使用FastJson轉化Json格式

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1.下載Jar包

http://repo1.maven.org/maven2/com/alibaba/fastjson/

2.將jar包匯入工程3.樣本

package nc.testFastJson;import java.util.ArrayList;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;import com.alibaba.fastjson.TypeReference;public class TestFastJson {    public static void main(String[] args) {                //    java對象 轉 json        People p1 = new People("people_1","Male",1);        String p1_Json = JSON.toJSONString(p1);        System.out.println(p1_Json.toString());                //    json 轉 java對象        String p2_Json = "{‘name‘:‘people_2‘,‘sex‘:‘Male‘,‘age‘:2}";        People p2 = JSON.parseObject(p2_Json, People.class);        System.out.println(p2.toString());                //    java對象LinkedList集合 轉 json        LinkedList<People> p_list = new LinkedList<>();        People p3 = new People("people_3","Male",3);        People p4 = new People("people_4","Male",4);        People p5 = new People("people_5","Male",5);                p_list.add(p3);        p_list.add(p4);        p_list.add(p5);                String p_list_Json = JSON.toJSONString(p_list);        System.out.println(p_list_Json);                //    json 轉 java對象List集合         List<People> p_list_2 = JSON.parseArray(p_list_Json, People.class);        for (People people : p_list_2) {            System.out.println(people.toString());        }                //    java對象ArrayList 轉 json        ArrayList<People> arrayList = new ArrayList<>();        arrayList.add(p3);        arrayList.add(p4);        arrayList.add(p5);                String arrays_json = JSON.toJSONString(arrayList);        System.out.println(arrays_json);                //    json 轉 java對象List集合         List<People> arrayList2 = JSON.parseArray(arrays_json, People.class);        for (People people : arrayList2) {            System.out.println(people.toString());        }                //    map 轉 json        HashMap<String ,People> map = new HashMap<>();          map.put("p3", p3);        map.put("p4", p4);        map.put("p5", p5);                String map_json = JSON.toJSONString(map);        System.out.println(map_json);                //    json 轉 map        Map<String, String> map2 = JSONObject.parseObject(map_json.toString(), new TypeReference<Map<String, String>>(){});        Set<Entry<String, String>> entrySet = map2.entrySet();        for (Entry<String, String> entry : entrySet) {            String key = entry.getKey();            String value = entry.getValue();            People p = JSON.parseObject(value, People.class);                        System.out.println(key+":"+p.toString());        }            }}

package nc.testFastJson;public class People {        private String name ;    private String sex ;    private int age ;    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;    }    @Override    public String toString() {        return "People [name=" + name + ", sex=" + sex + ", age=" + age + "]";    }        public People() {        super();    }    public People(String name, String sex, int age) {        super();        this.name = name;        this.sex = sex;        this.age = age;    }    }

 

使用FastJson轉化Json格式