java利用poi来读取execl表格返回对象

Posted 2020-10-31 我想回家

利用poi来读取execl表格,返回一个对象(可能有点不完善,但是应该能满足平常的所用),用到了反射等等;

使用的jar包有:

commons-collections4-4.1.jar

poi-3.17.jar

poi-ooxml.3.17.jar

poi-ooxml-schemas.3.17.jar

xmllbeans-2.6.0.jar

/**
* 静态属性包
* @author Administrator
*
*/
public class Common {

public static final String OFFICE_EXCEL_2003_POSTFIX = "xls";
public static final String OFFICE_EXCEL_2010_POSTFIX = "xlsx";

public static final String EMPTY = "";
public static final String POINT = ".";
public static final String LIB_PATH = "lib";
/*public static final String STUDENT_INFO_XLS_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2003_POSTFIX;
public static final String STUDENT_INFO_XLSX_PATH = LIB_PATH + "/student_info" + POINT + OFFICE_EXCEL_2010_POSTFIX;*/
public static final String NOT_EXCEL_FILE = " : Not the Excel file!";
public static final String PROCESSING = "Processing...";

}

 

import java.lang.reflect.Field;
/**
* 工具包
* @author Administrator
*
*/
public class Util {

public static String getPostfix(String path) {
if (path == null || Common.EMPTY.equals(path.trim())) {
return Common.EMPTY;
}
if (path.contains(Common.POINT)) {
return path.substring(path.lastIndexOf(Common.POINT) + 1, path.length());
}
return Common.EMPTY;
}

// 获取属性的类型
public static String getFileType(Field field) {

// 如果类型是String
if (field.getGenericType().toString().equals("class java.lang.String")) { // 如果type是类类型，则前面包含"class
return "String";
}


// 如果类型是String
if (field.getGenericType().toString().equals("int")) { // 如果type是类类型，则前面包含"class
return "int";
}

// 如果类型是String
if (field.getGenericType().toString().equals("double")) { // 如果type是类类型，则前面包含"class
return "double";
}

// 如果类型是Integer
if (field.getGenericType().toString().equals("class java.lang.Integer")) {
return "Integer";
}

// 如果类型是Double
if (field.getGenericType().toString().equals("class java.lang.Double")) {
return "Double";
}

// 如果类型是Boolean 是封装类
if (field.getGenericType().toString().equals("class java.lang.Boolean")) {
return "Boolean";

}

// 如果类型是boolean 基本数据类型不一样 这里有点说名如果定义名是 isXXX的 那就全都是isXXX的
if (field.getGenericType().toString().equals("boolean")) {
return "boolean";
}
// 如果类型是Date
if (field.getGenericType().toString().equals("class java.util.Date")) {
return "Date";
}
// 如果类型是Short
if (field.getGenericType().toString().equals("class java.lang.Short")) {
return "Short";
}
return "null";

}

}

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

/**
* 由于jxl停止更新,因此使用poi来进行excel的表格的读入
*
* @author Administrator
*
*/
public class ReadExcel {

public List<Object> readExcel(String path, Object o) throws IOException {
if (path == null || Common.EMPTY.equals(path)) {
return null;
} else {
String postfix = Util.getPostfix(path);
if (!Common.EMPTY.equals(postfix)) {
if (Common.OFFICE_EXCEL_2003_POSTFIX.equals(postfix)) {
return readXls(path, o);
} else if (Common.OFFICE_EXCEL_2010_POSTFIX.equals(postfix)) {
return readXlsx(path, o);
}
} else {
System.out.println(path + Common.NOT_EXCEL_FILE);
}
}
return null;
}

@SuppressWarnings("resource")
public List<Object> readXlsx(String path, Object object) throws IOException {

System.out.println(Common.PROCESSING + path);
InputStream is = new FileInputStream(path);
XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is);
List<Object> list = new ArrayList<Object>();

// Read the Sheet
for (int numSheet = 0; numSheet < xssfWorkbook.getNumberOfSheets(); numSheet++) {
XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(numSheet);
if (xssfSheet == null) {
continue;
}
// Read the Row
for (int rowNum = 1; rowNum <= xssfSheet.getLastRowNum(); rowNum++) {
XSSFRow xssfRow = xssfSheet.getRow(rowNum);
if (xssfRow != null) {
// 根据反射获取对象的属性名
String[] str = getFiledName(object);
for (int i = 0; i < str.length; i++) {
try {
// 根据对象的属性名来给对象赋值
Field f = object.getClass().getDeclaredField(str[i]);
// 设置对象属性可见
f.setAccessible(true);
XSSFCell temp = xssfRow.getCell(i);
// 赋值
String type = Util.getFileType(f);

if(type.equals("String")) {
f.set(object, temp.getStringCellValue());
} else if(type.equals("Integer")) {
f.set(object, (int)(temp.getNumericCellValue()));
} else if(type.equals("int")) {
f.set(object, (int)(temp.getNumericCellValue()));
} else if(type.equals("double")) {
f.set(object,(temp.getNumericCellValue()));
} else if(type.equals("Double")) {
f.set(object, (temp.getNumericCellValue()));
} else if(type.equals("boolean")) {
f.set(object, (temp.getBooleanCellValue()));
} else if(type.equals("Boolean")){
f.set(object, (temp.getBooleanCellValue()));
} else if(type.equals("Date")) {
f.set(object, (temp.getDateCellValue()));
} else {
f.set(object, temp.getStringCellValue());
}

} catch (Exception e) {
e.printStackTrace();
}
}
try {
// 拷贝Object对象
Class<?> fromClass = object.getClass();
// 获取属性名
Field[] fromFields = fromClass.getDeclaredFields();
// 创建拷贝的对象
Object ints = null;
// 赋值拷贝的对象
ints = fromClass.newInstance();
for(Field fromField : fromFields) {
fromField.setAccessible(true);
fromField.set(ints, fromField.get(object));
}
list.add(ints);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
}
return list;
}

public List<Object> readXls(String path, Object object) throws IOException {
System.out.println(Common.PROCESSING + path);
InputStream is = new FileInputStream(path);
@SuppressWarnings("resource")
HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
List<Object> list = new ArrayList<Object>();
// Read the Sheet
for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
if (hssfSheet == null) {
continue;
}
// Read the Row
for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
HSSFRow hssfRow = hssfSheet.getRow(rowNum);
if (hssfRow != null) {
// 根据反射获取对象的属性名
String[] str = getFiledName(object);
for (int i = 0; i < str.length; i++) {
try {
// 根据对象的属性名来给对象赋值
Field f = object.getClass().getDeclaredField(str[i]);
// 设置对象属性可见
f.setAccessible(true);
HSSFCell temp = hssfRow.getCell(i);
// 赋值
// 赋值
String type = Util.getFileType(f);

if(type.equals("String")) {
f.set(object, temp.getStringCellValue());
} else if(type.equals("Integer")) {
f.set(object, (int)(temp.getNumericCellValue()));
} else if(type.equals("int")) {
f.set(object, (int)(temp.getNumericCellValue()));
} else if(type.equals("double")) {
f.set(object,(temp.getNumericCellValue()));
} else if(type.equals("Double")) {
f.set(object, (temp.getNumericCellValue()));
} else if(type.equals("boolean")) {
f.set(object, (temp.getBooleanCellValue()));
} else if(type.equals("Boolean")){
f.set(object, (temp.getBooleanCellValue()));
} else if(type.equals("Date")) {
f.set(object, (temp.getDateCellValue()));
} else {
f.set(object, temp.getStringCellValue());
}
} catch (Exception e) {
e.printStackTrace();
}
}
try {
// 拷贝Object对象
Class<?> fromClass = object.getClass();
// 获取属性名
Field[] fromFields = fromClass.getDeclaredFields();
// 创建拷贝的对象
Object ints = null;
// 赋值拷贝的对象
ints = fromClass.newInstance();
for(Field fromField : fromFields) {
fromField.setAccessible(true);
fromField.set(ints, fromField.get(object));
}
list.add(ints);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

}
}
}
return list;
}

@SuppressWarnings("unused")
private String[] getFiledName(Object o) {
Field[] fields = o.getClass().getDeclaredFields();
String[] fieldNames = new String[fields.length];
for (int i = 0; i < fields.length; i++) {
fieldNames[i] = fields[i].getName();
}
return fieldNames;
}

}

下面利用student来示范一下

/**
* 实体类
* @author Administrator
*
*/
public class Student{

/**
* id
*/
private int id;
/**
* 姓名
*/
private String name;
/**
* 性别
*/
private String sex;
/**
* 年龄
*/
private int age;
/**
* 职位
*/
private String title;

public Student() {
super();
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + ", title=" + title + "]";
}

}

import java.io.IOException;
import java.util.List;
/**
* 测试类
* @author Administrator
*
*/
public class TestDemo {

public static void main(String[] args) throws IOException {

String excel2010 = "H:\\MyTest\\Java\\test.xls";
// read the 2010 excel
Student student = new Student();
List<Object> list1 = new ReadExcel().readExcel(excel2010,student);
if (list1 != null) {
for (Object o : list1) {
Student s = (Student)o;
System.out.println(s);
}
}
}
}

 

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