Java 如何使用超级CSV将列表写入CSV
我相信我可能不得不用supercsv重做我正在做的事情,因为从长远来看可能会更容易,但是我愿意接受任何其他建议。我只是想写回一个csv文件,我有一个包含所有数据的列表,但是输出是这样的Java 如何使用超级CSV将列表写入CSV,java,list,supercsv,Java,List,Supercsv,我相信我可能不得不用supercsv重做我正在做的事情,因为从长远来看可能会更容易,但是我愿意接受任何其他建议。我只是想写回一个csv文件,我有一个包含所有数据的列表,但是输出是这样的 Exception in thread "main" org.supercsv.exception.SuperCsvException: The number of columns to be processed (229326) must match the number of CellProcessors (
Exception in thread "main" org.supercsv.exception.SuperCsvException: The number of columns to be processed (229326) must match the number of CellProcessors (8):
通过替换列表中的字符串,我成功地获得了我想要的输出,但是当它运行时,它会挂起,我相信这是由于我如何回写到csv,我不确定,除了不使用超级csv将其回写到csv之外,还能做些什么。我得到的错误是
4350 02/06/2013 3965.21 0.0 0.0 0.0 0.0 0.0,
4698 02/06/2013 498.16 0.0 0.0 0.0 0.0 0.0,
4992 02/06/2013 97.87 87.82 6.05 0.0 0.0 0.0,
4441 02/06/2013 18.8 71.98 11.6 0.0 0.0 -42.5, 54092 02/06/2013 105.11 118.82 6.24 0.0 0.0 0.0,
我的课程如下
"1805","31/07/2013","-233.4","0.0","0.0","0.0","0.0","0.0"
"8054","31/07/2013","280.45","82.38","52.38","0.0","0.0","-200.0"The number of columns to be processed (1) must match the number of CellProcessors (8):
包编写器;
导入java.io.FileWriter;
导入java.io.IOException;
导入java.util.ArrayList;
导入java.util.array;
导入java.util.List;
导入org.supercsv.cellprocessor.FmtDate;
导入org.supercsv.cellprocessor.ParseDouble;
导入org.supercsv.cellprocessor.ParseInt;
导入org.supercsv.cellprocessor.constraint.NotNull;
导入org.supercsv.cellprocessor.ift.cellprocessor;
导入org.supercsv.io.CsvListWriter;
导入org.supercsv.io.ICsvListWriter;
导入org.supercsv.prefs.CsvPreference;
公共类租赁声明编写器{
公共ArrayList rData;
私有列表csvData;
字符b=',';
public Rent语句编写器(ArrayList rentData){
rData=租金数据;
ICsvListWriter listWriter=null;
试一试{
listWriter=new CsvListWriter(new FileWriter(“rentl.csv”),CsvPreference.STANDARD_首选项);
CellProcessor[]处理器=新的CellProcessor[]{
新的ParseInt(),
新FmtDate(“日/月/年”)//
新的ParseDouble(),
新的ParseDouble(),
新的ParseDouble(),
新的ParseDouble(),
新的ParseDouble(),
新的ParseDouble(),
};
最终字符串[]头=新字符串[]{“\u num”,“End\u Date”,“bal\u val”,“rval”,“cval”,“bf\u val”,“aval”,“pval”};
System.out.print(“to string”+rData.toString().replaceFirst(“,“\”).replaceAll(“,”,“\\,”).replaceAll(“,”).replaceAll(“,“,”).replaceAll(“,”,“,”,“\”,“\”,“\”,“\n\”);
csvData=Arrays.asList(rData.toString().replaceFirst(“,”\”).replaceAll(“,”,“\\,”).replaceAll(“,”).replaceAll(“,”,“,”).replaceAll(“\”,“,”,“\”);
/*
*替换
*.replaceAll(“,”\“\,\”)
*/
listWriter.writeHeader(标题);
写入(csvData、处理器);
}捕获(IOE异常){
//TODO自动生成的捕捉块
e、 printStackTrace();
系统输出打印(e+“文件无法写入”);
}最后{
如果(listWriter!=null){
试一试{
listWriter.close();
}捕获(IOE异常){
e、 printStackTrace();
System.out.println(“列表编写器”);
}
}
}
}
字符串listToCsv(列表ListOfstring,字符分隔符){
StringBuilder sb=新的StringBuilder();
//几乎最后
对于(int i=0;i
我在这个语法中遗漏了什么,或者有没有更好的方法来完成这个任务这个问题的答案就在于这个问题 要处理的列数(1)必须与 手机处理器(8): 实际上,一行中逗号分隔的数据数量比您最初告诉SuperCSV的数量还要多
package writer;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.supercsv.cellprocessor.FmtDate;
import org.supercsv.cellprocessor.ParseDouble;
import org.supercsv.cellprocessor.ParseInt;
import org.supercsv.cellprocessor.constraint.NotNull;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.io.CsvListWriter;
import org.supercsv.io.ICsvListWriter;
import org.supercsv.prefs.CsvPreference;
public class RentStatementsWriter {
public ArrayList rData;
private List<String> csvData;
char b = ',';
public RentStatementsWriter(ArrayList rentData) {
rData = rentData;
ICsvListWriter listWriter = null;
try{
listWriter = new CsvListWriter(new FileWriter("rentl.csv"),CsvPreference.STANDARD_PREFERENCE);
CellProcessor[] processors =new CellProcessor[]{
new ParseInt(),
new FmtDate("dd/MM/yyyy"),//
new ParseDouble(),
new ParseDouble(),
new ParseDouble(),
new ParseDouble(),
new ParseDouble(),
new ParseDouble(),
};
