一、前言

之前我们通过springMVC前三章讲解了，springMVC的配置以及与mybatis整合的配置运用。这一章是具体的一些操作，可以直接看看项目，下载下来就ok；

二、Controller的返回结果

我们之前都是用modelAndView

1、现在我们看看所有Controller返回方式：void、String、modelAndView

2、

重定向redirect：request无法共享，url变化 用例："redirect:url"

页面转发forword：request共享，url不变化 用例："forward:url"

package com.ycy.controller;import com.ycy.dto.ItemsCustom;
import com.ycy.service.ItemsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;import java.util.List;/*** Created by Administrator on 2015/9/17 0017.*/
@Controller
@RequestMapping("/items")
public class ItemController {//注入service@Autowiredprivate ItemsService itemsService;/*** 商品展示** @param httpServletRequest* @param httpServletResponse* @return* @throws Exception*/@RequestMapping("/queryItems")public ModelAndView queryItems(javax.servlet.http.HttpServletRequest httpServletRequest,javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception {//如果是转发：httpServletRequest的数据是可以共享的ItemsCustom itemsCustom = new ItemsCustom();itemsCustom.setId(1);//商品列表List<ItemsCustom> itemsList = itemsService.findtemsList(null);//创建modelAndView准备填充数据、设置视图ModelAndView modelAndView = new ModelAndView();//填充数据modelAndView.addObject("itemsList", itemsList);//视图modelAndView.setViewName("order/itemsList");return modelAndView;}/*** 修改商品信息1.1* @return* @throws Exception*/@RequestMapping("/editItems1")public ModelAndView editItems() throws Exception {ModelAndView modelAndView = new ModelAndView();ItemsCustom itemsCustom = itemsService.getItemsById(1, null);modelAndView.addObject("item",itemsCustom);modelAndView.setViewName("order/editItem");return modelAndView;}/*** 修改商品信息1.2* @return* @throws Exception*/@RequestMapping("/editItems2")public String editItems(Model model) throws Exception {ModelAndView modelAndView = new ModelAndView();ItemsCustom itemsCustom = itemsService.getItemsById(1, null);model.addAttribute("item", itemsCustom);return "order/editItem";}/*** 修改商品信息1.3* @return* @throws Exception*/@RequestMapping("/editItems")public void editItems(javax.servlet.http.HttpServletRequest httpServletRequest,javax.servlet.http.HttpServletResponse httpServletResponse) throws Exception {ModelAndView modelAndView = new ModelAndView();ItemsCustom itemsCustom = itemsService.getItemsById(1, null);httpServletRequest.setAttribute("item", itemsCustom);httpServletRequest.getRequestDispatcher("/pages/jsp/order/editItem.jsp").forward(httpServletRequest,httpServletResponse);/*** 使用此方法，容易输出json、xml格式的数据：通过response指定响应结果，例如响应json数据如下：response.setCharacterEncoding("utf-8");response.setContentType("application/json;charset=utf-8");response.getWriter().write("json串");*/}/*** 修改商品属性* @return*/@RequestMapping("/editItemSubmit")public String editItemSubmit(){//重定向  request数据无法共享，url地址栏会发生变化的 页面地址：editItemSubmitreturn  "redirect:queryItems";//转发   request数据可以共享，url地址栏不会变化 页面地址：queryItems//return  "forward:queryItems";}
}

三、Controller的参数

来自摘抄：

早期springmvc是使用PropertyEditor属性编辑器进行参数绑定(仅支持由字符串传为其它类型)

后期springmvc是使用converter转换器进行参数绑定（支持任意类型转换）

参数类型：

1、HttpServletRequest：请求信息

2、HttpServletResponse：处理响应

3、HttpSession：得到session中值

4、Model：通过Model向页面传递数据

5、@RequestParam：对应形参一样自动匹配，否则指定匹配。可以设置默认值，可以设定是否必须传递。

6、简单类型与po类型：int 、double、string、 boolean、 实体UserInfo

示例如下：

  @RequestMapping("/testRequestParam")public  void testRequestParam(@RequestParam(value="queryName", required=true,defaultValue = "") String name ){// 上面的对传入参数指定为queryName，如果前端不传queryName参数名，会报错// required=false表示不传的话，会给参数赋值为null，required=true就是必须要有}@RequestMapping("/testModel")public  String testModel(Model model )throws Exception {ModelAndView modelAndView = new ModelAndView();ItemsCustom itemsCustom = itemsService.getItemsById(1, null);model.addAttribute("item", itemsCustom);return "order/editItem";}@RequestMapping("/testHttpSession")public  void testHttpSession(HttpSession  httpSession )throws Exception {httpSession.getAttribute("username");}@RequestMapping("/testHttpSession")public  void testHttprequest(javax.servlet.http.HttpServletRequest httpServletRequest,javax.servlet.http.HttpServletResponse httpServletResponse)throws Exception {httpServletRequest.setAttribute("obj", null);httpServletRequest.getRequestDispatcher("/pages/jsp/XXX/XXXX.jsp").forward(httpServletRequest,httpServletResponse);}

