深入SpringMVC组件开发【2】

一、常用注解

1.@PageableDefault分页注解

@RequestMapping(value = "/user", method = RequestMethod.GET)
public List<User> query(UserQueryCondition condition,@PageableDefault(page = 2, size = 17, sort = "username, asc") Pageable pageable){
    System.out.println(ReflectionToStringBuilder.toString(condition, ToStringStyle.MULTI_LINE_STYLE));
    System.out.println(pageable.getPageSize());
    System.out.println(pageable.getPageNumber());
    System.out.println(pageable.getSort());

    List<User> userList = new ArrayList<User>();
    userList.add(new User());
    userList.add(new User());
    userList.add(new User());
    return userList;
}

2.@PathVariable中限制参数类型---正则表达式

例：限制id只能是数字

@RequestMapping(value = "/user/{id:\\d+}", method = RequestMethod.GET)
public User getInfo(@PathVariable("id") String id){
    User user = new User();
    user.setUsername("tom");
    return user;
}

3.@JsonView指定视图

①使用接口来声明多个视图

②在值对象的get方法上指定视图

③在Controller方法上指定视图

需求：在查询用户列表时不展示密码，但是在展示单一用户详情时展示密码。

实现：①在实体类中声明视图接口，并在字段上定义所属视图；

②在Controller的方法上声明视图。

public class User {

    public interface UserSimpleView {};
    public interface UserDetailView extends UserSimpleView {};

    @JsonView(UserSimpleView.class)
    private String username;

    @JsonView(UserDetailView.class)
    private String password;

    /** getter/setter **/
}

@RequestMapping(value = "/user", method = RequestMethod.GET)
@JsonView(User.UserSimpleView.class)
public List<User> query(UserQueryCondition condition,@PageableDefault(page = 2, size = 17, sort = "username, asc") Pageable pageable){
    System.out.println(ReflectionToStringBuilder.toString(condition, ToStringStyle.MULTI_LINE_STYLE));
    List<User> userList = new ArrayList<User>();
    userList.add(new User());
    userList.add(new User());
    userList.add(new User());
    return userList;
}

4.日期类型参数的处理

前台展示的时间格式多样化，同时受到前后端分离思想的指导，在时间的传递格式上选择时间戳的传递。

不管是前端还是后端，都可以方便的进行时间与时间戳的互相转换。

public class User {
    private Date birthday;
    /** getter/setter **/
}

@PostMapping(value = "/user")
public User create(@RequestBody User user){
    System.out.println(user.getBirthday());//Thu Jan 04 16:59:21 CST 2018
    return user;

@Test
public void whenCreateSuccess() throws Exception {
    Date date = new Date();
    System.out.println(date.getTime()); //时间戳1515056361751
    String content = "{\"birthday\":"+date.getTime()+"}";

    String result = mockMvc.perform(post("/user")
    .contentType(MediaType.APPLICATION_JSON_UTF8)
    .content(content))
            .andExpect(status().isOk())
            .andReturn().getResponse().getContentAsString();
    System.out.println(result);//{"birthday":1515056361751}
}

深入SpringMVC组件开发【2】

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