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springmvc记录(三种处理器映射器、两种处理器适配器、注解开发、参数绑定、处理json、多视图支持)

录:

1、mvc和springmvc介绍
2、Springmvc执行流程
3、springmvc入门程序
4、三种处理器映射器
5、2种处理器适配器
6、命令控制器
7、中文乱码解决
8、时间类型转换
9、注解开发
10、转发和重定向
11、RequestBody/ ResponseBody处理Json数据
12、参数绑定
13、springmvc多视图支持

1、mvc和springmvc介绍    <--返回目录

1.1、JAVAEE体系结构

 

1.2、mvc设计模式

  model 1

   model 2

 

 1.3、Springmvc是什么

  Springmvc是一个web层mvc框架,类似struts2。Springmvc是spring的一部分

 

2、Springmvc执行流程    <--返回目录

  具体流程步骤如下:

1、首先用户发送请求——>DispatcherServlet,前端控制器收到请求后自己不进行处理,而是委托给其他的解析器进行处理,作为统一访问点,进行全局的流程控制;
2、DispatcherServlet——>HandlerMapping,HandlerMapping将会把请求映射为HandlerExecutionChain对象(包含一个Handler处理器(页面控制器)对象、
多个HandlerInterceptor拦截器)对象,通过这种策略模式,很容易添加新的映射策略;
3、DispatcherServlet——>HandlerAdapter,HandlerAdapter将会把处理器包装为适配器,从而支持多种类型的处理器,即适配器设计模式的应用,
从而很容易支持很多类型的处理器;
4、HandlerAdapter——>处理器功能处理方法的调用,HandlerAdapter将会根据适配的结果调用真正的处理器的功能处理方法,完成功能处理;
并返回一个ModelAndView对象(包含模型数据、逻辑视图名);
5、ModelAndView的逻辑视图名——> ViewResolver, ViewResolver将把逻辑视图名解析为具体的View,通过这种策略模式,很容易更换其他视图技术; 6、View——>渲染,View会根据传进来的Model模型数据进行渲染,此处的Model实际是一个Map数据结构,因此很容易支持其他视图技术; 7、返回控制权给DispatcherServlet,由DispatcherServlet返回响应给用户,到此一个流程结束。

 

3、springmvc入门程序    <--返回目录

3.1、新建一个 Dynamic Web Project

3.2、项目结构

 

3.3、导入jar

 

 3.4、代码

   web.xm配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>helloworld</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
    <!-- post请求编码过滤器 -->
    <filter>
        <filter-name>characterEncoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
  
    <!-- 前端控制器DispatcherServlet -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 默认加载方式
           默认加载必须规范:
           * 文件命名:servlet-name-servlet.xml====springmvc-servlet.xml
           * 路径规范:必须在WEB-INF目录下面  -->
        <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>classpath:springmvc.xml</param-value>   
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
</web-app>

  另外,前端控制器添加 <load-on-startup>2</load-on-startup>使得前端控制器在服务器启动就初始化。

  此处需要特别强调的是 <url-pattern>/</url-pattern>也可以使用/,但不能使用/*。如果使用/*,那么请求时可以通过DispatcherServlet转发到相应的Action或者Controller中的,但是返回的内容,如返回的jsp还会再次被拦截,这样导致404错误,即访问不到jsp。所以如果以后发现总是有404错误的时候,别忘了check一下 <url-pattern>/</url-pattern>的配置是否是/*.

  springmvc.xml 配置三大组件:处理器映射器、处理器适配器、视图解析器

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
        
    <!-- 配置处理器映射器,springmvc默认的处理器映射器
         BeanNameUrlHandlerMapping:根据bean(自定义Controler)的name属性的url去寻找hanler(Controller)
     -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
        
    <!-- 配置处理器适配器执行Controlelr ,springmvc默认的
         SimpleControllerHandlerAdapter:执行Controller
    -->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    
    <!-- 配置自定义Controler -->
    <bean id="myController" name="/hello.do" class="com.oy.controller.MyController"></bean>
    
