SpringMvc 视图解析器常见功能、类型转换、格式化

2023-03-17 08:57:58

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:aop="http://www.springframework.org/schema/aop"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd

        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-4.3.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">

    <!-- 扫描 有注解的包 -->

    <context:component-scan base-package="handler"></context:component-scan>

    <!--配置视图解析器(InternalResourceViewResolver)  -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/views/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

    <!--view-name会被视图解析器 加上前缀、后缀  -->

    <mvc:view-controller path="handler/testMvcViewController" view-name="success"/>

    <!-- 该注解 会让 springmvc： 接收一个请求，并且该请求 没有对应的@requestmapping时，将该请求 交给服务器默认的servlet去处理（直接访问）  -->

    <mvc:default-servlet-handler></mvc:default-servlet-handler>

    <!-- 1将 自定义转换器 纳入SpringIOC容器 -->

    <bean id="myConverter" class="converter.MyConverter"></bean>

    <!-- 2将myConverter再纳入 SpringMVC提供的转换器Bean

    <bean id="conversionService"  class="org.springframework.context.support.ConversionServiceFactoryBean">

        <property name="converters">

            <set>

                <ref bean="myConverter"/>

            </set>

        </property>

    </bean>

     -->

    <!-- 3将conversionService注册到annotation-driven中 -->

    <!--此配置是SpringMVC的基础配置，很功能都需要通过该注解来协调  -->

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

    <!-- 配置 数据格式化 注解 所依赖的bean FormattingConversionServiceFactoryBean:既可以实现格式化、又可以实现类型转换 -->

    <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">

        <property name="converters">

            <set>

                <ref bean="myConverter"/>

            </set>

        </property>

    </bean>

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"

         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

         version="3.1">

    <servlet>

        <servlet-name>springDispatcherServlet</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>classpath:springmvc.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>springDispatcherServlet</servlet-name>

        <url-pattern>/</url-pattern>

    </servlet-mapping>

    <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>

</web-app>

SpringMvcHandler

package handler;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import entity.Address;

import entity.Student;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.ui.ModelMap;

import org.springframework.validation.BindingResult;

import org.springframework.validation.FieldError;

import org.springframework.web.bind.annotation.CookieValue;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestHeader;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.SessionAttributes;

import org.springframework.web.servlet.ModelAndView;

//接口/类    注解   配置

//@SessionAttributes(value="student4")  //如果要在request中存放student4对象，则同时将该对象 放入session域中

//@SessionAttributes(types= {Student.class,Address.class})  //如果要在request中存放Student类型的对象，则同时将该类型对象 放入session域中

@Controller

@RequestMapping(value = "handler") //映射

public class SpringMVCHandler {

    @RequestMapping(value = "welcome", method = RequestMethod.POST, params = {"name=zs", "age!=23", "!height"})//映射

    public String welcome() {

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "welcome2", headers = {"Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8", "Accept-Encoding=gzip, deflate"})

    public String welcome2() {

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "welcome3/**/test")

    public String welcome3() {

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "welcome4/a?c/test")

    public String welcome4() {

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "welcome5/{name}")

    public String welcome5(@PathVariable("name") String name) {

        System.out.println(name);

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testRest/{id}", method = RequestMethod.POST)

    public String testPost(@PathVariable("id") Integer id) {

        System.out.println("post：增 " + id);

        //Service层实现 真正的增

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testRest/{id}", method = RequestMethod.GET)

    public String testGet(@PathVariable("id") Integer id) {

        System.out.println("get：查 " + id);

        //Service层实现 真正的增

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testRest/{id}", method = RequestMethod.DELETE)

    public String testDelete(@PathVariable("id") String id) {

        System.out.println("delete：删 " + id);

        //Service层实现 真正的增

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testRest/{id}", method = RequestMethod.PUT)

    public String testPut(@PathVariable("id") Integer id) {

        System.out.println("put：改 " + id);

        //Service层实现 真正的增

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testParam")

    public String testParam(@RequestParam("uname") String name, @RequestParam(value = "uage", required = false, defaultValue = "23") Integer age) {

//            String name = request.getParameter("uname");

        System.out.println(name);

        System.out.println(age);

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testRequestHeader")

    public String testRequestHeader(@RequestHeader("Accept-Language") String al) {

        System.out.println(al);

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testCookieValue")

    public String testCookieValue(@CookieValue("JSESSIONID") String jsessionId) {

        System.out.println(jsessionId);

        return "success";//  views/success.jsp，默认使用了 请求转发的 跳转方式

    }

    @RequestMapping(value = "testObjectProperties")

    public String testObjectProperties(Student student) {//student属性 必须 和 form表单中的属性Name值一致（支持级联属性）

