本章是实现一个Helloworld的通过访问下面网站，获取到json数据。
http://localhost:8080/greeting {"id":1,"content":"Hello, World!"} //如果输入name,则替换world http://localhost:8080/greeting?name=User {"id":1,"content":"Hello, User!"}下载这个地址的 https://github.com/spring-guides/gs-rest-service
然后执行 gradlew bootRun ///也可 gradlew build
///也可 gradlew build 成一个JAR文件
./mvnw spring-boot:run //gradlew bootRun
./mvnw clean package //gradlew build
java -jar target/gs-rest-service-0.1.0.jar本章没有使用任何编辑器。只是下载了源码，并执行了一次。
package hello; import java.util.concurrent.atomic.AtomicLong; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController public class GreetingController { private static final String template = "Hello, %s!"; private final AtomicLong counter = new AtomicLong(); @RequestMapping("/greeting") public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) { return new Greeting(counter.incrementAndGet(), String.format(template, name)); } } package hello; public class Greeting { private final long id; private final String content; public Greeting(long id, String content) { this.id = id; this.content = content; } public long getId() { return id; } public String getContent() { return content; } } package hello; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } } /* * Copyright 2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * https://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package hello; import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get; import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print; import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath; import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import org.springframework.test.web.servlet.MockMvc; @RunWith(SpringRunner.class) @SpringBootTest @AutoConfigureMockMvc public class GreetingControllerTests { @Autowired private MockMvc mockMvc; @Test public void noParamGreetingShouldReturnDefaultMessage() throws Exception { this.mockMvc.perform(get("/greeting")).andDo(print()).andExpect(status().isOk()) .andExpect(jsonPath("$.content").value("Hello, World!")); } @Test public void paramGreetingShouldReturnTailoredMessage() throws Exception { this.mockMvc.perform(get("/greeting").param("name", "Spring Community")) .andDo(print()).andExpect(status().isOk()) .andExpect(jsonPath("$.content").value("Hello, Spring Community!")); } }