2.1自定义参数（了解）

2.1.1 Controller内自定义属性编辑器

 //自定义编辑器/*** 注册属性编辑器(字符串转换为日期)*/@InitBinderpublic void initBinder(WebDataBinder binder) throws Exception {binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH-mm-ss"),true));//System.out.println("init binder =======================");binder.registerCustomEditor(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, false));binder.registerCustomEditor(Integer.class, null,new CustomNumberEditor(Integer.class, null, true));binder.registerCustomEditor(Long.class, null, new CustomNumberEditor(Long.class, null, true));binder.registerCustomEditor(Float.class, new CustomNumberEditor(Float.class, true));binder.registerCustomEditor(Double.class, new CustomNumberEditor(Double.class, true));binder.registerCustomEditor(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));}

package com.ycy.propertyeditor;import org.springframework.beans.PropertyEditorRegistrar;
import org.springframework.beans.PropertyEditorRegistry;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.beans.propertyeditors.CustomNumberEditor;import java.beans.PropertyEditor;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.util.Date;/**自定义属性编辑器* Created by Administrator on 2015/9/24 0024.*/
public class CustomPropertyEditor implements PropertyEditorRegistrar {@Overridepublic void registerCustomEditors(PropertyEditorRegistry binder) {binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH-mm-ss"),true));//System.out.println("init binder =======================");binder.registerCustomEditor(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, false));binder.registerCustomEditor(Integer.class, null,new CustomNumberEditor(Integer.class, null, true));binder.registerCustomEditor(Long.class, null, new CustomNumberEditor(Long.class, null, true));binder.registerCustomEditor(Float.class, new CustomNumberEditor(Float.class, true));binder.registerCustomEditor(Double.class, new CustomNumberEditor(Double.class, true));binder.registerCustomEditor(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));}
}

<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/beanshttp://www.springframework.org/schema/beans/spring-beans-4.0.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-4.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-4.0.xsd "><!--1、=========================dispatcher已经在web.xml里面配置==================================--><!-- 使用spring组件扫描 --><context:component-scan base-package="com.ycy.controller"/><!-- 2、3 通过annotation-driven可以替代下边的处理器映射器和适配器 --><!--     <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>--><!--2、=======================使用注解RequestMappingInfoHandlerMapping映射器======================--><bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/><!--3、=============================处理器适配器HandlerAdapter====================================--><bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><!--注解适配器:加入我们的属性解析器 --><property name="webBindingInitializer" ref="customBinder"></property></bean><!--4、============================视图解析器ViewResolver======================================--><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/><property name="prefix" value="/pages/jsp/"/><property name="suffix" value=".jsp"/></bean><!--5、视图view与hanlder需要自己实现--><!-- ================================自定义webBinder:属性编辑器===================================--><bean id="customBinder"class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer"><property name="propertyEditorRegistrars"><list><!-- 注册属性编辑器 --><bean id="customPropertyEditor" class="com.ycy.propertyeditor.CustomPropertyEditor" /></list></property></bean></beans>

package com.ycy.controller.converter;import org.springframework.core.convert.converter.Converter;import java.text.SimpleDateFormat;
import java.util.Date;/*** Created by Administrator on 2015/9/24 0024.*/
public class CustomDateConverter implements Converter<String, Date> {@Overridepublic Date convert(String source) {try {SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return simpleDateFormat.parse(source);} catch (Exception e) {e.printStackTrace();}return null;}}</span>

 <bean id="customBinder"class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer"><property name="conversionService" ref="conversionService" /></bean><!-- conversionService --><bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean"><!-- 转换器 --><property name="converters"><list><bean class="com.ycy.controller.converter.CustomDateConverter"/></list></property></bean>

 <!--3、=============================处理器适配器HandlerAdapter====================================--><bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><!--注解适配器:加入我们的属性解析器 --><property name="webBindingInitializer" ref="customBinder"></property></bean>

<!-- conversionService --><bean id="conversionService"class="org.springframework.format.support.FormattingConversionServiceFactoryBean"><!-- 转换器 --><property name="converters"><list><bean class="com.ycy.controller.converter.CustomDateConverter"/></list></property></bean>

<mvc:annotation-driven conversion-service="conversionService">
</mvc:annotation-driven>