02_springmvc

一、介绍

在这里插入图片描述

DispatcherServlet：前端控制器，是整体流程控制的中心，由其调用其它组件处理用户的请求，有
效的降低了组件间的耦合性
HandlerMapping：处理器映射器，负责根据用户请求找到对应具体的Handler处理器
Handler：处理器，业务处理的核心类，通常由开发者编写，描述具体的业务
HandlAdapter：处理器适配器，通过它对处理器进行执行
View Resolver：视图解析器，将处理结果生成View视图
View：视图，最终产出结果，常用视图如jsp、 html
1、基本配置


<context:component-scan base-package="com.itheima">
    <context:include-filter
                            type="annotation"
                            expression="org.springframework.stereotype.Controller"/>
</context:component-scan>

静态资源加载
<!--放行指定类型静态资源配置方式-->
<mvc:resources mapping="/img/**" location="/img/"/>
<mvc:resources mapping="/js/**" location="/js/"/>
<mvc:resources mapping="/css/**" location="/css/"/>

<!--SpringMVC提供的通用资源放行方式-->
<mvc:default-servlet-handler/>


中文乱码处理 
<!--乱码处理过滤器，与Servlet中使用的完全相同，差异之处在于处理器的类由Spring提供-->
<filter>
    <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

注解驱动
@Configuration
@ComponentScan(value = "com.itheima",includeFilters =
    @ComponentScan.Filter(type=FilterType.ANNOTATION,classes = {Controller.class})
    )
public class SpringMVCConfiguration implements WebMvcConfigurer{
    //注解配置放行指定资源格式
//    @Override
//    public void addResourceHandlers(ResourceHandlerRegistry registry) {
//        registry.addResourceHandler("/img/**").addResourceLocations("/img/");
//        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
//        registry.addResourceHandler("/css/**").addResourceLocations("/css/");
//    }

    //注解配置通用放行资源的格式
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();;
    }
}



public class ServletContainersInitConfig extends AbstractDispatcherServletInitializer {
    //创建Servlet容器时，使用注解的方式加载SPRINGMVC配置类中的信息，并加载成WEB专用的			           //ApplicationContext对象
    //该对象放入了ServletContext范围，后期在整个WEB容器中可以随时获取调用
    @Override
    protected WebApplicationContext createServletApplicationContext() {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(SpringMVCConfiguration.class);
        return ctx;
    }

    //注解配置映射地址方式，服务于SpringMVC的核心控制器DispatcherServlet
    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }

    @Override
    protected WebApplicationContext createRootApplicationContext() {
        return null;
    }

    //乱码处理作为过滤器，在servlet容器启动时进行配置，相关内容参看Servlet零配置相关课程
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        super.onStartup(servletContext);
        CharacterEncodingFilter cef = new CharacterEncodingFilter();
        cef.setEncoding("UTF-8");
        FilterRegistration.Dynamic registration = servletContext.addFilter("characterEncodingFilter", cef);
        registration.addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST,DispatcherType.FORWARD,DispatcherType.INCLUDE),false,"/*");
    }
}

2、请求

普通类型传参
pojo传参
数组与集合类型传参
类型转换器

日期类型转换器
<!--5.启用自定义Converter-->
<mvc:annotation-driven conversion-service="conversionService"/>
<!--1.设定格式类型Converter，注册为Bean，受SpringMVC管理-->
<bean id="conversionService"
      class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <!--2.自定义Converter格式类型设定，该设定使用的是同类型覆盖的思想-->
    <property name="formatters">
        <!--3.使用set保障相同类型的转换器仅保留一个，避免冲突-->
        <set>
            <!--4.设置具体的格式类型-->
            <bean class="org.springframework.format.datetime.DateFormatter">
                <!--5.类型规则-->
                <property name="pattern" value="yyyy-MM-dd"/>
            </bean>
        </set>
    </property>
</bean>


