SpringMVC详细示例实战教程
一、SpringMVC基础入门,创建一个HelloWorld程序
1.首先,导入SpringMVC需要的jar包。
2.添加Web.xml配置文件中关于SpringMVC的配置
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<!--configure the setting of springmvcDispatcherServlet and configure the mapping--><servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <init-param>          <param-name>contextConfigLocation</param-name>          <param-value>classpath:springmvc-servlet.xml</param-value>      </init-param>      <!-- <load-on-startup>1</load-on-startup> --></servlet><servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>/</url-pattern></servlet-mapping> | 
3.在src下添加springmvc-servlet.xml配置文件
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<?xml version="1.0" encoding="UTF-8"?>    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">                        <!-- scan the package and the sub package -->    <context:component-scan base-package="test.SpringMVC"/>    <!-- don't handle the static resource -->    <mvc:default-servlet-handler />    <!-- if you use annotation you must configure following setting -->    <mvc:annotation-driven />         <!-- configure the InternalResourceViewResolver -->    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"            id="internalResourceViewResolver">        <!-- 前缀 -->        <property name="prefix" value="/WEB-INF/jsp/" />        <!-- 后缀 -->        <property name="suffix" value=".jsp" />    </bean></beans> | 
4.在WEB-INF文件夹下创建名为jsp的文件夹,用来存放jsp视图。创建一个hello.jsp,在body中添加“Hello World”。
5.建立包及Controller,如下所示
6.编写Controller代码
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@Controller@RequestMapping("/mvc")public class mvcController {    @RequestMapping("/hello")    public String hello(){                return "hello";    }} | 
7.启动服务器,键入 http://localhost:8080/项目名/mvc/hello
二、配置解析
1.Dispatcherservlet
DispatcherServlet是前置控制器,配置在web.xml文件中的。拦截匹配的请求,Servlet拦截匹配规则要自已定义,把拦截下来的请求,依据相应的规则分发到目标Controller来处理,是配置spring MVC的第一步。
2.InternalResourceViewResolver
视图名称解析器
3.以上出现的注解
@Controller 负责注册一个bean 到spring 上下文中
@RequestMapping 注解为控制器指定可以处理哪些 URL 请求
三、SpringMVC常用注解
@Controller
负责注册一个bean 到spring 上下文中
@RequestMapping
注解为控制器指定可以处理哪些 URL 请求
@RequestBody
该注解用于读取Request请求的body部分数据,使用系统默认配置的HttpMessageConverter进行解析,然后把相应的数据绑定到要返回的对象上 ,再把HttpMessageConverter返回的对象数据绑定到 controller中方法的参数上
@ResponseBody
该注解用于将Controller的方法返回的对象,通过适当的HttpMessageConverter转换为指定格式后,写入到Response对象的body数据区
@ModelAttribute
在方法定义上使用 @ModelAttribute 注解:Spring MVC 在调用目标处理方法前,会先逐个调用在方法级上标注了@ModelAttribute 的方法
在方法的入参前使用 @ModelAttribute 注解:可以从隐含对象中获取隐含的模型数据中获取对象,再将请求参数 –绑定到对象中,再传入入参将方法入参对象添加到模型中
@RequestParam
在处理方法入参处使用 @RequestParam 可以把请求参 数传递给请求方法
@PathVariable
绑定 URL 占位符到入参
@ExceptionHandler
注解到方法上,出现异常时会执行该方法
@ControllerAdvice
使一个Contoller成为全局的异常处理类,类中用@ExceptionHandler方法注解的方法可以处理所有Controller发生的异常
四、自动匹配参数
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//match automatically@RequestMapping("/person")public String toPerson(String name,double age){    System.out.println(name+" "+age);    return "hello";} | 
五、自动装箱
1.编写一个Person实体类
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package test.SpringMVC.model;public class Person {    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    private String name;    private int age;     } | 
2.在Controller里编写方法
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//boxing automatically@RequestMapping("/person1")public String toPerson(Person p){    System.out.println(p.getName()+" "+p.getAge());    return "hello";} | 
六、使用InitBinder来处理Date类型的参数
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//the parameter was converted in initBinder@RequestMapping("/date")public String date(Date date){    System.out.println(date);    return "hello";}    //At the time of initialization,convert the type "String" to type "date"@InitBinderpublic void initBinder(ServletRequestDataBinder binder){    binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"),            true));} | 
七、向前台传递参数
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//pass the parameters to front-end@RequestMapping("/show")public String showPerson(Map<String,Object> map){    Person p =new Person();    map.put("p", p);    p.setAge(20);    p.setName("jayjay");    return "show";} | 
