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JavajavaTutorialIn-depth learning and construction of Spring+SpringMVC+MyBatis - SpringMVC entry program (2)
JavajavaTutorialIn-depth learning and construction of Spring+SpringMVC+MyBatis - SpringMVC entry program (2)In-depth learning and construction of Spring+SpringMVC+MyBatis - SpringMVC entry program (2)
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As mentioned earlier: Spring+SpringMVC+MyBatis in-depth learning and construction (12) - SpringMVC entry program (1)
1. Non-annotation Processor mappers and adapters
1.1 Non-annotated processor mapper
The org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping we configured earlier is a non-annotated processor mapper. In fact, a problem with this kind of mapper is that a url must be configured in a bean.
Now we configure another non-annotation mapper
org.springframework.web.servlet.handler.SimpleUrlHandlerMapping, which will configure the url and handler centrally.
<!-- 配置Handler --><bean></bean><!-- 配置处理器映射器
将bean的name作为url进行查找，需要在配置Handler时指定beanname（就是url）--><bean></bean><!-- 简单url映射
simpleUrlHandlerMapping是BeanNameUrlHandlerMapping的增强版，
它可以将url和处理器bean的id进行统一映射配置。 --> <bean><property><props><!-- 对ItemsController1进行url映射，url是/queryItems1.action --><prop>ItemsController1</prop><prop>ItemsController1</prop></props></property></bean>Question: Can these two mappers be configured at the same time?
Answer: Multiple mappers can coexist. The front-end controller determines which mappers the URL can map and lets the correct mapper handle it.
1.2 Non-annotated processor adapter
The org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter we configured earlier is a non-annotated adapter. It requires that the Handler you write must implement the Controller interface.
Let’s talk about another non-annotated adapter:
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter. It requires that the Handler written implements the HttpRequestHandler interface.
public class ItemsController2 implements HttpRequestHandler{
@Overridepublic void handleRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//调用service查找数据库，查询商品列表，这里使用静态数据模拟List<items> itemsList=new ArrayList<items>();
Items items_1=new Items();
items_1.setName("联想笔记本");
items_1.setPrice(6000f);
items_1.setDetail("ThinkPad T430 联想笔记本电脑！");
Items items_2 = new Items();
items_2.setName("苹果手机");
items_2.setPrice(5000f);
items_2.setDetail("iphone6苹果手机！");
itemsList.add(items_1);
itemsList.add(items_2);//设置模型数据request.setAttribute("itemsList", itemsList);//设置转发的视图request.getRequestDispatcher("/WEB-INF/jsp/items/itemsList.jsp").forward(request, response);
// 从上边可以看出此适配器器的handleRequest方法没有返回ModelAndView，可通过response修改定义响应内容，比如返回json数据：// response.setCharacterEncoding("utf-8");// response.setContentType("application/json;charset=utf-8");// response.getWriter().write("json串"); }
}</items></items>Configured in springmvc.xml:
<!--注解映射器 --><bean></bean><!--注解适配器 --><bean></bean><!--使用mvc:annotation-driven代替上边注解映射器和注解适配器 配置
mvc:annotation-driven默认加载很多的参数绑定方法，
比如json转换解析器就默认加载了，如果使用mvc:annotation-driven就不用配置上面的RequestMappingHandlerMapping和RequestMappingHandlerAdapter
实际开发时使用mvc:annotation-driven --><!-- <mvc:annotation-driven></mvc:annotation-driven> -->
3.2 Develop annotation HandlerUse annotated mappers and annotated adapters. (Annotated mappers and annotated adapters must be used in pairs. It is understood that non-annotated mappers cannot be used for mapping)
/**
* 开发注解Handler
* 使用@Controller标明它是一个控制器
* @author Joanna.Yan
*
*/@Controllerpublic class ItemsController3{ //商品查询列表//@RequestMapping实现对queryItems方法和url进行映射，一个方法对应一个url//一般建议将url和方法名写成一样，方便维护@RequestMapping("/queryItems")public ModelAndView queryItems() throws Exception{//调用service查找数据库，查询商品列表，这里使用静态数据模拟List<items> itemsList=new ArrayList<items>();
Items items_1=new Items();
items_1.setName("联想笔记本");
items_1.setPrice(6000f);
items_1.setDetail("ThinkPad T430 联想笔记本电脑！");
Items items_2 = new Items();
items_2.setName("苹果手机");
items_2.setPrice(5000f);
items_2.setDetail("iphone6苹果手机！");
itemsList.add(items_1);
itemsList.add(items_2);//返回ModelAndViewModelAndView modelAndView=new ModelAndView();
modelAndView.addObject("itemsList", itemsList);//指定视图modelAndView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");return modelAndView;
}//定义其它方法//商品添加//商品修改}</items></items>
3.3 Loading Handler in the spring container <!-- 对于注解的Handler可以单个配置
实际开发中建议使用组件扫描 --><!-- <bean class="joanna.yan.ssm.controller.ItemsController3" /> --><!-- 可以扫描controller、service、...
这里让扫描controller,指定controller的包 --><component-scan></component-scan>
Using the component scanner eliminates the tediousness of configuring each controller class in the spring container. Use Note: Single configuration during testing There is no problem with the annotated Handler running. When configuring the component scanner to run, an error message is reported when starting Tomcat:
##严重: Context initialization failed java.lang.IllegalArgumentException at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:52) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:101) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:76) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:298) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:230) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:153) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:130) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:285) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:223) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1258) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1918) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 六月 14, 2017 4:43:03 下午 org.apache.catalina.core.ApplicationContext log 严重: StandardWrapper.Throwable java.lang.IllegalArgumentException at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:52) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:101) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:76) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:298) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:230) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:153) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:130) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:285) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:223) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1258) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1918) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 六月 14, 2017 4:43:03 下午 org.apache.catalina.core.StandardContext loadOnStartup 严重: Servlet [springmvc] in web application [/SpringMVC] threw load() exception java.lang.IllegalArgumentException at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.asm.ClassReader.<init>(Unknown Source) at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:52) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80) at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:101) at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:76) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:298) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300) at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:230) at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:153) at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:130) at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:285) at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:223) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461) at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598) at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661) at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517) at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458) at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138) at javax.servlet.GenericServlet.init(GenericServlet.java:158) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5266) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5554) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1258) at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1918) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)</init></init></init></init></init></init></init></init></init></init></init></init>
View Code
原因是：我的Tomcat的jdk是1.8，项目的jdk版本是1.7，两者不一样造成的。记得要统一版本！
4.前端控制器源码分析
通过前端控制器源码分析springmvc的执行过程。
第一步：前端控制器接收请求
调用doDispatch
第二步：前端控制器调用处理器映射器查找Handler
第三步：调用处理器适配器执行Handler,得到执行结果ModeAndView
第四步：视图渲染，将model数据填充到request域。
视图解析，得到view:
调用view的渲染方法，将model数据填充到request域。
渲染方法：
5.视图解析器配置前缀和后缀
springmvc.xml中：
<!-- 配置视图解析器
解析jsp视图，默认使用jstl标签，所有classpath下得有jstl的包--><bean><!--配置jsp路径的前缀 --><property></property><!--配置jsp路径的后缀 --><property></property></bean>程序中不用指定前缀和后缀：
//指定视图// modelAndView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");//下边的路径，如果在视图解析器中配置jsp路径的前缀和jsp路径的后缀，修改为modelAndView.setViewName("items/itemsList");The above is the detailed content of In-depth learning and construction of Spring+SpringMVC+MyBatis - SpringMVC entry program (2). For more information, please follow other related articles on the PHP Chinese website!
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