開(kāi)發(fā)過(guò)程中經(jīng)常會(huì)遇到j(luò)son數(shù)據(jù)的處理,而單獨(dú)對(duì)json數(shù)據(jù)進(jìn)行增刪改并不方便,下面這篇文章主要給大家介紹了關(guān)于使用Java獲取Json中的數(shù)據(jù),文中通過(guò)實(shí)例代碼介紹的非常詳細(xì),需要的朋友可以參考下

1.普通元素

getXxx()直接獲取

String jsonString = "{'name':'盧本偉','age':24}";
JSONObject json = JSON.parseObject(jsonString);
String name = json.getString("name");
int age = json.getIntValue("age");
System.out.println(name);
System.out.println(age);

2.屬性包含大括號(hào) {

先使用getJSONObject()獲取JSONObject對(duì)象，然后進(jìn)一步getXxx()解析屬性

String jsonString = "{'Hero':{'name':'Fizz','position':'Mid','charactor':'killer'}}";
JSONObject jsonObject = JSON.parseObject(jsonString);
JSONObject Hero = jsonObject.getJSONObject("Hero");
String name = Hero.getString("name");
String position = Hero.getString("position");
String charactor = Hero.getString("charactor");
System.out.println(name + "..." + position + "..." + charactor);

3.屬性包含中括號(hào) [

先使用getJSONArray()獲取JSONArray對(duì)象，然后進(jìn)一步遍歷

String jsonString = "{'nickNames':['五五開(kāi)','蘆葦','white']}";
JSONObject jsonObject = JSON.parseObject(jsonString);
JSONArray nickNames = jsonObject.getJSONArray("nickNames");
for(Object nickName:nickNames){
    System.out.println(nickName);
}

4.屬性中既有中括號(hào)包括，又嵌套了大括號(hào)

一層層獲取即可：先getJSONArray，然后getJSONObject，到了屬性，就是getXxx()

String jsonString = "{'Honors':[{'year':2011,'name':'TGA總決賽冠軍'},{'year':2013,'name':'S3全球總決賽中國(guó)區(qū)冠軍'},{'year':2013,'name':'S3全球總決賽亞軍'}]}";
JSONObject jsonObject = JSON.parseObject(jsonString);
JSONArray honors = jsonObject.getJSONArray("Honors");
for(int i=0; i<honors.size(); i++){
    JSONObject honor = (JSONObject) honors.get(i);
    int year = honor.getIntValue("year");
    String name = honor.getString("name");
    System.out.println(year + "..." + name);
}

補(bǔ)充：java提取json中某個(gè)數(shù)組的所有值

public class JsonExtracter {
    public static void main(String[] args) {
        String s = "{\"name\":\"a\",\"family\":[\"張三\",\"李四\"]}";
        JSONObject jsonObject = JSON.parseObject(s);

        //注意：family中的內(nèi)容帶有中括號(hào)[]，所以要轉(zhuǎn)化為JSONArray類(lèi)型的對(duì)象
        JSONArray family = jsonObject.getJSONArray("family");

        for (int i = 0; i < family.size(); i++) {
            //提取出family中的所有
            String s1 = (String) family.get(i);
            System.out.println("currentFamily:" + s1);
        }
    }