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我怎样才能达到这个使用jackson jsonNode并获得所需的输出(How can I achieve this using jackson jsonNode and get the desired output)
我怎样才能达到这个使用jackson jsonNode并获得所需的输出(How can I achieve this using jackson jsonNode and get the desired output)
Json回应
{ "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": { "$": "false" } } ] } }现在，我想通过浏览这个json响应来检查两个条件，即首先从上面的json字符串中获取@totalCount
第二个条件，遍历每个文件节点并查看
if（myrepoName.equals（json response repository name））然后从链接节点获取存储库的内容url。
{ "@rel": "content", "$": "content.url" <--- }我的代码：
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("/$").asText(); if (repoName.equals(name)) { logger.info("Got it"); //get the content URL from link node //missing code logger.info("Returning " + contentURL + " for repo " + repoName); break; } } } } } catch (IOException e) { e.printStackTrace(); }Json response
{ "searchResults": { "@xmlns": { "dvi": "http://localhsot.com/ns/1.0", "$": "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" } } ] } }Now, I want to check two condition by travesing this json response i.e., First get the @totalCount from the above json string
second condition, loop through each file node and see
if(myrepoName.equals(json response repository name) then get the content url for repository from link node. which is this
{ "@rel": "content", "$": "content.url" <--- }My Code:
try { JsonNode jsonNode = new ObjectMapper().readTree(response.prettyPrint()); int totalCount = jsonNode.at("/searchResults/@totalCount").asInt(); logger.info("Search returned " + totalCount + " results"); if(totalCount > 0) { JsonNode filesNode = jsonNode.at("/searchResults/file"); logger.info("Result: " + filesNode); if(filesNode.isObject()) { Iterator<JsonNode> filesIterator = filesNode.elements(); while (filesIterator.hasNext()) { // what i'm trying to get here is this JsonNode fileNode = filesIterator.next(); Object name = fileNode.at("/$").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(); }
原文：https://stackoverflow.com/questions/41655924
更新时间：2022-07-28 08:07
最满意答案
你将C样式字符串（
char指针）传递给std::istringstream构造函数，它实际上实例化了一个std::string并传递了它。 这是由于隐式转换而发生的。std::string的转换构造函数将C样式字符串中的空字节字符解释为字符串终止符的结尾，从而导致忽略它后面的所有字符。为了避免这种情况，您可以显式构造一个
std::string指定数据的大小并将其传递给std::istringstreamchar bin[] = {0x30, 0xb, 0x0, 0x6, 0x6, 0x2b, 0xc, 0x89, 0x36, 0x84, 0x13, 0xa, 0x1}; std::istringstream strm(std::string(bin, sizeof(bin) / sizeof(bin[0])));
注意：我不确切知道你要完成什么，但我建议使用
std::vector而不是原始字符缓冲区。What you pass a C style string (
charpointer) to thestd::istringstreamconstructor it actually instantiates astd::stringand passes that instead. This happens due to an implicit conversion. The conversion constructor ofstd::stringinterprets a null byte character in C style strings as an end of string terminator causing all characters after it to be ignored.To avoid this you can explicitly construct a
std::stringspecifying the size of the data and pass it tostd::istringstreamchar bin[] = {0x30, 0xb, 0x0, 0x6, 0x6, 0x2b, 0xc, 0x89, 0x36, 0x84, 0x13, 0xa, 0x1}; std::istringstream strm(std::string(bin, sizeof(bin) / sizeof(bin[0])));
Note: I don't know exactly what you are trying to accomplish but I recommend using
std::vectorinstead of a raw character buffer if possible.
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