Spring RestTemplate使用REST principals与HTTP服务器通信。它使用HTTP动词，例如GET、POST、HEAD、PUT、DELETE 等。RestTemplate 提供了不同的通信方法，这些方法将接受 URI 模板、URI 变量、响应类型和请求对象作为参数。
package com.javainterviewpoint;
import java.util.List;
import java.util.Map;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.client.RestTemplate;
public class StudentRestTemplateClient
{
public static final String REST_BASE_URI = "http://localhost:8080";
static RestTemplate restTemplate = new RestTemplate();
/** POST **/
public static void createStudent()
{
Student student = new Student();
student.setId(4);
student.setName("JIP4");
student.setAge(44);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
// headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity<>(student, headers);
restTemplate.postForObject(REST_BASE_URI + "/student", entity, Student.class);
}
/** GET **/
private static void getStudent(int id)
{
Student student = restTemplate.getForObject(REST_BASE_URI + "/student/" + id, Student.class);
System.out.println("**** Student with id : " + id + "****");
System.out
.println("Id :" + student.getId() + " Name : " + student.getName() + " Age : " + student.getAge());
}
public static void getAllStudents()
{
List> studentList = restTemplate.getForObject(REST_BASE_URI + "/students", List.class);
if (studentList != null)
{
System.out.println("**** All Students ****");
for (Map map : studentList)
{
System.out.println(
"Id : id=" + map.get("id") + " Name=" + map.get("name") + " Age=" + map.get("age"));
}
} else
{
System.out.println("No Students exist!!");
}
}
/** PUT **/
public static void updateStudent()
{
Student student = new Student();
student.setId(5);
student.setName("JIP555555");
student.setAge(55);
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity entity = new HttpEntity<>(student, headers);
restTemplate.put(REST_BASE_URI + "/student", entity, Student.class);
}
/** DELETE **/
public static void deleteStudent(int id)
{
restTemplate.delete(REST_BASE_URI + "/student/" + id);
}
public static void main(String args[])
{
createStudent();
getAllStudents();
getStudent(2);
updateStudent();
deleteStudent(5);
}
}
输出 ：
16:29:41.159 [main] DEBUG org.springframework.web.client.RestTemplate - Created POST request for "http://localhost:8080/student"
16:29:41.227 [main] DEBUG org.springframework.web.client.RestTemplate - Setting request Accept header to [application/json, application/*+json]
16:29:41.258 [main] DEBUG org.springframework.web.client.RestTemplate - Writing [Student [id=4, name=JIP4, age=44]] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@91e32e]
16:29:41.402 [main] DEBUG org.springframework.web.client.RestTemplate - POST request for "http://localhost:8080/student" resulted in 204 (null)
16:29:41.404 [main] DEBUG org.springframework.web.client.RestTemplate - Created GET request for "http://localhost:8080/students"
16:29:41.446 [main] DEBUG org.springframework.web.client.RestTemplate - Setting request Accept header to [application/json, application/*+json]
16:29:41.460 [main] DEBUG org.springframework.web.client.RestTemplate - GET request for "http://localhost:8080/students" resulted in 200 (null)
16:29:41.460 [main] DEBUG org.springframework.web.client.RestTemplate - Reading [interface java.util.List] as "application/json;charset=UTF-8" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@91e32e]
**** All Students ****
Id : id=1 Name=JIP1 Age=11
Id : id=2 Name=JIP2 Age=22
Id : id=3 Name=JIP3 Age=33
Id : id=4 Name=JIP4 Age=44
16:29:41.490 [main] DEBUG org.springframework.web.client.RestTemplate - Created GET request for "http://localhost:8080/student/2"
16:29:41.490 [main] DEBUG org.springframework.web.client.RestTemplate - Setting request Accept header to [application/json, application/*+json]
16:29:41.496 [main] DEBUG org.springframework.web.client.RestTemplate - GET request for "http://localhost:8080/student/2" resulted in 200 (null)
16:29:41.497 [main] DEBUG org.springframework.web.client.RestTemplate - Reading [class com.javainterviewpoint.Student] as "application/json;charset=UTF-8" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@91e32e]
**** Student with id : 2****
Id :2 Name : JIP2 Age : 22
16:29:41.498 [main] DEBUG org.springframework.web.client.RestTemplate - Created PUT request for "http://localhost:8080/student"
16:29:41.499 [main] DEBUG org.springframework.web.client.RestTemplate - Writing [Student [id=5, name=JIP555555, age=55]] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@91e32e]
16:29:41.532 [main] DEBUG org.springframework.web.client.RestTemplate - PUT request for "http://localhost:8080/student" resulted in 200 (null)
16:29:41.533 [main] DEBUG org.springframework.web.client.RestTemplate - Created DELETE request for "http://localhost:8080/student/5"
16:29:41.540 [main] DEBUG org.springframework.web.client.RestTemplate - DELETE request for "http://localhost:8080/student/5" resulted in 204 (null)
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