通過簡單的增刪改查知道了spring data rest 的基本語法,那麼帶入一些真實環境來實現一些用例。
一、密碼一欄的信息不想讓用戶看到。
在user實體類中增加
@JsonIgnore
private String password;
http://localhost:8081/api/user/2
返回結果:
{
"name": "李四",
"age": 25,
"sex": "男",
"datatime": "2020-02-20 01:52:26",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/2"
},
"user": {
"href": "http://localhost:8081/api/user/2"
}
}
}
二、組合輸出用戶姓名、性別、年齡。
新增一個接口:
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.rest.core.config.Projection;
import test.entity.User;
@Projection(name="list",types=User.class)
public interface userList {
@Value("#{target.name},年齡:#{target.age},性別:#{target.sex}")
public String getFullInfo();
}
輸入 http://localhost:8081/api/user?projection=list
或
將該接口配置在UserRepository上。
package test.dao;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import test.entity.User;
/**
* path="user": 映射路由
* excerptProjection 映射接口
* User:實體類
* Long:主鍵
* @author white
*
*/
@RepositoryRestResource(path="user",excerptProjection=userList.class)
public interface UserRepository extends JpaRepository<User, Integer>{
}
輸入http://localhost:8081/api/user
返回內容:(如果輸入http://localhost:8081/api/user/2,顯示不出這個組合字段)
{
"_embedded": {
"users": [
{
"fullInfo": "張三,年齡:16,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/1"
},
"user": {
"href": "http://localhost:8081/api/user/1{?projection}",
"templated": true
}
}
},
{
"fullInfo": "李四,年齡:25,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/2"
},
"user": {
"href": "http://localhost:8081/api/user/2{?projection}",
"templated": true
}
}
},
{
"fullInfo": "王五,年齡:32,性別:女",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/3"
},
"user": {
"href": "http://localhost:8081/api/user/3{?projection}",
"templated": true
}
}
}
]
},
"_links": {
"self": {
"href": "http://localhost:8081/api/user{?page,size,sort,projection}",
"templated": true
},
"profile": {
"href": "http://localhost:8081/api/profile/user"
}
},
"page": {
"size": 20,
"totalElements": 3,
"totalPages": 1,
"number": 0
}
}
三、查找姓名爲張三的信息
在UserRepository配置如下內容:
@RestResource(path="name",rel="name")
public String findByName(@Param("name") int name);
輸入http://localhost:8081/api/user/search/name?name=張三
返回結果:
{
"name": "張三",
"age": 16,
"sex": "男",
"datatime": "2020-02-03 01:52:14",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/1"
},
"user": {
"href": "http://localhost:8081/api/user/1{?projection}",
"templated": true
}
}
}
這裏有兩個問題:1.爲什麼請求的url要加上search?2.爲什麼方法名必須是findByName?
按照Spring Data的規範的規定,查詢方法以find | read | get開頭(比如 find、findBy、read、readBy、get、getBy),涉及查詢條件時,條件的屬性用條件關鍵字連接,要注意的是:條件屬性以首字母大寫。框架在進行方法名解析時,會先把方法名多餘的前綴截取掉,然後對剩下部分進行解析。
jpa命名規範請參考:點擊這裏。
四、查詢一個姓張的信息。
在UserRepository配置如下內容:
@RestResource(path="like",rel="nameStartsWith")
public List<User> findByNameStartsWith(@Param("name") String name);
輸入:http://localhost:8081/api/user/search/like?name=張
返回結果:
{
"_embedded": {
"users": [
{
"fullInfo": "張三,年齡:16,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/1"
},
"user": {
"href": "http://localhost:8081/api/user/1{?projection}",
"templated": true
}
}
}
]
},
"_links": {
"self": {
"href": "http://localhost:8081/api/user/search/like?name=%E5%BC%A0"
}
}
}
五、查詢一個姓名爲張三,性別爲男的信息。
在UserRepository配置如下內容:
@RestResource(path="more",rel="nameAndSex")
public List<User> findByNameAndSex(@Param("name") String name,@Param("sex") String sex);
輸入:http://localhost:8081/api/user/search/more?name=張三&sex=男
返回結果:
{
"_embedded": {
"users": [
{
"fullInfo": "張三,年齡:16,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/1"
},
"user": {
"href": "http://localhost:8081/api/user/1{?projection}",
"templated": true
}
}
}
]
},
"_links": {
"self": {
"href": "http://localhost:8081/api/user/search/more?sex=%E7%94%B7&name=%E5%BC%A0%E4%B8%89"
}
}
}
六、將性別爲男的信息按年齡排序輸出。
在UserRepository配置如下內容:
@RestResource(path="ageDesc",rel="ageDesc")
public List<User> findBySexOrderByAgeDesc(@Param("sex") String sex);
輸入:http://localhost:8081/api/user/search/ageDesc?sex=男
返回結果:
{
"_embedded": {
"users": [
{
"fullInfo": "李四,年齡:25,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/2"
},
"user": {
"href": "http://localhost:8081/api/user/2{?projection}",
"templated": true
}
}
},
{
"fullInfo": "張三,年齡:16,性別:男",
"_links": {
"self": {
"href": "http://localhost:8081/api/user/1"
},
"user": {
"href": "http://localhost:8081/api/user/1{?projection}",
"templated": true
}
}
}
]
},
"_links": {
"self": {
"href": "http://localhost:8081/api/user/search/ageDesc?sex=%E7%94%B7&%E5%BC%A0%E4%B8%89"
}
}
}