FastJson的使用
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时间：2015年06月09日
研究了下FastJson的使用方法，感觉比较好使，可以创建json字符串，也可以根据json字符串来创建对象
* 1、class Json.parseObject(String,clazz.class);//将一个JSON字符串转换成约定的Java实体对象
* 2、String Json.toString(class,boolean);//将一个实体对象转化成JSON字符串
* 3、String Json.toJSONString(collection,boolean);//将一个集合中的数据转化成JSON字符串
* 4、JSONArray Json.parseJSONArray(String);//将一个JSON字符串转换成JSONArray
package com.flag.app;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Vector;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.flag.app.Entity.Welcome;
/**
* 主要使用的API有下面几个：
*
* 1、class Json.parseObject(String,clazz.class);//将一个JSON字符串转换成约定的Java实体对象
* 2、String Json.toString(class,boolean);//将一个实体对象转化成JSON字符串
* 3、String Json.toJSONString(collection,boolean);//将一个集合中的数据转化成JSON字符串
* 4、JSONArray Json.parseJSONArray(String);//将一个JSON字符串转换成JSONArray
*
* @author Administrator
*
*/
public class FastJsonMain {
static String json = "{\"study\": 10,\"study_course_count\": 10, \"recieved_reg_form_count\": 0,\"unread_count\": 5,\"teach_course_count\": 8,\"avatar\": \"1316634098115-02-57\",\"user_id\": 201,\"nickname\": \"Asus人名\"}";
static String arrayAyy="[[14,\"小学语文\"],[154,\"美食\"],[72,\"高中物理\"],null,[50,\"高中化学\"],[15,\"小学数学\"],[13\"英语\"],null,[1,\"其他英语培训\"],null]";
/**
* Json 转换 实体类 提示：FastJson在映射实体上非常棒， json有的K，实体没有，依然不影响解析..
*/
private void Json2Eetity() {
// TODO Auto-generated method stub
Welcome welcome = JSON.parseObject(json, Welcome.class);
System.out.println(welcome.toString());
System.out.println(welcome.getNickname());
}
/**
* 实体类 转换 Json
*/
private void Eetity2Json() {
// TODO Auto-generated method stub
Welcome welcome = new Welcome(2, 3, 4, 5, "imagUrl", 11, "Mers");
String json = JSON.toJSONString(welcome, true);
System.out.println("实体转换Json：" + json);
}
/**
* list集合转json格式字符串
*/
public void list2Json() {
List<Welcome> list = new ArrayList<Welcome>();
Welcome welcome1 = new Welcome(2, 3, 4, 5, "imagUrl", 11, "Mers");
Welcome welcome2 = new Welcome(22, 33, 44, 55, "imag", 65, "Kers");
Welcome welcome3 = new Welcome(64, 33, 34, 05, "imagUrl", 43, "Wers");
Welcome welcome4 = new Welcome(62, 75, 41, 25, "imagUrl", 109, "Oers");
list.add(welcome1);
list.add(welcome2);
list.add(welcome3);
list.add(welcome4);
String json = JSON.toJSONString(list, true);
System.out.println("ist集合转json格式字符串 :" + json);
}
/**
* String转换 JSONArray
* 并且去除null
*/
private void String2JSONArray() {
// TODO Auto-generated method stub
JSONArray array=JSONArray.parseArray(arrayAyy);
System.out.println(array);
System.out.println("长度: "+array.size());
Collection nuCon = new Vector();
nuCon.add(null);
array.removeAll(nuCon);
System.out.println(array);
System.out.println("长度: "+array.size());
}
public static void main(String[] args) {
FastJsonMain main = new FastJsonMain();
main.Json2Eetity();
System.out.println(" ");
main.Eetity2Json();
System.out.println("");
main.list2Json();
System.out.println(" ");
main.String2JSONArray();
}
}
package com.flag.app.Entity;
public class Welcome {
/**
* 报名的个数
*/
public int study_course_count;
/**
* 收到报名个数
*/
public int recieved_reg_form_count;
/**
* push推送课程报名个数
*/
public int unread_count;
/**
* 开设课程
*/
