SpringMVC响应

2023-11-12 08:42:46

对应响应的 pom.xml文件配置

响应的本质都是传递数据流

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>SpringMVC_response</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>


    <dependencies>
        <!--   servlet 规范坐标-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!--  jsp坐标-->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>
        <!--   spring的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.1.RELEASE</version>
        </dependency>
        <!--        springMvc的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <!--        springweb坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.22</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.21</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>com.alipay.sdk</groupId>
            <artifactId>alipay-sdk-java</artifactId>
            <version>3.4.49.ALL</version>
        </dependency>


<!--        对应JSON的坐标-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.0</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>

    <!-- 构建-->
    <build>
        <!--maven插件-->
        <plugins>
            <!--jdk编译插件-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <!--加入对应的maven版本号码-->
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>utf-8</encoding>
                </configuration>
            </plugin>
            <!--tomcat插件-->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <!--端口控制-->
                    <port>80</port>
                    <!--项目路径控制意味着http://localhost:8080/abc-->
                    <path>/Spring_exploded</path>
                    <!--编码-->
                    <uriEncoding>UTF-8</uriEncoding>
                    <ignorePackaging>true</ignorePackaging>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

web.xml 乱码过滤器以及 DispatcherServlet

    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>enconding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>


    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--     从类路径下  进行加载文件-->
            <param-value>classpath*:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

不带参数的响应

页面跳转方式转发和重定向
默认是转发格式

@Controller
public class UserController {


    @RequestMapping("/showpage1")
    public String showPage1(){
        System.out.println("user mvc showpage1 running ");
        return "forward:page.jsp";
    }


    @RequestMapping("/showpage2")
    public String showPage2(){
        System.out.println("user mvc showpage2 running ");
        return "redirect:page.jsp";
    }


//     这种拼接格式  不适用于 forward 以及 redirect
    @RequestMapping("/showpage3")
    public String showPage3(){
        System.out.println("user mvc showpage3 running ");
        return "page";
    }


    @RequestMapping("/showpage4")
    public void showPage4(){
        System.out.println("user mvc controller running ");
    }
}

页面访问快捷设定
展示页面保存位置通常固定且结构相似可以谁当通用的范围跟的路径检化页面配置格式

<!--   注入访问的 前缀和 访问的 后缀   (类似于 字符串拼接)-->
<!--
        modelAndView.setViewName("forward:page.jsp");
        return modelAndView;
        使用这个的时候  需要将整个注入访问  进行注释
        -->
    <bean   class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix"  value="/WEB-INF/page/"/>
        <property name="suffix"  value=".jsp"/>
    </bean>

没有设定返回值的页面跳转
自动进行拼接和前面的进行跳转

    @RequestMapping("/showpage4")
    public void showPage4(){
        System.out.println("user mvc controller running ");
    }

携带数据页面的跳转设定

使用HttpServletRequest类型形参进行数据传递
使用Model类型形参进行数据传递
使用ModelAndView类型形参进行数据传递将该对象作为返回值传递给调用者
使用ModelAndView类型形参进行形参数据传递将该对象作为返回值转递个调用者

使用ModerlAndView于和页面访问快捷设定有冲突不能一起使用

@Controller
public class BookController {


    @RequestMapping("/showPageAndDate")
    public String showPageAndDate(HttpServletRequest request){
        request.setAttribute("name","罗大林");
        return "page";
    }

    @RequestMapping("/showPageAndDate2")
    public String showPageAndDate2(Model model){
        System.out.println("user mvc showPageAndDate2 running ");
        model.addAttribute("name","罗二林");
        Book book  = new Book();
        book.setBook("SpringMVC入门");
        book.setPrice(666);
        model.addAttribute("book",book);
        return "page";
    }

    @RequestMapping("/showPageAndDate3")
    public ModelAndView showPageAndDate3(ModelAndView modelAndView){
        // ModelAndView M = new ModelAndView();   可以  替换形参中的参数
        Book book  = new Book();
        book.setBook("SpringMVC入门");
        book.setPrice(666);
        modelAndView.addObject("book",book);
        modelAndView.addObject("name","罗三林");

        modelAndView.setViewName("page");
        return modelAndView;
    }


    @RequestMapping("/showPageAndDate4")
    public ModelAndView showPageAndDate4(ModelAndView modelAndView){
        modelAndView.setViewName("forward:page.jsp");
        return modelAndView;
    }

    @RequestMapping("/showPageAndDate5")
    public ModelAndView showPageAndDate5(ModelAndView modelAndView){
        modelAndView.setViewName("redirect:page.jsp");
        return modelAndView;
    }
}

返回值类型是是JSON
需要进行转换

使用response对象完成数据返回
加上@ResponseBody 该注解可以直接再页面返回对应的返回值
引入JSON坐标使用转换器进行转换

使用SpringMVC提供的消息类型转换器将对象与集合数据自动转换为JSON数据

开启驱动

对应的实体类

@Controller
public class AccountController {
    @RequestMapping("/showData1")
    public void showData1(HttpServletResponse response) throws IOException {
        response.getWriter().write("message");
    }

    @RequestMapping("/showData2")
    @ResponseBody   // 加上该注解  表示页面展示的就是返回的内容
    public String showData2()  {
       return "message";
    }

    @RequestMapping("/showData3")
    @ResponseBody
    public String showData3() throws JsonProcessingException {

        Book book  = new Book();
        book.setBook("SpringMVC入门");
        book.setPrice(666);

        ObjectMapper om = new ObjectMapper();
       return  om.writeValueAsString(book);

    }

    @RequestMapping("/showData4")
    @ResponseBody
    public Book showData4()  {
        Book book  = new Book();
        book.setBook("SpringMVC入门");
        book.setPrice(666);
        return book;

    }

    @RequestMapping("/showData5")
    @ResponseBody
    public List showData5()  {
        Book book1  = new Book();
        book1.setBook("SpringMVC入门");
        book1.setPrice(666);

        Book book  = new Book();
        book.setBook("SpringMVC入门");
        book.setPrice(666);

        ArrayList list  = new ArrayList();

        list.add(book);
        list.add(book1);

        return list;
    }
}

码农公寓

不带参数的响应

携带数据页面的跳转设定

相关文章