Java CSVReader 和 InputStream
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CSVReader and InputStream
提问by fish40
I have created CSVReader and I am trying to read csv file from assets for that reason I should use InputStream. But my code below does not have inputstream constructor. Could anyone tell me how i could add or change something in code, so I can use inputstream.
我已经创建了 CSVReader 并且我正在尝试从资产中读取 csv 文件，因此我应该使用 InputStream。但是我下面的代码没有输入流构造函数。谁能告诉我如何在代码中添加或更改某些内容，以便我可以使用 inputstream。
public class CSVReader {
private BufferedReader br;
private boolean hasNext = true;
private char separator;
private char quotechar;
private int skipLines;
private boolean linesSkiped;
public int linesCount = 0;
public static final char DEFAULT_SEPARATOR = '|';
public static final char DEFAULT_QUOTE_CHARACTER = '"';
public static final int DEFAULT_SKIP_LINES = 0;
public CSVReader(Reader reader) {
this(reader, DEFAULT_SEPARATOR, DEFAULT_QUOTE_CHARACTER,
DEFAULT_SKIP_LINES);
}
public CSVReader(Reader reader, char separator, char quotechar, int line) {
this.br = new BufferedReader(reader);
this.separator = separator;
this.quotechar = quotechar;
this.skipLines = line;
}
public String[] readNext() throws IOException {
String nextLine = getNextLine();
return hasNext ? parseLine(nextLine) : null;
}
public String getNextLine() throws IOException {
if (!this.linesSkiped) {
for (int i = 0; i < skipLines; i++) {
br.readLine();
}
this.linesSkiped = true;
}
String nextLine = br.readLine();
if (nextLine == null) {
hasNext = false;
}
return hasNext ? nextLine : null;
}
public List<String[]> readAll() throws IOException {
List<String[]> allElements = new ArrayList<String[]>();
while (hasNext) {
String[] nextLineAsTokens = readNext();
if (nextLineAsTokens != null)
allElements.add(nextLineAsTokens);
}
return allElements;
}
private String[] parseLine(String nextLine) throws IOException {
if (nextLine == null) {
return null;
}
List<String> tokensOnThisLine = new ArrayList<String>();
StringBuffer sb = new StringBuffer();
boolean inQuotes = false;
do {
if (inQuotes) {
// continuing a quoted section, reappend newline
sb.append("\n");
nextLine = getNextLine();
linesCount++;
if (nextLine == null)
break;
}
for (int i = 0; i < nextLine.length(); i++) {
char c = nextLine.charAt(i);
if (c == quotechar) {
if( inQuotes
&& nextLine.length() > (i+1)
&& nextLine.charAt(i+1) == quotechar ){
sb.append(nextLine.charAt(i+1));
i++;
}else{
inQuotes = !inQuotes;
if(i>2
&& nextLine.charAt(i-1) != this.separator
&& nextLine.length()>(i+1) &&
nextLine.charAt(i+1) != this.separator
){
sb.append(c);
}
}
} else if (c == separator && !inQuotes) {
tokensOnThisLine.add(sb.toString());
sb = new StringBuffer();
} else {
sb.append(c);
}
}
} while (inQuotes);
tokensOnThisLine.add(sb.toString());
return (String[]) tokensOnThisLine.toArray(new String[0]);
}
public void close() throws IOException{
br.close();
}
}
采纳答案by oers
You can construct an InputStreamReaderfrom that InputStream
您可以构造一个InputStreamReader的从InputStream中
new InputStreamReader(myInputStream, encoding)
Where myInputStreamis your InputStreamand encodingis a Stringthat defines the encoding used by your datasource.
哪里myInputStream是你的InputStream，并encoding是一个String定义你的数据源使用的编码。
You can call your CSVReader like this:
您可以像这样调用您的 CSVReader：
new CSVReader(new InputStreamReader(myInputStream, encoding));
