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@JSONFORMat和@DateTimeFormat对Date格式化 实体类 package com.pojo; import java.util.Date; import c
package com.pojo;
import java.util.Date;
import com.fasterxml.jackson.annotation.jsonFormat;
public class User {
private Long id;
private String username;//用户名
private String passWord;//密码
private String phone;//手机号
private String email;//邮箱
private Date created;//创建日期
private Date updated;//修改日期
public Long getId() { return id; }
public void setId(Long id) { this.id = id;}
public String getUsername() {return username;}
public void setUsername(String username) {this.username = username;}
public String getPassword() { return password;}
public void setPassword(String password) { this.password = password;}
public String getPhone() { return phone;}
public void setPhone(String phone) {this.phone = phone;}
public String getEmail() {return email;}
public void setEmail(String email) { this.email = email;}
public Date getCreated() {return created;}
public void setCreated(Date created) {this.created = created;}
public Date getUpdated() {return updated;}
public void setUpdated(Date updated) {this.updated = updated;}
}
控制器:
@RequestMapping("/getdate")
@ResponseBody
public TbUser getdate() {
TbUser user = new TbUser();
user.setId(1001l);
user.setUsername("zhangsan");
user.setPassword("1234567");
user.setPhone("15225969681");
user.setEmail("123@qq.com");
user.setUpdated(new Date());
user.setCreated(new Date());
return user;
}
访问控制器在浏览器中输出的json格式如下:
{"id":1001,"username":"zhangsan","password":"1234567","phone":"15212559252","email":"123@qq.com","created":1545288773904,"updated":"1545288773904"}
可见created、updated这两个属性值是时间戳并不是“yyyy-MM-dd HH:mm:ss”格式,那怎么把日期类型格式化成我们想要的类型呢,其实很简单只需要在实体类的属性上加上**@JsonFormat**注解就行了。
@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
private Date created;
@JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
private Date updated;
@JsonFormat(pattern=“yyyy-MM-dd”,timezone = “GMT+8”)
**pattern:**是你需要转换的时间日期的格式
**timezone:**是时间设置为东八区(北京时间)
提示:@JsonFormat注解可以在属性的上方,同样可以在属性对应的get方法上,两种方式没有区别。
再次访问控制器,会发现在浏览器中输出的json格式就会变成我们指定的时间格式了。如下:
{"id":1001,"username":"zhangsan","password":"1234567","phone":"15225969681","email":"123@qq.com","created":2018-12-19 19:00:11,"updated":"2018-12-19 19:00:11"}
加上注解后将User对象转为json字符串时也是会按照注解中的格式进行转换
Index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "Http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>测试</title>
</head>
<body>
<form method="post" action="/getuser">
用户名:<input type="text" name="username"/></br>
密码:<input type="password" name="password"/></br>
手机:<input type="text" name="phone"/></br>
邮箱:<input type="text" name="email"/></br>
创建日期:<input type="datetime" name="created"/></br>
修改日期:<input type="datetime" name="updated"/></br>
<input type="submit" />
</form>
</body>
</html>
@RequestMapping(value="/getuser", method=RequestMethod.POST)
@ResponseBody
public TbUser getuser(TbUser user) {
System.out.println("-------------------------------");
System.out.println(user.toString());
System.out.println("-------------------------------");
return user;
}
当User实体类created、updated不加注解 @DateTimeFormat(pattern = “yyyy-MM-dd”) 时可以输入任意格式的日期如yyyy-MM-dd、yyyy/MM/dd…,后台仍会将接收到的字符串转换为Date,但如果加上@DateTimeFormat注解就只能按照注解后面的日期格式进行输入了。
当User实体类created、updated不加注解 @DateTimeFormat(pattern = “yyyy-MM-dd”) 时可以输入任意格式的日期如yyyy-MM-dd、yyyy/MM/dd…,后台仍会将接收到的字符串转换为Date,但如果加上@DateTimeFormat注解就只能按照注解后面的日期格式进行输入了。
@DateTimeFormat(pattern = "yyyy-MM-dd")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
private Date created;
@DateTimeFormat(pattern = "yyyy-MM-dd")
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
private Date updated;
控制台输出结果如下:
User [id=null, username=test, password=123, phone=12345678901, email=12112@qq.com, created=Thu Dec 20 00:00:00 CST 2012, updated=Thu Dec 20 00:00:00 CST 2012]
注解**@JsonFormat**:主要是控制后台到前台的时间格式
注解**@DateTimeFormat**:主要是限制前台到后台的时间格式
package com.common.utils;
import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
public class JsonUtils {
// 定义jackson对象
private static final ObjectMapper MAPPER = new ObjectMapper();
public static String objectToJson(Object data) {
try {
String string = MAPPER.writeValueAsString(data);
return string;
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
try {
T t = MAPPER.readValue(jsonData, beanType);
return t;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static <T>List<T> jsonToList(String jsonData, Class<T> beanType) {
JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
try {
List<T> list = MAPPER.readValue(jsonData, javaType);
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
json 数据的日期格式化一直都是一个问题,没有能够按照自己想要的格式格式化的方法或者工具,所以把自己用过的整理一下.