前台可在Request域中取到"p"
八、使用Ajax调用
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//pass the parameters to front-end using ajax@RequestMapping("/getPerson")public void getPerson(String name,PrintWriter pw){    pw.write("hello,"+name);        }@RequestMapping("/name")public String sayHello(){    return "name";} | 
前台用下面的Jquery代码调用
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$(function(){    $("#btn").click(function(){       $.post("mvc/getPerson",{name:$("#name").val()},function(data){            alert(data);        });    });}); | 
九、在Controller中使用redirect方式处理请求
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//redirect @RequestMapping("/redirect")public String redirect(){    return "redirect:hello";} | 
十、文件上传
1.需要导入两个jar包
2.在SpringMVC配置文件中加入
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<!-- upload settings --><bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="maxUploadSize" value="102400000"></property></bean> | 
3.方法代码
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@RequestMapping(value="/upload",method=RequestMethod.POST)public String upload(HttpServletRequest req) throws Exception{    MultipartHttpServletRequest mreq = (MultipartHttpServletRequest)req;    MultipartFile file = mreq.getFile("file");    String fileName = file.getOriginalFilename();    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");            FileOutputStream fos = new FileOutputStream(req.getSession().getServletContext().getRealPath("/")+            "upload/"+sdf.format(new Date())+fileName.substring(fileName.lastIndexOf('.')));    fos.write(file.getBytes());    fos.flush();    fos.close();         return "hello";} | 
4.前台form表单
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<form action="mvc/upload" method="post" enctype="multipart/form-data">    <input type="file" name="file"><br>    <input type="submit" value="submit"></form> | 
十一、使用@RequestParam注解指定参数的name
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@Controller@RequestMapping("/test")public class mvcController1 {    @RequestMapping(value="/param")    public String testRequestParam(@RequestParam(value="id") Integer id,            @RequestParam(value="name")String name){        System.out.println(id+" "+name);        return "/hello";    }    } | 
十二、RESTFul风格的SringMVC
1.RestController
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@Controller@RequestMapping("/rest")public class RestController {    @RequestMapping(value="/user/{id}",method=RequestMethod.GET)    public String get(@PathVariable("id") Integer id){        System.out.println("get"+id);        return "/hello";    }         @RequestMapping(value="/user/{id}",method=RequestMethod.POST)    public String post(@PathVariable("id") Integer id){        System.out.println("post"+id);        return "/hello";    }         @RequestMapping(value="/user/{id}",method=RequestMethod.PUT)    public String put(@PathVariable("id") Integer id){        System.out.println("put"+id);        return "/hello";    }         @RequestMapping(value="/user/{id}",method=RequestMethod.DELETE)    public String delete(@PathVariable("id") Integer id){        System.out.println("delete"+id);        return "/hello";    }     } | 
2.form表单发送put和delete请求
在web.xml中配置
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<!-- configure the HiddenHttpMethodFilter,convert the post method to put or delete --><filter>    <filter-name>HiddenHttpMethodFilter</filter-name>    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class></filter><filter-mapping>    <filter-name>HiddenHttpMethodFilter</filter-name>    <url-pattern>/*</url-pattern></filter-mapping> | 
在前台可以用以下代码产生请求
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<form action="rest/user/1" method="post">    <input type="hidden" name="_method" value="PUT">    <input type="submit" value="put"></form><form action="rest/user/1" method="post">    <input type="submit" value="post"></form><form action="rest/user/1" method="get">    <input type="submit" value="get"></form><form action="rest/user/1" method="post">    <input type="hidden" name="_method" value="DELETE">    <input type="submit" value="delete"></form> | 
