对于JSON，大家常用的就是Gson、JackSon、FastSon，那么今天先来介绍利用JackSon进行JSON的序列化和解析。
首先，IDE我选择使用IDEA，那么自然也会使用MAVEN来管理依赖，一下是pox.xml的配置：
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<
dependency
>
<
groupId
>com.fasterxml.jackson.core</
groupId
>
<
artifactId
>jackson-core</
artifactId
>
<
version
>2.6.3</
version
>
</
dependency
>
<
dependency
>
<
groupId
>com.fasterxml.jackson.core</
groupId
>
<
artifactId
>jackson-annotations</
artifactId
>
<
version
>2.6.3</
version
>
</
dependency
>
<
dependency
>
<
groupId
>com.fasterxml.jackson.core</
groupId
>
<
artifactId
>jackson-databind</
artifactId
>
<
version
>2.6.3</
version
>
</
dependency
>
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一、首先使用不带注解的方式：
1、创建User类：
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package
info.tshare.jacksondemo;
import
java.util.Date;
/**
* Created with IntelliJ IDEA.
* User: Tshare
* Date: 2015-11-24
* Time: 9:26
* JSON序列化和反序列化使用的User类
*/
public
class
User {
private
String name;
private
Integer age;
private
Date birthday;
private
String email;
public
String getName() {
return
name;
}
public
void
setName(String name) {
this
.name = name;
}
public
Integer getAge() {
return
age;
}
public
void
setAge(Integer age) {
this
.age = age;
}
public
Date getBirthday() {
return
birthday;
}
public
void
setBirthday(Date birthday) {
this
.birthday = birthday;
}
public
String getEmail() {
return
email;
}
public
void
setEmail(String email) {
this
.email = email;
}
}
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2、创建测试类：
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package
info.tshare.jacksondemo;
import
com.fasterxml.jackson.core.JsonProcessingException;
import
com.fasterxml.jackson.databind.ObjectMapper;
import
java.io.IOException;
import
java.text.ParseException;
import
java.text.SimpleDateFormat;
import
java.util.List;
import
java.util.ArrayList;
/**
* Created with IntelliJ IDEA.
* User: Tshare
* Date: 2015-11-24
* Time: 9:28
*/
public
class
JacksonDemo {
public
static
void
main(String[] args)
throws
ParseException, IOException {
User user =
new
User();
user.setName(
"Tshare"
);
user.setEmail(
"tshareinfo@gmail.com"
);
user.setAge(
24
);
SimpleDateFormat dateFormat =
new
SimpleDateFormat(
"yyyy-MM-dd"
);
user.setBirthday(dateFormat.parse(
"1991-01-01"
));
/**
* ObjectMapper是JSON操作的核心，Jackson的所有JSON操作都是在ObjectMapper中实现。
* ObjectMapper有多个JSON序列化的方法，可以把JSON字符串保存File、OutputStream等不同的介质中。
* writeValue(File arg0, Object arg1)把arg1转成json序列，并保存到arg0文件中。
* writeValue(OutputStream arg0, Object arg1)把arg1转成json序列，并保存到arg0输出流中。
* writeValueAsBytes(Object arg0)把arg0转成json序列，并把结果输出成字节数组。
* writeValueAsString(Object arg0)把arg0转成json序列，并把结果输出成字符串。
*/
ObjectMapper mapper =
new
ObjectMapper();
/**
* User类转JSON
* 输出结果{"name":"Tshare","age":24,"birthday":662659200000,"email":"tshareinfo@gmail.com"}
*/
String json = mapper.writeValueAsString(user);
System.out.println(json);
/**
* Java集合转Json
* 输出结果[{"name":"Tshare","age":24,"birthday":662659200000,"email":"tshareinfo@gmail.com"}]
*/
List<User> users =
new
ArrayList<User>();
users.add(user);
String jsonlist = mapper.writeValueAsString(users);
System.out.println(jsonlist);
String jsonstr =
"{\"name\":\"Tshare\",\"age\":24,\"birthday\":662659200000,\"email\":\"tshareinfo@gmail.com\"}"
;
/**
* ObjectMapper支持从byte[]、File、InputStream、字符串等数据的JSON反序列化。
*/
User userJson = mapper.readValue(jsonstr,User.
class
);
System.out.println(userJson);
}
}
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二、测试使用注解的方式：
1、创建User类：
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package
info.tshare.jacksondemo;
import
com.fasterxml.jackson.annotation.JsonFormat;
import
com.fasterxml.jackson.annotation.JsonIgnore;
import
com.fasterxml.jackson.annotation.JsonProperty;
import
java.util.Date;
/**
* Created with IntelliJ IDEA.
* User: Tshare
* Date: 2015-11-24
* Time: 9:26
* JSON序列化和反序列化使用的User类
*/
public
class
User {
private
String name;
@JsonIgnore
//不JSON序列化年龄
private
Integer age;
@JsonFormat
(pattern =
"yyyy年MM月dd日"
)
//格式化日期属性
private
Date birthday;
@JsonProperty
(
"mail"
)
//序列化email属性为mail
private
String email;
public
String getName() {
return
name;
}
public
void
setName(String name) {
this
.name = name;
}
public
Integer getAge() {
return
age;
}
public
void
setAge(Integer age) {
this
.age = age;
}
public
Date getBirthday() {
return
birthday;
}
public
void
setBirthday(Date birthday) {
this
.birthday = birthday;
}
public
String getEmail() {
return
email;
}
public
void
setEmail(String email) {
this
.email = email;
}
}
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2、创建测试类：
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package
info.tshare.jacksondemo;
import
com.fasterxml.jackson.core.JsonProcessingException;
import
com.fasterxml.jackson.databind.ObjectMapper;
import
java.io.IOException;
import
java.text.ParseException;
import
java.text.SimpleDateFormat;
import
java.util.List;
import
java.util.ArrayList;
/**
* Created with IntelliJ IDEA.
* User: Tshare
* Date: 2015-11-24
* Time: 9:28
*/
public
class
JacksonDemo {
public
static
void
main(String[] args)
throws
ParseException, JsonProcessingException {
User user =
new
User();
user.setName(
"Tshare"
);
user.setEmail(
"tshareinfo@gmail.com"
);
user.setAge(
24
);
SimpleDateFormat dateFormat =
new
SimpleDateFormat(
"yyyy-MM-dd"
);
user.setBirthday(dateFormat.parse(
"1991-01-01"
));
ObjectMapper mapper =
new
ObjectMapper();
String json = mapper.writeValueAsString(user);
System.out.println(json);
}
}
|
执行结果：
{"name":"Tshare","birthday":"1990年12月31日","mail":"tshareinfo@gmail.com"}
https://blog.liyang.io/25.html
本文转自 stock0991 51CTO博客，原文链接:http://blog.51cto.com/qing0991/1943336
