本文章來自【知識(shí)林】
前面講述了使用POI導(dǎo)出Word文件和讀取Excel文件霹肝,這兩個(gè)例子都相對(duì)簡(jiǎn)單估蹄,接下來要講述的使用POI導(dǎo)出Excel文件要復(fù)雜得多,內(nèi)容也會(huì)比較長(zhǎng)沫换。
- 創(chuàng)建表頭信息
表頭信息用于自動(dòng)生成表頭結(jié)構(gòu)及排序
public class ExcelHeader implements Comparable<ExcelHeader>{
/**
* excel的標(biāo)題名稱
*/
private String title;
/**
* 每一個(gè)標(biāo)題的順序
*/
private int order;
/**
* 說對(duì)應(yīng)方法名稱
*/
private String methodName;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getOrder() {
return order;
}
public void setOrder(int order) {
this.order = order;
}
public String getMethodName() {
return methodName;
}
public void setMethodName(String methodName) {
this.methodName = methodName;
}
public int compareTo(ExcelHeader o) {
return order>o.order?1:(order<o.order?-1:0);
}
public ExcelHeader(String title, int order, String methodName) {
super();
this.title = title;
this.order = order;
this.methodName = methodName;
}
}
- 表頭信息的Annotation
/**
* 用來在對(duì)象的get方法上加入的annotation臭蚁,通過該annotation說明某個(gè)屬性所對(duì)應(yīng)的標(biāo)題
* Created by 鐘述林 393156105@qq.com on 2016/10/29 0:14.
*/
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelResources {
/**
* 屬性的標(biāo)題名稱
* @return
*/
String title();
/**
* 在excel的順序
* @return
*/
int order() default 9999;
}
- 創(chuàng)建數(shù)據(jù)實(shí)體
public class WebDto {
//網(wǎng)站名稱
private String name;
//網(wǎng)址
private String url;
//用戶名
private String username;
//密碼
private String password;
//日均訪問量
private Integer readCount;
public WebDto(String name, String url, String username, String password, Integer readCount) {
this.name = name;
this.url = url;
this.username = username;
this.password = password;
this.readCount = readCount;
}
public WebDto() {}
@Override
public String toString() {
return "WebDto{" +
"name='" + name + '\'' +
", url='" + url + '\'' +
", username='" + username + '\'' +
", password='" + password + '\'' +
", readCount=" + readCount +
'}';
}
@ExcelResources(title="網(wǎng)站名稱",order=1)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ExcelResources(title="網(wǎng)址",order=2)
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
@ExcelResources(title="用戶名",order=3)
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@ExcelResources(title="密碼",order=4)
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@ExcelResources(title="日均訪問量",order=5)
public Integer getReadCount() {
return readCount;
}
public void setReadCount(Integer readCount) {
this.readCount = readCount;
}
}
注意:這里使用到了@ExcelResources
來自動(dòng)識(shí)別表頭信息及序號(hào)
- 獲取模板文件的工具類
public class TemplateFileUtil {
public static FileInputStream getTemplates(String tempName) throws FileNotFoundException {
return new FileInputStream(ResourceUtils.getFile("classpath:excel-templates/"+tempName));
}
}
注意:從這里可以看出,所有的Excel模板文件都放在resources/excel-templates/
目錄下讯赏。
- 模板工具類
通過此類可以自動(dòng)復(fù)制表樣式等功能
/**
* 該類實(shí)現(xiàn)了基于模板的導(dǎo)出
* 如果要導(dǎo)出序號(hào)垮兑,需要在excel中定義一個(gè)標(biāo)識(shí)為sernums
* 如果要替換信息,需要傳入一個(gè)Map漱挎,這個(gè)map中存儲(chǔ)著要替換信息的值系枪,在excel中通過#來開頭
* 要從哪一行那一列開始替換需要定義一個(gè)標(biāo)識(shí)為datas
* 如果要設(shè)定相應(yīng)的樣式,可以在該行使用styles完成設(shè)定磕谅,此時(shí)所有此行都使用該樣式
* 如果使用defaultStyls作為表示私爷,表示默認(rèn)樣式,如果沒有defaultStyles使用datas行作為默認(rèn)樣式
* Created by 鐘述林 393156105@qq.com on 2016/10/28 23:38.
