SpringMvc学习笔记五

Restful 风格路由

1. 配置类

1.1、SpringMvcConfig配置类

@Configuration
@ComponentScan({"com.itheima.controller", "com.itheima.config"})   方式1.2 添加com.itheima.config 扫描目录
@EnableWebMvc
public class SpringMvcConfig {
}

1.2、ServletContainerInitConfig类

public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {


    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[0];
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }


    // 乱码处理 过滤器
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter filter = new CharacterEncodingFilter();
        filter.setEncoding("UTF-8");
        return new Filter[]{filter};
    }
}

1.3、SpringMvcSupport配置类

@Configuration  //方式1.1 添加Configuration注解
public class SpringMvcSupport extends WebMvcConfigurationSupport {
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        // 当访问 /pages的时候 ，走pages目录下访问 不要走mvc
        registry.addResourceHandler("/pages/**").addResourceLocations("/pages/");
    }
}

• 这个类的主要作用 添加静态资源排除，让这些路径 不会进入SpringMvc动态请求里面

2. 控制器

2.1、 Restful 风格 增删改查

@RestController
@RequestMapping("/books")
public class BookController {

    @PostMapping
    public String save(@RequestBody Book book){
        System.out.println("book save ==>" + book);
        return "{'module':'book save success'}";
    }

    @GetMapping
    public List<Book> getAll(){
        Book book1 = new Book();
        book1.setType("计算机");
        book1.setName("SpringMVC入门教程");
        book1.setDescription("小试牛刀");


        Book book2 = new Book();
        book2.setType("计算机");
        book2.setName("SpringMVC项目实战");
        book2.setDescription("一代总是");

        List<Book> bookList = new ArrayList<>();
        bookList.add(book1);
        bookList.add(book2);


        return bookList;
    }

    @DeleteMapping("/{id}")
    public String delete(@PathVariable Integer id){
        System.out.println("book delete id = "+ id);
        return "{'module':'book delete success'}";
    }


    @PutMapping
    public String update(@RequestBody Book book){
        System.out.println("book update book = "+ book);
        return "{'module':'book update success'}";
    }
}

• @RestController 声明为Rest风格控制器

• @RequestMapping("/books") 路径

• @PostMapping Post请求

• @GetMapping Get请求

• @DeleteMapping("/{id}") Delete请求

• @PutMapping Put请求

• Json格式参数必须加上@ReqeustBody 注解