final String [] header = new String []{"_num", "End_Date", "bal_val","rval","cval","bf_val","aval","pval"};
System.out.print("to string "+rData.toString().replaceFirst(" ", "\"").replaceAll("\\,"," \\,").replaceAll(" ", "").replaceAll(" ", "\"\\,\"").replaceAll("\"\\,\"\\,", "\"\n\""));
csvData = Arrays.asList(rData.toString().replaceFirst(" ", "\"").replaceAll("\\,"," \\,").replaceAll(" ", "").replaceAll(" ", "\"\\,\"").replaceAll("\"\\,\"\\,", "\"\""));
/*
* replace
* .replaceAll(" ", "\"\\,\"")
*/
listWriter.writeHeader(header);
listWriter.write(csvData, processors);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.print(e+" file unable to write");
} finally {
if(listWriter !=null){
try {
listWriter.close();
} catch (IOException e) {
e.printStackTrace();
System.out.println("list writer");
}
}
}
}
String listToCsv(List<String> listOfStrings, char separator) {
StringBuilder sb = new StringBuilder();
// all but last
for(int i = 0; i < listOfStrings.size() - 1 ; i++) {
sb.append("\""+listOfStrings.get(i)+"\"");
sb.append(separator);
}
// last string, no separator
sb.append(listOfStrings.get(listOfStrings.size()-1));
return sb.toString();
}
}
这使得SuperCSV假设每行和每列预期只有8个值对应一个标题。若在行中传递更多的值,它不知道该值对应的是什么,所以它会抛出异常
提供如何定义可选/必填列。有几个问题:
ParseInt
和ParseDouble
分别用于将CSV字符串读入Integer
和Double
。请参阅方便的表格,了解哪些单元处理器可用于读/写或两者兼用。如果需要,可以将它们保留为null
,超级CSV只需对每个对象调用toString()
数组中。asList()
-看起来您假设此方法实际上将字符串拆分为一个列表(它不会!)rentData
列表直接传递到listWriter.write()
时会发生什么ParseInt
和ParseDouble
替换为null
),将rentData
列表直接传递给Super CSV
final String [] header = new String []{"_num", "End_Date", "bal_val","rval","cval","bf_val","aval","pval"};
…然后将结果(输出/堆栈跟踪)发布到您的问题 @猎犬虽然你可能是对的,但我自己无法让它按我想要的方式工作。我将列表更改为字符串类型,但仍然得到了[lorg supercsv]的废话,我决定退出超级csv,以防有人遇到这个问题,我发现这样做更容易。除了generate csv方法外,不需要构造函数中的内容
listWriter.write(rentData, processors);
包编写器;
公共类租赁声明编写器{
/*
*
*问题是,超级csv的工作,每个条目将需要一个单独的列表
*/
公共ArrayList rData;
私人名单
package writer;
public class RentStatementsWriter {
/*
*
* problem being that for super csv to work each entry will need a seperate list
*/
public ArrayList<RentStatements> rData;
private List<String> csvData;
char b = ',';
public RentStatementsWriter(ArrayList rentData) {
rData = rentData;
csvData = new ArrayList<String>();
try{
generateCsvFile("renttest.csv", rentData,b);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.print(e+" file unable to write");
} finally {
if(listWriter !=null){
try {
listWriter.close();
} catch (IOException e) {
e.printStackTrace();
System.out.println("list writer");
}
}
}
}
private void generateCsvFile(String fileName, ArrayList rentData, char b2) {
try{
final String [] header = new String []{"tncy_num", "End_Date", "bal_val","rent_val","chg_val","benf_val","adj_val","pay_val"};
FileWriter writer = new FileWriter(fileName);
writer.append("tncy_num");
writer.append(',');
writer.append("End_Date");
writer.append(',');
writer.append("bal_val");
writer.append(',');
writer.append("rent_val");
writer.append(',');
writer.append("chg_val");
writer.append(',');
writer.append("benf_val");
writer.append(',');
writer.append("adj_val");
writer.append(',');
writer.append("pay_val");
writer.append('\n');
for(int i = 0;i <rentData.size();i++){
String line = rentData.get(i).toString();
String bits []=line.split(" ");//splits each space into diffrent bits
//string something = bits.get waleva the it is surround it by ""
writer.append(bits[1]);
writer.append(b2);
writer.append(bits[2]);
writer.append(b2);
writer.append(bits[3]);
writer.append(b2);
writer.append(bits[4]);
writer.append(b2);
writer.append(bits[5]);
writer.append(b2);
writer.append(bits[6]);
writer.append(b2);
writer.append(bits[7]);
writer.append(b2);
writer.append(bits[8]);
writer.append('\n');
}
writer.flush();
writer.close();
}catch(IOException e)
{
e.printStackTrace();
}
// TODO Auto-generated method stub
}