引入jar包:
jackson-all-1.8.5.jar 不一定固定这个版本.
org.codehaus.jackson.map.ObjectMapper.class 需要导入这个转换对象.
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.15</version>
</dependency>
// Date日期格式化
ObjectMapper mapper = new ObjectMapper();
mapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
// 将null替换为""
mapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
@Override
public void serialize(Object obj, JsonGenerator jg, SerializerProvider sp)
throws IOException, JsonProcessingException {
jg.writeString(""); // Null 值转 “”(String串)
}
});
// 只保留包含的字段
// 实现自定义字段保留filterOutAllExcept,过滤serializeAllExcept
mapper.setFilters(new SimpleFilterProvider().addFilter(ReportLoss.class.getName(),
SimpleBeanPropertyFilter.serializeAllExcept("id", "title")));
mapper.setAnnotationIntrospector(new JacksonAnnotationIntrospector(){
@Override
public Object findFilterId(AnnotatedClass ag) {
return ag.getName();
}
});
// 得到格式化后的json数据
String asString = mapper.writeValueAsString(queryActiveList);
注解使用:(对象)
字段注解过滤
@JsonIgnore属性上 或者 @JsonIgnoreProperties({"createTime","valid"})实体类上
@JsonProperty("idName")更改字段名,属性上
// 过滤对象的null属性.
mapper.setSerializationInclusion(Inclusion.NON_NULL);
// 过滤map中的null值
mapper.configure(Feature.WRITE_NULL_MAP_VALUES, false);
//JSONObject转Map<String, Object>
@SuppressWarnings("unchecked")
private Map<String, Object> getJsonToMap(JSONObject json) {
Map<String,Object> map = new HashMap<String, Object>();
try {
ObjectMapper mapper = new ObjectMapper();
map = mapper.readValue(json.toString(), Map.class);
} catch (Exception e) {
e.printStackTrace();
}
return map;
}
为了方便,整理了一份工具类:JsonDMOUtil.java
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
public class JsonDMOUtil {
public static String jsonDateFormate(Object object, String dateFormate) {
String asString = "";
try {
// Date日期格式化
if ("".equals(dateFormate.trim()) || dateFormate == null) {
dateFormate = "yyyy-MM-dd HH:mm:ss";
}
ObjectMapper mapper = JsonDMOUtil.getObjectMapper(dateFormate);
// 得到格式化后的json数据
asString = mapper.writeValueAsString(object);
} catch (Exception e) {
e.printStackTrace();
}
return asString;
}
public static JSONObject jsonDTOFormate(Object object, String dateFormate) {
String asString = "";
try {
// Date日期格式化
if ("".equals(dateFormate.trim()) || dateFormate == null) {
dateFormate = "yyyy-MM-dd HH:mm:ss";
}
ObjectMapper mapper = JsonDMOUtil.getObjectMapper(dateFormate);
// 得到格式化后的json数据
asString = mapper.writeValueAsString(object);
} catch (Exception e) {
e.printStackTrace();
}
return JSON.parseObject(asString);
}
@SuppressWarnings("unchecked")
public static Map<String, String> jsonDTMFormate(Object object, String dateFormate) {
Map<String, String> resultMap = new HashMap<String, String>();
try {
JSONObject jsonObj = JSON.parseObject(object.toString());
// Date日期格式化
if ("".equals(dateFormate.trim()) || dateFormate == null) {
dateFormate = "yyyy-MM-dd HH:mm:ss";
}
ObjectMapper mapper = JsonDMOUtil.getObjectMapper(dateFormate);
