使用java收集Json对象和数组时出现问题

首先，我是新手，所以请原谅我。我一直在开发一个音乐应用程序，我正在尝试解析来自流媒体链接的JSON代码，并向我的应用程序用户显示歌曲的“艺术家”姓名和“标题”。但我在收集数据时遇到了问题。 以下是我在流链接中的JSON代码：

{"type":"result","data":[{"title":"My Stream ","song":"Unknown - The Authorised One","track":{"artist":"Unknown Artist","title":"The Authorised One","album":"Unknown","royaltytrackid":181938.0000,"started":1498151105,"id":181938,"length":0,"playlist":{"id":3520,"title":"Rev Arome E. Adah"},"buyurl":"https:\/\/itunes.apple.com\/us\/album\/the-unknown-god\/id772022436?uo=4","imageurl":"http:\/\/is5.mzstatic.com\/image\/thumb\/Music5\/v4\/d7\/6d\/52\/d76d52df-db43-7130-0e37-62241ff50a21\/source\/100x100bb.jpg"},"bitrate":"128 Kbps","server":"Online","autodj":"Online","source":"Yes","offline":false,"summary":"<a href=\"http:\/\/cp9.serverse.com:2199\/tunein\/-stream\/svhxmwhp.pls\">Eloti Designs Stream - Unknown - The Authorised One<\/a>","listeners":0,"maxlisteners":1000,"reseller":0,"serverstate":true,"sourcestate":true,"sourceconn":1,"date":"Jun 22, 2017","time":"07:06 PM","rawmeta":"Unknown - The Authorised One ","mountpoint":"\/stream","tuneinurl":"http:\/\/209.133.216.3:7550\/stream","directtuneinurl":"","proxytuneinurl":"http:\/\/209.133.216.3\/proxy\/svhxmwhp?mp=\/stream","tuneinformat":"mp3","webplayer":"muses","servertype":"ShoutCast2","listenertotal":0,"url":"http:\/\/cp9.serverse.com:2199\/rpc"}]

---

track

是一个包含

artist

的jsonobject，并且

track

位于

数据

数组，因此提取

轨迹

然后从中提取

艺术家

String songName = finalObject.getJSONObject("track").getString("artist");

{
    "type":"result",
    "data":[                            // fetch JSONArray
        {                               // fetch first JSONObject
             "title":"My Stream ","song":"Unknown - The Authorised One",
             "track":{                  // fetch track JSONObject
                  "artist":"Unknown .." // fetch string 

---

你试过jackson解析器吗？它非常易于使用，并且可以轻松解析上面的字符串。您只需创建映射结构的3/4 POJO类，然后将映射器的readValue函数应用于外部类。下面是一个小示例，其中包含一个列表和一个内部类：

import java.io.IOException;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

class OutterPojo {

    public String aString;
    public List<InnerPojo> aList;

    public String getaString() {
        return aString;
    }

    public void setaString(String aString) {
        this.aString = aString;
    }

    public List<InnerPojo> getaList() {
        return aList;
    }

    public void setaList(List<InnerPojo> aList) {
        this.aList = aList;
    }

    @Override
    public String toString() {
        return new StringBuilder().append("{ #OutterPojo# ").append("aString:").append(aString).append(", ").append("aList:")
                .append(aList).append(" }").toString();
    }
}

class InnerPojo {

    public String anotherString;

    public String getanotherString() {
        return anotherString;
    }

    public void setanotherString(String anotherString) {
        this.anotherString = anotherString;
    }

    @Override
    public String toString() {
        return new StringBuilder().append("{ #InnerPojo# ").append("anotherString:").append(anotherString).append(" }")
                .toString();
    }
}

public class Test {

    public static void main(String args[]) throws JsonParseException, JsonMappingException, IOException {
        String jsonData = "{\"aString\":\"s\",\"aList\":[{\"anotherString\":\"ss\"},{\"anotherString\":\"sss\"}]}";
        ObjectMapper objectMapper = new ObjectMapper();
        OutterPojo testObject = objectMapper.readValue(jsonData, OutterPojo.class);
        System.out.println(testObject);
    }

}

import java.io.IOException；
导入java.util.List；
导入com.fasterxml.jackson.core.JsonParseException；
导入com.fasterxml.jackson.databind.JsonMappingException；
导入com.fasterxml.jackson.databind.ObjectMapper；
OutterPojo类{
公共字符串搜索；
公开名单；
公共字符串getaString（）{
回程收缩；
}
公共无效设置限制（字符串限制）{
这个。收敛=收敛；
}
公共列表getaList（）{
回归主义者；
}
公共无效集合列表（列表列表列表）{
this.aList=aList；
}
@凌驾
公共字符串toString（）{
返回新的StringBuilder（）
.append（aList.append（“}”）.toString（）；
}
}
类InnerPojo{
公共字符串另一个字符串；
公共字符串getanotherString（）{
返回另一个字符串；
}
public void setanotherString（字符串anotherString）{
this.anotherString=另一个字符串；
}
@凌驾
公共字符串toString（）{
返回新的StringBuilder（）.append（{#InnerPojo#'）.append（“另一个字符串：”）.append（另一个字符串）.append（“}”）
.toString（）；
}
}
公开课考试{
公共静态void main（字符串args[]）抛出JsonParseException、JsonMappingException、IOException{
字符串jsonData=“{\'aString\'：\'s\'，\'aList\'：[{\'anotherString\'：\'ss\'}，{\'anotherString\'：\'sss\'}]；
ObjectMapper ObjectMapper=新的ObjectMapper（）；
OutterPojo testObject=objectMapper.readValue（jsonData，OutterPojo.class）；
System.out.println（testObject）；
}
}

至于依赖关系，您只需要jackson core、jackson databind和jackson annotations即可实现此功能-以下是指向maven的链接：

---

希望有帮助！：）

我很高兴我能帮上忙，保持安全：）

import java.io.IOException;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

class OutterPojo {

    public String aString;
    public List<InnerPojo> aList;

    public String getaString() {
        return aString;
    }

    public void setaString(String aString) {
        this.aString = aString;
    }

    public List<InnerPojo> getaList() {
        return aList;
    }

    public void setaList(List<InnerPojo> aList) {
        this.aList = aList;
    }

    @Override
    public String toString() {
        return new StringBuilder().append("{ #OutterPojo# ").append("aString:").append(aString).append(", ").append("aList:")
                .append(aList).append(" }").toString();
    }
}

class InnerPojo {

    public String anotherString;

    public String getanotherString() {
        return anotherString;
    }

    public void setanotherString(String anotherString) {
        this.anotherString = anotherString;
    }

    @Override
    public String toString() {
        return new StringBuilder().append("{ #InnerPojo# ").append("anotherString:").append(anotherString).append(" }")
                .toString();
    }
}

public class Test {

    public static void main(String args[]) throws JsonParseException, JsonMappingException, IOException {
        String jsonData = "{\"aString\":\"s\",\"aList\":[{\"anotherString\":\"ss\"},{\"anotherString\":\"sss\"}]}";
        ObjectMapper objectMapper = new ObjectMapper();
        OutterPojo testObject = objectMapper.readValue(jsonData, OutterPojo.class);
        System.out.println(testObject);
    }

}