java json_lib 怎么用_java利用json-lib操作json

朱雀 2022-10-22 15:59 130阅读 0赞

1.1.  下载json-lib.jar

1.2.  Java对象转换为json

1.2.1.  Map对象转换为json

Map2Json.java

package json;

import java.util.HashMap;

import java.util.Map;

import net.sf.json.JSONArray;

public class Map2Json \{

public static void main(String\[\] args) \{

Map map = new HashMap();

map.put("姓名", "张三");

map.put("年龄", "22");

map.put("性别", "男");

JSONArray jsonArray = JSONArray.fromObject(map);

System.out.println(jsonArray.toString());

运行结果:

\[\{"性别":"男","姓名":"张三","年龄":"22"\}\]

1.2.2.  List转换为json对象

List2json.java

package json;

import java.util.ArrayList;

import java.util.List;

import net.sf.json.JSONArray;

public class List2Json \{

public static void main(String\[\] args) \{

List list = new ArrayList();

list.add("aa");

list.add("bb");

list.add("cc");

list.add("dd");

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println(jsonArray.toString());

结果:

\["aa","bb","cc","dd"\]

1.2.3.  Java bean转为json对象

Person.java

package json;

import java.util.Date;

public class Person \{

private String name;

private String sex;

private int age;

private String address;

private Date birthday;

public String getName() \{

return name;

public void setName(String name) \{

this.name = name;

public String getSex() \{

return sex;

public void setSex(String sex) \{

this.sex = sex;

public int getAge() \{

return age;

public void setAge(int age) \{

this.age = age;

public String getAddress() \{

return address;

public void setAddress(String address) \{

this.address = address;

public Date getBirthday() \{

return birthday;

public void setBirthday(Date birthday) \{

this.birthday = birthday;

public Person(String name, String sex, int age, String address,

Date birthday) \{

super();

this.name = name;

this.sex = sex;

this.age = age;

this.address = address;

this.birthday = birthday;

public Person() \{

super();

//TODOAuto-generated constructor stub

Bean2Json.java

package json;

import java.util.Date;

import net.sf.json.JSONArray;

public class Bean2Json \{

public static void main(String\[\] args) \{

Person person = new Person();

person.setAddress("深圳福田");

person.setAge(22);

person.setBirthday(new Date());

person.setName("张三");

person.setSex("男");

JSONArray jsonArray = JSONArray.fromObject(person);

System.out.println(jsonArray.toString());

运行结果:

\[\{"address":"深圳福田","age":22,"birthday":\{"date":27,"day":2,"hours":22,"minutes":47,"month":0,"seconds":22,"time":1422370042957,"timezoneOffset":-480,"year":115\},"name":"张三","sex":"男"\}\]

1.3.  Json转换为map对象

Json2Map.java

package json;

import java.util.HashMap;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

import net.sf.json.JSONObject;

public class Json2Map \{

public static void main(String\[\] args) \{

String jsonStr = "\{'性别':'男','姓名':'张三','年龄':'22'\}";

JSONObject object = JSONObject.fromObject(jsonStr);

Map map = new HashMap();

Set keySet = object.keySet();

for (String key : keySet) \{

map.put(key, object.getString(key));

Set> entrySet = map.entrySet();

for (Entry entry : entrySet) \{

System.out.println(entry.getKey()+":"+entry.getValue());

运行结果:

性别:男

姓名:张三

年龄:22

java json_lib 怎么用_java利用json-lib操作json

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