小编gnj*_*ago的帖子

我有一个json字符串,我应该deSerialize到下面的类

class Data <T> {
    int found;
    Class<T> hits
}

我该怎么做？这是通常的方式

mapper.readValue(jsonString, Data.class);

但我如何提及T代表什么？

JSON字符串如下

{
   "rank":"-text_relevance",
   "match-expr":"(label 'star wars')",
   "hits":{
      "found":7,
      "start":0,
      "hit":[
         {"id":"tt1185834",
             "data":{
                "actor":["Abercrombie, Ian","Baker, Dee","Burton, Corey"],
                "title":["Star Wars: The Clone Wars"]
             }
         },
         .
         .
         .
         {"id":"tt0121766",
             "data":{
                "actor":["Bai, Ling","Bryant, Gene","Castle-Hughes, Keisha"],
                "title":["Star Wars: Episode III - Revenge of the Sith"]
             }
         }
       ]
    },
    "info":{
       "rid":"b7c167f6c2da6d93531b9a7b314ad030b3a74803b4b7797edb905ba5a6a08",
       "time-ms":2,
       "cpu-time-ms":0
    }
    } 

它有很多字段,但我只想要数据字段.这不起作用:

mapper.readvalue(jsonString,Data.class); 

如何让杰克逊只阅读"数据"字段？

我错误地发布了这个问题.我在这里正确地发布了这个问题......

我得到一个json字符串作为HTTP响应.我知道它的结构.它如下:

public class Json<T> {
    public Hits<T> hits;
}
public class Hits<T> {
    public int found;
    public int start;
    public ArrayList<Hit<T>> hit;
}
public class Hit<T> {
    public String id;
    public Class<T> data;
}

"数据"字段可以属于任何类.我只会在运行时知道它.我会把它作为一个参数.这就是我反序列化的方式.

public <T> void deSerialize(Class<T> clazz) {
    ObjectMapper mapper = new ObjectMapper();
    mapper.readValue(jsonString,  new TypeReference<Json<T>>() {});
}

但是我收到了一个错误 -

无法从java.lang.class访问私有java.lang.class.Class().无法设置访问权限.无法使java.lang.Class构造函数可访问

我无法在Ubuntu上的R 3.0.2中安装ggp​​lot2.

我跑的时候

install.packages('ggplot2',dependencies = TRUE)

我收到以下错误.

 > install.packages('ggplot2',dependencies = TRUE)
Installing package into ‘/home/gowthamn/R/x86_64-pc-linux-gnu-library/3.0’
(as ‘lib’ is unspecified)
Warning in install.packages :
  dependencies ‘plyr’, ‘testthat’ are not available
also installing the dependencies ‘reshape2’, ‘scales’, ‘Hmisc’

trying URL 'http://cran.rstudio.com/src/contrib/reshape2_1.4.1.tar.gz'
Content type 'application/x-gzip' length 34693 bytes (33 Kb)
opened URL
==================================================
downloaded 33 Kb

trying URL 'http://cran.rstudio.com/src/contrib/scales_0.2.4.tar.gz'
Content type 'application/x-gzip' length 40093 bytes (39 Kb)
opened URL
==================================================
downloaded 39 Kb

trying URL 'http://cran.rstudio.com/src/contrib/Hmisc_3.16-0.tar.gz'
Content type 'application/x-gzip' length 629536 bytes (614 …