Question

我在ArrayList中有数据行。我需要从List中读取数据并将其转换为另一种格式并写入平面文件。

List Data:
General Details|S|!|!|66T4051|N|MACH|a
Charge Details|S|!|!|66T4051| 3827|N|
Charge Details|S|!|!|66T4051| 3828|N| 
Insurance Details|S|!|!|66T4051|   f|
Insurance Details|S|!|!|66T4051|   h|
Insurance Details|S|!|!|66T4051|   p|

这里GeneralDetails count为1，这是主数据。费用详情计数为2.保险详情计数为3。

我需要将上面的列表数据转换为以下格式的一个字符串。

ROW1|General Details|S|!|!|66T4051|N|MACH|a|2|Charge Details|S|!|!|66T4051| 3827|N|Charge Details|S|!|!|66T4051| 3828|N|3|Insurance Details|S|!|!|66T4051|   f|Insurance Details|S|!|!|66T4051|  h|Insurance Details|S|!|!|66T4051|   p$

我需要在每条记录前放置计数。我们可以说。

ROW1 - 1 is the count of General Details
|2|Charge Details - 2 is the count of Charge Details
|3|Insurance Details - 3 is the count of Insurance Details

请建议如何实现这一目标？

我得到了每一行的计数。

map>{Charge Details=2, General Details=1,Insurance Details=3}

但我之后无法继续。

public void processRows(LinkedList<LinkedList<Object>> linkedList,String intfCode,String bankId)
{
for(int i=0;i<linkedList.size();i++)
{
   List<Object> list =  linkedList.get(i);
   //System.out.println("list>>"+i+""+list);

   List<Object> tableNameList =  new ArrayList<Object>();
   LinkedHashMap map = new LinkedHashMap();

   for(int j=0;j<list.size();j++)
   {
       String rowOfLine = (String)list.get(j);
       String split[] = (rowOfLine.split("\\|"));
       String tableName=split[0];
       tableNameList.add(tableName);
   }
   for(int j=0;j<list.size();j++)
   {
       String rowOfLine = (String)list.get(j);
       String split[] = (rowOfLine.split("\\|"));
       String tableName=split[0];

       int count = Collections.frequency(tableNameList, tableName);
       System.out.println("count>>"+count);
       if(!(map.containsKey(tableName)) && tableName!=null)
       {
       map.put(tableName, count);
       }
       //transformRow(tableName,intfCode,bankId,rowOfLine,collateralType);
   }
       System.out.println("map>"+map);


}
}

Answer 1

遍历所有列表并注意列表的正确排序。每当新的列表类型开始在迭代之前将列表的数量附加到您的String中。

Answer 2

I have rows of data in ArrayList. I need to read the data from List and convert it to another format and write to flat file.

以下是您如何解决问题的想法。请记住，我没有测试过这段代码，我的目的是向您展示如何解决您的问题。假设您的ArrayList数据名为contents ...

Map<String, List<String>> indexedContents = new HashMap<String, List<String>>();
for (String str : contents) {
    String[] splittedString = str.split("\\|");
    if (splittedString.length > 0) {
    //Index your map on the first entry which is something like
    //"Charge Details"
    if(indexedContents.get(splittedString[0]) == null){
        indexedContents.put(splittedString[0], new ArrayList<String>());
    }
    indexedContents.get(splittedString[0]).add(str);
    }
}
StringBuffer output = new StringBuffer();
for(String key : indexedContents.keySet()){
    output.append(indexedContents.get(key).size()).append("|");
    for(String values : indexedContents.get(key)){
    output.append(values).append("|");
    }
}

地图中的条目会跟踪您的尺寸，因为它是List。最后的for循环实际上会创建输出格式，可以根据需要进行更改。我希望这个对你有用。

Answer 3

以下是您要求的代码。

代码：

import java.util.ArrayList;

public class Sample1 {

    public static void main( String[] str ) {
        ArrayList<String> list = new ArrayList<String>();
        list.add( "General Details|S|!|!|66T4051|N|MACH|a" );
        list.add( "Charge Details|S|!|!|66T4051| 3827|N|" );
        list.add( "Charge Details|S|!|!|66T4051| 3828|N|" );
        list.add( "Insurance Details|S|!|!|66T4051|   f|" );
        list.add( "Insurance Details|S|!|!|66T4051|   h|" );
        list.add( "Insurance Details|S|!|!|66T4051|   p|" );

        StringBuffer mainBuf = new StringBuffer();
        StringBuffer tempBuf = new StringBuffer();

        int count = 0;
        String header = null;
        for( String item : list ) {
            String[] values = item.split( "\\|" );

            // if this is first element
            if( header == null ) {
                header = values[0];
                count = 1;
            }
            // check if the previous element and present element is not same.
            else if(!header.equals(values[0])) {
                append( count, header, mainBuf, tempBuf.toString() );
                tempBuf.delete( 0, tempBuf.length() );
                count = 1;
                header = values[0];
            } else {
                count++;
            }
            if( tempBuf.length() > 0 && tempBuf.charAt( tempBuf.length() - 1 ) != '|' ) {
                tempBuf.append( "|" );
            }
            tempBuf.append( item );
        }
        append( count, header, mainBuf, tempBuf.toString() );

        // replace last character as $ 
        int lastIndex = mainBuf.length();
        mainBuf.replace( lastIndex - 1, lastIndex, "$" );
        System.out.println(" mainBuf => " + mainBuf );
    }

    public static void append( int count, String header, StringBuffer mainBuf, String str ) {
        if( header.equalsIgnoreCase(  "General Details" ) ) {
            mainBuf.append( "ROW" + count + "|" ).append( str );
        } else {
            if( mainBuf.charAt( mainBuf.length() - 1 ) != '|' ) {
                mainBuf.append( "|" );
            }
            mainBuf.append( count + "|" ).append( str );
        }
    }
}

从列表中读取数据并创建字符串以写入平面文件

3 个答案: