我的要求是从csv文件中读取并使用单个字段写入每列中的excel文件。我成功地从CSV文件中读取。但是从List数组读取并写入excel文件时出错。我附加了代码片段，突出显示错误。让我知道这个问题，如果可能的话，请发送修复程序和任何相同功能的示例代码。
更新的代码包testmaven.testmv;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeMap;
import javax.swing.text.html.HTMLDocument.Iterator;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.apache.poi.hpsf.HPSFException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class CSVReader {
private static class Country {
private String ip_address;
private String full_ip_address;
private String resource_name;
private String serial_number;
private String status;
private String inactive;
private String organistation;
private String system_name;
private String system_org;
private String system_bus_crtcl;
private String vlan_name;
private String vlan_desc ;
private String vlan_contact;
private String class_1;
private String family;
private String assignee_zid;
private String contact_applied;
private String assignee_type;
private String assignee_email_address;
private String assignee_org_name;
private String assignee_full_name;
public Country(String ip_address, String full_ip_address, String resource_name,String serial_number, String status,String inactive,String organistation,String system_name,String system_org,String system_bus_crtcl,String vlan_name,String vlan_desc, String vlan_contact,String class_1,String family,String assignee_zid, String contact_applied,String assignee_type,String assignee_email_address,String assignee_org_name,String assignee_full_name) {
this.ip_address = ip_address;
this.full_ip_address = full_ip_address;
this.resource_name = resource_name;
this.serial_number = serial_number;
this.status = status;
this.inactive = inactive;
this.organistation = organistation;
this.system_name = system_name;
this.system_org = system_org;
this.system_bus_crtcl = system_bus_crtcl;
this.vlan_name = vlan_name;
this.vlan_desc = vlan_desc;
this.vlan_contact = vlan_contact;
this.class_1 = class_1 ;
this.family = family;
this.assignee_zid = assignee_zid;
this.contact_applied = contact_applied;
this.assignee_type = assignee_type;
this.assignee_email_address = assignee_email_address;
this.assignee_org_name = assignee_org_name;
this.assignee_full_name = assignee_full_name;
}
/**
* @return the ip_address
*/
public String getIp_address() {
return ip_address;
}
/**
* @param ip_address the ip_address to set
*/
public void setIp_address(String ip_address) {
this.ip_address = ip_address;
}
/**
* @return the full_ip_address
*/
public String getFull_ip_address() {
return full_ip_address;
}
/**
* @param full_ip_address the full_ip_address to set
*/
public void setFull_ip_address(String full_ip_address) {
this.full_ip_address = full_ip_address;
}
/**
* @return the resource_name
*/
public String getResource_name() {
return resource_name;
}
/**
* @param resource_name the resource_name to set
*/
public void setResource_name(String resource_name) {
this.resource_name = resource_name;
}
/**
* @return the serial_number
*/
public String getSerial_number() {
return serial_number;
}
/**
* @param serial_number the serial_number to set
*/
public void setSerial_number(String serial_number) {
this.serial_number = serial_number;
}
/**
* @return the status
*/
public String getStatus() {
return status;
}
/**
* @param status the status to set
*/
public void setStatus(String status) {
this.status = status;
}
/**
* @return the inactive
*/
public String getInactive() {
return inactive;
}
/**
* @param inactive the inactive to set
*/
public void setInactive(String inactive) {
this.inactive = inactive;
}
/**
* @return the organistation
*/
public String getOrganistation() {
return organistation;
}
/**
* @param organistation the organistation to set
*/
public void setOrganistation(String organistation) {
this.organistation = organistation;
}
/**
* @return the system_name
*/
public String getSystem_name() {
return system_name;
}
/**
* @param system_name the system_name to set
*/
public void setSystem_name(String system_name) {
this.system_name = system_name;
}
/**
* @return the system_org
*/
public String getSystem_org() {
return system_org;
}
/**
* @param system_org the system_org to set
*/
public void setSystem_org(String system_org) {
this.system_org = system_org;
}
/**
* @return the system_bus_crtcl
*/
public String getSystem_bus_crtcl() {
return system_bus_crtcl;
}
/**
* @param system_bus_crtcl the system_bus_crtcl to set
*/
public void setSystem_bus_crtcl(String system_bus_crtcl) {
this.system_bus_crtcl = system_bus_crtcl;
}
/**
* @return the vlan_name
*/
public String getVlan_name() {
return vlan_name;
}
/**
* @param vlan_name the vlan_name to set
*/
public void setVlan_name(String vlan_name) {
this.vlan_name = vlan_name;
}
/**
* @return the vlan_desc
*/
public String getVlan_desc() {
return vlan_desc;
}
/**
* @param vlan_desc the vlan_desc to set
*/
public void setVlan_desc(String vlan_desc) {
this.vlan_desc = vlan_desc;
}
/**
* @return the vlan_contact
*/
public String getVlan_contact() {
return vlan_contact;
}
/**
* @param vlan_contact the vlan_contact to set
*/
public void setVlan_contact(String vlan_contact) {
this.vlan_contact = vlan_contact;
}
/**
* @return the class_1
*/
public String getClass_1() {
return class_1;
}
/**
* @param class_1 the class_1 to set
*/
public void setClass_1(String class_1) {
this.class_1 = class_1;
}
/**
* @return the family
*/
public String getFamily() {
return family;
}
/**
* @param family the family to set
*/
public void setFamily(String family) {
this.family = family;
}
/**
* @return the assignee_zid
*/
public String getAssignee_zid() {
return assignee_zid;
}
/**
* @param assignee_zid the assignee_zid to set
*/
public void setAssignee_zid(String assignee_zid) {
this.assignee_zid = assignee_zid;
}
/**
* @return the contact_applied
*/
public String getContact_applied() {
return contact_applied;
}
/**
* @param contact_applied the contact_applied to set
*/
public void setContact_applied(String contact_applied) {
this.contact_applied = contact_applied;
}
/**
* @return the assignee_type
*/
public String getAssignee_type() {
return assignee_type;
}
/**
* @param assignee_type the assignee_type to set
*/
public void setAssignee_type(String assignee_type) {
this.assignee_type = assignee_type;
}
/**
* @return the assignee_email_address
*/
public String getAssignee_email_address() {
return assignee_email_address;
}
/**
* @param assignee_email_address the assignee_email_address to set
*/
public void setAssignee_email_address(String assignee_email_address) {
this.assignee_email_address = assignee_email_address;
}
/**
* @return the assignee_org_name
*/
public String getAssignee_org_name() {
return assignee_org_name;
}
/**
* @param assignee_org_name the assignee_org_name to set
*/
public void setAssignee_org_name(String assignee_org_name) {
this.assignee_org_name = assignee_org_name;
}
/**
* @return the assignee_full_name
*/
public String getAssignee_full_name() {
return assignee_full_name;
}
/**
* @param assignee_full_name the assignee_full_name to set
*/
public void setAssignee_full_name(String assignee_full_name) {
this.assignee_full_name = assignee_full_name;
}
@Override
public String toString() { // return "Country [name=" + name +
// ", capital=" + capital + ", currency=" +
// currency + "]";
return this.ip_address + this.full_ip_address + this.resource_name + this.serial_number;
}
}
public static <E> void main(String args[]) throws FileNotFoundException,
IOException {
System.out
.println("Reading from CSV file using BufferedReader and String Split");
// List nation11 = readCSV();
ArrayList<Country> nation11 = (ArrayList<CSVReader.Country>) readCSV();
//System.out.println(nation11);
int rowCount = 0;
