一般 HTTP 客户端会通过 POST 方法向 HTTP 发送 JSON 数据。本文学习下如何解析。
示例
项目结构
.
├── build.gradle
└── src
└── main
├── java
│ └── hello
│ ├── Application.java
│ ├── BaseResponse.java
│ ├── GreetingController.java
│ ├── GreetingRequest.java
│ └── GreetingResponse.java
└── resources
build.gradle
buildscript {
repositories {
maven { url 'http://mirrors.cloud.tencent.com/nexus/repository/maven-public/' }
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:2.1.3.RELEASE")
}
}
apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
sourceCompatibility = 1.8
targetCompatibility = 1.8
dependencies {
compile("org.springframework.boot:spring-boot-starter-web")
compile group: 'org.projectlombok', name: 'lombok', version: '1.18.0'
}
BaseResponse 类
package hello;
import lombok.AllArgsConstructor;
import lombok.Data;
import java.io.Serializable;
@Data
@AllArgsConstructor
public class BaseResponse implements Serializable {
Boolean success;
String msg;
Object result;
public static BaseResponse success(String msg, Object result) {
return new BaseResponse(true, msg, result);
}
public static BaseResponse fail(String msg, Object result) {
return new BaseResponse(false, msg, result);
}
}
GreetingRequest 类
package hello;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
public class GreetingRequest {
private String msg;
}
GreetingResponse 类
package hello;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class GreetingResponse {
private long id;
private String content;
}
Application 类：程序主入口
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);
}
}
GreetingController 类
package hello;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.web.bind.annotation.*;
@RestController
public class GreetingController {
private static final String template = "Hello, %s!";
private final AtomicLong counter = new AtomicLong();
@RequestMapping(value = "/greeting1")
public BaseResponse greeting1(@RequestBody GreetingRequest request) {
return BaseResponse.success("", new GreetingResponse(counter.incrementAndGet(), String.format(template, request.getMsg())));
}
}
@RequestBody注解用于将请求中的JSON转换为对象。
运行示例
运行 Application 类。使用 Postman 构建 POST 请求到http://127.0.0.1:8080/greeting1，请求体是json：
{"msg": "World"}
响应体：
{
"success": true,
"msg": "",
"result": {
"id": 1,
"content": "Hello, World!"
}
}