项目地址：https://github.com/teprinciple/List2Excel
前言
在Android开发时，有些时候需要把app中List<Object>集合数据，导出到Excel表中，方便进一步操作。Android可以使用jxl或poi来导出Excel，关于jxl和poi的比较网上有很多说法，不过统一的说法就是jxl的操作比poi简单，但是其功能略低于poi，但是个人认为对于简单的表格导出，使用jxl就足够了。本文以jxl为例，快速导出Excel表格。
先看看效果图：
第一步、下载并导入jxl.jar包
jxl.jar包的下载地址：http://jexcelapi.sourceforge.net/
大家也可以到我的项目工程中直接拷贝，jar包的导入这里就不详细说明了。下面上代码，生成上图的成绩表。
第二步、生成表格
模拟数据、调用工具类生成表格
package teprinciple.yang.list2excel;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import com.shidian.excel.ExcelUtils;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private ArrayList<ArrayList<String>> recordList;
private List<Student> students;
private static String[] title = { "编号","姓名","性别","年龄","班级","数学","英语","语文" };
private File file;
private String fileName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//模拟数据集合
students = new ArrayList<>();
for (int i = 1; i <= 10; i++) {
students.add(new Student("小红"+i,"女","12","1"+i,"一班","85","77","98"));
students.add(new Student("小明"+i,"男","14","2"+i,"二班","65","57","100"));
}
}
/**
* 导出excel
* @param view
*/
public void exportExcel(View view) {
file = new File(getSDPath() + "/Record");
makeDir(file);
ExcelUtils.initExcel(file.toString() + "/成绩表.xls", title);
fileName = getSDPath() + "/Record/成绩表.xls";
ExcelUtils.writeObjListToExcel(getRecordData(), fileName, this);
}
/**
* 将数据集合 转化成ArrayList<ArrayList<String>>
* @return
*/
private ArrayList<ArrayList<String>> getRecordData() {
recordList = new ArrayList<>();
for (int i = 0; i <students.size(); i++) {
Student student = students.get(i);
ArrayList<String> beanList = new ArrayList<String>();
beanList.add(student.id);
beanList.add(student.name);
beanList.add(student.sex);
beanList.add(student.age);
beanList.add(student.classNo);
beanList.add(student.math);
beanList.add(student.english);
beanList.add(student.chinese);
recordList.add(beanList);
}
return recordList;
}
private String getSDPath() {
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
if (sdCardExist) {
sdDir = Environment.getExternalStorageDirectory();
}
String dir = sdDir.toString();
return dir;
}
public void makeDir(File dir) {
if (!dir.getParentFile().exists()) {
makeDir(dir.getParentFile());
}
dir.mkdir();
}
}
生成表格的核心工具类:
package com.shidian.excel;
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.format.Colour;
import jxl.write.Label;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
public class ExcelUtils {
public static WritableFont arial14font = null;
public static WritableCellFormat arial14format = null;
public static WritableFont arial10font = null;
public static WritableCellFormat arial10format = null;
public static WritableFont arial12font = null;
public static WritableCellFormat arial12format = null;
public final static String UTF8_ENCODING = "UTF-8";
public final static String GBK_ENCODING = "GBK";
/**
* 单元格的格式设置 字体大小 颜色 对齐方式、背景颜色等...
*/
public static void format() {
try {
arial14font = new WritableFont(WritableFont.ARIAL, 14, WritableFont.BOLD);
arial14font.setColour(jxl.format.Colour.LIGHT_BLUE);
arial14format = new WritableCellFormat(arial14font);
arial14format.setAlignment(jxl.format.Alignment.CENTRE);
arial14format.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THIN);
arial14format.setBackground(jxl.format.Colour.VERY_LIGHT_YELLOW);
arial10font = new WritableFont(WritableFont.ARIAL, 10, WritableFont.BOLD);
arial10format = new WritableCellFormat(arial10font);
arial10format.setAlignment(jxl.format.Alignment.CENTRE);
arial10format.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THIN);
arial10format.setBackground(Colour.GRAY_25);
arial12font = new WritableFont(WritableFont.ARIAL, 10);
arial12format = new WritableCellFormat(arial12font);
arial10format.setAlignment(jxl.format.Alignment.CENTRE);//对齐格式
arial12format.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THIN); //设置边框
} catch (WriteException e) {
e.printStackTrace();
}
}
/**
* 初始化Excel
* @param fileName
* @param colName
*/
public static void initExcel(String fileName, String[] colName) {
format();
WritableWorkbook workbook = null;
try {
File file = new File(fileName);
if (!file.exists()) {
file.createNewFile();
}
workbook = Workbook.createWorkbook(file);
WritableSheet sheet = workbook.createSheet("成绩表", 0);
//创建标题栏
sheet.addCell((WritableCell) new Label(0, 0, fileName,arial14format));
for (int col = 0; col < colName.length; col++) {
sheet.addCell(new Label(col, 0, colName[col], arial10format));
}
sheet.setRowView(0,340); //设置行高
workbook.write();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (workbook != null) {
try {
workbook.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
@SuppressWarnings("unchecked")
public static <T> void writeObjListToExcel(List<T> objList,String fileName, Context c) {
if (objList != null && objList.size() > 0) {
WritableWorkbook writebook = null;
InputStream in = null;
try {
WorkbookSettings setEncode = new WorkbookSettings();
setEncode.setEncoding(UTF8_ENCODING);
in = new FileInputStream(new File(fileName));
Workbook workbook = Workbook.getWorkbook(in);
writebook = Workbook.createWorkbook(new File(fileName),workbook);
WritableSheet sheet = writebook.getSheet(0);
// sheet.mergeCells(0,1,0,objList.size()); //合并单元格
// sheet.mergeCells()
for (int j = 0; j < objList.size(); j++) {
ArrayList<String> list = (ArrayList<String>) objList.get(j);
for (int i = 0; i < list.size(); i++) {
sheet.addCell(new Label(i, j + 1, list.get(i),arial12format));
if (list.get(i).length() <= 5){
sheet.setColumnView(i,list.get(i).length()+8); //设置列宽
}else {
sheet.setColumnView(i,list.get(i).length()+5); //设置列宽
}
}
sheet.setRowView(j+1,350); //设置行高
}
writebook.write();
Toast.makeText(c, "导出到手机存储中文件夹Record成功", Toast.LENGTH_SHORT).show();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (writebook != null) {
try {
writebook.close();
} catch (Exception e) {
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
}
这样就在手机的文件夹中生成成绩表.xls表。
注意：需要添加WRITE_EXTERNAL_STORAGE权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
就简单介绍到这里了。
更多关于jxl的相关方法可以参考文档：http://jexcelapi.sourceforge.net/resources/javadocs/current/docs/
poi的相关内容：https://poi.apache.org/
以上deom的源码地址：https://github.com/teprinciple/List2Excel
