读 Spring Boot实战笔记--day004

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其他配置

viewController 配置：

package com.example.springboot.mvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author: hyh
 * @Date: 2021/11/15 16:27
 **/
@Controller
public class ControllerH {

    // 通过ModelAttribute 注解获取参数 msg
    @GetMapping("index")
    public void index(@ModelAttribute("msg") String msg){
    }

    // 跳转主页面 可以配置在是视图配置里
    @RequestMapping("/index")
    public String toIndex(){
        return "index";
    }
}

package com.example.springboot.mvc;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

/**
 * @Author: hyh
 * @Date: 2021/11/15 15:12
 **/
@Configuration
@EnableWebMvc // 开启 webmvc
public class MyMvcConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //addResourceLocations 指的是文件放置的目录，addResourceHandler指的是对外暴露的访问路径。
        registry.addResourceHandler("/assets/**").addResourceLocations("class:/assets/");
    }

    @Bean
    public MyInterceptor interceptor(){
        return new MyInterceptor();
    }

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("WEB-INF/class/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }

    //  拦截所有请求
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor());
    }

    // 直接配置在视图配置里
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("index").setViewName("index");
    }
}

路径匹配参数配置：
在 Spring MVC 中，路径参数如果带“.”的话，“.”后面的值将被忽略，例如，访问http://localhost:8080/highlight _springmvc4/anno/pathvar/xx.yy，此时“.”后面的yy被忽略，如图4-10所示。

通过重写configurePathMatch方法可不忽略“.”后面的参数，代码如下:

package com.example.springboot.mvc;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

/**
 * @Author: hyh
 * @Date: 2021/11/15 15:12
 **/
@Configuration
@EnableWebMvc // 开启 webmvc
public class MyMvcConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //addResourceLocations 指的是文件放置的目录，addResourceHandler指的是对外暴露的访问路径。
        registry.addResourceHandler("/assets/**").addResourceLocations("class:/assets/");
    }

    @Bean
    public MyInterceptor interceptor(){
        return new MyInterceptor();
    }

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("WEB-INF/class/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }

    //  拦截所有请求
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor());
    }

    // 直接配置在视图配置里
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("index").setViewName("index");
    }

    // 重写方法 不过滤 .
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        configurer.setUseSuffixPatternMatch(false);
    }
}

文件上传配置：
文件上传是一个项目里经常要用的功能，Spring MVC通过配置一个MultipartResolver来上传文件。在 Spring 的控制器中，通过 MultipartFile file来接收文件，通过MultipartFile[]files接收多个文件上传。

(1）添加文件上传依赖。
  <!-- file upload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!--非必需,可简化1/O操作-->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.3</version>
    </dependency>
</dependencies>

// 前台代码  post 请求  upload 路径
<div class-"upload">
    <form action="upload" enctype="multipart/form-data" method="post">
        <input type-"file" name="file"/><br/>
        <input type=" submit" value="上传">
    </form>
</div>

package com.example.springboot.mvc;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

/**
 * @Author: hyh
 * @Date: 2021/11/15 16:27
 **/
@Controller
public class ControllerH {

    @PostMapping("/upload")
    @ResponseBody
    public String upload(MultipartFile file){
        // 编写上传逻辑
        return "ok";
    }
}
package com.example.springboot.mvc;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

/**
 * @Author: hyh
 * @Date: 2021/11/15 15:12
 **/
@Configuration
@EnableWebMvc // 开启 webmvc
public class MyMvcConfig implements WebMvcConfigurer {

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //addResourceLocations 指的是文件放置的目录，addResourceHandler指的是对外暴露的访问路径。
        registry.addResourceHandler("/assets/**").addResourceLocations("class:/assets/");
    }

    @Bean
    public MyInterceptor interceptor(){
        return new MyInterceptor();
    }

    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("WEB-INF/class/views/");
        resolver.setSuffix(".jsp");
        resolver.setViewClass(JstlView.class);
        return resolver;
    }

    //  拦截所有请求
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(interceptor());
    }

    // 直接配置在视图配置里
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("index").setViewName("index");
        // 调用 toUpload 会转到 upload 方法
        registry.addViewController("toUpload").setViewName("upload");
    }

    // 重写方法
    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) {
        configurer.setUseSuffixPatternMatch(false);
    }
    // 配置 bean 对象
    @Bean
    public MultipartResolver multipartResolver(){
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        // 文件最大为 10M
        resolver.setMaxUploadSize(10 * 1024 * 1024);
        return resolver;
    }
}