Scenes
Ruoyi's front-end and back-end separated version will teach you step by step how to set up the environment and run the project locally:
Based on the SpringBoot project built above, and after introducing the required dependencies such as fastjson, hutool, lombok, etc. into the project.
The system needs to connect to the third-party http interface to obtain the returned data, and parse the json data into entity classes for subsequent business processing.
Note:
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accomplish
1. Use the interface mock tool to simulate an http interface, such as using apifox
For example, the data returned by the interface here is
{
"code": "200",
"data": [
{
"id": "38",
"name": "成生认两",
"time_cur": "1984-01-29 17:55:39",
"地址": "mollit"
},
{
"id": "61",
"name": "质立红几算往值",
"time_cur": "2013-01-27 06:38:34",
"地址": "est enim"
},
{
"id": "53",
"name": "办单正决风放",
"time_cur": "2008-10-18 14:00:37",
"地址": "ex commodo nisi"
},
{
"id": "54",
"name": "角件二心任眼",
"time_cur": "1978-11-14 10:13:04",
"地址": "nisi exercitation quis voluptate"
}
]
}Then mock, the effect is:
2. Initiate http client request here using hutool’s HttpUtil
The above interface deliberately adds a field with the Chinese name "address" because the third-party system returns the interface data like this, and other fields can correspond to the fields returned in the interface.
Then the time field returned in the interface is a string, which is used when creating a new entity class.
@JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")The annotation can parse the time string into a Date attribute field.
3. Create a new interface data response DTO to accept the interface response and determine the code field, etc.
import com.alibaba.fastjson.JSONArray;
import lombok.Data;
import java.io.Serializable;
@Data
public class UserResDTO implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 响应编码
*/
private Integer code;
/**
* 数据
*/
private JSONArray data;
}The interface data here is returned as the data field, so the new JSONArray type is received.
Then you need to parse the data in the data field into a list of objects.
Create a new UserDTO to parse the required data
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.Data;
import java.util.Date;
@Data
public class UserDTO {
private String id;
private String name;
@JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss")
private Date time_cur;
private String 地址;
private String remark;
}4. Create a new test class
Call the toJavaList method of JSONArray to parse the data into a Java list object
import cn.hutool.http.HttpRequest;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.system.domain.test.dto.UserDTO;
import com.ruoyi.system.domain.test.dto.UserResDTO;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = RuoYiApplication.class,webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class FastJsonTest {
@Test
public void getUserData() {
String body = "";
try {
body = HttpRequest
.get("http://127.0.0.1:4523/m1/2858210-0-default/testFastJson")
.timeout(20000)
.execute()
.body();
UserResDTO userResDTO = JSON.parseObject(body, UserResDTO.class);
if (userResDTO.getCode() != null && 200!=userResDTO.getCode()) {
//错误处理
}else {
JSONArray data = userResDTO.getData();
if (StringUtils.isEmpty(data)) {
return;
}
List<UserDTO> userDTOS = data.toJavaList(UserDTO.class);
System.out.println(userDTOS.toString());
}
} catch (Exception e) {
}
}
}
Run the unit test and view the parsing results