JSONObject header = jsonObj.getJSONObject("header");
JSONObject body = jsonObj.getJSONObject("body");
Map<String, String> headerMap = null;
Map<String, String> bodyMap = null;
if (header != null) {
headerMap = mapper.readValue(header.toString(), Map.class);
for (Entry<String, String> map : headerMap.entrySet()) {
resultMap.put(map.geTKEy(), map.getValue());
}
}
if (body != null) {
bodyMap = mapper.readValue(body.toString(), Map.class);
for (Entry<String, String> map : bodyMap.entrySet()) {
resultMap.put(map.getKey(), map.getValue());
}
}
if (resultMap.isEmpty()) {
resultMap = mapper.readValue(jsonObj.toString(), Map.class);
}
} catch (Exception e) {
e.printStackTrace();
}
return resultMap;
}
public static String jsonDateFormate(Object object) {
String asString = "";
try {
// Date日期格式化
ObjectMapper mapper = JsonDMOUtil.getObjectMapper("yyyy-MM-dd HH:mm:ss");
asString = mapper.writeValueAsString(object);
} catch (Exception e) {
e.printStackTrace();
}
return asString;
}
public static JSONObject jsonDTOFormate(Object object) {
String asString = "";
try {
// Date日期格式化
ObjectMapper mapper = JsonDMOUtil.getObjectMapper("yyyy-MM-dd HH:mm:ss");
asString = mapper.writeValueAsString(object);
} catch (Exception e) {
e.printStackTrace();
}
return JSON.parseObject(asString);
}
@SuppressWarnings("unchecked")
public static Map<String, String> jsonDTMFormate(Object object) {
Map<String, String> resultMap = new HashMap<String, String>();
try {
JSONObject jsonObj = JSON.parseObject(object.toString());
// Date日期格式化
ObjectMapper mapper = JsonDMOUtil.getObjectMapper("yyyy-MM-dd HH:mm:ss");
JSONObject header = jsonObj.getJSONObject("header");
JSONObject body = jsonObj.getJSONObject("body");
Map<String, String> headerMap = null;
Map<String, String> bodyMap = null;
if (header != null) {
headerMap = mapper.readValue(header.toString(), Map.class);
for (Entry<String, String> map : headerMap.entrySet()) {
resultMap.put(map.getKey(), map.getValue());
}
}
if (body != null) {
bodyMap = mapper.readValue(body.toString(), Map.class);
for (Entry<String, String> map : bodyMap.entrySet()) {
resultMap.put(map.getKey(), map.getValue());
}
}
if (resultMap.isEmpty()) {
resultMap = mapper.readValue(jsonObj.toString(), Map.class);
}
} catch (Exception e) {
e.printStackTrace();
}
return resultMap;
}
private static ObjectMapper getObjectMapper(String dateFormate) {
// Date日期格式化
ObjectMapper mapper = new ObjectMapper();
mapper.setDateFormat(new SimpleDateFormat(dateFormate));
// 将null替换为""
mapper.getSerializerProvider().setNullValueSerializer(new JsonSerializer<Object>() {
@Override
public void serialize(Object obj, JsonGenerator jg, SerializerProvider sp)
throws IOException {
jg.writeString(""); // Null 值转 “”(String串)
}
});
return mapper;
}
}
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。
--结束END--
本文标题: 使用@JsonFormat和@DateTimeFormat对Date格式化操作
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