java利用json-lib操作json

1.1.  下载json-lib.jar

http://sourceforge.net/projects/json-lib/files/json-lib/

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<String, String> map = new HashMap<String, String>();        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<String> list = new ArrayList<String>();                                       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();        // TODO Auto-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<String,String> map = new HashMap<String,String>();               Set<String> keySet = object.keySet();               for (String key : keySet) {            map.put(key, object.getString(key));        }               Set<Entry<String,String>> entrySet = map.entrySet();               for (Entry<String, String> entry : entrySet) {            System.out.println(entry.getKey()+":"+entry.getValue());        }            }   }

运行结果:

性别:男

姓名:张三

年龄:22