解析多嵌套JSON与GSON

问题描述：

我不得不解析JSON文件转换成文本文件，如下面的示例JSON文件，解析多嵌套JSON与GSON

{ 
    "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"] 
                } 
               ] 
           } 
        } 
       ] 
}

我用GSON通过创建下面的Java解析文件类。

通道
LiveChannel
程序
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; 
    } 

}

此后如何从程序开始解析逻辑。

“程序”： { “TOTALITEMS”：1，

program.java

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; 
    } 

}

和主要的样子下方，

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()); 
     } 

    } 

}

任何人都可以请求帮助获取从livechannel类向前解析程序的逻辑。

由于程序不是数组列表，因此程序还不是一个数组列表，还有什么其他方法可以获取值。

答

您缺少liveChannels课程中的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，你需要将sub_programs场重命名为programs

public class programs { 

    ArrayList<sub_programs> programs; 

    ... 
}

顺便说一句，你的班级命名不遵循Java标准，被认为是不好的做法。你的类应该被命名为这样的：

Channel 
LiveChannel 
Program 
SubProgram

请注意，这不会影响GSON的解析您的文件的能力作为GSON更关心比它的字段的实际类名称的属性名称。

解析多嵌套JSON与GSON

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