{"id":401,"date":"2023-03-23T07:30:50","date_gmt":"2023-03-23T07:30:50","guid":{"rendered":"https:\/\/yunshangtulv.com.cn\/?p=401"},"modified":"2023-03-23T07:30:50","modified_gmt":"2023-03-23T07:30:50","slug":"json%e6%96%87%e4%bb%b6%e8%af%a6%e8%a7%a3%e5%8f%8a%e5%ba%94%e7%94%a8%e5%ae%9e%e4%be%8b","status":"publish","type":"post","link":"https:\/\/yunshangtulv.com.cn\/?p=401","title":{"rendered":"json\u6587\u4ef6\u8be6\u89e3\u53ca\u5e94\u7528\u5b9e\u4f8b"},"content":{"rendered":"

R\u8bed\u8a00\u4e2d\u53ef\u4ee5\u4f7f\u7528jsonlite<\/code>\u5305\u6765\u5904\u7406JSON\u6587\u4ef6\u3002jsonlite<\/code>\u5305\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u51fd\u6570\uff0c\u7528\u4e8e\u8bfb\u53d6\u3001\u89e3\u6790\u3001\u64cd\u4f5c\u548c\u5199\u5165JSON\u6587\u4ef6\u3002\u9996\u5148\uff0c\u786e\u4fdd\u5df2\u7ecf\u5b89\u88c5\u4e86jsonlite<\/code>\u5305\u3002\u5982\u679c\u6ca1\u6709\u5b89\u88c5\uff0c\u8bf7\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n

\n
<\/div>\n
install.packages(<\/span>\"jsonlite\"<\/span>)<\/span>
\n<\/code><\/div>\n<\/div>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u901a\u8fc7\u4e00\u4e9b\u5e94\u7528\u5b9e\u4f8b\u6765\u8be6\u7ec6\u89e3\u91caR\u8bed\u8a00\u7684JSON\u6587\u4ef6\u64cd\u4f5c\u3002<\/p>\n

    \n
  1. \u8bfb\u53d6\u548c\u89e3\u6790JSON\u6587\u4ef6<\/li>\n<\/ol>\n

    \u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0bJSON\u6587\u4ef6\uff08data.json\uff09\uff1a<\/p>\n

    \n
    <\/div>\n
    {<\/span>
    \n \"employees\"<\/span>:<\/span> [<\/span>
    \n {<\/span>
    \n \"name\"<\/span>:<\/span> \"John Doe\"<\/span>,<\/span>
    \n \"age\"<\/span>:<\/span> 30<\/span>,<\/span>
    \n \"position\"<\/span>:<\/span> \"Software Engineer\"<\/span>
    \n }<\/span>,<\/span>
    \n {<\/span>
    \n \"name\"<\/span>:<\/span> \"Jane Smith\"<\/span>,<\/span>
    \n \"age\"<\/span>:<\/span> 28<\/span>,<\/span>
    \n \"position\"<\/span>:<\/span> \"Data Analyst\"<\/span>
    \n }<\/span>,<\/span>
    \n {<\/span>
    \n \"name\"<\/span>:<\/span> \"Mike Brown\"<\/span>,<\/span>
    \n \"age\"<\/span>:<\/span> 35<\/span>,<\/span>
    \n \"position\"<\/span>:<\/span> \"Project Manager\"<\/span>
    \n }<\/span>
    \n ]<\/span>
    \n}<\/span>
    \n<\/code><\/div>\n<\/div>\n

    \u9996\u5148\uff0c\u4f7f\u7528fromJSON<\/code>\u51fd\u6570\u8bfb\u53d6\u5e76\u89e3\u6790JSON\u6587\u4ef6\uff1a<\/p>\n

    \n
    <\/div>\n
    library(<\/span>jsonlite)<\/span><\/p>\n

    # \u8bfb\u53d6\u5e76\u89e3\u6790JSON\u6587\u4ef6<\/span>
    \njson_data <-<\/span> fromJSON(<\/span>\"data.json\"<\/span>)<\/span>
    \n<\/code><\/div>\n<\/div>\n

      \n
    1. \u63d0\u53d6JSON\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/li>\n<\/ol>\n

      \u5728\u89e3\u6790JSON\u6587\u4ef6\u540e\uff0c\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6570\u636e\u6846\u4e2d\u7684\u6570\u636e\u3002\u4f8b\u5982\uff0c\u63d0\u53d6\u6240\u6709\u5458\u5de5\u7684\u59d3\u540d\uff1a<\/p>\n

      \n
      <\/div>\n
      # \u63d0\u53d6\u6240\u6709\u5458\u5de5\u7684\u59d3\u540d<\/span>
      \nnames<\/span> <-<\/span> json_data$<\/span>employees$<\/span>name<\/p>\n

      print(<\/span>names<\/span>)<\/span>
      \n<\/code><\/div>\n<\/div>\n

        \n
      1. \u64cd\u4f5cJSON\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/li>\n<\/ol>\n

        \u4f7f\u7528jsonlite<\/code>\u5305\u4e2d\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u5bf9JSON\u6570\u636e\u8fdb\u884c\u64cd\u4f5c\uff0c\u5982\u6dfb\u52a0\u3001\u4fee\u6539\u6216\u5220\u9664\u6570\u636e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5411JSON\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684\u5458\u5de5\uff1a<\/p>\n

        \n
        <\/div>\n
        # \u521b\u5efa\u65b0\u7684\u5458\u5de5\u6570\u636e<\/span>
        \nnew_employee <-<\/span> data.frame(<\/span>name =<\/span> \"Alice Johnson\"<\/span>,<\/span> age =<\/span> 32<\/span>,<\/span> position =<\/span> \"HR Specialist\"<\/span>)<\/span><\/p>\n

        # \u5c06\u65b0\u6570\u636e\u6dfb\u52a0\u5230JSON\u6587\u4ef6<\/span>
        \njson_data$<\/span>employees <-<\/span> rbind(<\/span>json_data$<\/span>employees,<\/span> new_employee)<\/span><\/p>\n

        # \u67e5\u770b\u66f4\u65b0\u540e\u7684JSON\u6570\u636e<\/span>
        \nprint(<\/span>json_data)<\/span>
        \n<\/code><\/div>\n<\/div>\n

          \n
        1. \u5c06\u4fee\u6539\u540e\u7684JSON\u6570\u636e\u5199\u5165\u6587\u4ef6<\/li>\n<\/ol>\n

          \u6700\u540e\uff0c\u5c06\u4fee\u6539\u540e\u7684JSON\u6570\u636e\u5199\u5165\u6587\u4ef6\u3002\u4f7f\u7528toJSON<\/code>\u51fd\u6570\u8f6c\u6362\u6570\u636e\u6846\u4e3aJSON\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u4f7f\u7528writeLines<\/code>\u51fd\u6570\u5c06JSON\u5b57\u7b26\u4e32\u5199\u5165\u6587\u4ef6\uff1a<\/p>\n

          \n
          <\/div>\n
          # \u5c06\u6570\u636e\u6846\u8f6c\u6362\u4e3aJSON\u5b57\u7b26\u4e32<\/span>
          \nupdated_json <-<\/span> toJSON(<\/span>json_data,<\/span> pretty =<\/span> TRUE<\/span>)<\/span><\/p>\n

          # \u5c06JSON\u5b57\u7b26\u4e32\u5199\u5165\u65b0\u6587\u4ef6<\/span>
          \nwriteLines(<\/span>updated_json,<\/span> \"updated_data.json\"<\/span>)<\/span>
          \n<\/code><\/div>\n<\/div>\n

          \u901a\u8fc7\u4ee5\u4e0a\u793a\u4f8b\uff0c\u6211\u4eec\u4e86\u89e3\u4e86\u5982\u4f55\u5728R\u8bed\u8a00\u4e2d\u5904\u7406JSON\u6587\u4ef6\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cJSON\u6587\u4ef6\u7684\u7ed3\u6784\u548c\u5185\u5bb9\u53ef\u80fd\u66f4\u4e3a\u590d\u6742\uff0c\u4f46\u57fa\u672c\u7684\u8bfb\u53d6\u3001\u89e3\u6790\u3001\u64cd\u4f5c\u548c\u5199\u5165\u65b9\u6cd5\u662f\u76f8\u4f3c\u7684\u3002\u66f4\u591a\u5173\u4e8ejsonlite<\/code>\u5305\u7684\u4fe1\u606f\uff0c\u53ef\u4ee5\u67e5\u9605\u76f8\u5173\u6587\u6863\u6216\u8bbf\u95ee\u4ee5\u4e0b\u94fe\u63a5\uff1a<\/p>\n