*/
public class ExcelTemplate {
/**
* 數(shù)據(jù)行標(biāo)識(shí)
*/
public final static String DATA_LINE = "datas";
/**
* 默認(rèn)樣式標(biāo)識(shí)
*/
public final static String DEFAULT_STYLE = "defaultStyles";
/**
* 行樣式標(biāo)識(shí)
*/
public final static String STYLE = "styles";
/**
* 插入序號(hào)樣式標(biāo)識(shí)
*/
public final static String SER_NUM = "sernums";
private static ExcelTemplate et = new ExcelTemplate();
private Workbook wb;
private Sheet sheet;
/**
* 數(shù)據(jù)的初始化列數(shù)
*/
private int initColIndex;
/**
* 數(shù)據(jù)的初始化行數(shù)
*/
private int initRowIndex;
/**
* 當(dāng)前列數(shù)
*/
private int curColIndex;
/**
* 當(dāng)前行數(shù)
*/
private int curRowIndex;
/**
* 當(dāng)前行對(duì)象
*/
private Row curRow;
/**
* 最后一行的數(shù)據(jù)
*/
private int lastRowIndex;
/**
* 默認(rèn)樣式
*/
private CellStyle defaultStyle;
/**
* 默認(rèn)行高
*/
private float rowHeight;
/**
* 存儲(chǔ)某一方所對(duì)于的樣式
*/
private Map<Integer,CellStyle> styles;
/**
* 序號(hào)的列
*/
private int serColIndex;
private ExcelTemplate(){
}
public static ExcelTemplate getInstance() {
return et;
}
/**
* 從classpath路徑下讀取相應(yīng)的模板文件
* @param path
* @return
*/
public ExcelTemplate readTemplateByClasspath(String path) {
try {
wb = new HSSFWorkbook(TemplateFileUtil.getTemplates(path));
initTemplate();
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("讀取模板不存在膊夹!請(qǐng)檢查");
}
return this;
}
/**
* 將文件寫到相應(yīng)的路徑下
* @param filepath
*/
public void writeToFile(String filepath) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(filepath);
wb.write(fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new RuntimeException("寫入的文件不存在");
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("寫入數(shù)據(jù)失敗:"+e.getMessage());
} finally {
try {
if(fos!=null) fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 將文件寫到某個(gè)輸出流中
* @param os
*/
public void wirteToStream(OutputStream os) {
try {
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("寫入流失敗:"+e.getMessage());
}
}
/**
* 從某個(gè)路徑來讀取模板
* @param path
* @return
*/
public ExcelTemplate readTemplateByPath(String path) {
try {
wb = new HSSFWorkbook(TemplateFileUtil.getTemplates(path));
initTemplate();
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException("讀取模板不存在衬浑!請(qǐng)檢查");
}
return this;
}
/**
* 創(chuàng)建相應(yīng)的元素,基于String類型
* @param value
*/
public void createCell(String value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value);
curColIndex++;
}
public void createCell(int value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue((int)value);
curColIndex++;
}
public void createCell(Date value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value);
curColIndex++;
}
public void createCell(double value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value);
curColIndex++;
}
public void createCell(boolean value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value);
curColIndex++;
}
public void createCell(Calendar value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value);
curColIndex++;
}
public void createCell(BigInteger value) {
Cell c = curRow.createCell(curColIndex);
setCellStyle(c);
c.setCellValue(value==null?0:value.intValue());
curColIndex++;
}
/**
* 設(shè)置某個(gè)元素的樣式
* @param c
*/
private void setCellStyle(Cell c) {
if(styles.containsKey(curColIndex)) {
c.setCellStyle(styles.get(curColIndex));
} else {
c.setCellStyle(defaultStyle);
}
}
/**
* 創(chuàng)建新行放刨,在使用時(shí)只要添加完一行工秩,需要調(diào)用該方法創(chuàng)建
*/
public void createNewRow() {
if(lastRowIndex>curRowIndex&&curRowIndex!=initRowIndex) {
sheet.shiftRows(curRowIndex, lastRowIndex, 1,true,true);
lastRowIndex++;
}
curRow = sheet.createRow(curRowIndex);
curRow.setHeightInPoints(rowHeight);
curRowIndex++;
curColIndex = initColIndex;
}
/**
* 插入序號(hào),會(huì)自動(dòng)找相應(yīng)的序號(hào)標(biāo)示的位置完成插入
*/
public void insertSer() {
int index = 1;
Row row = null;
Cell c = null;
for(int i=initRowIndex;i<curRowIndex;i++) {
row = sheet.getRow(i);
c = row.createCell(serColIndex);
setCellStyle(c);
c.setCellValue(index++);
}
}
/**
* 根據(jù)map替換相應(yīng)的常量,通過Map中的值來替換#開頭的值
* @param datas
*/
public void replaceFinalData(Map<String,String> datas) {
if(datas==null) return;
for(Row row:sheet) {
for(Cell c:row) {
// if(c.getCellType()!=Cell.CELL_TYPE_STRING) continue;
String str = c.getStringCellValue().trim();
if(str.startsWith("#")) {
if(datas.containsKey(str.substring(1))) {
c.setCellValue(datas.get(str.substring(1)));
}
}
}
}
}
/**
* 基于Properties的替換助币,依然也是替換#開始的
* @param prop
*/
public void replaceFinalData(Properties prop) {
if(prop==null) return;
for(Row row:sheet) {
for(Cell c:row) {
// if(c.getCellType()!=Cell.CELL_TYPE_STRING) continue;
String str = c.getStringCellValue().trim();
if(str.startsWith("#")) {
if(prop.containsKey(str.substring(1))) {
c.setCellValue(prop.getProperty(str.substring(1)));
}
}
}
}
}
private void initTemplate() {
sheet = wb.getSheetAt(0);
initConfigData();
lastRowIndex = sheet.getLastRowNum();
curRow = sheet.createRow(curRowIndex);
}
/**
* 初始化數(shù)據(jù)信息
*/
private void initConfigData() {
boolean findData = false;
boolean findSer = false;
for(Row row:sheet) {
if(findData) break;
for(Cell c:row) {
// if(c.getCellType()!=Cell.CELL_TYPE_STRING) continue;
String str = c.getStringCellValue().trim();
if(str.equals(SER_NUM)) {
serColIndex = c.getColumnIndex();
findSer = true;
}
if(str.equals(DATA_LINE)) {
initColIndex = c.getColumnIndex();
initRowIndex = row.getRowNum();
curColIndex = initColIndex;
curRowIndex = initRowIndex;
findData = true;
defaultStyle = c.getCellStyle();
rowHeight = row.getHeightInPoints();
initStyles();
break;
}
}
}
if(!findSer) {
initSer();
}
}
/**
* 初始化序號(hào)位置
*/
private void initSer() {
for(Row row:sheet) {
for(Cell c:row) {
// if(c.getCellType()!=Cell.CELL_TYPE_STRING) continue;
String str = c.getStringCellValue().trim();
if(str.equals(SER_NUM)) {
serColIndex = c.getColumnIndex();
}
}
}
}
/**
* 初始化樣式信息
*/
private void initStyles() {
styles = new HashMap<Integer, CellStyle>();
for(Row row:sheet) {
for(Cell c:row) {
// if(c.getCellType()!=Cell.CELL_TYPE_STRING) continue;
String str = c.getStringCellValue().trim();
if(str.equals(DEFAULT_STYLE)) {
defaultStyle = c.getCellStyle();
}
if(str.equals(STYLE)) {
styles.put(c.getColumnIndex(), c.getCellStyle());
}
}
}
}
}
- 操作工具類
/**
* 該類實(shí)現(xiàn)了將一組對(duì)象轉(zhuǎn)換為Excel表格浪听,并且可以從Excel表格中讀取到一組List對(duì)象中
* 該類利用了BeanUtils框架中的反射完成
* 使用該類的前提,在相應(yīng)的實(shí)體對(duì)象上通過ExcelReources來完成相應(yīng)的注解
* Created by 鐘述林 393156105@qq.com on 2016/10/29 0:15.