    <!-- 配置sprigmvc视图解析器:解析逻辑试图 
          后台返回逻辑试图:index
         视图解析器解析出真正物理视图:前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp
    -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsps/"></property>
        <property name="suffix" value=".jsp"></property>        
    </bean>
</beans>

  hello.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>主页</title>
</head>
<body>
<h2>hello页面</h2><br/>
${msg}
</body>
</html>
View Code

  MyController

package com.oy.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

public class MyController implements Controller {

    @Override
    public ModelAndView handleRequest(HttpServletRequest req, HttpServletResponse res) throws Exception {
        //接受请求,接受参数,验证参数
        //封装参数,调用业务方法
        //返回视图
        ModelAndView mv = new ModelAndView();
        //设置页面回显数据
        mv.addObject("msg", "欢迎学习springmvc!");
        
        //指定跳转的视图
        //返回物理视图
        //mv.setViewName("/WEB-INF/jsps/hello.jsp");
        //返回逻辑视图
        mv.setViewName("hello");
        return mv;
    }
    
}

 

3.5、测试

  根据web.xml 欢迎页配置

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

  当访问:http://localhost:8080/helloworld/时,访问项目根路径下的index.jsp

   当访问 http://localhost:8080/helloworld/hello.do,通过配置的BeanNameUrlHandlerMapping,根据bean(自定义Controler)的name属性的url去寻找hanler

 

4、三种处理器映射器    <--返回目录

  BeanNameUrlHandlerMapping

 

   SimpleUrlHandlerMaping:功能寻找Controller。根据浏览器url匹配简单url的key,key又Controller的id找到Controller。

 

  ControllerClassNameHandlerMapping:功能寻找Controller。根据类名(MyController)类名.do来访问,类名首字母小写。

   映射器之间能不能共存?
  3个处理器映射器可以共存。

5、2种处理器适配器    <--返回目录

  SimpleControllerHandlerAdapter:功能执行controller,调用controller里面方法,返回modelAndView。

   HttpRequestHandlerAdapter

   2个处理器适配器能共存?
  可以共存

6、命令控制器    <--返回目录

  Springmvc通过命令设计模式接受页面参数。

  自定义命令控制器

   自定义javabean

   封装页面参数

   跳转到add页面:由于add页面在WEB-INF下面不能直接访问,需要通过Controller来访问。

   在springmvc.xml配置bean

 

7、中文乱码解决    <--返回目录

解决Url带中文参数乱码问题(get请求)
    1)配置tomcat的server.xml文件,发布项目的时候可以配置
        <!-- 处理中文乱码 URIEncoding="UTF-8"
        <Connector URIEncoding="UTF-8" connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443"/>
        -->
    2)开发阶段,配置eclipse下的servers/Tomcat v7.0 Server at localhost-config/server.xml
        事实上,在eclipse下修改的会同步到使用的tomcat服务器。

  get请求乱码解决

 

  post请求乱码解决

  在web.xml配置

<!-- post请求编码过滤器 -->
<filter>
    <filter-name>characterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>characterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

 

8、时间类型转换    <--返回目录

public class CommandController extends AbstractCommandController{
    
    //指定参数绑定到那个javaBean
    public CommandController(){
        this.setCommandClass(User.class);
    }

    @Override
    protected ModelAndView handle(HttpServletRequest request,
            HttpServletResponse response, Object command, BindException errors)
            throws Exception {
        //把命令对象强转成User对象
        User user = (User) command;
        ModelAndView mv = new ModelAndView();
        
        mv.addObject("user", user);
        
        mv.setViewName("index");
        
        return mv;
    }
    
    @Override
    protected void initBinder(HttpServletRequest request,
            ServletRequestDataBinder binder) throws Exception {
        
        String str = request.getParameter("birthday");
        if(str.contains("/")){
            binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy/MM/dd"), true));
        }else{
            binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));    
        }
        
    }

}

 

9、注解开发    <--返回目录

9.1、搭建项目

  jdk1.7+tomcat8.5。

  搭建项目出现:org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class

20:22:19,028 DEBUG PathMatchingResourcePatternResolver:351 - Resolved location pattern [classpath*:com/oy/**/*.class] to resources [file [D:\oy_workspace\eclipse_javaee_win64_workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\helloworld\WEB-INF\classes\com\oy\controller\UserController.class]]
20:22:19,043 ERROR DispatcherServlet:466 - Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\oy_workspace\eclipse_javaee_win64_workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\helloworld\WEB-INF\classes\com\oy\controller\UserController.class]; nested exception is java.lang.IllegalArgumentException
    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:281)
    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:242)
    at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:84)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:73)
    

  

  由于之前使用的jdk1.8+tomcat9,现在改为jdk1.7+tomcat8.5。

  eclipse添加一个tomcat server

 

   将项目添加进tomca提示Project facet Java version 1.8 is not supported.

 

  首先改变项目jdk

 

  然后修改项目Java Compiler 和 project facet, 选中项目右键-->Properties-->Java Compiler 或 Project Facets

 

 

9.2、项目结构和jar包

 

 

9.3、代码

  web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>helloworld</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
    <!-- post请求编码过滤器 -->
    <filter>
        <filter-name>characterEncoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!-- 前端控制器DispatcherServlet -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 默认加载方式
           默认加载必须规范:
           * 文件命名:servlet-name-servlet.xml====springmvc-servlet.xml
           * 路径规范:必须在WEB-INF目录下面  -->
        <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>classpath:springmvc.xml</param-value>   
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    
</web-app>

  springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
        
    <context:component-scan base-package="com.oy"></context:component-scan>
        
    <!-- 配置注解处理器映射器 
        功能:寻找执行类Controller -->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
        
    <!-- 配置注解处理器适配器 
        功能:调用controller方法,执行controller -->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>

    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    <!-- 配置sprigmvc视图解析器:解析逻辑试图 
          后台返回逻辑试图:index
         视图解析器解析出真正物理视图:前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp
    -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsps/"></property>
        <property name="suffix" value=".jsp"></property>        
    </bean>
</beans>

  log4j.properties

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=debug, stdout
View Code

  UserController

package com.oy.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping(value="/hello.do",method={RequestMethod.GET,RequestMethod.POST})
    public String hello(){
        return "hello";
    }
}

  

9.4、测试

  http://localhost:8080/helloworld/user/hello.do

 

10、转发和重定向    <--返回目录

10.1、重定向Redirect

Contrller方法返回结果重定向到一个url地址,如果方式:
return "redirect:/user/userlist.do";
注意:
•    redirect:add.do 与 redirect:/user/add.do" 同一个类
      在同一个类里面进行跳转。上面2个都可以实现跳转。但是有区别:
      第一个是同一个根路径下面跳转。第二个是在项目路径下进行跳转。
•    不同的类进行跳转
不同的类进行跳转只能使用:redirect:/user/add.do进行跳转。即是从项目路径下来查询。
redirect方式相当于“response.sendRedirect()”,转发后浏览器的地址栏变为转发后的地址,因为转发即执行了一个新的request和response。
由于新发起一个request原来的参数在转发时就不能传递到下一个url,如果要传参数可以/user/userlist.do后边加参数,如下:
/user/userlist.action?groupid=2&...

10.2、转发Forward

controller方法执行后继续执行另一个controller方法。
return "forward:/user/userlist.action";
forward方式相当于“request.getRequestDispatcher().forward(request,response)”,转发后浏览器地址栏还是原来的地址。转发并没有执行新的request和response,而是和转发前的请求共用一个request和response。所以转发前请求的参数在转发后仍然可以读取到。

11、RequestBody/ ResponseBody处理Json数据    <--返回目录

  @RequestBody注解用于读取http请求的内容(字符串),通过springmvc提供的HttpMessageConverter接口将读到的内容转换为json、xml等格式的数据并绑定到controller方法的参数上。

  添加处理json数据配置(测试时配置下面的json转换器仍然报415)

<!-- 注解适配器 :添加json转换器-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
  <property name="messageConverters">
    <list>
      <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
    </list>
  </property>
</bean>
23:27:15,966 DEBUG DispatcherServlet:823 - DispatcherServlet with name 'springmvc' processing POST request for [/helloworld/json1.do]
23:27:15,970 DEBUG RequestMappingHandlerMapping:209 - Looking up handler method for path /json1.do
23:27:15,973 DEBUG RequestMappingHandlerMapping:216 - Returning handler method [public com.oy.controller.User com.oy.controller.MyJsonController.requestJson(org.springframework.ui.Model,com.oy.controller.User)]
23:27:15,973 DEBUG DefaultListableBeanFactory:246 - Returning cached instance of singleton bean 'myJsonController'
23:27:15,997 DEBUG AnnotationMethodHandlerExceptionResolver:132 - Resolving exception from handler [public com.oy.controller.User com.oy.controller.MyJsonController.requestJson(org.springframework.ui.Model,com.oy.controller.User)]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=utf-8' not supported
23:27:15,998 DEBUG ResponseStatusExceptionResolver:132 - Resolving exception from handler [public com.oy.controller.User com.oy.controller.MyJsonController.requestJson(org.springframework.ui.Model,com.oy.controller.User)]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=utf-8' not supported
23:27:15,999 DEBUG DefaultHandlerExceptionResolver:132 - Resolving exception from handler [public com.oy.controller.User com.oy.controller.MyJsonController.requestJson(org.springframework.ui.Model,com.oy.controller.User)]: org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=utf-8' not supported
23:27:15,999 DEBUG DispatcherServlet:999 - Null ModelAndView returned to DispatcherServlet with name 'springmvc': assuming HandlerAdapter completed request handling
23:27:15,999 DEBUG DispatcherServlet:946 - Successfully completed request

  使用<mvc:annotation-driven/>就没有问题

<!-- annotation-driven:默认创建了多个对象:RequestMappingHandlerMapping,RequestMappingHandlerAdapter
    也就提供对json格式支持
 -->
<mvc:annotation-driven/>

  测试页面(发送ajax请求)

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.8.3.js"></script>
<script type="text/javascript">
//请求json,返回json
 function request_json(){
    //JSON.stringify() 方法是将一个JavaScript值(对象或者数组)转换为一个 JSON字符串
    var user = JSON.stringify({name:"张三",age:20});
    $.ajax({         
        type:'POST',
        url: '${pageContext.request.contextPath}/json1.do',
         contentType:'application/json;charset=utf-8',
         data:user,
        success : function(data){             
            alert(data.name+":"+data.age);
        } 
     }) 
 }
</script>
</head>
<body>
<input type="button" onclick="request_json()" value="请求json,返回json">
</body>
</html>

  controller

@Controller
public class MyJsonController {
    
    @RequestMapping("/json1.do")
    @ResponseBody
    public User requestJson(Model model, @RequestBody User user){
        System.out.println("用户信息:" + user);
        return user;
    }
    
}

 

12、参数绑定    <--返回目录

Springmvc参数封装:基于方法进行封装。

接受参数类型:
    基本类型,int,String等等基本类型。
    Pojo类型
    包装类型

Springmvc默认支持类型:
    HttpSession,HttpRequstServlet,Model等等。

 

  controller

@Controller
public class MyJsonController {
    
    /**
     * 接收基本数据类型参数
     * http://localhost:8080/helloworld/params1.do?i=11
     *  
     * @param i
     * @param model
     * @return
     */
    @RequestMapping("/params1.do")
    public String hello1(Integer i, Model model){
        System.out.println("i:" + i);
        model.addAttribute("msg", i);
        return "msg";
    }
    
    /**
     * 接收字符串类型参数
     * http://localhost:8080/helloworld/params2.do?str=张三
     *  
     * @param i
     * @param model
     * @return
     */
    @RequestMapping("/params2.do")
    public String hello2(String str, Model model){
        System.out.println("str:" + str);
        model.addAttribute("msg", str);
        return "msg";
    }
    
    /**
     * 接收pojo或包装类型参数
     *  
     * @param i
     * @param model
     * @return
     */
    @RequestMapping("/ext.do")
    public String ext(UserExt ext, Model model){
        model.addAttribute("msg", ext.getExtId() + "--" + ext.getUser().getName()
                + "---" + ext.getUser().getAge());
        return "msg";
    }
    
}

 

  包装类UserExt

public class UserExt {
    private String extId;
    private User user;
    public String getExtId() {
        return extId;
    }
    public void setExtId(String extId) {
        this.extId = extId;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }
}

