用GSON解析多嵌套json

Question

我必须将json文件解析为文本文件，示例json文件如下所示，

 { "link":"https://xxx.nt", "liveChannels":[ { "name":"Sony TV", "id":1004, "link":"https://xxx.nt", "decryptionTicket":"https://xxxy.nt", "viewLevel":"Too High", "programs": { "totalItems":1, "programs":[ { "name":"Live or die", "id":1000000000, "catchUp":["FUN"], "startOver":["Again"] } ] } } ] } 

我已经使用GSON通过创建以下java类来解析文件。

1. 渠道
2. 直播频道
3. 程式
4. 子程序

Channel.java

public class channel 
{

    String link = null;
    ArrayList<liveChannels> liveChannels;

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public ArrayList<liveChannels> getliveChannels() {
        return liveChannels;
    }

    public void setliveChannels(ArrayList<liveChannels> liveChannels) {
        this.liveChannels = liveChannels;
    }

}

livechannel.java

public class liveChannels {

    String name = null;
    int id;
    String link = null;
    String decryptionTicket = null;
    String viewLevel = null;


    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getLink() {
        return link;
    }

    public void setLink(String link) {
        this.link = link;
    }

    public String getDecryptionTicket() {
        return decryptionTicket;
    }

    public void setDecryptionTicket(String decryptionTicket) {
        this.decryptionTicket = decryptionTicket;
    }

    public String getViewLevel() {
        return viewLevel;
    }

    public void setViewLevel(String viewLevel) {
        this.viewLevel = viewLevel;
    }

}

之后，如何从程序开始解析逻辑。

“程序”：{“ totalItems”：1，

程式库

public class programs {

    ArrayList<sub_programs> sub_programs;

    int totalItems;

    public int getTotalItems() {
        return totalItems;
    }

    public void setTotalItems(int totalItems) {
        this.totalItems = totalItems;
    }

    public ArrayList<sub_programs> getProgramsDetails() {
        return sub_programs;
    }

    public void setProgramsDetails(ArrayList<sub_programs> sub_programs) {
        this.sub_programs = sub_programs;
    }

}

sub_program.java

public class sub_programs {

    String name = null;
    int id;
    String catchUp = null;
    String startOver = null;


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getCatchUp() {
        return catchUp;
    }

    public void setCatchUp(String catchUp) {
        this.catchUp = catchUp;
    }

    public String getStartOver() {
        return startOver;
    }

    public void setStartOver(String startOver) {
        this.startOver = startOver;
    }

}

主要外观如下

    public static void main(String[] args) throws IOException 
    {

        Gson gson = new Gson();

        String contents = FileUtils.readFileToString(
                new File("C:/sample.json"), "UTF-8");

        channel channelHeader = gson.fromJson(contents, channel.class);

        System.out.println("Channel Information --->");

        System.out.println("Channel Link: " + channelHeader.getLink());

        ArrayList<liveChannels> liveChannels = channelHeader.getliveChannels();

        for (int i = 0; i < liveChannels.size(); i++) {
            System.out.println("liveChannels Detail --->");
            liveChannels liveChannelsDetail = liveChannels.get(i);
            System.out.println("Channel Name : " + liveChannelsDetail.getName());
            System.out.println("Channel ID : " + liveChannelsDetail.getId());
            System.out.println("Channel Description Ticket: " + liveChannelsDetail.getDecryptionTicket());
            System.out.println("Channel View Level : " + liveChannelsDetail.getViewLevel());
        }

    }

}

任何人都可以帮助获得从livechannel类开始解析程序的逻辑。

由于程序不是数组列表，因此还有其他方法来获取值。

Answer 1

您缺少liveChannels类中的programs对象。

public class liveChannels {

    String name = null;
    int id;
    String link = null;
    String decryptionTicket = null;
    String viewLevel = null;
    programs programs;

    public void setPrograms (programs programs) {
        this.programs = programs;
    }

    public programs getPrograms() {
        return programs;
    }

    ...
}

然后在programs类中，您需要将sub_programs字段重命名为programs

public class programs {

    ArrayList<sub_programs> programs;

    ...
}

顺便说一句，您的类命名不遵循Java标准，被认为是不好的做法。 您的类应这样命名：

Channel
LiveChannel
Program
SubProgram

请注意，这不会影响GSON解析文档的能力，因为GSON更关心属性名而不是字段的实际类名。