springMVC 配置（javaConfig）接收JSON，返回JSON

1、导包，spring的相关包，和JSON的包，解析JSON格式spring用到了JSON的包

 
		
  
   4.2.4.RELEASE
  
		
  
   2.5.1
  
	
 
    
 
        
  
		
   
   
    org.springframework
    
   
    spring-webmvc
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-web
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-jdbc
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-tx
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-context-support
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-aop
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-aspects
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-beans
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-core
    
   
    ${springframework.version}
    
  
		
   
   
    org.springframework
    
   
    spring-context
    
   
    ${springframework.version}
    
  
        
  
		
   
   
    com.fasterxml.jackson.core
    
   
    jackson-databind
    
   
    ${jackson.version}
    
  
		
   
   
    com.fasterxml.jackson.core
    
   
    jackson-core
    
   
    ${jackson.version}
    
  
		
   
   
    com.fasterxml.jackson.core
    
   
    jackson-annotations
    
   
    ${jackson.version}
    
  
    
 

2、配置WebInitializer

package com.amiu.spring.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class WebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{

	@Override
	protected Class
 [] getRootConfigClasses() {
		return new Class[]{MvcConfig.class};
	}

	@Override
	protected Class
 [] getServletConfigClasses() {
		return null;
	}

	@Override
	protected String[] getServletMappings() {
		return new String[]{"/"};
	}
	
}

3、这里是重点，配置MvcConfig

package com.amiu.spring.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

@Configuration
@EnableWebMvc
@ComponentScan("com.amiu")
public class MvcConfig extends WebMvcConfigurerAdapter {

	@Override
	public void configureDefaultServletHandling(
			DefaultServletHandlerConfigurer configurer) {
			configurer.enable();
	}

	@Override
	public void configureViewResolvers(ViewResolverRegistry registry) {
		//registry.jsp("/WEB-INF/page/", ".jsp");
		//将返回的参数转换为JSON，MappingJackson2JsonView就是做这个的
		registry.enableContentNegotiation(new MappingJackson2JsonView());
	}
	
	@Override
	public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
		configurer.favorPathExtension(true)
				.defaultContentType(MediaType.APPLICATION_JSON)//默认接收JSON
				.mediaType("json", MediaType.APPLICATION_JSON);
	}

	
}

4、Controller

package com.amiu.spring;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.amiu.Bean;

@Controller
public class SpringController {
    //接收JSON加上@RequestBody，这里一定用一个对象来接收，不能直接接收单个字段
	@RequestMapping("/testJson")
	public Bean testJson(@RequestBody Bean bean){
		System.out.println("in method");
		//从页面仅仅获取id，返回我们new的一个Bean
		return new Bean(bean.getId(), "json", "{jsonPwd}", 13930000);
	}

}

5、传给spring的JSON的格式

传给spring：
{
	"id":1,
	"name":"",
	"password":"",
	"phone":""
}

spring返回：
{
    "bean": {
        "id": 0,
        "name": "json",
        "password": "{jsonPwd}",
        "phone": 13930000
    }
}