[Spring] REST JSON Response 예제

1.

BeanNameViewResolver, 

MappingJackson2JsonView 적용

 

BeanNameViewResolver 클래스는 뷰 이름과 동일한 이름을 갖는 빈을 뷰 객체로 사용합니다. BeanNameViewResolver는 주로 커스텀 View 클래스를 뷰로 사용해야 하는 경우 사용됩니다. 스프링4 버전은 자바 객체를 JSON으로 변환해서 보여주는 뷰 구현 클래스인 MappingJackson2JsonView를 제공하고 있습니다. 컨트롤러에서는 다음과 같이 뷰 이름으로 MappingJackson2JsonVie 타입의 빈을 설정해주면 됩니다. MappingJackson2JsonView는 모델에 저장된 모든 객체를 JSON 형식으로 변환해줍니다. MappingJackson2JsonView는 내부적으로 Jackson 라이브러리의 ObjectMapper를 이용해서 자바 객체를 JSON 형식으로 변환합니다.

1_1) 

servlet-context.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
 
    <context:component-scan base-package="com.tychejin.springrest" />
    <mvc:annotation-driven />
 
    <!-- BeanNameViewResolver 설정-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.BeanNameViewResolver"/>
    
    <!-- MappingJackson2JsonView 설정 -->
    <bean id="jsonTemplate" class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>
    
</beans>

 

1_2) 

RESTConfiguration.java

package com.tychejin.springrest.config;
 
public class RESTConfiguration {
 
    @Bean
    public View jsonTemplate() {
        MappingJackson2JsonView view = new MappingJackson2JsonView();
        view.setPrettyPrint(true);
        return view;
    }
 
    @Bean
    public ViewResolver viewResolver() {
        return new BeanNameViewResolver();
    }
}

 

2.Jackson 라이브러리 추가

 Java 객체를 JSON으로 변환하기 위해서는 Jackson 라이브러를 추가해야합니다.

<?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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.tychejin</groupId>
    <artifactId>springrest</artifactId>
    <name>springrest</name>
    <packaging>war</packaging>
    <version>1.0.0-BUILD-SNAPSHOT</version>
    <properties>
        <java-version>1.8</java-version>
        <org.springframework-version>4.1.4.RELEASE</org.springframework-version>    
    </properties>
    <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
          <scope>test</scope>
        </dependency>
         
        <!-- Spring -->             
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
     
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>
         
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>       
        
        <!-- Jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.4.1</version>
        </dependency>
 
    </dependencies>
    <build>
        <finalName>springrest</finalName>
    </build>
</project>
 

 

3.Controller 생성

EmployeeRestController02.java

package com.tychejin.springrest.controller;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
 
import com.tychejin.springrest.common.CommonUtil;
import com.tychejin.springrest.model.Employees;
 
@Controller
public class EmployeeRestController02 {
 
    public Employees getEmployeeList() {
 
        Employees employees = new Employees();
 
        employees = CommonUtil.setEmployees(00);
 
        return employees;
    }
 
    @RequestMapping(value = "/getEmployees02")
    public String getAllEmployeesJSON(Model model) {
        model.addAttribute("Result", getEmployeeList());
        return "jsonTemplate";
    }
}

 

4.작성한 API 호출

 http://localhost:8080/getEmployees02