@DateTimeFormat(pattern = "yyyy-MM-dd")
private Date birthday;



public String requestParam12(@DateTimeFormat(pattern = "yyyy-MM-dd") Date date){
    System.out.println("date="+date);
    return "page.jsp";
}

自定义类型转换器
  <!--1.将自定义Converter注册为Bean，受SpringMVC管理-->
  <bean id="myDateConverter" class="com.itheima.converter.MyDateConverter"/>
  <!--2.设定自定义Converter服务bean-->
  <bean id="conversionService"
        class="org.springframework.context.support.ConversionServiceFactoryBean">
      <!--3.注入所有的自定义Converter，该设定使用的是同类型覆盖的思想-->
      <property name="converters">
          <!--4.set保障同类型转换器仅保留一个，去重规则以Converter<S,T>的泛型为准-->
          <set>
              <!--5.具体的类型转换器-->
              <ref bean="myDateConverter"/>
          </set>
      </property>
  </bean>


//自定义类型转换器，实现Converter接口，接口中指定的泛型即为最终作用的条件
//本例中的泛型填写的是String，Date，最终出现字符串转日期时，该类型转换器生效
public class MyDateConverter implements Converter<String, Date> {
    //重写接口的抽象方法，参数由泛型决定
    public Date convert(String source) {
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
        Date date = null;
        //类型转换器无法预计使用过程中出现的异常，因此必须在类型转换器内部捕获，不允许抛出，框架无法预计此类异常如何处理
        try {
            date = df.parse(source);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return date;
    }
}



<!--开启注解驱动，加载自定义格式化转换器对应的类型转换服务-->
<mvc:annotation-driven conversion-service="conversionService"/>

请求映射

@requestmapping:作用在类或者方法上面

常用属性
@RequestMapping(
    value="/requestURL3", //设定请求路径，与path属性、 value属性相同
    method = RequestMethod.GET, //设定请求方式
    params = "name", //设定请求参数条件
    headers = "content-type=text/*", //设定请求消息头条件
    consumes = "text/*", //用于指定可以接收的请求正文类型（MIME类型）
    produces = "text/*" //用于指定可以生成的响应正文类型（MIME类型）
)
public String requestURL3() {
    return "/page.jsp";
}

3、响应

页面跳转

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

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

带数据页面跳转

使用HttpServletRequest类型形参进行数据传递
@RequestMapping("/showPageAndData1")
public String showPageAndData1(HttpServletRequest request) {
    request.setAttribute("name","itheima");
    return "page";
}


使用Model类型形参进行数据传递
@RequestMapping("/showPageAndData2")
public String showPageAndData2(Model model) {
    model.addAttribute("name","itheima");
    Book book = new Book();
    book.setName("SpringMVC入门实战");
    book.setPrice(66.6d);
    model.addAttribute("book",book);
    return "page";
}


使用ModelAndView类型形参进行数据传递
//使用ModelAndView形参传递参数，该对象还封装了页面信息
@RequestMapping("/showPageAndData3")
public ModelAndView showPageAndData3(ModelAndView modelAndView) {
    //ModelAndView mav = new ModelAndView();    替换形参中的参数
    Book book  = new Book();
    book.setName("SpringMVC入门案例");
    book.setPrice(66.66d);
    //添加数据的方式，key对value
    modelAndView.addObject("book",book);
    //添加数据的方式，key对value
    modelAndView.addObject("name","Jockme");
    //设置页面的方式，该方法最后一次执行的结果生效
    modelAndView.setViewName("page");
    //返回值设定成ModelAndView对象
    return modelAndView;
}



基于response返回数据的简化格式，返回JSON数据  
//使用jackson进行json数据格式转化
@RequestMapping("/showData3")
@ResponseBody
public String showData3() throws JsonProcessingException {
    Book book  = new Book();
    book.setName("SpringMVC入门案例");
    book.setPrice(66.66d);

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



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
@RequestMapping("/showData4")
@ResponseBody
public Book showData4() {
    Book book  = new Book();
    book.setName("SpringMVC入门案例");
    book.setPrice(66.66d);
    return book;
}
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
        </list>
    </property>
</bean>

使用SpringMVC注解驱动简化配置 
<!--开启springmvc注解驱动，对@ResponseBody的注解进行格式增强，追加其类型转换的功能，具体实现由MappingJackson2HttpMessageConverter进行-->
<mvc:annotation-driven/>

Servlet相关接口-Servlet相关接口替换方案

pringMVC提供访问原始Servlet接口API的功能，通过形参声明即可
@RequestMapping("/servletApi")
public String servletApi(HttpServletRequest request,
                         HttpServletResponse response, HttpSession session){
    System.out.println(request);
    System.out.println(response);
    System.out.println(session);
    request.setAttribute("name","itheima");
    System.out.println(request.getAttribute("name"));
    return "page.jsp";
}



Head数据获取
@RequestMapping("/headApi")
public String headApi(@RequestHeader("Accept-Language") String head){
    System.out.println(head);
    return "page.jsp";
}  

Cookie数据获取
@RequestMapping("/cookieApi")
public String cookieApi(@CookieValue("JSESSIONID") String jsessionid){
    System.out.println(jsessionid);
    return "page.jsp";
}  



Session数据获取
@RequestMapping("/sessionApi")
public String sessionApi(@SessionAttribute("name") String name){
    System.out.println(name);
    return "page.jsp";
}  

Session数据设置
@Controller
@SessionAttributes(names={"name"})
public class ServletController {
    @RequestMapping("/setSessionData2")
    public String setSessionDate2(Model model) {
        model.addAttribute("name", "Jock2");
        return "page.jsp";
    }
}

二、应用
1、异步调用

<a href="javascript:void(0);" id="testAjax">访问controller</a>
<script type="text/javascript" src="/js/jquery-3.3.1.min.js"></script>
<script type="text/javascript">
    $(function(){
    $("#testAjax").click(function(){ //为id="testAjax"的组件绑定点击事件
        $.ajax({ //发送异步调用
            type:"POST", //请求方式： POST请求
            url:"ajaxController", //请求参数（也就是请求内容）
            data:'ajax message', //请求参数（也就是请求内容）
            dataType:"text", //响应正文类型
            contentType:"application/text", //请求正文的MIME类型
        });
    });
});
</script>

接受异步请求参数 @RequestBody

@RequestMapping("/ajaxController")
public String ajaxController(@RequestBody String message){
    System.out.println(message);
    return "page.jsp";
}

2、异步请求跨域访问

跨域访问支持:@CrossOrigin

3、拦截器

在这里插入图片描述

拦截器VS过滤器
归属不同： Filter属于Servlet技术， Interceptor属于SpringMVC技术
拦截内容不同： Filter对所有访问进行增强， Interceptor仅针对SpringMVC的访问进行增强

实现HandlerInterceptor接口
配置拦截器

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/showPage"/>
        <bean class="com.itheima.interceptor.MyInterceptor"/>
    </mvc:interceptor>
</mvc:interceptors>

4、异常处理

实现HandlerExceptionResolver接口
@ControllerAdvice @ExceptionHandler(Exception.class)
异常处理解决方案

业务异常：
  发送对应消息传递给用户，提醒规范操作
系统异常：
  发送固定消息传递给用户，安抚用户
  发送特定消息给运维人员，提醒维护
  记录日志
其他异常：
  发送固定消息传递给用户，安抚用户
  发送特定消息给编程人员，提醒维护
  纳入预期范围内
  记录日志

5、使用技术

文件上传下载

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.4</version>
</dependency>

页面表单
<form action="/fileupload" method="post" enctype="multipart/form-data">
    上传LOGO： <input type="file" name="file"/><br/>
    <input type="submit" value="上传"/>
</form>

