spring boot或springmvc返回时把date类型的字段转成字符串

我们都知道spring boot或者springmvc可以借助自带的jackson直接把实体对象装成json，这次不是分享关于框架如何返回json,而是要给大家分享实体类里的date类型的字段在返回时怎么统一处理成统一返回成string类型

1 使用注解类让其继承JsonSerializer，如下所示

package com.debug;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

public class CustomDateSerializer extends JsonSerializer<Date>{

@Override
public void serialize(Date value, JsonGenerator jgen, SerializerProvider arg2)
throws IOException, JsonProcessingException {
// TODO Auto-generated method stub
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String formattedDate = formatter.format(value);
jgen.writeString(formattedDate);

}

}


2 把这个类使用注解的方式追加相应字段的getter方法上
public class UserInfo {
private String name;
private int id;
private Date birthday;

@JsonSerialize(using = CustomDateSerializer.class)
public Date getBirthday() {
return birthday;
}

public void setBirthday(Date birthday) {
this.birthday = birthday;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

}
3  controller的测试代码

package com.debug;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HiController {

@RequestMapping("/getUserInfo.do")
public List<UserInfo> getUserInfo() {

UserInfo u1=new UserInfo();
u1.setId(1);
u1.setName("justin timberlake");
u1.setBirthday(new Date());

UserInfo u2=new UserInfo();
u2.setId(2);
u2.setName("林志颖");
u2.setBirthday(new Date());

List<UserInfo> userList=new ArrayList<UserInfo>();
userList.add(u1);
userList.add(u2);

return userList;
}

}


看下最终的效果