        /*

            String name =     request.getParameter("name");

        int age= Integer.parseInt(request.getParameter("age")s)    ;

        String haddrss =     request.getParameter("homeaddress");

        String saddress =     request.getParameter("schooladdress");

        Address address = new Address();

        address.setHomeAddress(haddrss);

        address.setSchoolAddress(saddress);

            Student student = new Student();

            student.setName(name);

            student.setAddress(address);

        */

        System.out.println(student.getId() + "," + student.getName() + "," + student.getAddress().getHomeAddress() + "," + student.getAddress().getSchoolAddress());

        return "success";

    }

    @RequestMapping(value = "testServletAPI")

    public String testServletAPI(HttpServletRequest request, HttpServletResponse response) {

//            request.getParameter("uname") ;

        System.out.println(request);

        return "success";//succes.jsp

    }

    @RequestMapping(value = "testModelAndView")

    public ModelAndView testModelAndView() {//ModelAndView:既有数据，又有视图

        //ModelAndView:Model -M     View-V

        ModelAndView mv = new ModelAndView("success");//view:  views/success.jsp

        Student student = new Student();

        student.setId(2);

        student.setName("zs");

        mv.addObject("student", student);//相当于request.setAttribute("student", student);

        return mv;

    }

    @RequestMapping(value = "testModelMap")

    public String testModelMap(ModelMap mm) {//success

        Student student = new Student();

        student.setId(2);

        student.setName("zs");

        mm.put("student2", student);//request域

        //forward:           redirect:

        //

        return "redirect:/views/success.jsp";

    }

    @RequestMapping(value = "testMap")

    public String testMap(Map<String, Object> m) {

        Student student = new Student();

        student.setId(2);

        student.setName("zs");

        m.put("student3", student);//request域

        return "success";

    }

    @RequestMapping(value = "testModel")

    public String testModel(Model model) {

        Student student = new Student();

        student.setId(2);

        student.setName("zs");

        model.addAttribute("student4", student);//request域

        return "success";

    }

    @ModelAttribute//在任何一次请求前，都会先执行@ModelAttribute修饰的方法

    //@ModelAttribute  在请求 该类的各个方法前 均被执行的设计是基于一个思想：一个控制器 只做一个功能

    public void queryStudentById(Map<String, Object> map) {

        //StuentService stuService = new StudentServiceImpl();

        //Student student = stuService.queryStudentById(31);

        //模拟调用三层查询数据库的操作

        Student student = new Student();

        student.setId(31);

        student.setName("zs");

        student.setAge(23);

//            map.put("student", student) ;//约定：map的key 就是方法参数 类型的首字母小写

        map.put("stu", student);//约定：map的key 就是方法参数 类型的首字母小写

    }

    //修改:Zs-ls

    @RequestMapping(value = "testModelAttribute")

    public String testModelAttribute(@ModelAttribute("stu") Student student) {

        student.setName(student.getName());//将名字修改为ls

        System.out.println(student.getId() + "," + student.getName() + "," + student.getAge());

        return "success";

    }

    @RequestMapping(value = "testI18n")

    public String testI18n() {

        return "success";

    }

    @RequestMapping(value = "testConverter")

    public String testConverter(@RequestParam("studentInfo") Student student) {// 前端：2-zs-23

        System.out.println(student.getId() + "," + student.getName() + "," + student.getAge());

        return "success";

    }

    @RequestMapping(value = "testDateTimeFormat")//如果Student格式化出错，会将错误信息 传入result中

    public String testDateTimeFormat(Student student, BindingResult result) {

        System.out.println(student.getId() + "," + student.getName() + "," + student.getBirthday());

        if (result.getErrorCount() > 0) {

            for (FieldError error : result.getFieldErrors()) {

                System.out.println(error.getDefaultMessage());

            }

        }

        return "success";

    }

}

Myconvert

package converter;

import entity.Student;

import org.springframework.core.convert.converter.Converter;

public class MyConverter implements Converter<String, Student> {

    @Override

    public Student convert(String source) {//source:2-zs-23

        String[] studentStrArr = source.split("-");

        Student student = new Student();

        student.setId(Integer.parseInt(studentStrArr[0]));

        student.setName(studentStrArr[1]);

        student.setAge(Integer.parseInt(studentStrArr[2]));

        return student;

