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>();
"姓名", "张三");
"年龄", "22");
"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
    }
 
    public String getSex() {
       return sex;
    }
 
    public  void setSex(String sex) {
       this.sex
    }
 
    public  int getAge() {
       return age;
    }
 
    public  void setAge(int age) {
       this.age
    }
 
    public String getAddress() {
       return address;
    }
 
    public  void setAddress(String address) {
       this.address
    }
 
    public Date getBirthday() {
       return birthday;
    }
 
    public  void setBirthday(Date birthday) {
       this.birthday
    }
 
    public Person(String name, String sex, int age, String address,
           Date birthday) {
       super();
       this.name
       this.sex
       this.age
       this.address
       this.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) {
       
"{'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