String excelFilePath = "D://abc.xls";
Workbook workbook = new HSSFWorkbook();
Sheet sheet = workbook.createSheet();
Row row = sheet.createRow(++rowCount);
// writeBook(aBook, row);
Cell cell = row.createCell(0);
cell.setCellValue("ip_address");
cell = row.createCell(1);
cell.setCellValue("full_ip_address");
cell = row.createCell(2);
cell.setCellValue("resource_name");
cell = row.createCell(3);
cell.setCellValue("serial_number");
cell = row.createCell(4);
cell.setCellValue("status");
cell = row.createCell(5);
cell.setCellValue("inactive");
cell = row.createCell(6);
cell.setCellValue("organistation");
cell = row.createCell(7);
cell.setCellValue("system_name");
cell = row.createCell(8);
cell.setCellValue("system_org");
cell = row.createCell(9);
cell.setCellValue("system_bus_crtcl");
cell = row.createCell(10);
cell.setCellValue("vlan_name");
cell = row.createCell(11);
cell.setCellValue("vlan_desc");
cell = row.createCell(12);
cell.setCellValue("vlan_contact");
cell = row.createCell(13);
cell.setCellValue("class_1");
cell = row.createCell(14);
cell.setCellValue("family");
cell = row.createCell(15);
cell.setCellValue("assignee_zid ");
cell = row.createCell(16);
cell.setCellValue("contact_applied");
cell = row.createCell(17);
cell.setCellValue("assignee_type");
cell = row.createCell(18);
cell.setCellValue("assignee_email_address");
cell = row.createCell(19);
cell.setCellValue("assignee_org_name");
cell = row.createCell(20);
cell.setCellValue("assignee_full_name");
for (Country country : nation11) {
row = sheet.createRow(++rowCount);
// writeBook(aBook, row);
cell = row.createCell(0);
cell.setCellValue(country.ip_address);
cell = row.createCell(1);
cell.setCellValue(country.full_ip_address);
cell = row.createCell(2);
cell.setCellValue(country.resource_name);
cell = row.createCell(3);
cell.setCellValue(country.serial_number);
cell = row.createCell(4);
cell.setCellValue(country.status);
cell = row.createCell(5);
cell.setCellValue(country.inactive);
cell = row.createCell(6);
cell.setCellValue(country.organistation);
cell = row.createCell(7);
cell.setCellValue(country.system_name);
cell = row.createCell(8);
cell.setCellValue(country.system_org);
cell = row.createCell(9);
cell.setCellValue(country.system_bus_crtcl);
cell = row.createCell(10);
cell.setCellValue(country.vlan_name);
cell = row.createCell(11);
cell.setCellValue(country.vlan_desc);
cell = row.createCell(12);
cell.setCellValue(country.vlan_contact );
cell = row.createCell(13);
cell.setCellValue(country.class_1);
cell = row.createCell(14);
cell.setCellValue(country.family);
cell = row.createCell(15);
cell.setCellValue(country.assignee_zid);
cell = row.createCell(16);
cell.setCellValue(country.contact_applied);
cell = row.createCell(17);
cell.setCellValue(country.assignee_type);
cell = row.createCell(18);
cell.setCellValue(country.assignee_email_address);
cell = row.createCell(19);
cell.setCellValue(country.assignee_org_name);
cell = row.createCell(20);
cell.setCellValue(country.assignee_full_name);
}
// ArrayList<Country> nation12 = nation11.replaceAll("\"","");
FileOutputStream outputStream = new FileOutputStream(excelFilePath);
// String abc = ((String) outputStream).replace("\""," ");
workbook.write(outputStream);
/* FileWriter writer1 = null;
writer1 = new FileWriter("D://abc.xls");*/
/*BufferedReader br2 = new BufferedReader(new FileReader("D://abc.xls"));
String newLine = " ";
while ((newLine = br2.readLine()) != null && !newLine.isEmpty())
{
System.out.println(newLine);
newLine = newLine.replace("\"", "");
}*/
}
// }
// parseCSV(); }
public static List readCSV() throws FileNotFoundException, IOException {
List countries = new ArrayList<>();
FileWriter writer = null;
String line = " ";
String oldContent = " ";
String newContent = " ";
// writer = new FileWriter("D://data1.csv");
BufferedReader br = new BufferedReader(new FileReader("D://data1.csv"));
// System.out.println(br.readLine());
while ((line = br.readLine()) != null && !line.isEmpty())
{
// System.out.println(line);
line = line.replace("|", ",");
oldContent = oldContent + line + System.lineSeparator();
// System.out.println("after change " + line);
// System.out.println("after change OLD" + oldContent);
// line.replaceAll("|",",");
}
//System.out.println("here am I " + oldContent);
// newContent = oldContent.replaceAll("|",",");
writer = new FileWriter("D://data1.csv");
writer.write(oldContent);
writer.close();
// line= oldContent;
// System.out.println(newContent);
BufferedReader br1 = new BufferedReader(new FileReader("D://data1.csv"));
line = " ";
line = br1.readLine(); // Reading header, Ignoring
//System.out.println("here am I again " + line);
while ((line = br1.readLine()) != null && !line.isEmpty()) {
String[] fields = line.split(",");
// System.out.println("fileds : " + fields[0]);
String ip_address = fields[0];
// System.out.println("before removing double quotes : " + ip_address);
ip_address = ip_address.replaceAll("\"", " ");
// System.out.println("after removing double quotes : " + ip_address);
String full_ip_address = fields[1];
full_ip_address = full_ip_address.replaceAll("\"", " ");
String resource_name = fields[2];
resource_name = resource_name.replaceAll("\"", " ");
String serial_number = fields[3];
serial_number = serial_number.replaceAll("\"", " ");
String status = fields[4];
status = status.replaceAll("\"", " ");
String inactive = fields[5];
inactive = inactive.replaceAll("\"", " ");
String organistation = fields[6];
organistation = organistation.replaceAll("\"", " ");
String system_name = fields[7];
system_name = system_name.replaceAll("\"", " ");
String system_org = fields[8];
system_org = system_org.replaceAll("\"", " ");
String system_bus_crtcl = fields[9];
system_bus_crtcl = system_bus_crtcl.replaceAll("\"", " ");
String vlan_name = fields[10];
vlan_name = vlan_name.replaceAll("\"", " ");
String vlan_desc = fields[11];
vlan_desc = vlan_desc.replaceAll("\"", " ");
String vlan_contact = fields[12];
vlan_contact = vlan_contact.replaceAll("\"", " ");
String class_1 = fields[13];
class_1 = class_1.replaceAll("\"", " ");
String family = fields[14];
family = family.replaceAll("\"", " ");
String assignee_zid = fields[15];
assignee_zid = assignee_zid.replaceAll("\"", " ");
String contact_applied = fields[16];
contact_applied = contact_applied.replaceAll("\"", " ");
String assignee_type = fields[17];
assignee_type = assignee_type.replaceAll("\"", " ");
String assignee_email_address = fields[18];
assignee_email_address = assignee_email_address.replaceAll("\"", " ");
String assignee_org_name = fields[19];
assignee_org_name = assignee_org_name.replaceAll("\"", " ");
String assignee_full_name = fields[20];
assignee_full_name = assignee_full_name.replaceAll("\"", " ");
Country nation = new Country(ip_address, full_ip_address, resource_name, serial_number,status,inactive,organistation,system_name,system_org,system_bus_crtcl,vlan_name,vlan_desc,vlan_contact,class_1,family,assignee_zid,contact_applied,assignee_type,assignee_email_address,assignee_org_name,assignee_full_name );
//System.out.println("am here : " + fields[1]);
countries.add(nation);
}
br.close();
return countries;
}
}
当我输入45k数据时，代码不会产生任何结果而不会抛出任何错误。你能建议吗。
答案 0 :(得分：0)
String excelFilePath = "D://abc.xlsx";
for.xlsx文件你应该使用
XSSFWorkbook wb = new XSSFWorkbook(); API
或将扩展名更改为
String excelFilePath = "D://abc.xls";
＆安培;把数据放在xls文件
上for (Country country : nation11) {
Row row = sheet.createRow(++rowCount);
// writeBook(aBook, row);
Cell cell = row.createCell(0);
cell.setCellValue(country.name);
cell = row.createCell(1);
cell.setCellValue(country.capital);
cell = row.createCell(2);
cell.setCellValue(country.currency);
}
它有效