十三、返回json格式的字符串
1.导入以下jar包
2.方法代码
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@Controller@RequestMapping("/json")public class jsonController {         @ResponseBody    @RequestMapping("/user")    public  User get(){        User u = new User();        u.setId(1);        u.setName("jayjay");        u.setBirth(new Date());        return u;    }} | 
十四、异常的处理
1.处理局部异常(Controller内)
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@ExceptionHandlerpublic ModelAndView exceptionHandler(Exception ex){    ModelAndView mv = new ModelAndView("error");    mv.addObject("exception", ex);    System.out.println("in testExceptionHandler");    return mv;}    @RequestMapping("/error")public String error(){    int i = 5/0;    return "hello";} | 
2.处理全局异常(所有Controller)
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@ControllerAdvicepublic class testControllerAdvice {    @ExceptionHandler    public ModelAndView exceptionHandler(Exception ex){        ModelAndView mv = new ModelAndView("error");        mv.addObject("exception", ex);        System.out.println("in testControllerAdvice");        return mv;    }} | 
3.另一种处理全局异常的方法
在SpringMVC配置文件中配置
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<!-- configure SimpleMappingExceptionResolver --><bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">    <property name="exceptionMappings">        <props>            <prop key="java.lang.ArithmeticException">error</prop>        </props>    </property></bean> | 
error是出错页面
十五、设置一个自定义拦截器
1.创建一个MyInterceptor类,并实现HandlerInterceptor接口
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public class MyInterceptor implements HandlerInterceptor {    @Override    public void afterCompletion(HttpServletRequest arg0,            HttpServletResponse arg1, Object arg2, Exception arg3)            throws Exception {        System.out.println("afterCompletion");    }    @Override    public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,            Object arg2, ModelAndView arg3) throws Exception {        System.out.println("postHandle");    }    @Override    public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,            Object arg2) throws Exception {        System.out.println("preHandle");        return true;    }} | 
2.在SpringMVC的配置文件中配置
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<!-- interceptor setting --><mvc:interceptors>    <mvc:interceptor>        <mvc:mapping path="/mvc/**"/>        <bean class="test.SpringMVC.Interceptor.MyInterceptor"></bean>    </mvc:interceptor>        </mvc:interceptors> | 
3.拦截器执行顺序
十六、表单的验证(使用Hibernate-validate)及国际化
1.导入Hibernate-validate需要的jar包
(未选中不用导入)
2.编写实体类User并加上验证注解
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public class User {    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBirth() {        return birth;    }    public void setBirth(Date birth) {        this.birth = birth;    }    @Override    public String toString() {        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";    }        private int id;    @NotEmpty    private String name;    @Past    @DateTimeFormat(pattern="yyyy-MM-dd")    private Date birth;} | 
ps:@Past表示时间必须是一个过去值
3.在jsp中使用SpringMVC的form表单
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<form:form action="form/add" method="post" modelAttribute="user">    id:<form:input path="id"/><form:errors path="id"/><br>    name:<form:input path="name"/><form:errors path="name"/><br>    birth:<form:input path="birth"/><form:errors path="birth"/>    <input type="submit" value="submit"></form:form> | 
ps:path对应name
4.Controller中代码
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@Controller@RequestMapping("/form")public class formController {    @RequestMapping(value="/add",method=RequestMethod.POST)        public String add(@Valid User u,BindingResult br){        if(br.getErrorCount()>0){                        return "addUser";        }        return "showUser";    }         @RequestMapping(value="/add",method=RequestMethod.GET)    public String add(Map<String,Object> map){        map.put("user",new User());        return "addUser";    }} | 
ps:
1.因为jsp中使用了modelAttribute属性,所以必须在request域中有一个"user".
