どのように私はジャクソンjsonNodeを使用してこれを達成し、所望の出力

Question

JSONレスポンス今

{ 
    "searchResults": { 
     "@xmlns": { 
      "dvi": "http://localhsot.com/ns/1.0", 
      "$": "http://localhsot.com/ns/1.0", 
      "a": "http://alternate.localhsot.com/ns/1.0" 
     }, 
     "@totalCount": "2", 
     "file": [ 
      { 
       "link": [ 
        { 
         "@rel": "file", 
         "$": "file.url" 
        }, 
        { 
         "@rel": "content", 
         "$": "content.url" 
        }, 
        { 
         "@rel": "repository", 
         "$": "repository.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "320", 
         "@a:height": "320", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "64", 
         "@a:height": "64", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "24", 
         "@a:height": "24", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "128", 
         "@a:height": "128", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        } 
       ], 
       "name": { 
        "$": "gullfoss.jpg" 
       }, 
       "parentPath": { 
        "$": "/" 
       }, 
       "size": { 
        "$": "91345" 
       }, 
       "versionCreated": { 
        "$": "2017-01-13T16:38:20.059Z" 
       }, 
       "systemAttribute": [ 
        { 
         "@name": "Geo-Latitude", 
         "$": "47.6065" 
        }, 
        { 
         "@name": "Geo-Longitude", 
         "$": "22.99514" 
        }, 
        { 
         "@name": "Height", 
         "$": "579" 
        }, 
        { 
         "@name": "Mime-Type", 
         "$": "image/jpeg" 
        }, 
        { 
         "@name": "Timeline-Date", 
         "$": "-0091-03-27T04:26:40.000Z" 
        }, 
        { 
         "@name": "Width", 
         "$": "680" 
        } 
       ], 
       "attributesChanged": { 
        "$": "false" 
       }, 
       "deleted": { 
        "$": "false" 
       }, 
       "repository": { 
        "$": "VZMOBILE_13psb6j" 
       }, 
       "checksum": { 
        "$": "5d828c1d94b2569ff1bf60a9ebe9cd2de8ae8e6a9ad7d77d678c1766c78957c5" 
       }, 
       "extension": { 
        "$": "jpg" 
       }, 
       "fileAttribute": [ 
        { 
         "@name": "ContentPermissions", 
         "$": "SHARE" 
        }, 
        { 
         "@name": "Width", 
         "$": "680" 
        }, 
        { 
         "@name": "CI_COMPLETE", 
         "$": "true" 
        }, 
        { 
         "@name": "DRM_PROTECTED", 
         "$": "false" 
        }, 
        { 
         "@name": "Height", 
         "$": "579" 
        } 
       ], 
       "contentToken": { 
        "$": "AHYLsb1sK9iy1Rn3yS4mQiM5pFL--AyTjY3i5G-zzdOm68QzB_GILrt1pXgfdEkUcPZZ5tUpn1Ih3j9wyfywIVY~" 
       }, 
       "contentAccessible": { 
        "$": "true" 
       }, 
       "contentChanged": { 
        "$": "false" 
       } 
      }, 
      { 
       "link": [ 
        { 
         "@rel": "file", 
         "$": "file.url" 
        }, 
        { 
         "@rel": "content", 
         "$": "content.url" 
        }, 
        { 
         "@rel": "repository", 
         "$": "repository.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "320", 
         "@a:height": "320", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "64", 
         "@a:height": "64", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "24", 
         "@a:height": "24", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        }, 
        { 
         "@rel": "content.alternate", 
         "@a:width": "128", 
         "@a:height": "128", 
         "@a:imageFormat": "jpeg", 
         "@a:mimeType": "image/jpeg", 
         "@a:size": "-1", 
         "$": "some.url" 
        } 
       ], 
       "name": { 
        "$": "gullfoss.jpg" 
       }, 
       "parentPath": { 
        "$": "/Folder" 
       }, 
       "size": { 
        "$": "91345" 
       }, 
       "versionCreated": { 
        "$": "2017-01-13T16:38:59.728Z" 
       }, 
       "systemAttribute": [ 
        { 
         "@name": "Geo-Latitude", 
         "$": "47.6065" 
        }, 
        { 
         "@name": "Geo-Longitude", 
         "$": "22.99514" 
        }, 
        { 
         "@name": "Height", 
         "$": "579" 
        }, 
        { 
         "@name": "Mime-Type", 
         "$": "image/jpeg" 
        }, 
        { 
         "@name": "Timeline-Date", 
         "$": "-0091-03-27T04:26:40.000Z" 
        }, 
        { 
         "@name": "Width", 
         "$": "680" 
        } 
       ], 
       "attributesChanged": { 
        "$": "false" 
       }, 
       "deleted": { 
        "$": "false" 
       }, 
       "repository": { 
        "$": "VZMOBILE_13psb6j" 
       }, 
       "checksum": { 
        "$": "5d828c1d94b2569ff1bf60a9ebe9cd2de8ae8e6a9ad7d77d678c1766c78957c5" 
       }, 
       "extension": { 
        "$": "jpg" 
       }, 
       "fileAttribute": [ 
        { 
         "@name": "ContentPermissions", 
         "$": "SHARE" 
        }, 
        { 
         "@name": "Width", 
         "$": "680" 
        }, 
        { 
         "@name": "CI_COMPLETE", 
         "$": "true" 
        }, 
        { 
         "@name": "DRM_PROTECTED", 
         "$": "false" 
        }, 
        { 
         "@name": "Height", 
         "$": "579" 
        } 
       ], 
       "contentToken": { 
        "$": "AHYLsb1sK9iy1Rn3yS4mQiM5pFL--AyTjY3i5G-zzdOm68QzB_GILrt1pXgfdEkUcPZZ5tUpn1Ih3j9wyfywIVY~" 
       }, 
       "contentAccessible": { 
        "$": "true" 
       }, 
       "contentChanged": { 
        "$": "false" 
       } 
      } 
     ] 
    } 
} 

