Spring Boot Rest模板

Rest模板用于创建使用RESTful Web服务的应用程序。使用exchange()方法为所有HTTP方法使用Web服务。下面给出的代码显示了如何创建Rest模板Bean以自动连接Rest模板对象。

package com.yiibai.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(); } }

GET

通过使用RestTemplate类的exchange()方法来使用GET API，
假设此URL => http://localhost:8080/products返回以下JSON，将使用以下代码使用Rest Template来使用此API响应 -

[
   {
      "id": "1", "name": "Honey" }, { "id": "2", "name": "Almond" } ]

必须遵循给定的点来使用API -

自动装配Rest模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。
为Exchange()方法提供URL，HttpMethod和Return类型。

@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 <String> entity = new HttpEntity<String>(headers); return restTemplate.exchange(" http://localhost:8080/products", HttpMethod.GET, entity, String.class).getBody(); } }

POST

通过使用RestTemplate的exchange()方法来使用POST API

假设此URL => http://localhost:8080/products返回如下所示的响应，使用Rest模板测试此API响应。

下面给出的代码是请求正文 -

{
   "id":"3", "name":"Ginger" }

下面给出的代码是响应内容 -

Product is created successfully

需要遵循以下给出的要点来使用API -

自动装配Rest模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。在这里将Product对象包装起来以将其发送到请求主体。

为exchange()方法提供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<Product> entity = new HttpEntity<Product>(product,headers); return restTemplate.exchange( "http://localhost:8080/products", HttpMethod.POST, entity, String.class).getBody(); } }

PUT

通过使用RestTemplate的exchange()方法来使用PUT API。

假设此URL=> http://localhost:8080/products/3返回以下响应，使用RestTemplate来响应此API。

下面给出的代码是请求主体 -

{
   "name":"Huawei"
}

下面给出的代码是响应结果 -

Product is updated successfully

必须遵循以下给出的要点来使用API -

自动装配Rest模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。在这里将Product对象包装起来以将其发送到请求主体。

exchange()方法提供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<Product> entity = new HttpEntity<Product>(product,headers); return restTemplate.exchange( "http://localhost:8080/products/"+id, HttpMethod.PUT, entity, String.class).getBody(); } }

DELETE

通过使用RestTemplate的 exchange()方法来使用DELETE API

假设此URL => http://localhost:8080/products/3返回下面给出的响应，将使用RestTemplate来使用此API响应。

下面显示的这行代码是响应正文 -

Product is deleted successfully

必须按照下面显示的点来使用API -

自动装配Rest模板对象。
使用HttpHeaders设置请求标头。
使用HttpEntity包装请求对象。

为exchange()方法提供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<Product> entity = new HttpEntity<Product>(headers); return restTemplate.exchange( "http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody(); } }

完整的Rest Template控制器类文件如下 -

package com.yiibai.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.yiibai.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<String> entity = new HttpEntity<String>(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<Product> entity = new HttpEntity<Product>(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<Product> entity = new HttpEntity<Product>(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<Product> entity = new HttpEntity<Product>(headers); return restTemplate.exchange( "http://localhost:8080/products/"+id, HttpMethod.DELETE, entity, String.class).getBody(); } }

Spring Boot应用程序类 - DemoApplication.java 的代码如下 -

package com.yiibai.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); } }

Maven构建文件- pom.xml 的代码如下 -

<?xml version = "1.0" encoding = "UTF-8"?>
<project xmlns = "http://maven.apache.org/POM/4.0.0" 
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 
   http://maven.apache.org/xsd/maven-4.0.0.xsd">

   <modelVersion>4.0.0</modelVersion> <groupId>com.yiibai</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.8.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

Gradle构建文件 - build.gradle 的代码如下 -

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.yiibai'
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')
}

创建可执行的JAR文件，并使用以下Maven或Gradle命令运行Spring Boot应用程序:

对于Maven，使用下面给出的命令 -

mvn clean install

在“BUILD SUCCESS”之后，可以在target目录下找到JAR文件。

对于Gradle，使用下面显示的命令 -

gradle clean build

在“BUILD SUCCESSFUL”之后，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 <JARFILE>

现在，应用程序已在Tomcat端口8080上启动。

现在点击POSTMAN 应用程序中的以下URL，可以看到输出。
通过Rest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 DELETE - http://localhost:8080/template/products/3

GET

POST

PUT

DELETE

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