*/
public class ExcelUtil {
private static ExcelUtil eu = new ExcelUtil();
private ExcelUtil(){}
public static ExcelUtil getInstance() {
return eu;
}
/**
* 處理對(duì)象轉(zhuǎn)換為Excel
* @param template
* @param objs
* @param clz
* @param isClasspath
* @return
*/
private ExcelTemplate handlerObj2Excel (String template, List objs, Class clz, boolean isClasspath) {
ExcelTemplate et = ExcelTemplate.getInstance();
try {
if(isClasspath) {
et.readTemplateByClasspath(template);
} else {
et.readTemplateByPath(template);
}
List<ExcelHeader> headers = getHeaderList(clz);
Collections.sort(headers);
//輸出標(biāo)題
et.createNewRow();
for(ExcelHeader eh:headers) {
et.createCell(eh.getTitle());
}
//輸出值
for(Object obj:objs) {
et.createNewRow();
for(ExcelHeader eh:headers) {
// Method m = clz.getDeclaredMethod(mn);
// Object rel = m.invoke(obj);
et.createCell(BeanUtils.getProperty(obj,getMethodName(eh)));
}
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
return et;
}
/**
* 根據(jù)標(biāo)題獲取相應(yīng)的方法名稱
* @param eh
* @return
*/
private String getMethodName(ExcelHeader eh) {
String mn = eh.getMethodName().substring(3);
mn = mn.substring(0,1).toLowerCase()+mn.substring(1);
return mn;
}
/**
* 將對(duì)象轉(zhuǎn)換為Excel并且導(dǎo)出奠支,該方法是基于模板的導(dǎo)出馋辈,導(dǎo)出到流
* @param datas 模板中的替換的常量數(shù)據(jù)
* @param template 模板路徑
* @param os 輸出流
* @param objs 對(duì)象列表
* @param clz 對(duì)象的類型
* @param isClasspath 模板是否在classPath路徑下
*/
public void exportObj2ExcelByTemplate(Map<String,String> datas, String template, OutputStream os, List objs, Class clz, boolean isClasspath) {
try {
ExcelTemplate et = handlerObj2Excel(template, objs, clz, isClasspath);
et.replaceFinalData(datas);
et.wirteToStream(os);
os.flush();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 將對(duì)象轉(zhuǎn)換為Excel并且導(dǎo)出抚芦,該方法是基于模板的導(dǎo)出倍谜,導(dǎo)出到一個(gè)具體的路徑中
* @param datas 模板中的替換的常量數(shù)據(jù)
* @param template 模板路徑
* @param outPath 輸出路徑
* @param objs 對(duì)象列表
* @param clz 對(duì)象的類型
* @param isClasspath 模板是否在classPath路徑下
*/
public void exportObj2ExcelByTemplate(Map<String,String> datas,String template,String outPath,List objs,Class clz,boolean isClasspath) {
ExcelTemplate et = handlerObj2Excel(template, objs, clz, isClasspath);
et.replaceFinalData(datas);
et.writeToFile(outPath);
}
/**
* 將對(duì)象轉(zhuǎn)換為Excel并且導(dǎo)出,該方法是基于模板的導(dǎo)出叉抡,導(dǎo)出到流,基于Properties作為常量數(shù)據(jù)
* @param prop 基于Properties的常量數(shù)據(jù)模型
* @param template 模板路徑
* @param os 輸出流
* @param objs 對(duì)象列表
* @param clz 對(duì)象的類型
* @param isClasspath 模板是否在classPath路徑下
*/
public void exportObj2ExcelByTemplate(Properties prop, String template, OutputStream os, List objs, Class clz, boolean isClasspath) {
ExcelTemplate et = handlerObj2Excel(template, objs, clz, isClasspath);
et.replaceFinalData(prop);
et.wirteToStream(os);
}
/**
* 將對(duì)象轉(zhuǎn)換為Excel并且導(dǎo)出尔崔,該方法是基于模板的導(dǎo)出,導(dǎo)出到一個(gè)具體的路徑中,基于Properties作為常量數(shù)據(jù)
* @param prop 基于Properties的常量數(shù)據(jù)模型
* @param template 模板路徑
* @param outPath 輸出路徑
* @param objs 對(duì)象列表
* @param clz 對(duì)象的類型
* @param isClasspath 模板是否在classPath路徑下
*/
