SpringMVC（三）【REST 风格】（1）https://developer.aliyun.com/article/1534212
1.3.2、标准请求动作注解
经过上一步的简化，我们的 UserController 现在变成了这样：
@RestController @RequestMapping("/users") public class UserController { @RequestMapping(method = RequestMethod.POST) public String save(@RequestBody User user){ System.out.println("user save, name = " + user.getName() + " , age = " + user.getAge()); return "{'module':'user save'}"; } @RequestMapping(value = "/{id}",method = RequestMethod.DELETE) public String delete(@PathVariable Integer id){ System.out.println("user deleted ... user id => " + id); return "{'module': 'user delete'}"; } @RequestMapping(method = RequestMethod.PUT) public String update(@RequestBody User user){ System.out.println("user deleted ... user => " + user.toString()); return "{'module': 'user update'}"; } @RequestMapping(value = "/{id}",method = RequestMethod.GET) public String getById(@PathVariable Integer id){ System.out.println("user get ... user id => " + id); return "{'module': 'user get'}"; } @RequestMapping(method = RequestMethod.GET) public String getAll(){ System.out.println("user get all ..."); return "{'module': 'user get all'}"; } }
现在看起来还是很冗余，我们可以对这些方法的请求行为进行进一步简化，现在这么长的参数太扎眼了，现在我们的代码就变成了这样（把 value = "/{param}" 和 method = RequestMethpd.X 合并到一个注解中）：
@RestController @RequestMapping("/users") public class UserController { @PostMapping public String save(@RequestBody User user){ System.out.println("user save, name = " + user.getName() + " , age = " + user.getAge()); return "{'module':'user save'}"; } @DeleteMapping("/{id}") public String delete(@PathVariable Integer id){ System.out.println("user deleted ... user id => " + id); return "{'module': 'user delete'}"; } @PutMapping public String update(@RequestBody User user){ System.out.println("user deleted ... user => " + user.toString()); return "{'module': 'user update'}"; } @GetMapping("/{id}") public String getById(@PathVariable Integer id){ System.out.println("user get ... user id => " + id); return "{'module': 'user get'}"; } @GetMapping public String getAll(){ System.out.println("user get all ..."); return "{'module': 'user get all'}"; } }
显然一下子变得清新脱俗！舒服多了。
1.4、基于 RESTful 页面数据交互
实体类：
package com.lyh.domain; public class Book { private Integer id; private String type; private String name; private String description; public Book(){} public Book(Integer id, String type, String name, String description) { this.id = id; this.type = type; this.name = name; this.description = description; } @Override public String toString() { return "Book{" + "id=" + id + ", type='" + type + '\'' + ", name='" + name + '\'' + ", description='" + description + '\'' + '}'; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } }
SpringMVC 配置类：
@Configuration @ComponentScan("com.lyh.controller") // 扫描 @EnableWebMvc // 开启 json 转对象的功能等各种格式转换 public class SpringMvcConfig { }
Sevlet 容器配置类：
public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer { protected Class<?>[] getRootConfigClasses() { return new Class[0]; } protected Class<?>[] getServletConfigClasses() { return new Class[]{SpringMvcConfig.class}; } protected String[] getServletMappings() { return new String[]{"/"}; } // 乱码处理 @Override protected Filter[] getServletFilters() { CharacterEncodingFilter filter = new CharacterEncodingFilter(); filter.setEncoding("UTF-8"); return new Filter[]{filter}; } }
BookController 控制器类：
@RestController @RequestMapping("/books") public class BookController { @PostMapping public String save(@RequestBody Book book){ System.out.println("book save ... book => " + book.toString()); return "{'module':'book save'}"; } @GetMapping public List<Book> getAll(){ List<Book> list = new ArrayList<Book>(); list.add(new Book(1,"编程","《图解Spark》","大数据技术")); list.add(new Book(2,"小说","《黄金时代》","王小波著作")); return list; } }
测试：
导入静态资源后访问 localhost:85/pages/boos.html 发现报错找不到映射：No Mapping for GET /pages/books.html 这是因为我们现在的请求都被 SpringMVC 拦截走了，其实这些静态资源应该是由 Tomcat 处理的。
1.4.1、放行非 SpringMVC 请求
上面的问题是对于静态资源的访问，本该是由 Tomcat 处理，但是前面我们在 Servlet 配置类中设置了所有请求都由 SpringMVC 来响应。所以，现在我们需要通过添加一个配置类来实现放行静态资源：
@Configuration public class SpringMvcSupport extends WebMvcConfigurationSupport { @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { // 当访问 /pages/下的资源时,走 /pages 目录下的内容 registry.addResourceHandler("/pages/**").addResourceLocations("/pages/"); registry.addResourceHandler("/js/**").addResourceLocations("/js/"); registry.addResourceHandler("/css/**").addResourceLocations("/css/"); registry.addResourceHandler("/plugins/**").addResourceLocations("/plugins/"); } }
然后，我们需要让 SpringMVC 去加载这个新的配置类：
这样就可以访问到了：