    }

}

index.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>

<!-- 如果web.xml中的配置是

      <servlet-mapping>

              <servlet-name>springDispatcherServlet</servlet-name>

              <url-pattern>.action</url-pattern>

      </servlet-mapping>

    <a href="user/welcome.action">first springmvc - welcome</a>    交由springmvc处理 找 @RuestMapping映射

    <a href="user/welcome.action">first springmvc - welcome</a>交由springmvc处理  找 @RuestMapping映射

    <a href="xxx/welcome">first springmvc - welcome</a>            交由servlet处理  找url-parttern /@WebServlet()

 -->

<a href="handler/welcome3/xyz/abcz/asb/test">33333333get - welcome</a>

<br/>

<a href="handler/welcome4/abc/test">4444444get - welcome</a>

<br/>

<a href="handler/welcome5/zs">555welcome</a>

<form action="handler/welcome" method="post">

    name:<input name="name"  ><br/>

    age:<input name="age"  >

    height:<input name="height"  >

    <input type="submit" value="post">

</form>

<br/>======<br/>

<form action="handler/testRest/1234" method="post">

    <input type="submit" value="增">

</form>

<form action="handler/testRest/1234" method="post">

    <input type="hidden"  name="_method" value="DELETE"/>

    <input type="submit" value="删">

</form>

<form action="handler/testRest/1234" method="post">

    <input type="hidden"  name="_method" value="PUT"/>

    <input type="submit" value="改">

</form>

<form action="handler/testRest/1234" method="get">

    <input type="submit" value="查">

</form>

------------<br/>

<form action="handler/testParam" method="get">

    name:<input name="uname" type="text" />

    <input type="submit" value="查">

</form>

<br/>

<a href="handler/testRequestHeader">testRequestHeader</a>

<br/>

<br/>

<a href="handler/testCookieValue">testCookieValue</a><br/>

<a href="handler/testServletAPI">testServletAPI</a>

<br/>

<form action="handler/testObjectProperties" method="post">

    id:<input name="id" type="text" />

    name:<input name="name" type="text" />

    家庭地址:<input name="address.homeAddress" type="text" />

    学校地址:<input name="address.schoolAddress" type="text" />

    <input type="submit" value="查">

</form>

<br/>

<a href="handler/testModelAndView">testModelAndView</a>

<br/>

<br/>

<a href="handler/testModelMap">testModelMap</a>

<br/>

<br/>

<a href="handler/testMap">testMap</a>

<br/>

<br/>

<a href="handler/testModel">testModel</a>

<br/>

<br/>

<a href="handler/testI18n">testI18n</a>

<br/>

<form action="handler/testModelAttribute" method="post">

    编号:<input name="id" type="hidden" value="31" />

    姓名:<input name="name" type="text" />

    <input type="submit" value="修改">

</form>

<br/>

<a href="handler/testMvcViewController">testMvcViewController</a>

<br/>

<form action="handler/testConverter" method="post">

    学生信息:<input name="studentInfo" type="text"  /><!-- 2-zs-23  -->

    <input type="submit" value="转换">

</form>

<form action="handler/testDateTimeFormat" method="post">

    编号:<input name="id" type="text" value="31" />

    姓名:<input name="name" type="text" />

    出生日期:<input name="birthday" type="text" />

    <input type="submit" value="修改">

</form>

</body>

</html>

success.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>

welcome  to spring mvc success<br/>

==== request:<br/>

${requestScope.student.id } -${requestScope.student.name } <br/>

${requestScope.student2.id } -${requestScope.student2.name }  <br/>

${requestScope.student3.id } -${requestScope.student3.name }  <br/>

${requestScope.student4.id } -${requestScope.student4.name }  <br/>

==== session:<br/>

${sessionScope.student.id } -${sessionScope.student.name } <br/>

${sessionScope.student2.id } -${sessionScope.student2.name }  <br/>

${sessionScope.student3.id } -${sessionScope.student3.name }  <br/>

${sessionScope.student4.id } -${sessionScope.student4.name }  <br/>

</body>

</html>

Student

package entity;

import org.springframework.format.annotation.DateTimeFormat;

public class Student {

    private int id;

    private String name;

    private Address address;

    public String getBirthday() {

        return birthday;

    }

    public void setBirthday(String birthday) {

        this.birthday = birthday;

    }

    @DateTimeFormat(pattern="yyyy-MM-dd")//格式化：前台传递来的数据，将前台传递来到数据 固定为yyyy-MM-dd

    private String birthday;

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    private int age;

    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 Address getAddress() {

        return address;

    }

    public void setAddress(Address address) {

        this.address = address;

    }

}

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