之前没有这样做过。寻找一点方向和帮助。谢谢大家。
我需要获取一个csv数据文件并将其转换为特定格式的json文件。我现在正在阅读JsonObject和JsonArray，...谢谢！
我有类似的东西。
timestamp,NST_MD3_CRANK_CASE,NST_MD3-TAH-0001,NST_MD3-TAH-0002,NST_MD3-TAH-0003,NST_MD3-TAH-0004,NST_MD3-TAH-0005,NST_MD3-TAH-0006,NST_MD3-TAH-0007,NST_MD3-TAH-0008,NST_MD3-TAH-0009,NST_MD3-TAH-0010,NST_MD3-TAH-0011,NST...
4/10/2018 7:55:10 PM,101,261,258,276,267,274,279,273,286,273,276,288,292,268,297,285,316,81,136,100,0,0,388,395,84,956,20,1,0,100,0,17,0,31,16,31,18,23,694.7667,59.98439,0,0,0,1,14998,13,24
4/10/2018 7:58:10 PM,101,261,258,276,267,274,279,273,286,273,276,288,292,268,297,285,316,81,136,100,0,0,388,395,84,956,20,1,0,100,0,17,0,31,16,31,18,23,694.9326,59.92459,0,0,0,1,14998,13,24
我需要像这样的Json格式......
{ "tags": [ {"tagId": "NST_MD1_CRANK_CASE","data":[ {"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}] }, ... ] }
我使用的是camel，java和jackson。再次感谢！
答案 0 :(得分：0)
这是使用org.json：如果你需要添加更多数据，只需向JSONArray添加更多对象（data2，data3 ...）。使用JsonArrays时要小心括号！
预期产出：
{
"tags": [{
"data": [{
"q": "3",
"v": "100",
"ts": "2017-11-15T19:55:00"
}],
"tagId": "NST_MD1_CRANK_CASE"
}]
}
这是代码：
package test;
import org.json.JSONArray;
import org.json.JSONObject;
public class jsonExample {
public static void main(String[] args) {
//create our data
String tagId = "NST_MD1_CRANK_CASE";
JSONObject data1 = new JSONObject();
data1.put("ts", "2017-11-15T19:55:00");
data1.put("v", "100");
data1.put("q", "3");
//create dataArray -> JSONArray
/*
[{ "ts": "2017-11-15T19:55:00",
"v": "100",
"q": "3" }]
*/
JSONArray dataArray = new JSONArray();
dataArray.put(data1);
//create internal JSON Object
/*
{
"tagId": "NST_MD1_CRANK_CASE",
"data": [{
"ts": "2017-11-15T19:55:00",
"v": "100",
"q": "3"
}]
}
*/
JSONObject internal = new JSONObject();
internal.put("tagId", tagId);
internal.put("data", dataArray);
//create tags -> JSON Array
/*
[{
"tagId": "NST_MD1_CRANK_CASE",
"data": [{
"ts": "2017-11-15T19:55:00",
"v": "100",
"q": "3"
}]
}]
*/
JSONArray tags = new JSONArray();
tags.put(internal);
//create final JSON Object
/*
{
"tags": [{
"tagId": "NST_MD1_CRANK_CASE",
"data": [{
"ts": "2017-11-15T19:55:00",
"v": "100",
"q": "3"
}]
}]
}
*/
JSONObject finalJson = new JSONObject();
finalJson.put("tags", tags);
System.out.println(finalJson.toString());
}
}
答案 1 :(得分：0)
使用杰克逊库，我想出了如何使用JsonFactory和JsonGenerator以逐步方式实现它。谢谢大家。
代码：
public class JsonMapper implements Processor {
private int noOfRows = 0; //does not include the header record
private int noOfColumns = 0; //includes timestamp field
private static Logger log = LoggerFactory.getLogger(JsonMapper.class.getName());
@Override
public void process(Exchange exchange) throws Exception {
log.info("Entering Json Mapper Processor...");
String body = exchange.getIn().getBody(String.class);
List<String> serviceRecords = new ArrayList<String>(Arrays.asList(body.split(System.lineSeparator())));
noOfRows = serviceRecords.size() - 1;
noOfColumns = getColumns(serviceRecords);
StringBuilder header = getHeader( serviceRecords );
serviceRecords.remove(0); //remove header record only data records in list
String hdr[] = header.toString().split(",");
