fastjson 从jsonArray中获取、遍历jsonObject属性
fastjson
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项目地址:https://gitcode.com/gh_mirrors/fastj/fastjson
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1.json字符串转jsonArray
JSONArray json = JSONArray.parseArray(json_String);
2.jsonArray到jsonObject的转换
for (int i = 0; i < jsonArray.size(); i++)
{
row = sheet.createRow(num++);
JSONObject object = (JSONObject) jsonArray.get(i);
object.getString('属性');
}
JSONArray query_rewrite_list = response.getJSONArray("query_rewrite");
StringBuffer sb_query = new StringBuffer();
StringBuffer sb_score = new StringBuffer();
String tagging分词query = "";
String tagging分词score = "";
// 遍历JSONArray下的JSONObject,以及String类型的value值
for (int i = 0; i < query_rewrite_list.size(); i++) {
String query_rewrite_extention = response.getJSONArray("query_rewrite").
getJSONObject(i).getString("extention");
String query_rewrite_level = response.getJSONArray("query_rewrite").
getJSONObject(i).getString("level");
System.out.println("第" + (i + 1) + "个getJSONObject的extention为" + query_rewrite_extention);
System.out.println("第" + (i + 1) + "个getJSONObject的level为" + query_rewrite_level);
tagging分词query = sb_query.append(query_rewrite_extention + ",").toString();
tagging分词score = sb_score.append(query_rewrite_level + ",").toString();
// 单个字段写入-原始query 纠错词qc 类型-第一个卡片的主标题
// FileWrite.queryTagging("第" + (i + 1) + "个==" + query + " " + query_rewrite_n);
}
// JSONArray下获取所有的JSONObject里的extention,按","拆分打印为一行。StringBuffer可缓存字符串拼接
System.out.println("分词数组为" + tagging分词query);
// 结果写入queryTagging_log.txt文件
FileWrite.queryTagging(query + tagging分词query);
FileWrite.queryTagging("======================");
FileWrite.queryTagging(query + tagging分词score);
3.jsonObject到jsonArray的转换
JSONArray seconddataArray = object.getJSONArray("jsonArray的key");
for (int x = 0; x < seconddataArray.size(); x++)
{
JSONObject seconddata = (JSONObject) seconddataArray.get(x);}
4. JsonArray和JsonObject遍历方法
一:遍历JsonArray
// 一个未转化的字符串
String str = "[{name:'a',value:'aa'},{name:'b',value:'bb'},{name:'c',value:'cc'},{name:'d',value:'dd'}]" ;
// 首先把字符串转成 JSONArray 对象
JSONArray json = JSONArray.fromObject(str );
if(json.size()>0){
for(int i=0;i<json.size();i++){
// 遍历 jsonarray 数组,把每一个对象转成 json 对象
JSONObject job = json.getJSONObject(i);
// 得到 每个对象中的属性值
System.out.println(job.get("name")+"=") ;
}
}
二:遍历JsonObject
JSONObject jsonObject = new JSONObject(s);
//然后用Iterator迭代器遍历取值,建议用反射机制解析到封装好的对象中
JSONObject jsonObject = new JSONObject(jsonString);
Iterator iterator = jsonObject.keys();
while(iterator.hasNext()){
key = (String) iterator.next();
value = jsonObject.getString(key);
}
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FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
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