CSV文件按顺序变为变量。我一直在尝试读取一个CSV文件,其中包含两列,一个标题,然后是一个条目列表。
目前我一直在使用LinkedHashMap;使用以下循环来读取,拆分和创建LinkedHashMap。
但它目前卡在我的CSV的第5行。这是当前的读取循环:
public static LinkedHashMap<String, ArrayList<String>> runningOrderMap(String filename) throws IOException {
LinkedHashMap<String, ArrayList<String>> linkedHashMap = new LinkedHashMap<>(50);
String currentLine = ""; //init iterator variable
String[] valuesTMP;
try {
bufferedReader = new BufferedReader(new FileReader(filename));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while((currentLine = bufferedReader.readLine()) != null){
valuesTMP = currentLine.split(", ");
ArrayList<String> values = new ArrayList<>();
String key = valuesTMP[0].split("\t")[0].trim();
values.add(valuesTMP[0].split("\t")[1].trim());
for(int i = 1; i < valuesTMP.length; i++){
values.add(valuesTMP[i]);
System.out.println(valuesTMP[i]);
linkedHashMap.put(key, values);
}
}
System.out.println("linked hashmap:"+linkedHashMap.keySet().size());
return linkedHashMap;
}
示例数据的格式如下,标题长度不同,标签,然后是内容条目列表,如下所示:
title content, content2
title example content, content2, content3
title example three content, content2
title example content, content2
这个数据大约持续20行,但LinkedHashMap不会超过第5行:
title example two content
我需要保留数组中的行顺序。
好像我知道出了什么问题)
尝试将linkedHashMap.put(key, values);
线移出内部for
循环,如下所示:
public static LinkedHashMap<String, ArrayList<String>> runningOrderMap(String filename) throws IOException {
LinkedHashMap<String, ArrayList<String>> linkedHashMap = new LinkedHashMap<>(50);
String currentLine = ""; //init iterator variable
String[] valuesTMP;
try {
bufferedReader = new BufferedReader(new FileReader(filename));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while((currentLine = bufferedReader.readLine()) != null){
valuesTMP = currentLine.split(", ");
ArrayList<String> values = new ArrayList<>();
String key = valuesTMP[0].split("\t")[0].trim();
values.add(valuesTMP[0].split("\t")[1].trim());
for(int i = 1; i < valuesTMP.length; i++){
values.add(valuesTMP[i]);
System.out.println(valuesTMP[i]);
}
linkedHashMap.put(key, values); // <--this line was moved out from internal for loop
}
System.out.println("linked hashmap:"+linkedHashMap.keySet().size());
return linkedHashMap;
}
因为,您看,只有当内容有多个部分时,才会执行此内部for
循环