Springboot返回json数据

Springboot返回json数据

*1. SpringBoot框架默认的方式;
1.编写实体类student;

package com.gmm;
public class Student { 
private Integer sId; 
private String sName;
private String gender; 
public Integer getsId() {
			 return sId;
	} 
public void setsId(Integer sId) {
			 this.sId = sId; 
} 
public String getsName() { 
			return sName;
 } 
public void setsName(String sName) { 
			this.sName = sName; 
} 
public String getGender() {
         return gender;
 } 
public void setGender(String gender) {
 this.gender = gender; 
} 

2.编写getStudernt()方法在controller中;
写法:创建一个学生对象设置学生属性信息数据然后获取以json的方式获取这些数据;

package com.gmm;
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
@RestController public class Controller {
@RequestMapping("/getStudent") 
public Student getStudent(){
 Student student = new Student();
 student.setGender("女"); student.setsName("莉香");
 student.setsId(1); return student;
 }

*第二种方式;
Spring Boot使用FastJson解析JSON数据
1.在上面pom,xml文件依赖的基础上添加FastJson的依赖包;

<dependency>
		 <groupId>com.alibaba</groupId> 
		 <artifactId>fastjson</artifactId>
		 <version>1.2.15</version>
 </dependency> 

2.配置fastjon(支持两种方法);
第一种方法:
一:启动类继承extends WebMvcConfigurerAdapter，覆盖方法configureMessageConverters关键代码

@SpringBootApplication 
public class Application extends WebMvcConfigurerAdapter { 
private static Logger logger = Logger.getLogger(Application.class); 
@Override 
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
super.configureMessageConverters(converters); 
//1.需要定义一个convert转换消息的对象; 
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new 
FastJsonHttpMessageConverter(); 
//2.添加fastJson的配置信息，比如：是否要格式化返回的json数据;
FastJsonConfig fastJsonConfig = new FastJsonConfig(); 
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat); 
//3处理中文乱码问题 
List<MediaType> fastMediaTypes = new ArrayList<>(); 
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); 
//4.在convert中添加配置信息. 
fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); 
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); 
//5.将convert添加到converters当中.
 converters.add(fastJsonHttpMessageConverter);
 } 
实体类
@JSONField(format = "yyyy-MM-dd HH:mm")
private Date createTime; 
public Date getCreateTime() {
 return createTime; 
} 
public void setCreateTime(Date createTime) {
 this.createTime = createTime; 
} 

@JSONField(format = “yyyy-MM-dd HH:mm”)此注解是fastjon包提供的用于指定将数据返回什么样的json格式数据;
二:启动测试类中注入Bean: HttpMessageConverters
具体做法:删除继承extends WebMvcConfigurerAdapter;
删除重写的方法改为以下代码;

@Bean 
public HttpMessageConverters fastJsonHttpMessageConverters(){ 
//1.需要定义一个convert转换消息的对象; 
FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new 
FastJsonHttpMessageConverter();
 //2:添加fastJson的配置信息; 
FastJsonConfig fastJsonConfig = new FastJsonConfig(); 
fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
 //3处理中文乱码问题 
List<MediaType> fastMediaTypes = new ArrayList<>(); 
fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); 
//4.在convert中添加配置信息. 
fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); 
fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); 
HttpMessageConverter<?> converter = fastJsonHttpMessageConverter;
 return new HttpMessageConverters(converter); 
}