2.@Valid 表示按照在实体上标记的注解验证参数
3.返回到原页面错误信息回回显,表单也会回显
5.错误信息自定义
在src目录下添加locale.properties
NotEmpty.user.name=name can't not be empty
Past.user.birth=birth should be a past value
DateTimeFormat.user.birth=the format of input is wrong
typeMismatch.user.birth=the format of input is wrong
typeMismatch.user.id=the format of input is wrong
在SpringMVC配置文件中配置
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<!-- configure the locale resource --><bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">    <property name="basename" value="locale"></property></bean> | 
6.国际化显示
在src下添加locale_zh_CN.properties
username=账号
password=密码
locale.properties中添加
username=user name
password=password
创建一个locale.jsp
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<body>  <fmt:message key="username"></fmt:message>  <fmt:message key="password"></fmt:message></body> | 
在SpringMVC中配置
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<!-- make the jsp page can be visited --><mvc:view-controller path="/locale" view-name="locale"/> | 
让locale.jsp在WEB-INF下也能直接访问
最后,访问locale.jsp,切换浏览器语言,能看到账号和密码的语言也切换了
十七、压轴大戏--整合SpringIOC和SpringMVC
1.创建一个test.SpringMVC.integrate的包用来演示整合,并创建各类
2.User实体类
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public class User {    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBirth() {        return birth;    }    public void setBirth(Date birth) {        this.birth = birth;    }    @Override    public String toString() {        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";    }        private int id;    @NotEmpty    private String name;    @Past    @DateTimeFormat(pattern="yyyy-MM-dd")    private Date birth;} | 
3.UserService类
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@Componentpublic class UserService {    public UserService(){        System.out.println("UserService Constructor...\n\n\n\n\n\n");    }         public void save(){        System.out.println("save");    }} | 
4.UserController
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@Controller@RequestMapping("/integrate")public class UserController {    @Autowired    private UserService userService;         @RequestMapping("/user")    public String saveUser(@RequestBody @ModelAttribute User u){        System.out.println(u);        userService.save();        return "hello";    }} | 
5.Spring配置文件
在src目录下创建SpringIOC的配置文件applicationContext.xml
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<?xml version="1.0" encoding="UTF-8"?>    xsi:schemaLocation="http://www.springframework.org/schema/beans         "        >    <context:component-scan base-package="test.SpringMVC.integrate">        <context:exclude-filter type="annotation"            expression="org.springframework.stereotype.Controller"/>        <context:exclude-filter type="annotation"            expression="org.springframework.web.bind.annotation.ControllerAdvice"/>            </context:component-scan>     </beans> | 
在Web.xml中添加配置
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<!-- configure the springIOC --><listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:applicationContext.xml</param-value></context-param> | 
6.在SpringMVC中进行一些配置,防止SpringMVC和SpringIOC对同一个对象的管理重合
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<!-- scan the package and the sub package -->    <context:component-scan base-package="test.SpringMVC.integrate">        <context:include-filter type="annotation"            expression="org.springframework.stereotype.Controller"/>        <context:include-filter type="annotation"            expression="org.springframework.web.bind.annotation.ControllerAdvice"/>    </context:component-scan> | 
十八、SpringMVC详细运行流程图
十九、SpringMVC与struts2的区别
1、springmvc基于方法开发的,struts2基于类开发的。springmvc将url和controller里的方法映射。映射成功后springmvc生成一个Handler对象,对象中只包括了一个method。方法执行结束,形参数据销毁。springmvc的controller开发类似web service开发。
2、springmvc可以进行单例开发,并且建议使用单例开发,struts2通过类的成员变量接收参数,无法使用单例,只能使用多例。
3、经过实际测试,struts2速度慢,在于使用struts标签,如果使用struts建议使用jstl。
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