を得ることができ、私はつまり、このJSONレスポンスをtravesingことにより、2つの状態を確認したい、まず上記のJSON文字列から@totalCountを取得

第二の条件は、各ファイルノードをループと参照

（myrepoName.equals（JSONレスポンスリポジトリ名） 、リンクノードからリポジトリのコンテンツのURLを取得する場合。この

あります

{ 
    "@rel": "content", 
    "$": "content.url" <--- 
} 

マイコード：すべての

try { 
    JsonNode jsonNode = new ObjectMapper().readTree(response.prettyPrint()); 
    int totalCount = jsonNode.at("/searchResults/@totalCount").asInt(); 
    logger.info("Search returned " + totalCount + " results"); 
    if(totalCount > 0) { 
     JsonNode filesNode = jsonNode.at("/searchResults/file"); 
     logger.info("Result: " + filesNode); 
     if(filesNode.isObject()) { 
      Iterator<JsonNode> filesIterator = filesNode.elements(); 
      while (filesIterator.hasNext()) 
      { 
       // what i'm trying to get here is this 
       JsonNode fileNode = filesIterator.next(); 
       Object name = fileNode.at("/$").asText(); 
       if (repoName.equals(name)) { 
        logger.info("Got it"); 
        //get the content URL from link node 
        //missing code 
        logger.info("Returning " + contentURL + " for repo " + repoName); 
        break; 
       } 
      } 
     } 
    } 
} catch (IOException e) { 
    e.printStackTrace(); 
} 

Answer 1

まず、JSONノードfilesNodeはJSONオブジェクトではありません。あなたの例でわかるように、このノードは構造体"file": [ ... ]です。これはJSON配列です。だから、ファイルノードが配列の場合、次に進み、if文を変更する必要があります。

// wrong 
if (filesNode.isObject()) { 
    ... 
} 

// correct 
if (filesNode.isArray()) { 
    ... 
} 

を第二に、あなたがチェックするためにJSONオブジェクトfile内JSONノードrepositoryを強要する必要がある場合の名前レポが正しい：

// 
// }, 
// "repository": { 
//  "$": "VZMOBILE_13psb6j" 
// }, 
// 
String repoName = fileNode.at("/repository/$").asText(); 
if (repoName.equals(targetRepoName)) { 

第三に、あなたはコンテンツリンクを見つけるために、JSONオブジェクトfile内JSONノードlinkを強要する必要があります。

for (JsonNode linkNode : linksNode) { 
    if ("content".equals(linkNode.get("@rel").asText())) { 
     return linkNode.get("$").asText(); 
    } 
} 

ここにコード全体があります。

// ... 
JsonNode filesNode = jsonNode.at("/searchResults/file"); 
if (filesNode.isArray()) { 

    for (JsonNode fileNode : filesNode) { 
    String repoName = fileNode.at("/repository/$").asText(); 
    if (repoName.equals(targetRepoName)) { 

     for (JsonNode linkNode : fileNode.at("/link")) { 
     if ("content".equals(linkNode.get("@rel").asText())) { 
      contentURL = linkNode.get("$").asText(); 
     } 
     } 
    } 
    } 
}