SpringMVC配置
<bean id="multipartResolver"
      class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
</bean>

控制器  
@RequestMapping(value = "/fileupload")
public void fileupload(MultipartFile file){
    file.transferTo(new File("file.png"));
}

文件上传注意事项

 文件命名问题， 获取上传文件名，并解析文件名与扩展名
 文件名过长问题
 文件保存路径
 重名问题
 @RequestMapping(value = "/fileupload")
//参数中定义MultipartFile参数，用于接收页面提交的type=file类型的表单，要求表单名称与参数名相同
public String fileupload(MultipartFile file,MultipartFile file1,MultipartFile file2, HttpServletRequest request) throws IOException {
    System.out.println("file upload is running ..."+file);
    //        MultipartFile参数中封装了上传的文件的相关信息
    //        System.out.println(file.getSize());
    //        System.out.println(file.getBytes().length);
    //        System.out.println(file.getContentType());
    //        System.out.println(file.getName());
    //        System.out.println(file.getOriginalFilename());
    //        System.out.println(file.isEmpty());
    //首先判断是否是空文件，也就是存储空间占用为0的文件
    if(!file.isEmpty()){
        //如果大小在范围要求内正常处理，否则抛出自定义异常告知用户（未实现）
        //获取原始上传的文件名，可以作为当前文件的真实名称保存到数据库中备用
        String fileName = file.getOriginalFilename();
        //设置保存的路径
        String realPath = request.getServletContext().getRealPath("/images");
        //保存文件的方法，指定保存的位置和文件名即可，通常文件名使用随机生成策略产生，避免文件名冲突问题
        file.transferTo(new File(realPath,file.getOriginalFilename()));
    }
    //测试一次性上传多个文件
    if(!file1.isEmpty()){
        String fileName = file1.getOriginalFilename();
        //可以根据需要，对不同种类的文件做不同的存储路径的区分，修改对应的保存位置即可
        String realPath = request.getServletContext().getRealPath("/images");
        file1.transferTo(new File(realPath,file1.getOriginalFilename()));
    }
    if(!file2.isEmpty()){
        String fileName = file2.getOriginalFilename();
        String realPath = request.getServletContext().getRealPath("/images");
        file2.transferTo(new File(realPath,file2.getOriginalFilename()));
    }
    return "page.jsp";
}

三、拓展

1、rest风格

优点
隐藏资源的访问行为，通过地址无法得知做的是何种操作
书写简化

方式
 GET（查询） http://localhost/user/1 GET
 POST（保存） http://localhost/user POST
 PUT（更新） http://localhost/user PUT
 DELETE（删除） http://localhost/user DELETE



<!--配置拦截器，解析请求中的参数_method，否则无法发起PUT请求与DELETE请求，配合页面表单使用-->
<filter>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <servlet-name>DispatcherServlet</servlet-name>
</filter-mapping>

 开启SpringMVC对Restful风格的访问支持过滤器，即可通过页面表单提交PUT与DELETE请求
 页面表单使用隐藏域提交请求类型，参数名称固定为_method，必须配合提交类型method=post使用c
<form action="/user/1" method="post">
    <input type="hidden" name="_method" value="PUT"/>
    <input type="submit"/>
</form>  

@RestController
public class UserController {
    @RequestMapping(value = "/user/{id}",method = RequestMethod.DELETE)
    public String restDelete(@PathVariable String id){
        System.out.println("restful is running ....delete:"+id);
        return "success.jsp";
    }
}

2、校验框架

分类

校验位置：
  客户端校验
  服务端校验
校验内容与对应方式：
  格式校验
    客户端：使用Js技术，利用正则表达式校验
    服务端：使用校验框架 
  逻辑校验
    客户端：使用ajax发送要校验的数据，在服务端完成逻辑校验，返回校验结果
    服务端：接收到完整的请求后，在执行业务操作前，完成逻辑校验
表单校验规则
 长度：例如用户名长度，评论字符数量
 非法字符：例如用户名组成
 数据格式：例如Email格式、 IP地址格式
 边界值：例如转账金额上限，年龄上下限
 重复性：例如用户名是否重复

校验框架hibernate-validator

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>6.1.0.Final</version>
</dependency>


开启校验

名称：@Valid 、 @Validated
 类型：形参注解
 位置：处理器类中的实体类类型的方法形参前方
 作用：设定对当前实体类类型参数进行校验
 @RequestMapping(value = "/addemployee")
public String addEmployee(@Valid Employee employee) {
    System.out.println(employee);
}

设置校验规则
 名称：@NotNull
 类型：属性注解 等
 位置：实体类属性上方
 作用：设定当前属性校验规则
 public class Employee{
    @NotNull(message = "姓名不能为空")
    private String name;//员工姓名
}  

获取错误信息
@RequestMapping(value = "/addemployee")
public String addEmployee(@Valid Employee employee, Errors errors, Model model){
    System.out.println(employee);
    if(errors.hasErrors()){
        for(FieldError error : errors.getFieldErrors()){
            model.addAttribute(error.getField(),error.getDefaultMessage());
        }
        return "addemployee.jsp";
    }
    return "success.jsp";
}  



规则校验

@NotNull(message = "请输入您的年龄")
@Max(value = 60,message = "年龄最大值不允许超过60岁")
@Min(value = 18,message = "年龄最小值不允许低于18岁")
private Integer age;//员工年龄


嵌套校验
public class Employee {
    //实体类中的引用类型通过标注@Valid注解，设定开启当前引用类型字段中的属性参与校验
    @Valid
    private Address address;
}


分组校验
对不同种类的属性进行分组，在校验时可以指定参与校验的字段所属的组类别
 定义组（通用）
 为属性设置所属组，可以设置多个
 开启组校验
public interface GroupOne {
}


public String addEmployee(@Validated({GroupOne.class}) Employee employee){
}  

@NotEmpty(message = "姓名不能为空",groups = {GroupOne.class})
private String name;//员工姓名

在这里插入图片描述

四、ssm整合
1、依赖

<?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>com.xingyu</groupId>
    <artifactId>03_springmvc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework</groupId>
                    <artifactId>spring-core</artifactId>
                </exclusion>
            </exclusions>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.23</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>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.9.RELEASE</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.9</version>
        </dependency>
    </dependencies>

 <!--   <profiles>
        <profile>
            <id>env</id>
            <properties>
                <jdbc.url></jdbc.url>
            </properties>
            &lt;!&ndash;设置默认启动&ndash;&gt;
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
        </profile>
    </profiles>-->

    <build>
        <!--<resources>
            <resource>
                &lt;!&ndash;设定配置文件对应的位置目录，支持使用属性动态设定路径&ndash;&gt;
                <directory>${project.basedir}/src/main/resources</directory>
                &lt;!&ndash;开启对配置文件的资源加载过滤&ndash;&gt;
                <filtering>true</filtering>
            </resource>
        </resources>-->
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>80</port>
                    <path>/</path>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2、配置文件

spring.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       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.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--开启bean注解扫描-->
    <context:component-scan base-package="com.xingyu">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置sqlsessionfactorybean-->
    <bean  class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="typeAliasesPackage" value="com.xingyu.pojo"/>
        <property name="dataSource" ref="dataSource"/>
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageInterceptor">
                    <property name="properties">
                        <props>
                            <prop key="helperDialect">mysql</prop>
                            <prop key="reasonable">true</prop>
                        </props>
                    </property>
                </bean>
            </array>
        </property>
    </bean>
    <!--配置包扫描-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.xingyu.mapper"/>
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

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:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.2.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">

