距离有个BufferWriter writer对象要写一个csv文件。
writer.wrtie("第一列")；
writer.write(",")
writer.write("第二列")
这就是一个简单的用,分割的csv文件。
package cn.com.sunjapan.university.webimport java.util.ArrayList
import java.util.Vector
import org.apache.commons.logging.Log
import org.apache.commons.logging.LogFactory
import cn.com.sunjapan.comlib.exception.PJException
import cn.com.sunjapan.framework.core.misc.ChainedException
public class ParseCsvUtil {
transient private static Log log = LogFactory.getLog(ParseCsvUtil.class)
/** 屏蔽构造函数 */
private ParseCsvUtil() {
}
/** 单子模式静态变量 */
private static ParseCsvUtil instance
/**
* 获取静态方法
*
* @return 静态变量
*/
public static synchronized ParseCsvUtil getInstance() {
if (instance == null) {
instance = new ParseCsvUtil()
}
return instance
}
/**
* 得到文件头的数据<br>
*
* @param csvdata
* 头文件信息
* @return 头文件信息
*/
public ArrayList<String> parseCsvHeadData(String[][] csvdata) {
if (log.isDebugEnabled()) {
log.debug("now we enter parseCsvHeadData of ParseCsvFileManager")
}
ArrayList<String> csvHeadList = new ArrayList<String>()
for (int i = 0 i < csvdata[0].length i++) {
csvHeadList.add(csvdata[0][i])
}
return csvHeadList
}
/**
* 得到文件内容的list<br>
*
* @param csvdata
* 文件内容
* @return 文件内容
*/
public ArrayList<String[]> parseCsvData(String[][] csvdata) {
if (log.isDebugEnabled()) {
log.debug("now we enter parseCsvData of ParseCsvFileManager")
}
ArrayList<String[]> csvList = new ArrayList<String[]>()
for (int i = 1 i < csvdata.length i++) {
csvList.add(csvdata[i])
}
return csvList
}
/**
* 解析csv文件一行数据
*
* @param csvLine
* csv文件的一行数据
* @return 解析后的字符串数组
* @throws ChainedException
* 抛出异常
*/
public static String[] parseCsvLine(String csvLine) throws ChainedException {
if (log.isDebugEnabled()) {
log.debug("now we enter parseCsvLine of CSVFileParse")
}
String[] retArray = null
if (csvLine == null || csvLine.trim().length() <= 0) {
return null
}
StringBuffer sbuf = new StringBuffer()
Vector<String> result = new Vector<String>()
boolean beginWithQuote = false
int length = csvLine.length()
for (int i = 0 i < length i++) {
char ch = csvLine.charAt(i)
if (ch == '\"') {
if (beginWithQuote) {
i++
if (i >= length) {
result.addElement(sbuf.toString())
sbuf = new StringBuffer()
beginWithQuote = false
} else {
ch = csvLine.charAt(i)
if (ch == '\"') {
sbuf.append(ch)
} else if (ch == ',') {
result.addElement(sbuf.toString())
sbuf = new StringBuffer()
beginWithQuote = false
} else {
throw new ChainedException(
"Single double-quote char mustn't exist in filed "
+ (result.size() + 1)
+ " while it is begined with quote\nchar at:"
+ i)
}
}
} else if (sbuf.length() == 0) {
beginWithQuote = true
} else {
throw new ChainedException(
"Quote cannot exist in a filed which doesn't begin with quote!\nfield:"
+ (result.size() + 1))
}
} else if (ch == ',') {
if (beginWithQuote) {
sbuf.append(ch)
} else {
result.addElement(sbuf.toString())
sbuf = new StringBuffer()
beginWithQuote = false
}
} else {
sbuf.append(ch)
}
}
if (sbuf.length() != 0) {
if (beginWithQuote) {
throw new ChainedException(
"last field is begin with but not end with double quote")
} else {
result.addElement(sbuf.toString())
}
}
retArray = new String[result.size()]
for (int i = 0 i < retArray.length i++) {
retArray[i] = (String) result.elementAt(i)
}
return retArray
}
/**
* 导出文件<br>
*
* @param request
* HttpServletRequest
* @return 导出文件
* @throws ChainedException
* ChainedException
*/
public ArrayList<String[]> outFileList(String[][] content)
throws ChainedException {
if (log.isDebugEnabled()) {
log.debug("now we enter outFileList of ParseCsvFileManager")
}
ArrayList<String[]> list = new ArrayList<String[]> ()
try {
if (content.length > 0) {
for (int i = 0 i < content.length i++) {
String lineValue = ""
for(int x = 0 x < content[i].length x++){
if(x == content[i].length - 1){
lineValue += content[i][x]
}else {
lineValue += content[i][x] + ","
}
}
// 解析字符串把null替换成空的
String[] valueList = parseCsvLine(lineValue
.replaceAll("null", "")
+ ",")
list.add(valueList)
}
}
} catch (PJException e) {
// TODO 自动生成 catch 块
e.printStackTrace()
}
return list
}
}