  测试页面jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

<form action="${pageContext.request.contextPath }/ext.do" method="post">
    extId:<input type="text" name="extId" id="extId">
    name:<input type="text" name="user.name" id="name">
    age:<input type="text" name="user.age" id="age">
<input type="submit" value="提交">
</form>

</body>
</html>

   

  springmvc接收数组类型的参数

@Controller
public class IndexController {
    @RequestMapping("/recieveArray.do")
    public String hello1(Integer[] ids, Model model){
        model.addAttribute("msg", Arrays.toString(ids));
        return "msg";
        
    }
}
<form action="${pageContext.request.contextPath }/recieveArray.do" method="post">
    id:<input type="checkbox" name="ids" value="1">
    id:<input type="checkbox" name="ids" value="2">
    id:<input type="checkbox" name="ids" value="3">
    <input type="submit" value="提交">
</form>

 

  springmvc接收list和map类型的参数:方法里面不能直接传递list和map,需要把list和map封装到包装类。

public class UserExt {
    private List<User> userList;
    private List<Integer> userIds;
    private Map<String, Object> map = new HashMap<>();
    public List<User> getUserList() {
        return userList;
    }
    public void setUserList(List<User> userList) {
        this.userList = userList;
    }
    public List<Integer> getUserIds() {
        return userIds;
    }
    public void setUserIds(List<Integer> userIds) {
        this.userIds = userIds;
    }
    
    public Map<String, Object> getMap() {
        return map;
    }
    public void setMap(Map<String, Object> map) {
        this.map = map;
    }
    @Override
    public String toString() {
        return "UserExt [userList=" + userList + ", userIds=" + userIds + ", map=" + map + "]";
    }
}

 

@Controller
public class IndexController {
    @RequestMapping("/recieveList.do")
    public String hello1(UserExt ext, Model model){
        model.addAttribute("msg", ext.toString());
        return "msg";
        
    }
}

 

<form action="${pageContext.request.contextPath }/recieveList.do" method="post">
    name:<input type="text" name="userList[0].name" id="name0">
    age<input type="text" name="userList[0].age" id="age0"><br/>
    
    name:<input type="text" name="userList[1].name" id="name1">
    age:<input type="text" name="userList[1].age" id="age1"><br/>
    
    userIds:<input type="checkbox" name="userIds" value="1">
    userIds:<input type="checkbox" name="userIds" value="2"><br/>
    
    map:<input type="text" name="map['key1']">
    map:<input type="text" name="map['key2']">
    <input type="submit" value="提交">
</form>

 

13、springmvc多视图支持    <--返回目录

  导入 spring.oxm.jar

  web.xml 配置

<!-- 前端控制器DispatcherServlet -->
<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 默认加载方式
       默认加载必须规范:
       * 文件命名:servlet-name-servlet.xml====springmvc-servlet.xml
       * 路径规范:必须在WEB-INF目录下面  -->
    <init-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>classpath:springmvc.xml</param-value>   
    </init-param>
    <load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

  springmvc.xml 配置

<!-- 多视图的支持 -->
   <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
       <property name="contentNegotiationManager">
           <bean class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean"/>
       </property>
       <property name="mediaTypes">
           <map>
               <entry key="json" value="application/json"/>
               <entry key="xml" value="application/xml"/>
           </map>
       </property>
       <property name="defaultViews">
           <list>
               <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView"/>
               <bean class="org.springframework.web.servlet.view.xml.MarshallingView">
                   <constructor-arg>
                       <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
                           <property name="classesToBeBound">
                               <list>
                                   <value>com.oy.controller.User</value>
                               </list>
                           </property>
                       </bean>
                   </constructor-arg>
               </bean>
           </list>
       </property>
   </bean>

  实体类上添加@XmlRootElement注解。

  controller

@Controller
@RequestMapping(value="/myController")//访问该类的方法时,前面多这样一个路径
public class MyJsonController {
    
    @RequestMapping("/multiView")
    public User hello1(){
        User u = new User();
        u.setName("zs");
        u.setAge(10);
        return u;
    }
    
}

  测试

---

posted on 2021-01-02 23:29  wenbin_ouyang  阅读(719)  评论(0编辑  收藏  举报