public int teach_course_count;
/**
* 用户头像
*/
public String avatar;
/**
* 用户ID
*/
public int user_id;
/**
* 用户名
*/
public String nickname;
public Welcome() {
super();
// TODO Auto-generated constructor stub
}
public Welcome(int study_course_count, int recieved_reg_form_count,
int unread_count, int teach_course_count, String avatar,
int user_id, String nickname) {
super();
this.study_course_count = study_course_count;
this.recieved_reg_form_count = recieved_reg_form_count;
this.unread_count = unread_count;
this.teach_course_count = teach_course_count;
this.avatar = avatar;
this.user_id = user_id;
this.nickname = nickname;
}
public int getStudy_course_count() {
return study_course_count;
}
public void setStudy_course_count(int study_course_count) {
this.study_course_count = study_course_count;
}
public int getRecieved_reg_form_count() {
return recieved_reg_form_count;
}
public void setRecieved_reg_form_count(int recieved_reg_form_count) {
this.recieved_reg_form_count = recieved_reg_form_count;
}
public int getUnread_count() {
return unread_count;
}
public void setUnread_count(int unread_count) {
this.unread_count = unread_count;
}
public int getTeach_course_count() {
return teach_course_count;
}
public void setTeach_course_count(int teach_course_count) {
this.teach_course_count = teach_course_count;
}
public String getAvatar() {
return avatar;
}
public void setAvatar(String avatar) {
this.avatar = avatar;
}
public int getUser_id() {
return user_id;
}
public void setUser_id(int user_id) {
this.user_id = user_id;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
@Override
public String toString() {
return "Welcome [study_course_count=" + study_course_count
+ ", recieved_reg_form_count=" + recieved_reg_form_count
+ ", unread_count=" + unread_count + ", teach_course_count="
+ teach_course_count + ", avatar=" + avatar + ", user_id="
+ user_id + ", nickname=" + nickname + "]";
}
}
执行的结果如下：
Welcome [study_course_count=10, recieved_reg_form_count=0, unread_count=5, teach_course_count=8, avatar=1316634098115-02-57, user_id=201, nickname=Asus人名]
Asus人名
实体转换Json：{
"avatar":"imagUrl",
"nickname":"Mers",
"recieved_reg_form_count":3,
"study_course_count":2,
"teach_course_count":5,
"unread_count":4,
"user_id":11
}
ist集合转json格式字符串 :[
{
"avatar":"imagUrl",
"nickname":"Mers",
"recieved_reg_form_count":3,
"study_course_count":2,
"teach_course_count":5,
"unread_count":4,
"user_id":11
},
{
"avatar":"imag",
"nickname":"Kers",
"recieved_reg_form_count":33,
"study_course_count":22,
"teach_course_count":55,
"unread_count":44,
"user_id":65
},
{
"avatar":"imagUrl",
"nickname":"Wers",
"recieved_reg_form_count":33,
"study_course_count":64,
"teach_course_count":5,
"unread_count":34,
"user_id":43
},
{
"avatar":"imagUrl",
"nickname":"Oers",
"recieved_reg_form_count":75,
"study_course_count":62,
"teach_course_count":25,
"unread_count":41,
"user_id":109
}
]
[[14,"小学语文"],[154,"美食"],[72,"高中物理"],null,[50,"高中化学"],[15,"小学数学"],[13,"英语"],null,[1,"其他英语培训"],null]
长度: 10
[[14,"小学语文"],[154,"美食"],[72,"高中物理"],[50,"高中化学"],[15,"小学数学"],[13,"英语"],[1,"其他英语培训"]]
长度: 7本文出自 “祝你幸福” 博客，请务必保留此出处http://zhunixingfu.blog.51cto.com/7430537/1628949
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