📅  最后修改于: 2020-11-11 05:37:05             🧑  作者: Mango
Rest模板用于创建使用RESTful Web服务的应用程序。您可以使用exchange()方法来使用所有HTTP方法的Web服务。下面给出的代码显示了如何为Rest Template创建Bean,以自动连接Rest Template对象。
package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
}
使用RestTemplate-exchange()方法消耗GET API
假定此URL http:// localhost:8080 / products返回以下JSON,我们将通过使用Rest代码使用以下代码来使用此API响应-
[
{
"id": "1",
"name": "Honey"
},
{
"id": "2",
"name": "Almond"
}
]
您将必须遵循给定的点来使用API-
@RestController
public class ConsumeWebService {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/template/products")
public String getProductList() {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(headers);
return restTemplate.exchange("
http://localhost:8080/products", HttpMethod.GET, entity, String.class).getBody();
}
}
通过使用RestTemplate-exchange()方法消耗POST API
假设此URL http:// localhost:8080 / products返回如下所示的响应,我们将通过使用Rest模板使用此API响应。
下面给出的代码是Request主体-
{
"id":"3",
"name":"Ginger"
}
下面给出的代码是Response主体-
Product is created successfully
您将必须遵循以下给出的要点才能使用API-
自动连接其余模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。在这里,我们包装Product对象以将其发送到请求主体。
提供用于exchange()方法的URL,HttpMethod和Return类型。
@RestController
public class ConsumeWebService {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/template/products", method = RequestMethod.POST)
public String createProducts(@RequestBody Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(product,headers);
return restTemplate.exchange(
"http://localhost:8080/products", HttpMethod.POST, entity, String.class).getBody();
}
}
通过使用RestTemplate-exchange()方法来使用PUT API
假设此URL http:// localhost:8080 / products / 3返回以下响应,我们将通过使用Rest Template使用此API响应。
下面给出的代码是Request body-
{
"name":"Indian Ginger"
}
下面给出的代码是Response主体-
Product is updated successfully
您将必须遵循以下给出的要点才能使用API-
自动连接其余模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。在这里,我们包装Product对象以将其发送到请求主体。
提供用于exchange()方法的URL,HttpMethod和Return类型。
@RestController
public class ConsumeWebService {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/template/products/{id}", method = RequestMethod.PUT)
public String updateProduct(@PathVariable("id") String id, @RequestBody Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(product,headers);
return restTemplate.exchange(
"http://localhost:8080/products/"+id, HttpMethod.PUT, entity, String.class).getBody();
}
}
通过使用RestTemplate消耗DELETE API-exchange()方法
假设此URL http:// localhost:8080 / products / 3返回下面给出的响应,我们将通过使用Rest Template使用此API响应。
下面显示的这一行代码是Response主体-
Product is deleted successfully
您将必须遵循以下显示的要点才能使用API-
自动连接其余模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。
提供用于exchange()方法的URL,HttpMethod和Return类型。
@RestController
public class ConsumeWebService {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/template/products/{id}", method = RequestMethod.DELETE)
public String deleteProduct(@PathVariable("id") String id) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(headers);
return restTemplate.exchange(
"http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody();
}
}
完整的Rest Template Controller类文件在下面给出-
package com.tutorialspoint.demo.controller;
import java.util.Arrays;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import com.tutorialspoint.demo.model.Product;
@RestController
public class ConsumeWebService {
@Autowired
RestTemplate restTemplate;
@RequestMapping(value = "/template/products")
public String getProductList() {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(headers);
return restTemplate.exchange(
"http://localhost:8080/products", HttpMethod.GET, entity, String.class).getBody();
}
@RequestMapping(value = "/template/products", method = RequestMethod.POST)
public String createProducts(@RequestBody Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(product,headers);
return restTemplate.exchange(
"http://localhost:8080/products", HttpMethod.POST, entity, String.class).getBody();
}
@RequestMapping(value = "/template/products/{id}", method = RequestMethod.PUT)
public String updateProduct(@PathVariable("id") String id, @RequestBody Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(product,headers);
return restTemplate.exchange(
"http://localhost:8080/products/"+id, HttpMethod.PUT, entity, String.class).getBody();
}
@RequestMapping(value = "/template/products/{id}", method = RequestMethod.DELETE)
public String deleteProduct(@PathVariable("id") String id) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity entity = new HttpEntity(headers);
return restTemplate.exchange(
"http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody();
}
}
下面给出了Spring Boot应用程序类– DemoApplication.java的代码-
package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
下面给出了Maven构建的代码– pom.xml-
4.0.0
com.tutorialspoint
demo
0.0.1-SNAPSHOT
jar
demo
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
1.5.8.RELEASE
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter-web
org.springframework.boot
spring-boot-starter-test
test
org.springframework.boot
spring-boot-maven-plugin
下面给出了Gradle Build – build.gradle的代码-
buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
您可以创建一个可执行的JAR文件,并使用以下Maven或Gradle命令运行Spring Boot应用程序-
对于Maven,您可以使用下面给出的命令-
mvn clean install
在“ BUILD SUCCESS”之后,您可以在目标目录下找到JAR文件。
对于Gradle,您可以使用下面显示的命令-
gradle clean build
在“ BUILD SUCCESSFUL”之后,您可以在build / libs目录下找到JAR文件。
现在,使用以下命令运行JAR文件:
java –jar
现在,该应用程序已在Tomcat端口8080上启动。
现在,在POSTMAN应用程序中单击以下URL,您可以看到输出。
通过其余模板获取产品-http:// localhost:8080 / template / products
创建产品POST- http:// localhost:8080 / template / products
更新产品PUT- http:// localhost:8080 / template / products / 3
删除产品-http:// localhost:8080 / template / products / 3