Android sql 数据库的导出到excel中

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Environment;
import android.util.Log;

import java.io.File;
import java.io.IOException;

import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
import jxl.write.WriteException;
import jxl.write.biff.RowsExceededException;

/**
* Created by Administrator on 2016/8/1.
*/
public class DatabaseDump {

private SQLiteDatabase mDb;

public DatabaseDump(SQLiteDatabase db) {
mDb = db;

}

public void exportData() {

try {

//  Log.i("mdb", mDb.getPath());
// get the tables out of the given sqlite database
String sql = "SELECT * FROM sqlite_master";

Cursor cur = mDb.rawQuery(sql, new String[0]);
cur.moveToFirst();

String tableName;
while (cur.getPosition() < cur.getCount()) {
tableName = cur.getString(cur.getColumnIndex("name"));

// don't process these two tables since they are used
// for metadata
if (!tableName.equals("android_metadata")
&& !tableName.equals("sqlite_sequence")) {
writeExcel(tableName);
}
cur.moveToNext();
}
} catch (Exception e) {
e.printStackTrace();
}
}

/*    要生成的Excel文件名*/

public void writeExcel(String tableName) {
WritableWorkbook wwb = null;
String fileName;
fileName = Environment.getExternalStorageDirectory().getPath().toString()+File.separator +
tableName + ".xls";

File isexist = new File(fileName);
if (!isexist.exists())
{
try {
isexist.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
int r = 0;
Log.e("datadump","writeexcel");
String sql = "select * from " + tableName;
Cursor cur = mDb.rawQuery(sql, new String[0]);
int numcols = cur.getColumnCount();
int numrows = cur.getCount();
// Log.i("row", numrows + "");
// Log.i("col", numcols + "");

String records[][] = new String[numrows + 1][numcols];// 存放答案，多一行标题行
if (cur.moveToFirst()) {
while (cur.getPosition() < cur.getCount()) {
for (int c = 0; c < numcols; c++) {
if (r == 0) {
records[r][c] = cur.getColumnName(c);
records[r + 1][c] = cur.getString(c);
} else {
records[r + 1][c] = cur.getString(c);
}
//  Log.i("value" + r + " " + c, records[r][c]);
}
cur.moveToNext();
r++;
}

cur.close();
}
try {
// 首先要使用Workbook类的工厂方法创建一个可写入的工作薄(Workbook)对象
wwb = Workbook.createWorkbook(new File(fileName));
} catch (IOException e) {
e.printStackTrace();
}
if (wwb != null) {
// 创建一个可写入的工作表
// Workbook的createSheet方法有两个参数，第一个是工作表的名称，第二个是工作表在工作薄中的位置
WritableSheet ws = wwb.createSheet("Result", 0);    // 下面开始添加单元格
for (int i = 0; i < numrows + 1; i++) {
for (int j = 0; j < numcols; j++) {
// 这里需要注意的是，在Excel中，第一个参数表示列，第二个表示行
Label labelC = new Label(j, i, records[i][j]);
//        Log.i("Newvalue" + i + " " + j, records[i][j]);
try {
// 将生成的单元格添加到工作表中
ws.addCell(labelC);
} catch (RowsExceededException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
}

}
}
try {
// 从内存中写入文件中
wwb.write();
// 关闭资源，释放内存
wwb.close();
} catch (IOException e) {
e.printStackTrace();
} catch (WriteException e) {
e.printStackTrace();
}
}
}
}