contextPath = req.getContextPath(); url = url.replace(contextPath,"").replaceAll("/+","/"); for (GPHandlerMapping handler : this.handlerMappings) { Matcher matcher = handler.getPattern().matcher(url); if(!matcher.matches()){ continue;} return handler; } return null;}
GPDisptcherServlet的残缺代码请关注微信公众号回复“Spring”。上面补充实现下面的代码中缺失的依赖类。
1.2 GPHandlerMapping
咱们曾经晓得HandlerMapping次要用来保留URL和Method的对应关系,这里其实应用的是策略模式。
package com.tom.spring.formework.webmvc;import java.lang.reflect.Method;import java.util.regex.Pattern;public class GPHandlerMapping { private Object controller; //指标办法所在的contrller对象 private Method method; //URL对应的指标办法 private Pattern pattern; //URL的封装 public GPHandlerMapping(Pattern pattern,Object controller, Method method) { this.controller = controller; this.method = method; this.pattern = pattern; } public Object getController() { return controller; } public void setController(Object controller) { this.controller = controller; } public Method getMethod() { return method; } public void setMethod(Method method) { this.method = method; } public Pattern getPattern() { return pattern; } public void setPattern(Pattern pattern) { this.pattern = pattern; }}
1.3 GPHandlerAdapter
原生Spring的HandlerAdapter次要实现申请传递到服务端的参数列表与Method实参列表的对应关系,实现参数值的类型转换工作。外围办法是handle(),在handle()办法中用反射来调用被适配的指标办法,并将转换包装好的参数列表传递过来。
package com.tom.spring.formework.webmvc;import com.tom.spring.formework.annotation.GPRequestParam;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.lang.annotation.Annotation;import java.util.Arrays;import java.util.HashMap;import java.util.Map;//专人干专事public class GPHandlerAdapter { public boolean supports(Object handler){ return (handler instanceof GPHandlerMapping); } public GPModelAndView handle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception{ GPHandlerMapping handlerMapping = (GPHandlerMapping)handler; //每个办法有一个参数列表,这里保留的是形参列表 Map<String,Integer> paramMapping = new HashMap<String, Integer>(); //这里只是给出命名参数 Annotation[][] pa = handlerMapping.getMethod().getParameterAnnotations(); for (int i = 0; i < pa.length ; i ++) { for (Annotation a : pa[i]) { if(a instanceof GPRequestParam){ String paramName = ((GPRequestParam) a).value(); if(!"".equals(paramName.trim())){ paramMapping.put(paramName,i); } } } } //依据用户申请的参数信息,跟Method中的参数信息进行动静匹配 //resp 传进来的目标只有一个:将其赋值给办法参数,仅此而已 //只有当用户传过来的ModelAndView为空的时候,才会新建一个默认的 //1. 要筹备好这个办法的形参列表 //办法重载时形参的决定因素:参数的个数、参数的类型、参数程序、办法的名字 //只解决Request和Response Class<?>[] paramTypes = handlerMapping.getMethod().getParameterTypes(); for (int i = 0;i < paramTypes.length; i ++) { Class<?> type = paramTypes[i]; if(type == HttpServletRequest.class || type == HttpServletResponse.class){ paramMapping.put(type.getName(),i); } } //2. 失去自定义命名参数所在的地位 //用户通过URL传过来的参数列表 Map<String,String[]> reqParameterMap = req.getParameterMap(); //3. 结构实参列表 Object [] paramValues = new Object[paramTypes.length]; for (Map.Entry<String,String[]> param : reqParameterMap.entrySet()) { String value = Arrays.toString(param.getValue()).replaceAll("\\[|\\]",""). replaceAll("\\s",""); if(!paramMapping.containsKey(param.getKey())){continue;} int index = paramMapping.get(param.getKey()); //因为页面传过来的值都是String类型的,而在办法中定义的类型是变幻无穷的 //所以要针对咱们传过来的参数进行类型转换 paramValues[index] = caseStringValue(value,paramTypes[index]); } if(paramMapping.containsKey(HttpServletRequest.class.getName())) { int reqIndex = paramMapping.get(HttpServletRequest.class.getName()); paramValues[reqIndex] = req; } if(paramMapping.containsKey(HttpServletResponse.class.getName())) { int respIndex = paramMapping.get(HttpServletResponse.class.getName()); paramValues[respIndex] = resp; } //4. 