Question

我从php脚本中获取以下数据..

  {"errorno":"fe_200","message":"successful","univ":[{"univ_id":"1","univ_name":"abc","slug":"uptu","thumb":"http:\/\/www.fs.com\/notes\/img\/uptu.gif","table_prefix":"uptu"},{"univ_id":"2","univ_name":"def","slug":"gtu","thumb":"http:\/\/www.fs.com\/notes\/img\/gtu.gif","table_prefix":"gtu"},
    {"univ_id":"3","univ_name":"jvc university","slug":"jntu","thumb":"http:\/\/www.fs.com\/notes\/img\/jntu.gif","table_prefix":"jntu"}

    }]}

我想用GSON解析它。

我写了以下课程：

class WebsiteResults {

  public WebsiteResults() {}

  private String errorno;
  private String message;
  private List<univ> results;
  // other attributes

  public String getErrorNo() {
    return errorno;
  }
  public String getMessage() {
        return message;
      }
  public List<univ> getResults() { return results; }
  public void setErrorNo(String errorno) {
        this.errorno = errorno;
      }
  public void setMessage(String message) {
    this.message = message;
  }

  public void setResults(List<univ> results) { this.results = results; }
  public String toString() { return "Results[" + results + "]";}


  static class univ {
        private String univ_id;
        private String univ_name;
        public String getUnivID() { return univ_id; }
        public String getUnivName() { return univ_name; }
        public void setUnivID(String univ_id) { this.univ_id = univ_id; }
        public void setUnivName(String univ_name) { this.univ_name = univ_name; }
        public String toString() { return "Result[id:" + univ_id +",title:" + univ_name + "]"; }
    }

}

我想得到univ_id和univ_name的数组。

但我得到的结果= null。有人可以帮助解释我做错了什么。

WebsiteResults results = new Gson().fromJson(reader, WebsiteResults.class);
String errno = results.getErrorNo();
String result = results.toString();

Answer 1

WebsiteResults类中字段的名称必须与JSON匹配或具有@SerializedName注释才能告诉Gson它是什么：

变化：

private List<univ> results;

为：

private List<univ> univ;

或：

@SerializedName("univ")
private List<univ> results;

您使用univ类的小写名称这一事实也让人感到困惑;不要那样做。类名应以大写字母开头。

在java中解析gson中的数组

1 个答案: