Question

我已实施此示例Retrieving JSON data via HTTP GET

Json的反应是这样的：

{"employees":[{"personName":"Albert","personSurname":"1stein","personNumber":"1","personMobile":"5555555","personId":"1234567890","personCompanyCode":"CC01"},
{"personName":"Albert","personSurname":"2stein","personNumber":"2","personMobile":"5555556","personId":"1234567891","personCompanyCode":"CC01"},
{"personName":"Albert","personSurname":"2stein","personNumber":"3","personMobile":"5555557","personId":"1234567892","personCompanyCode":"CC01"},
{"personName":"Albert","personSurname":"4stein","personNumber":"4","personMobile":"5555558","personId":"1234567893","personCompanyCode":"CC01"},
{"personName":"Albert","personSurname":"5stein","personNumber":"5","personMobile":"5555559","personId":"1234567894","personCompanyCode":"CC01"}],
"result":true,"message":"OK"}

我无法使用StringHttpMessageConverter因为我的数据很庞大（200,000名员工）它给了我一个 OutOfMemoryError 。

我想直接从json中检索这些数据，如示例所示，但它给了我 406不可接受的错误。

myClass.java：

public class MyClass { private String personName; private String
personSurname; .. ..

(Setters and Getters) .. ..


}

我尝试了以下方法，但没有区别：

restTemplate.exchange(targetUrl, HttpMethod.GET, requestEntity, myClass.class)

或

restTemplate.exchange(targetUrl, HttpMethod.GET, requestEntity, myClass[].class)

从这个json获取myClass对象的正确方法是什么？

Answer 1

您正在尝试直接获取子节点，而不是通过父节点。默认情况下，Rest模板尝试将响应JSON数据转换为指定的类，如果在您的情况下不喜欢则会抛出错误。

这是员工类

d = (X1 - X2)^2 + (Y1 - Y2)^2
for i=1 to N-1 do:
  for j=i+1 to n do:
     t = (Xi - Xj)^2 + (Yi - Yj)^2
     if (t < d) then d = t
return d

这是包含您的JSON响应的父类

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"personName",
"personSurname",
"personNumber",
"personMobile",
"personId",
"personCompanyCode"
})
public class Employee {

@JsonProperty("personName")
private String personName;
@JsonProperty("personSurname")
private String personSurname;
@JsonProperty("personNumber")
private String personNumber;
@JsonProperty("personMobile")
private String personMobile;
@JsonProperty("personId")
private String personId;
@JsonProperty("personCompanyCode")
private String personCompanyCode;

@JsonProperty("personName")
public String getPersonName() {
return personName;
}

@JsonProperty("personName")
public void setPersonName(String personName) {
this.personName = personName;
}

@JsonProperty("personSurname")
public String getPersonSurname() {
return personSurname;
}

@JsonProperty("personSurname")
public void setPersonSurname(String personSurname) {
this.personSurname = personSurname;
}

@JsonProperty("personNumber")
public String getPersonNumber() {
return personNumber;
}

@JsonProperty("personNumber")
public void setPersonNumber(String personNumber) {
this.personNumber = personNumber;
}

@JsonProperty("personMobile")
public String getPersonMobile() {
return personMobile;
}

@JsonProperty("personMobile")
public void setPersonMobile(String personMobile) {
this.personMobile = personMobile;
}

@JsonProperty("personId")
public String getPersonId() {
return personId;
}

@JsonProperty("personId")
public void setPersonId(String personId) {
this.personId = personId;
}

@JsonProperty("personCompanyCode")
public String getPersonCompanyCode() {
return personCompanyCode;
}

@JsonProperty("personCompanyCode")
public void setPersonCompanyCode(String personCompanyCode) {
this.personCompanyCode = personCompanyCode;
}

}

在这种情况下，您的休息呼叫应如下

import java.util.List;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
"employees",
"result",
"message"
})
public class EmployeeDataResponse {

@JsonProperty("employees")
private List<Employee> employees = null;
@JsonProperty("result")
private Boolean result;
@JsonProperty("message")
private String message;

@JsonProperty("employees")
public List<Employee> getEmployees() {
return employees;
}

@JsonProperty("employees")
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}

@JsonProperty("result")
public Boolean getResult() {
return result;
}

@JsonProperty("result")
public void setResult(Boolean result) {
this.result = result;
}

@JsonProperty("message")
public String getMessage() {
return message;
}

@JsonProperty("message")
public void setMessage(String message) {
this.message = message;
}

}

如果您需要澄清答案，请告诉我。

Android Spring Rest Client＆＃34; exchange＆＃34;创建类（406不可接受）

1 个答案: