java操作csv文件

这里写一写用java怎么读取excel中csv格式的文件。下面是一个例子。


//JAVA 操作 excel 中的 .csv文件格式
public class CsvUtil {

private String filename = null;
private BufferedReader bufferedreader = null;
private List list =new ArrayList();
public CsvUtil() { }

public CsvUtil(String filename) throws IOException{
this.filename = filename;
bufferedreader = new BufferedReader(new FileReader(filename));
String stemp;
while((stemp = bufferedreader.readLine()) != null){
list.add(stemp);
}
}

public List getList() throws IOException {
return list;
}

//得到csv文件的行数
public int getRowNum(){
return list.size();
}
//得到csv文件的列数
public int getColNum(){
if(!list.toString().equals("[]")) {
if(list.get(0).toString().contains(",")) { //csv文件中，每列之间的是用','来分隔的
return list.get(0).toString().split(",").length;
}else if(list.get(0).toString().trim().length() != 0) {
return 1;
}else{
return 0;
}
}else{
return 0;
}
}

//取得指定行的值

public String getRow(int index) {
if (this.list.size() != 0)
return (String) list.get(index);
else
return null;
}
//取得指定列的值
public String getCol(int index){
if (this.getColNum() == 0){
return null;
}
StringBuffer scol = new StringBuffer();
String temp = null;
int colnum = this.getColNum();
if (colnum > 1){
for (Iterator it = list.iterator(); it.hasNext();) {
temp = it.next().toString();
scol = scol.append(temp.split(",")[index] + ",");
}
}else{
for (Iterator it = list.iterator(); it.hasNext();) {
temp = it.next().toString();
scol = scol.append(temp + ",");
}
}
String str=new String(scol.toString());
str = str.substring(0, str.length() - 1);
return str;
}
//取得指定行，指定列的值
public String getString(int row, int col) {
String temp = null;
int colnum = this.getColNum();
if(colnum > 1){
temp = list.get(row).toString().split(",")[col];
}else if(colnum == 1) {
temp = list.get(row).toString();
}else{
temp = null;
}
return temp;
}

public void CsvClose() throws IOException {
this.bufferedreader.close();
}

public void run(String filename) throws IOException {
CsvUtil cu = new CsvUtil(filename);
for(int i=0;i
String name = cu.getString(i,0);//得到第i行.第一列的数据.
String email = cu.getString(i,1);//得到第i行.第二列的数据.
Strin

g tel = cu.getString(i,2);
String number = cu.getString(i,3);

System.out.println("===name:"+name);
System.out.println("===email:"+email);
System.out.println("===tel:"+tel);
System.out.println("===number:"+number);
System.out.println(" ");
}
cu.CsvClose();
}

public static void main(String[] args) throws IOException {
CsvUtil test = new CsvUtil();
test.run("D:/alpha/abc.csv");
}
}








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public class CsvUtil1 {
private String filename = null;

private BufferedReader bufferedreader = null;

private List list = new ArrayList();

public CsvUtil1() {

}

public CsvUtil1(String filename) throws IOException {
this.filename = filename;
bufferedreader = new BufferedReader(new FileReader(filename));
String stemp;
while ((stemp = bufferedreader.readLine()) != null) {
list.add(stemp);
}
}

public List getList() throws IOException {
return list;
}

public int getRowNum() {
return list.size();
}

public int getColNum() {
if (!list.toString().equals("[]")) {
if (list.get(0).toString().contains(",")) {
return list.get(0).toString().split(",").length;
} else if (list.get(0).toString().trim().length() != 0) {
return 1;
} else {
return 0;
}
} else {
return 0;
}
}

public String getRow(int index) {
if (this.list.size() != 0)
return (String) list.get(index);
else
return null;
}

public String getCol(int index) {
if (this.getColNum() == 0) {
return null;
}
StringBuffer scol = new StringBuffer();
String temp = null;
int colnum = this.getColNum();
if (colnum > 1) {
for (Iterator it = list.iterator(); it.hasNext();) {
temp = it.next().toString();

scol = scol.append(temp.split(",")[index] + ",");
}
} else {
for (Iterator it = list.iterator(); it.hasNext();) {
temp = it.next().toString();
scol = scol.append(temp + ",");
}
}
String str = new String(scol.toString());
str = str.substring(0, str.length() - 1);
return str;
}

public String getString(int row, int col) {
String temp = null;
int colnum = this.getColNum();
if (colnum > 1) {
temp = list.get(row).toString().split(",")[col];
} else if (colnum == 1) {
temp = list.get(row).toString();
} else {
temp = null;
}
return temp;
}

public void CsvClose() throws IOException {
this.bufferedreader.close();
}

public void test() throws IOException {
CsvUtil1 cu = new CsvUtil1("D:/学习/00dw.csv");
List tt = cu.getList();
for (Iterator itt = tt.iterator(); itt.hasNext();) {
System.out.println(itt.next().toString()+"||");
}
// System.out.println(cu.getRowNum());
// System.out.println(cu.getColNum());
// System.out.println(cu.getRow(0));
// System.out.println(cu.getCol(0));
// System.out.println(cu.getString(0, 0));
cu.CsvClose

();

}

public void createCsvTest1(HttpServletResponse Response) throws IOException {
CsvUtil1 cu = new CsvUtil1("D:/学习/00dw.csv");
List tt = cu.getList();
String data = "";


SimpleDateFormat dataFormat = new SimpleDateFormat("yyyyMMddHHmm");
Date today = new Date();
String dateToday = dataFormat.format(today);
File file=new File("D:/学习/001dw.csv");
if(!file.exists())
file.createNewFile();
// else
// file.delete() ;
String str[] ;
StringBuilder sb = new StringBuilder("");
BufferedWriter output=new BufferedWriter(new FileWriter(file,true));
for (Iterator itt = tt.iterator(); itt.hasNext();) {
String fileStr = itt.next().toString() ;
str = fileStr.split(",");
for(int i=0;i<=str.length-1;i++){ //拆分成数组 用于插入数据库中
System.out.print("str["+i+"]="+str[i]+" ");
}
System.out.println("");
sb.append(fileStr+"\r\n") ;
}
//System.out.println(sb.toString());
output.write(sb.toString());
output.flush() ;
output.close();
cu.CsvClose();

}
public static void main(String[] args) throws IOException {
CsvUtil1 test = new CsvUtil1();
//test.test();
HttpServletResponse response = null ;
test.createCsvTest1(response);
}
}