//Noble_nst_mud-pump-2_NST_MUDPIT1_VOL,Noble_nst_mud-pump-2_NST_MUDPIT2_VOL,Noble_nst_mud-pump-2_NST_MUDPIT3_VOL,Noble_nst_mud-pump-2_NST_MUDPIT4_VOL,Noble_nst_mud-pump-2_NST_MUDPIT5_VOL,Noble_nst_mud-pump-2_NST_MUDPIT6_VOL,Noble_nst_mud-pump-2_NST_MUDPIT7_VOL,Noble_nst_mud-pump-2_NST_MUDPIT8_VOL,Noble_nst_mud-pump-2_NST_R_MUDPIT1_VOL,Noble_nst_mud-pump-2_NST_R_MUDPIT2_VOL,Noble_nst_mud-pump-2_NST_R_MUDPIT3_VOL,Noble_nst_mud-pump-2_NST_R_MUDPIT4_VOL,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_001,Noble_nst_mud-pump-2_NST_MP2_AI_021,Noble_nst_mud-pump-2_NST_MP2_AI_023,Noble_nst_mud-pump-2_NST_MP2_AI_022,Noble_nst_mud-pump-2_NST_MP2_AI_004,Noble_nst_mud-pump-2_NST_MP2_AI_005,Noble_nst_mud-pump-2_NST_MP2_AI_006,Noble_nst_mud-pump-2_NST_MP2_AI_031,Noble_nst_mud-pump-2_NST_MP2_AI_033,Noble_nst_mud-pump-2_NST_MP2_AI_032,Noble_nst_mud-pump-2_NST_MP2_AI_011,Noble_nst_mud-pump-2_NST_MP2_AI_012,Noble_nst_mud-pump-2_NST_MP2_AI_013,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_010,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_004,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_005,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_006,Noble_nst_mud-pump-2_NST_MP2_MOT_RUN_009
//04/10/2018 07:55:10 PM, 1, 0, 2, 0, 81, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 289.4146, 288.65, 288.65, 0, 0, 0, 288.9146, 291.15, 289.2283, 0, 0, 0, 0, 0
//String [] record = serviceRecords.toArray(new String[serviceRecords.size()]);
JsonFactory factory = new JsonFactory();
StringWriter sw = new StringWriter();
JsonGenerator generator = factory.createGenerator(sw);
generator.setPrettyPrinter(new DefaultPrettyPrinter());
generator.writeStartObject(); // {
generator.writeFieldName("tags"); // {"tags":
generator.writeStartArray(); // {"tags": [
for ( String rec : serviceRecords ) {
String[] data = rec.split(",");
for ( int i = 0; i < (noOfColumns - 1); ++i ) { //header has 1 less field than data record
generator.writeStartObject(); // {
generator.writeStringField("tagId", hdr[i].trim()); // { "tagId": "NST_MD1_CRANK_CASE"
generator.writeFieldName("data"); // { "tagId": "NST_MD1_CRANK_CASE", "data"
generator.writeStartArray(); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [
generator.writeStartObject(); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{
generator.writeStringField("ts", data[0].trim()); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00"
generator.writeStringField("v", data[i+1].trim()); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100"
generator.writeStringField("q", "3"); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"
generator.writeEndObject(); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}
generator.writeEndArray(); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}]
generator.writeEndObject(); // { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}]}
}
}
generator.writeEndArray(); // {"tags": [ { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}]} ]
generator.writeEndObject(); // {"tags": [ { "tagId": "NST_MD1_CRANK_CASE", "data" : [{"ts":"2017-11-15T19:55:00","v" : "100","q":"3"}]} ]}
generator.flush();
generator.close();
log.info("JSON: " + sw.toString());
exchange.getIn().setBody(sw.toString());
sw.close();
log.info("Leaving Json Mapper Processor...");
}
public StringBuilder getHeader(List<String> serviceRecords) {
StringBuilder sb = new StringBuilder();
for ( int i = 0; i < 1; i++ ) {
log.debug( "count: " + i + " record: : " + serviceRecords.get(i).toString() );
if ( i == 0 ) {
String[] sa = serviceRecords.get(i).toString().split(",");
for ( int j = 0; j < sa.length; ++j) {
if ( j != 0 ) {
sb.append(sa[j]).append(",");
}
}
sb.deleteCharAt(sb.lastIndexOf(",", sb.length()));
} else {
break;
}
}
return sb;
}
public int getColumns(List<String> serviceRecords) {
int columns = 0;
for ( int i = 0; i < 1; i++ ) {
log.debug( "count: " + i + " record: : " + serviceRecords.get(i).toString() );
if ( i == 0 ) {
String[] sa = serviceRecords.get(i).toString().split(",");
columns = sa.length;
} else {
break;
}
}
return columns;
}
}