从handler中取出Controller、Method,而后利用反射机制进行调用 Object result = handlerMapping.getMethod().invoke(handlerMapping.getController(), paramValues); if(result == null){ return null; } boolean isModelAndView = handlerMapping.getMethod().getReturnType() == GPModelAndView.class; if(isModelAndView){ return (GPModelAndView)result; }else{ return null; } } private Object caseStringValue(String value,Class<?> clazz){ if(clazz == String.class){ return value; }else if(clazz == Integer.class){ return Integer.valueOf(value); }else if(clazz == int.class){ return Integer.valueOf(value).intValue(); }else { return null; } }}
1.4 GPModelAndView
原生Spring中ModelAndView类次要用于封装页面模板和要往页面传送的参数的对应关系。
package com.tom.spring.formework.webmvc;import java.util.Map;public class GPModelAndView { private String viewName; //页面模板的名称 private Map<String,?> model; //往页面传送的参数 public GPModelAndView(String viewName) { this(viewName,null); } public GPModelAndView(String viewName, Map<String, ?> model) { this.viewName = viewName; this.model = model; } public String getViewName() { return viewName; } public void setViewName(String viewName) { this.viewName = viewName; } public Map<String, ?> getModel() { return model; } public void setModel(Map<String, ?> model) { this.model = model; }}
1.5 GPViewResolver
原生Spring中的ViewResolver次要实现模板名称和模板解析引擎的匹配。通过在Serlvet中调用resolveViewName()办法来取得模板所对应的View。在这个Mini版本中简化了实现,只实现了一套默认的模板引擎,语法也是齐全自定义的。
package com.tom.spring.formework.webmvc;import java.io.File;import java.util.Locale;//设计这个类的次要目标是://1. 将一个动态文件变为一个动静文件//2. 依据用户传送不同的参数,产生不同的后果//最终输入字符串,交给Response输入public class GPViewResolver { private final String DEFAULT_TEMPLATE_SUFFIX = ".html"; private File templateRootDir; private String viewName; public GPViewResolver(String templateRoot){ String templateRootPath = this.getClass().getClassLoader().getResource(templateRoot). getFile(); this.templateRootDir = new File(templateRootPath); } public GPView resolveViewName(String viewName, Locale locale) throws Exception { this.viewName = viewName; if(null == viewName || "".equals(viewName.trim())){ return null;} viewName = viewName.endsWith(DEFAULT_TEMPLATE_SUFFIX) ? viewName : (viewName + DEFAULT_TEMPLATE_SUFFIX); File templateFile = new File((templateRootDir.getPath() + "/" + viewName).replaceAll ("/+", "/")); return new GPView(templateFile); } public String getViewName() { return viewName; }}
1.6 GPView
这里的GPView就是后面所说的自定义模板解析引擎,其外围办法是render()。在render()办法中实现对模板的渲染,最终返回浏览器能辨认的字符串,通过Response输入。
package com.tom.spring.formework.webmvc;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.RandomAccessFile;import java.util.Map;import java.io.File;import java.util.regex.Matcher;import java.util.regex.Pattern;public class GPView { public static final String DEFAULT_CONTENT_TYPE = "text/html;charset=utf-8"; private File viewFile; public GPView(File viewFile){ this.viewFile = viewFile; } public String getContentType(){ return DEFAULT_CONTENT_TYPE; } public void render(Map<String, ?> model,HttpServletRequest request, HttpServletResponse response) throws Exception{ StringBuffer sb = new StringBuffer(); RandomAccessFile ra = new RandomAccessFile(this.viewFile,"r"); try { String line = null; while (null != (line = ra.readLine())) { line = new String(line.getBytes("ISO-8859-1"),"utf-8"); Pattern pattern = Pattern.compile("¥\\{[^\\}]+\\}",Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(line); while (matcher.find()) { String paramName = matcher.group(); paramName = paramName.replaceAll("¥\\{|\\}",""); Object paramValue = model.get(paramName); if (null == paramValue) { continue; } //要把¥{}两头的这个字符串取出来 line = matcher.replaceFirst(makeStringForRegExp(paramValue.toString())); matcher = pattern.matcher(line); } sb.append(line); } }finally { ra.close(); } response.setCharacterEncoding("utf-8"); //response.setContentType(DEFAULT_CONTENT_TYPE); response.getWriter().write(sb.toString()); } //解决特殊字符 public static String makeStringForRegExp(String str) { return str.replace("\\", "\\\\").replace("*", "\\*") .replace("+", "\\+").replace("|", "\\|") .replace("{", "\\{").replace("}", "\\}") .replace("(", "\\(").replace(")", "\\)") .replace("^", "\\^").replace("$", "\\$") .replace("[", "\\[").replace("]", "\\]") .replace("?", "\\?").replace(",", "\\,") .replace(".", "\\.").replace("&", "\\&"); }}
从下面的代码能够看出,GPView是基于HTML文件来对页面进行渲染的。然而退出了一些自定义语法,例如在模板页面中扫描到¥{name}这样的表达式,就会从ModelAndView的Model中找到name所对应的值,并且用正则表达式将其替换(外国人喜爱用美元符号$,咱们的模板引擎就用人民币符号¥)。
2 业务代码实现
2.1 IQueryService
定义一个负责查问业务的顶层接口IQueryService,提供一个query()办法:
package com.tom.spring.demo.service;/** * 查问业务 * */public interface IQueryService { /** * 查问 */ public String query(String name); }
2.2 QueryService
查问业务的实现QueryService也非常简单,就是打印一下调用工夫和传入的参数,并封装为JSON格局返回:
package com.tom.spring.demo.service.impl;import java.text.SimpleDateFormat;import java.util.Date;import com.tom.spring.demo.service.IQueryService;import com.tom.spring.formework.annotation.GPService;import lombok.extern.slf4j.Slf4j;/** * 查问业务 * */@GPService@Slf4jpublic class QueryService implements IQueryService { /** * 查问 */ public String query(String name) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String time = sdf.format(new Date()); String json = "{name:\"" + name + "\",time:\"" + time + "\"}"; log.info("这是在业务办法中打印的:" + json); return json; }}
2.3 IModifyService
定义一个增、删、改业务的顶层接口IModifyService:
package com.tom.spring.demo.service;/** * 增、删、改业务 */public interface IModifyService { /** * 减少 */ public String add(String name, String addr) ; /** * 批改 */ public String edit(Integer id, String name); /** * 删除 */ public String remove(Integer id); }
2.4 ModifyService
增、删、改业务的实现ModifyService也非常简单,次要是打印传过来的参数:
package com.tom.spring.demo.service.impl;import com.tom.spring.demo.service.IModifyService;import com.tom.spring.formework.annotation.GPService;/** * 增、删、改业务 */@GPServicepublic class ModifyService implements IModifyService { /** * 减少 */ public String add(String name,String addr) { return "modifyService add,name=" + name + ",addr=" + addr; } /** * 批改 */ public String edit(Integer id,String name) { return "modifyService edit,id=" + id + ",name=" + name; } /** * 删除 */ public String remove(Integer id) { return "modifyService id=" + id; }}
2.5 MyAction
Controller的次要性能是负责调度,不做业务实现。业务实现办法全副在Service层,个别咱们会将Service实例注入Controller。MyAction中次要实现对IQueryService和IModifyService的调度,对立返回后果:
package com.tom.spring.demo.action;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.tom.spring.demo.service.IModifyService;import com.tom.spring.demo.service.IQueryService;import com.tom.spring.formework.annotation.GPAutowired;import com.tom.spring.formework.annotation.GPController;import com.tom.spring.formework.annotation.GPRequestMapping;import com.tom.spring.formework.annotation.GPRequestParam;import com.tom.spring.formework.webmvc.GPModelAndView;/** * 颁布接口URL */@GPController@GPRequestMapping("/web")public class MyAction { @GPAutowired IQueryService queryService; @GPAutowired IModifyService modifyService; @GPRequestMapping("/query.json") public GPModelAndView query(HttpServletRequest request, HttpServletResponse response, @GPRequestParam("name") String name){ String result = queryService.query(name); return out(response,result); } @GPRequestMapping("/add*.json") public GPModelAndView add(HttpServletRequest request,HttpServletResponse response, @GPRequestParam("name") String name,@GPRequestParam("addr") String addr){ String result = modifyService.add(name,addr); return out(response,result); } @GPRequestMapping("/remove.json") public GPModelAndView remove(HttpServletRequest request,HttpServletResponse response, @GPRequestParam("id") Integer id){ String result = modifyService.remove(id); return out(response,result); } @GPRequestMapping("/edit.json") public GPModelAndView edit(HttpServletRequest request,HttpServletResponse response, @GPRequestParam("id") Integer id, @GPRequestParam("name") String name){ String result = modifyService.edit(id,name); return out(response,result); } private GPModelAndView out(HttpServletResponse resp,String str){ try { resp.getWriter().write(str); } catch (IOException e) { e.printStackTrace(); } return null; }}
2.6 PageAction
专门设计PageAction是为了演示Mini版Spring对模板引擎的反对,实现从Controller层到View层的传参,以及对模板的渲染进行最终输入:
package com.tom.spring.demo.action;import java.util.HashMap;import java.util.Map;import com.tom.spring.demo.service.IQueryService;import com.tom.spring.formework.annotation.GPAutowired;import com.tom.spring.formework.annotation.GPController;import com.tom.spring.formework.annotation.GPRequestMapping;import com.tom.spring.formework.annotation.GPRequestParam;import com.tom.spring.formework.webmvc.GPModelAndView;/** * 颁布接口URL */@GPController@GPRequestMapping("/")public class PageAction { @GPAutowired IQueryService queryService; @GPRequestMapping("/first.html") public GPModelAndView query(@GPRequestParam("teacher") String teacher){ String result = queryService.query(teacher); Map<String,Object> model = new HashMap<String,Object>(); model.put("teacher", teacher); model.put("data", result); model.put("token", "123456"); return new GPModelAndView("first.html",model); }}
3 定制模板页面
为了更全面地演示页面渲染成果,别离定义了first.html对应PageAction中的first.html申请、404.html默认页和500.html异样默认页。
3.1 first.html
first.html定义如下:
<!DOCTYPE html><html lang="zh-cn"><head> <meta charset="utf-8"> <title>SpringMVC模板引擎演示</title></head><center> <h1>大家好,我是¥{teacher}老师<br/>欢送大家一起来摸索Spring的世界</h1> <h3>Hello,My name is ¥{teacher}</h3> <div>¥{data}</div> Token值:¥{token}</center></html>
3.2 404.html
404.html定义如下:
<!DOCTYPE html><html lang="zh-cn"><head> <meta charset="utf-8"> <title>页面去火星了</title></head><body> <font size='25' color='red'>404 Not Found</font><br/><font color='green'><i>Copyright @GupaoEDU</i></font></body></html>
3.3 500.html
500.html定义如下:
<!DOCTYPE html><html lang="zh-cn"><head> <meta charset="utf-8"> <title>服务器如同累了</title></head><body> <font size='25' color='blue'>500 服务器如同有点累了,须要劳动一下</font><br/> <b>Message:¥{detail}</b><br/> <b>StackTrace:¥{stackTrace}</b><br/> <font color='green'><i>Copyright@GupaoEDU</i></font></body></html>
4 运行成果演示
在浏览器中输出 http://localhost/web/query.js... ,就会映射到MyAction中的@GPRequestMapping(“query.json”)对应的query()办法,失去如下图所示后果。
在浏览器中输出 http://localhost/web/addTom.j... ,就会映射到MyAction中的@GPRequestMapping(“add*.json”)对应的add()办法,失去如下图所示后果。
在浏览器中输出 http://localhost/web/remove.j... ,就会映射到MyAction中的@GPRequestMapping(“remove.json”)对应的remove()办法,并将id主动转换为int类型,失去如下图所示后果。
在浏览器中输出 http://localhost/web/edit.jso... ,就会映射到MyAction中的@GPRequestMapping(“edit.json”)对应的edit()办法,并将id主动转换为int类型,失去如下图所示后果。
在浏览器中输出 http://localhost/first.html?t... ,就会映射到PageAction中的@GPRequestMapping(“first.html”)对应的query()办法,失去如下图所示后果。
到这里,曾经实现了Spring从IoC、ID到MVC的残缺性能。尽管疏忽了一些细节,然而咱们曾经理解到,Spring的外围设计思维其实并没有咱们设想得那么神秘。咱们曾经奇妙地用到了工厂模式、动态代理模式、适配器模式、模板模式、策略模式、委派模式等,使得代码变得十分优雅。
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