运用存储过程将excel转置导出
下面是存储过程
DELIMITER $$
USE `cstzjusf`$$
DROP PROCEDURE IF EXISTS `getTaskInfo`$$
CREATE DEFINER=`root`@`localhost` PROCEDURE `getTaskInfo`(IN Task_id INT)
READS SQL DATA
BEGIN
SET @sql = NULL;
SET @Task_id = Task_id;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT(
'MAX(IF(cti.Taskinfo_name = ''',
cti.Taskinfo_name,
''', ctu.value, NULL)) AS ''',
cti.Taskinfo_name, ''''
)
) INTO @sql
FROM cst_task_info cti WHERE cti.Task_id = @Task_id;
SET @sql = CONCAT('Select DISTINCT(ct.Task_id),ct.Task_name,cu.student_id,cu.student_name,', @sql,
' From cst_taskinfo_user ctu
LEFT JOIN cst_task ct ON ctu.Task_id = ct.Task_id
LEFT JOIN cst_task_info cti ON ctu.taskInfo_id = cti.Taskinfo_id
LEFT JOIN cst_users cu ON ctu.user_id = cu.student_id
');
SET @sql = CONCAT(@sql,'Where ct.Task_id = ''',@Task_id,''' ');
SET @sql = CONCAT(@sql, ' Group by cu.student_id');
PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END$$
DELIMITER ;
在java代码中运用如下,进行调用
/**
* 获取数据库连接
* @return Connection对象
*/
public Connection getConnection()
{
Connection conn = null; //数据库连接
try
{
Class.forName("com.mysql.jdbc.Driver"); //加载数据库驱动,注册到驱动管理器
/*数据库链接地址*/
String url = "jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=UTF-8";
String username = "root";
String password = "root";
/*创建Connection链接*/
conn = DriverManager.getConnection(url, username, password);
}
catch (ClassNotFoundException e){
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn; //返回数据库连接
}
/**
* 通过存储过程查询数据
* @return List<Book>
*/
public List findTaskInfoByTaskId(String TaskId)
{
// List <CstTaskinfoUserEx> list = new ArrayList<CstTaskinfoUserEx>(); //实例化List对象
List list = new ArrayList();
Connection conn = getConnection(); //创建数据库连接
try
{
//调用存储过程
CallableStatement cs = conn.prepareCall("{call getTaskInfo(?)}");
cs.setInt(1, Integer.parseInt(TaskId));
ResultSet rs = cs.executeQuery(); //执行查询操作,并获取结果集
ResultSetMetaData md = rs.getMetaData();
int columnCount = md.getColumnCount();
while(rs.next())
{
Map<String,Object> rowData = new HashMap<String,Object>();
for(int i = 1; i <= columnCount;i++){
rowData.put(md.getColumnName(i), rs.getObject(i));
}
list.add(rowData);
}
}catch(Exception e)
{
e.printStackTrace();
}
return list; //返回list
}
@Override
public void exportExcel2(String TaskId,
OutputStream out) {
HashMap map = new HashMap<>();
List<String> listOfTitle = new ArrayList<String>();
List<String> listOfFinal = new ArrayList<String>();
listOfTitle.add("任务编号");
listOfTitle.add("任务名称");
listOfTitle.add("学号");
listOfTitle.add("学生姓名");
listOfFinal.add("Task_id");
listOfFinal.add("Task_name");
listOfFinal.add("student_id");
listOfFinal.add("student_name");
// map.put("queryQarameterSQL", this.setQueryValue(cstTask));
//List<CstTaskinfoUserEx> list = cstTaskinfoUserMapperEx.selectByExample2(map);
List<CstTaskinfoUserEx> list = this.findTaskInfoByTaskId(TaskId);
List listKey = new ArrayList();
Map mapResult = (Map)list.get(0);
Set mapKeySet = mapResult.keySet();
String listHead = "";
String keyOfListMapKey = "";
Iterator iteratorKey = mapKeySet.iterator();
String listValue = "";
while(iteratorKey.hasNext()){
listHead = iteratorKey.next()+"";
listKey.add(listHead);
}
for(int i = 0;i < listKey.size();i ++){
if(!"Task_name".equals(listKey.get(i))&& !"student_name".equals(listKey.get(i)) && !"student_id".equals(listKey.get(i)) && !"Task_id".equals(listKey.get(i))){
listOfTitle.add((String) listKey.get(i));
listOfFinal.add((String) listKey.get(i));
// listOfFinal.add(list.get(i).);
}
// listOfTitle.add(list.get(i));
// listOfFinal.add("value");
}
String[] headTitle = listOfTitle.toArray(new String[listOfTitle.size()]);
String[] finalValue = listOfFinal.toArray(new String[listOfFinal.size()]);
ExportExcel<CstTaskinfoUserEx> exportExcel = new ExportExcel<CstTaskinfoUserEx>();
exportExcel.exportExcel1("导出正在进行任务信息", headTitle,finalValue, list, out,"yyyy-MM-dd");
}
下面是导出函数
/**
* 这是一个通用的方法,利用了JAVA的反射机制,可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
*
* @param title
* 表格标题名
* @param headers
* 表格属性列名数组
* @param fieldNames
* 定义需要导出的javabean的属性数组
* @param dataset
* 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
* javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
* @param out
* 与输出设备关联的流对象,可以将EXCEL文档导出到本地文件或者网络中
* @param pattern
* 如果有时间数据,设定输出格式。默认为"yyy-MM-dd"
*/
@SuppressWarnings("unchecked")
public void exportExcel1(String title, String[] headers,String[] fieldNames,
List dataset, OutputStream out, String pattern) {
// 声明一个工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 生成一个表格
HSSFSheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为15个字节
sheet.setDefaultColumnWidth((short) 15);
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
HSSFFont font3 = workbook.createFont();
font3.setColor(HSSFColor.BLUE.index);
// 设置这些样式
style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式
style.setFont(font);
// 生成并设置另一个样式
HSSFCellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
style2.setWrapText(true);//设置自动换行
// 生成另一个字体
HSSFFont font2 = workbook.createFont();
font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);
// 声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置,详见文档
HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0, 0, 0, 0, (short) 4, 2, (short) 6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("可以在POI中添加注释!"));
// 设置注释作者,当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("leno");
//产生表格标题行
HSSFRow row = sheet.createRow(0);
for (short i = 0; i < headers.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style);
HSSFRichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
//遍历集合数据,产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
int flag = 0;
int size = dataset.size();
Map mapResult = null;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
T t = (T) it.next();
if(flag<size){
mapResult = (Map)dataset.get(flag++);
}
// T t = (T) it.next();
//利用反射,根据javabean属性的先后顺序,动态调用getXxx()方法得到属性值
// Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < fieldNames.length; i++) {
HSSFCell cell = row.createCell(i);
cell.setCellStyle(style2);
// Field field = fields[i];
/* String fieldName = fieldNames[i];
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);*/
try {
Object value = mapResult.get(fieldNames[i]);
/* Class tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName,
new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});*/
//判断值的类型后进行强制类型转换
String textValue = null;
// if (value instanceof Integer) {
// int intValue = (Integer) value;
// cell.setCellValue(intValue);
// } else if (value instanceof Float) {
// float fValue = (Float) value;
// textValue = new HSSFRichTextString(
// String.valueOf(fValue));
// cell.setCellValue(textValue);
// } else if (value instanceof Double) {
// double dValue = (Double) value;
// textValue = new HSSFRichTextString(
// String.valueOf(dValue));
// cell.setCellValue(textValue);
// } else if (value instanceof Long) {
// long longValue = (Long) value;
// cell.setCellValue(longValue);
// }
if (value instanceof Boolean) {
boolean bValue = (Boolean) value;
textValue = "男";
if (!bValue) {
textValue ="女";
}
} else if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else if (value instanceof byte[]) {
// 有图片时,设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(i, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(2);
patriarch.createPicture(anchor, workbook.addPicture(
bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
} else{
//其它数据类型都当作字符串简单处理
textValue = value == null?"":value.toString();
}
//如果不是图片数据,就利用正则表达式判断textValue是否全部由数字组成
if(textValue!=null){
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if(matcher.matches()){
//是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
}else{
HSSFRichTextString richString = new HSSFRichTextString(textValue);
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
/* } catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();*/
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
/* } catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();*/
} finally {
//清理资源
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
以上