解析CSV文件时遇到问题。它只有两行数据，用逗号分隔它们。第一行是日期，第二行是值。日期字段将始终包含日期，但有时值为空（或为空？）。当它到达null值时，我得到一个StringIndexOutOfBoundsException并且应用程序崩溃。我正在记录每个循环并且可以看到数据，但是一旦我得到一个空值，它就会停止循环并给出错误。如果没有空值，那么它就完美了。这是我的代码：
BufferedReader buf = new BufferedReader(new StringReader(file));
String line = null;
while ((line = buf.readLine()) != null) {
try {
String date = null, value = null;
String[] RowData = line.split(",");
date = RowData[0];
value = RowData[1]; (this is the row it crashes on)
这就是CSV的样子：
2011-08-28 09：16,8.23
2011-08-28 09：15,8.24
2011-08-28 09：14,8.26
2011-08-28 09：13,8.34
2011-08-28 09：12，
2011-08-28 09：11,10.72
2011-08-28 09:10，
2011-08-28 09:09，
在我收到错误之前，09:13的值是logcat中的最后一件事。
这解决了它：
if(RowData.length == 2) {
date = RowData[0];
value = RowData[1];
} else {
date = RowData[0];
value = "0";
}
我在值字段中写了一个0，因此以后的进程不会阻塞空值。谢谢你们的帮助！
答案 0 :(得分：2)
您想要这样做或类似的事情：
String date = null, value = null;
String[] RowData = line.split(",");
date = RowData[0];
if(RowData.length ==2)value = RowData[1]; (this is the row it crashes on)
或者它的一些变化，例如if（RowData.length＆lt; 2）不要尝试读取该值。它是一个非常标准的东西 - 如果你向一个数组索取一个值的索引它没有Java会崩溃。
答案 1 :(得分：2)
为什么要编写自己的CSV解析，当你可以使用已经编写过的库来执行此操作时？也许OpenCSV可以帮助您实现CSV解析目标。
答案 2 :(得分：1)
在尝试访问RowData之前检查它的长度。看起来split（）返回一个带有单个对象的数组，但是你试图访问第二个对象，这确实是超出范围的。
答案 3 :(得分：1)
public class CityParser {
DocumentBuilderFactory factory;
DocumentBuilder builder;
Document doc;
Element ele;
int mediaThumbnailCount;`enter code here`
boolean urlflag;
CityListBean objBean = null;
Vector<CityListBean> vecCityList;
public CityParser() {
}
public Vector<CityListBean> getCityData() {
vecCityList = new Vector<CityListBean>();
try {
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpGet httpGet = new HttpGet(
"http://heresmyparty.com/cms/index.php?option=com_chronocontact&chronoformname=add_event_form_download");
HttpResponse response = httpClient.execute(httpGet, localContext);
// String result = "";
BufferedReader reader = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
CSVReader csvreader = new CSVReader(reader);
String[] nextLine;
while ((nextLine = csvreader.readNext()) != null) {
CityListBean objcitylist = new CityListBean();
// nextLine[] is an array of values from the line
objcitylist.setText_title(nextLine[5]);
objcitylist.setText_host(nextLine[6]);
objcitylist.setText_price(nextLine[7]);
objcitylist.setDate(nextLine[8]);
objcitylist.setText_venue(nextLine[11]);
objcitylist.setAddress(nextLine[12]);
objcitylist.setLatitude(nextLine[13]);
objcitylist.setLongitude(nextLine[14]);
objcitylist.setFile(nextLine[15]);
objcitylist.setText_description(nextLine[16]);
objcitylist.setCity(nextLine[17]);
vecCityList.addElement(objcitylist);
}
/*for (int i = 0; i < vecCityList.size(); i++) { CityListBean
objcity = (CityListBean) vecCityList.get(i);
System.out.println("Cf_id : " + objcity.getCityName());
System.out.println("-----------------------------------"); }*/
} catch (Exception ex) {
ex.printStackTrace();
}
return vecCityList;
}
}
==========================================================================================
public class CSVReader {
private BufferedReader br;
private boolean hasNext = true;
private char separator;
private char quotechar;
private int skipLines;
private boolean linesSkiped;
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;
}
private 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;
}
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();
if (nextLine == null)
break;
}
for (int i = 0; i < nextLine.length(); i++) {
char c = nextLine.charAt(i);
if (c == quotechar) {
// this gets complex... the quote may end a quoted block, or escape another quote.
// do a 1-char lookahead:
if( inQuotes // we are in quotes, therefore there can be escaped quotes in here.
&& nextLine.length() > (i+1) // there is indeed another character to check.
&& nextLine.charAt(i+1) == quotechar ){ // ..and that char. is a quote also.
// we have two quote chars in a row == one quote char, so consume them both and
// put one on the token. we do *not* exit the quoted text.
sb.append(nextLine.charAt(i+1));
i++;
}else{
inQuotes = !inQuotes;
// the tricky case of an embedded quote in the middle: a,bc"d"ef,g
if(i>2 //not on the begining of the line
&& nextLine.charAt(i-1) != this.separator //not at the begining of an escape sequence
&& nextLine.length()>(i+1) &&
nextLine.charAt(i+1) != this.separator //not at the end of an escape sequence
){
sb.append(c);
}
}
} else if (c == separator && !inQuotes) {
tokensOnThisLine.add(sb.toString());
sb = new StringBuffer(); // start work on next token
} else {
sb.append(c);
}
}
} while (inQuotes);
tokensOnThisLine.add(sb.toString());
return (String[]) tokensOnThisLine.toArray(new String[0]);
}
public void close() throws IOException{
br.close();
}
}
答案 4 :(得分：0)
您是否尝试过先检查
if (RowData[1]!=null) or possibly if (RowData[1]!="")
我不明白为什么会导致你的应用崩溃，
它应该将值设置为null或""