public void exportObj2ExcelByTemplate(Properties prop,String template,String outPath,List objs,Class clz,boolean isClasspath) {
ExcelTemplate et = handlerObj2Excel(template, objs, clz, isClasspath);
et.replaceFinalData(prop);
et.writeToFile(outPath);
}
private Workbook handleObj2Excel(List objs, Class clz) {
Workbook wb = new HSSFWorkbook();
try {
Sheet sheet = wb.createSheet();
Row r = sheet.createRow(0);
List<ExcelHeader> headers = getHeaderList(clz);
Collections.sort(headers);
//寫標(biāo)題
for(int i=0;i<headers.size();i++) {
r.createCell(i).setCellValue(headers.get(i).getTitle());
}
//寫數(shù)據(jù)
Object obj = null;
for(int i=0;i<objs.size();i++) {
r = sheet.createRow(i+1);
obj = objs.get(i);
for(int j=0;j<headers.size();j++) {
r.createCell(j).setCellValue(BeanUtils.getProperty(obj, getMethodName(headers.get(j))));
}
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
return wb;
}
/**
* 導(dǎo)出對(duì)象到Excel褥民,不是基于模板的季春,直接新建一個(gè)Excel完成導(dǎo)出,基于路徑的導(dǎo)出
* @param outPath 導(dǎo)出路徑
* @param objs 對(duì)象列表
* @param clz 對(duì)象類型
*/
public void exportObj2Excel(String outPath,List objs,Class clz) {
Workbook wb = handleObj2Excel(objs, clz);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(outPath);
wb.write(fos);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(fos!=null) fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 導(dǎo)出對(duì)象到Excel消返,不是基于模板的载弄,直接新建一個(gè)Excel完成導(dǎo)出,基于流
* @param os 輸出流
* @param objs 對(duì)象列表
* @param clz 對(duì)象類型
*/
public void exportObj2Excel(OutputStream os,List objs,Class clz) {
try {
Workbook wb = handleObj2Excel(objs, clz);
wb.write(os);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 從類路徑讀取相應(yīng)的Excel文件到對(duì)象列表
* @param path 類路徑下的path
* @param clz 對(duì)象類型
* @param readLine 開始行撵颊,注意是標(biāo)題所在行
* @param tailLine 底部有多少行宇攻,在讀入對(duì)象時(shí),會(huì)減去這些行
* @return
*/
public List<Object> readExcel2ObjsByClasspath(String path,Class clz,int readLine,int tailLine) {
Workbook wb = null;
try {
wb = new HSSFWorkbook(TemplateFileUtil.getTemplates(path));
return handlerExcel2Objs(wb, clz, readLine,tailLine);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 從文件路徑讀取相應(yīng)的Excel文件到對(duì)象列表
* @param path 文件路徑下的path
* @param clz 對(duì)象類型
* @param readLine 開始行倡勇,注意是標(biāo)題所在行
* @param tailLine 底部有多少行逞刷,在讀入對(duì)象時(shí),會(huì)減去這些行
* @return
*/
public List<Object> readExcel2ObjsByPath(String path,Class clz,int readLine,int tailLine) {
Workbook wb = null;
try {
wb = new HSSFWorkbook(TemplateFileUtil.getTemplates(path));
return handlerExcel2Objs(wb, clz, readLine,tailLine);
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 從類路徑讀取相應(yīng)的Excel文件到對(duì)象列表妻熊,標(biāo)題行為0夸浅,沒有尾行
* @param path 路徑
* @param clz 類型
* @return 對(duì)象列表
*/
public List<Object> readExcel2ObjsByClasspath(String path,Class clz) {
return this.readExcel2ObjsByClasspath(path, clz, 0,0);
}
/**
* 從文件路徑讀取相應(yīng)的Excel文件到對(duì)象列表,標(biāo)題行為0扔役,沒有尾行
* @param path 路徑
* @param clz 類型
* @return 對(duì)象列表
*/
public List<Object> readExcel2ObjsByPath(String path,Class clz) {
return this.readExcel2ObjsByPath(path, clz,0,0);
}
private String getCellValue(Cell c) {
String o = null;
switch (c.getCellType()) {
case Cell.CELL_TYPE_BLANK:
o = ""; break;
case Cell.CELL_TYPE_BOOLEAN:
o = String.valueOf(c.getBooleanCellValue()); break;
case Cell.CELL_TYPE_FORMULA:
o = String.valueOf(c.getCellFormula()); break;
case Cell.CELL_TYPE_NUMERIC:
o = String.valueOf(c.getNumericCellValue()); break;
case Cell.CELL_TYPE_STRING:
o = c.getStringCellValue(); break;
default:
o = null;
break;
}
return o;
}
private List<Object> handlerExcel2Objs(Workbook wb,Class clz,int readLine,int tailLine) {
Sheet sheet = wb.getSheetAt(0);
List<Object> objs = null;
try {
Row row = sheet.getRow(readLine);
objs = new ArrayList<Object>();
Map<Integer,String> maps = getHeaderMap(row, clz);
if(maps==null||maps.size()<=0) throw new RuntimeException("要讀取的Excel的格式不正確帆喇,檢查是否設(shè)定了合適的行");
for(int i=readLine+1;i<=sheet.getLastRowNum()-tailLine;i++) {
row = sheet.getRow(i);
Object obj = clz.newInstance();
for(Cell c:row) {
int ci = c.getColumnIndex();
String mn = maps.get(ci).substring(3);
mn = mn.substring(0,1).toLowerCase()+mn.substring(1);
BeanUtils.copyProperty(obj,mn, this.getCellValue(c));
}
objs.add(obj);
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
return objs;
}
private List<ExcelHeader> getHeaderList(Class clz) {
List<ExcelHeader> headers = new ArrayList<ExcelHeader>();
Method[] ms = clz.getDeclaredMethods();
for(Method m:ms) {
String mn = m.getName();
if(mn.startsWith("get")) {
if(m.isAnnotationPresent(ExcelResources.class)) {
ExcelResources er = m.getAnnotation(ExcelResources.class);
headers.add(new ExcelHeader(er.title(),er.order(),mn));
}
}
}
return headers;
}
private Map<Integer,String> getHeaderMap(Row titleRow,Class clz) {
List<ExcelHeader> headers = getHeaderList(clz);
Map<Integer,String> maps = new HashMap<Integer, String>();
for(Cell c:titleRow) {
String title = c.getStringCellValue();
for(ExcelHeader eh:headers) {
if(eh.getTitle().equals(title.trim())) {
maps.put(c.getColumnIndex(), eh.getMethodName().replace("get","set"));
break;
}
}
}
return maps;
}
}
- Excel模板文件
創(chuàng)建一個(gè)模板文件,如下圖:
POI導(dǎo)出Excel的模板文件
- 測(cè)試類
@SpringBootTest
@RunWith(SpringRunner.class)
public class ExportExcelTest {
@Test
public void test() throws Exception {
List<WebDto> list = new ArrayList<WebDto>();
list.add(new WebDto("知識(shí)林", "http://www.zslin.com", "admin", "111111", 555));
list.add(new WebDto("權(quán)限系統(tǒng)", "http://basic.zslin.com", "admin", "111111", 111));
list.add(new WebDto("校園網(wǎng)", "http://school.zslin.com", "admin", "222222", 333));
Map<String, String> map = new HashMap<String, String>();
map.put("title", "網(wǎng)站信息表");
map.put("total", list.size()+" 條");
map.put("date", getDate());
ExcelUtil.getInstance().exportObj2ExcelByTemplate(map, "web-info-template.xls", new FileOutputStream("D:/temp/out.xls"),
list, WebDto.class, true);
}
private String getDate() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");
return sdf.format(new Date());
}
}
執(zhí)行測(cè)試方法后亿胸,查看D:/temp/out.xls
文件后可以看到如下圖的內(nèi)容:
POI導(dǎo)出Excel結(jié)果圖
示例代碼:https://github.com/zsl131/spring-boot-test/tree/master/study16
本文章來自【知識(shí)林】