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SpringMVCjsonView注解笔记-创新互联
需求：
由于平时会写一些数据返回到前端，然而往往的情况是：
仅仅需要部分的字段属性，所以有时就得做一些操作保证只返回所需要的字段
特别是 针对手机端的接口或者其他走HTTP协议的接口需要对象内部分属性
方案：
利用@JsonView注解很方便的搞掂这事. 他可以控制输出我们想要序列化的字段属性
且简单易用易懂
public class View {
interface Summary {}
}
public class User {
@JsonView(View.Summary.class)
private Long id;
@JsonView(View.Summary.class)
private String firstname;
@JsonView(View.Summary.class)
private String lastname;
private String email;
private String address;
private String postalCode;
private String city;
private String country;
}
public class Message {
@JsonView(View.Summary.class)
private Long id;
@JsonView(View.Summary.class)
private LocalDate created;
@JsonView(View.Summary.class)
private String title;
@JsonView(View.Summary.class)
private User author;
private List recipients;
private String body;
} @RestController
public class MessageController {
@Autowired
private MessageService messageService;
@RequestMapping("/")
public List getAllMessages() {
return messageService.getAll();
}
@RequestMapping("/{id}")
public Message getMessage(@PathVariable Long id) {
return messageService.get(id);
}
} 在上面的实例中，只有getAllMessages()这个方法有@JsonView(View.Summary.class)注解，所以它的请求只会出现被注解标注要序列化的字段属性
响应的结果: 只会出现被注解的属性
[ {
"id" : 1,
"created" : "2014-11-14",
"title" : "Info",
"author" : {
"id" : 1,
"firstname" : "Brian",
"lastname" : "Clozel"
}}, {
"id" : 2,
"created" : "2014-11-14",
"title" : "Warning",
"author" : {
"id" : 2,
"firstname" : "Stéphane",
"lastname" : "Nicoll"
}}, {
"id" : 3,
"created" : "2014-11-14",
"title" : "Alert",
"author" : {
"id" : 3,
"firstname" : "Rossen",
"lastname" : "Stoyanchev"
}} ]而如果调用 getMessage(@PathVariable Long id) 这个方法 则返回的数据结果：
所有的Message所有的字段属性
{
"id" : 1,
"created" : "2014-11-14",
"title" : "Info",
"body" : "This is an information message",
"author" : {
"id" : 1,
"firstname" : "Brian",
"lastname" : "Clozel",
"email" : "bclozel@pivotal.io",
"address" : "1 Jaures street",
"postalCode" : "69003",
"city" : "Lyon",
"country" : "France"
},
"recipients" : [ {
"id" : 2,
"firstname" : "Stéphane",
"lastname" : "Nicoll",
"email" : "snicoll@pivotal.io",
"address" : "42 Obama street",
"postalCode" : "1000",
"city" : "Brussel",
"country" : "Belgium"
}, {
"id" : 3,
"firstname" : "Rossen",
"lastname" : "Stoyanchev",
"email" : "rstoyanchev@pivotal.io",
"address" : "3 Warren street",
"postalCode" : "10011",
"city" : "New York",
"country" : "USA"
} ]}另外 @JsonView注解也是支持继承的
public class View {
interface Summary {}
interface SummaryWithRecipients extends Summary {}
}
public class Message {
@JsonView(View.Summary.class)
private Long id;
@JsonView(View.Summary.class)
private LocalDate created;
@JsonView(View.Summary.class)
private String title;
@JsonView(View.Summary.class)
private User author;
@JsonView(View.SummaryWithRecipients.class)
private List recipients;
private String body;
}
@RestController
public class MessageController {
@Autowired
private MessageService messageService;
@JsonView(View.SummaryWithRecipients.class)
@RequestMapping("/with-recipients")
public List getAllMessagesWithRecipients() {
return messageService.getAll();
}
} 结果中多了recipients属性
{
"id" : 1,
"created" : "2014-11-14",
"title" : "Info",
"body" : "This is an information message",
"author" : {
"id" : 1,
"firstname" : "Brian",
"lastname" : "Clozel",
},
"recipients": [ {
"id" : 2,
"firstname" : "Stéphane",
"lastname" : "Nicoll",
}, {
"id" : 3,
"firstname" : "Rossen",
"lastname" : "Stoyanchev",
} ]}创新互联www.cdcxhl.cn，专业提供香港、美国云服务器，动态BGP最优骨干路由自动选择，持续稳定高效的网络助力业务部署。公司持有工信部办法的idc、isp许可证， 机房独有T级流量清洗系统配攻击溯源，准确进行流量调度，确保服务器高可用性。佳节活动现已开启，新人活动云服务器买多久送多久。
新闻标题：SpringMVCjsonView注解笔记-创新互联
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