    <context:component-scan base-package="com.xingyu.controller"/>
    <mvc:annotation-driven>
        <!--<mvc:message-converters>
            &lt;!&ndash; 处理响应中文内容乱码 &ndash;&gt;
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="defaultCharset" value="UTF-8" />
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html</value>
                        <value>application/json</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>-->
    </mvc:annotation-driven>
    <mvc:default-servlet-handler/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--配置拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**"/>
            <bean class="com.xingyu.interceptor.MyInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>
</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_4_0.xsd"
         version="4.0">

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring.xml</param-value>
    </context-param>
    <!--启动服务器时，通过监听器加载spring运行环境-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <filter>
        <filter-name>CharacterEncodingFilter</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>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>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

mysql配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/db1
jdbc.username=root
jdbc.password=root

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xingyu.mapper.AccountMapper">
    <insert id="save" parameterType="account">
        insert into account(username,password) values (#{account.username},#{account.password})
    </insert>
    <update id="update" parameterType="account">
        update account set password = #{account.password} where username = #{account.username}
    </update>
    <delete id="delete" parameterType="account">
        delete from account where username = #{account.username}
    </delete>
    <select id="get" parameterType="string" resultType="account">
        select * from account where username = #{username}
    </select>
    <select id="findAll" resultType="account">
        select * from account
    </select>
</mapper>

3、模块

mapper
@Mapper
public interface AccountMapper {
    public boolean save(Account user);
    public boolean update(Account user);
    public boolean delete(String username);
    public Account get(String username);
    public List<Account> findAll();
}

services
@Transactional(readOnly = true)
public interface AccountService {
     boolean save(Account user);
     boolean update(Account user);
     boolean delete(String username);
     Account get(String username);
     List<Account> findAll(int page,int size);
}

services
@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    private AccountMapper accountMapper;

    public boolean save(Account account){
        return accountMapper.save(account);
    }
    public boolean update(Account account){
        return accountMapper.update(account);
    }
    public boolean delete(String account){
        return accountMapper.delete(account);
    }
    public Account get(String uuid){
        return accountMapper.get(uuid);
    }
    public List<Account> findAll(int page, int size){
        PageHelper.startPage(1, 2);
        List<Account> all = accountMapper.findAll();
        return all;
    }
}

controller
@RestController
public class TestController {

    @Autowired
    private AccountService accountService;

    @GetMapping(value = "/save",produces = "text/html;charset=utf-8")
    public String save(Model model) {
        List<Account> accounts = accountService.findAll(1, 2);
        model.addAttribute("accounts",accounts);
        int i =1/0;
        return "success";
    }
}

@Component
@ControllerAdvice
public class ExceptionAdvice{
    @ExceptionHandler(Exception.class)
    @ResponseBody
    public HashMap<String, String> doOtherException(Exception ex,
                                                    HttpServletRequest request,
                                                    HttpServletResponse response){
        HashMap<String, String> map = new HashMap<>();
        map.put("异常","数字异常");
        return map;
    }

}
```java
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}

4、注解开发

用注解替代applicationContext.xml

//扫描组件，排除SpringMVC对应的bean，等同于<context:component-scan />
@ComponentScan(value = "com.itheima",excludeFilters = {
    @ComponentScan.Filter(type= FilterType.ANNOTATION,classes = {Controller.class})})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MyBatisConfig.class})
//等同于<tx:annotation-driven transaction-manager="txManager"/>，导入的默认名称为transactionManager
@EnableTransactionManagement
public class SpringConfig {
    //等同于<bean   class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    @Bean("transactionManager")
    public DataSourceTransactionManager getDataSourceTxManager(@Autowired DataSource dataSource){
        DataSourceTransactionManager dtm = new DataSourceTransactionManager();
        //等同于<property name="dataSource" ref="dataSource"/>
        dtm.setDataSource(dataSource);
        return dtm;
    }
}

用注解替代spring-mvc.xml

@Configuration
@ComponentScan("com.itheima.controller")
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {
}

原文地址：https://blog.csdn.net/weixin_45844810/article/details/116196348

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