POI框架是Apache开源的可以导出导入Excel表的,本博客介绍在SSM(Spring+SpringMVC+Mybatis)项目里,如何使用POI框架,导出Excel表
这里我们先要去Apache官网下载jar
然后,就可以先编程了
先提供一个封装的httpservlet请求和添加数据的类
[java] view plain copy public class PageData extends HashMap implements Map{ private static final long serialVersionUID = 1L; Map map = null; HttpServletRequest request; public PageData(HttpServletRequest request){ this.request = request; Map properties = request.getParameterMap(); Map returnMap = new HashMap(); Iterator entries = properties.entrySet().iterator(); Map.Entry entry; String name = ""; String value = ""; while (entries.hasNext()) { entry = (Map.Entry) entries.next(); name = (String) entry.getKey(); Object valueObj = entry.getValue(); if(null == valueObj){ value = ""; }else if(valueObj instanceof String[]){ String[] values = (String[])valueObj; for(int i=0;i<values.length;i++){ value = values[i] + ","; } value = value.substring(0, value.length()-1); }else{ value = valueObj.toString(); } returnMap.put(name, value); } map = returnMap; } public PageData() { map = new HashMap(); } @Override public Object get(Object key) { Object obj = null; if(map.get(key) instanceof Object[]) { Object[] arr = (Object[])map.get(key); obj = request == null ? arr:(request.getParameter((String)key) == null ? arr:arr[0]); } else { obj = map.get(key); } return obj; } public String getString(Object key) { return (String)get(key); } @SuppressWarnings("unchecked") @Override public Object put(Object key, Object value) { return map.put(key, value); } @Override public Object remove(Object key) { return map.remove(key); } public void clear() { map.clear(); } public boolean containsKey(Object key) { // TODO Auto-generated method stub return map.containsKey(key); } public boolean containsValue(Object value) { // TODO Auto-generated method stub return map.containsValue(value); } public Set entrySet() { // TODO Auto-generated method stub return map.entrySet(); } public boolean isEmpty() { // TODO Auto-generated method stub return map.isEmpty(); } public Set keySet() { // TODO Auto-generated method stub return map.keySet(); } @SuppressWarnings("unchecked") public void putAll(Map t) { // TODO Auto-generated method stub map.putAll(t); } public int size() { // TODO Auto-generated method stub return map.size(); } public Collection values() { // TODO Auto-generated method stub return map.values(); } }
写个实体类:
会员类
[java] view plain copy public class Member { /** * 会员账号 */ private String memberID; /** * 会员密码 */ private String password; /** * 会员级别 */ private String rank; /** * 会员积分 */ private int credit; /** * 会员手机号 */ private String phone; /** * 会员皮肤 */ private String imgPath; private List<GroupPost> postes; public List<GroupPost> getPostes() { return postes; } public void setPostes(List<GroupPost> postes) { this.postes = postes; } public String getMemberID() { return memberID; } public void setMemberID(String memberID) { this.memberID = memberID; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getRank() { return rank; } public void setRank(String rank) { this.rank = rank; } public int getCredit() { return credit; } public void setCredit(int credit) { this.credit = credit; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getImgPath() { return imgPath; } public void setImgPath(String imgPath) { this.imgPath = imgPath; } }
DAO.java
[java] view plain copy package com.appweb.core.dao; public interface DAO { /** * 保存对象 * @param str * @param obj * @return * @throws Exception */ public Object save(String str, Object obj) throws Exception; /** * 修改对象 * @param str * @param obj * @return * @throws Exception */ public Object update(String str, Object obj) throws Exception; /** * 删除对象 * @param str * @param obj * @return * @throws Exception */ public Object delete(String str, Object obj) throws Exception; /** * 查找对象 * @param str * @param obj * @return * @throws Exception */ public Object findForObject(String str, Object obj) throws Exception; /** * 查找对象 * @param str * @param obj * @return * @throws Exception */ public Object findForList(String str, Object obj) throws Exception; /** * 查找对象封装成Map * @param s * @param obj * @return * @throws Exception */ public Object findForMap(String sql, Object obj, String key , String value) throws Exception; } DAOSupport类:[java] view plain copy package com.appweb.core.dao; import java.util.List; import javax.annotation.Resource; import org.apache.ibatis.session.ExecutorType; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.mybatis.spring.SqlSessionTemplate; import org.springframework.stereotype.Repository; @Repository("daoSupport") public class DaoSupport implements DAO { @Resource(name = "sqlSessionTemplate") private SqlSessionTemplate sqlSessionTemplate; /** * 保存对象 * @param str * @param obj * @return * @throws Exception */ public Object save(String str, Object obj) throws Exception { return sqlSessionTemplate.insert(str, obj); } /** * 批量更新 * @param str * @param obj * @return * @throws Exception */ public Object batchSave(String str, List objs )throws Exception{ return sqlSessionTemplate.insert(str, objs); } /** * 修改对象 * @param str * @param obj * @return * @throws Exception */ public Object update(String str, Object obj) throws Exception { return sqlSessionTemplate.update(str, obj); } /** * 批量更新 * @param str * @param obj * @return * @throws Exception */ public void batchUpdate(String str, List objs )throws Exception{ SqlSessionFactory sqlSessionFactory = sqlSessionTemplate.getSqlSessionFactory(); //批量执行器 SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,false); try{ if(objs!=null){ for(int i=0,size=objs.size();i<size;i++){ sqlSession.update(str, objs.get(i)); } sqlSession.flushStatements(); sqlSession.commit(); sqlSession.clearCache(); } }finally{ sqlSession.close(); } } /** * 批量更新 * @param str * @param obj * @return * @throws Exception */ public Object batchDelete(String str, List objs )throws Exception{ return sqlSessionTemplate.delete(str, objs); } /** * 删除对象 * @param str * @param obj * @return * @throws Exception */ public Object delete(String str, Object obj) throws Exception { return sqlSessionTemplate.delete(str, obj); } /** * 查找对象 * @param str * @param obj * @return * @throws Exception */ public Object findForObject(String str, Object obj) throws Exception { return sqlSessionTemplate.selectOne(str, obj); } /** * 查找对象 * @param str * @param obj * @return * @throws Exception */ public Object findForList(String str, Object obj) throws Exception { return sqlSessionTemplate.selectList(str, obj); } public Object findForMap(String str, Object obj, String key, String value) throws Exception { return sqlSessionTemplate.selectMap(str, obj, key); } }
写个Service类:
[java] view plain copy /** * 会员信息列表 * @param pd * @return * @throws Exception */ public List<PageData> listM(PageData pd)throws Exception{ return (List<PageData>)dao.findForList("MemberMapper.memberList", pd); }
ObjectExcelView.java:
[java] view plain copy package com.appweb.core.view; import java.util.Date; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.springframework.web.servlet.view.document.AbstractExcelView; import com.appweb.core.entity.PageData; import com.appweb.core.utils.Tools; /** * 导入到EXCEL * 类名称:ObjectExcelView.java * 类描述: */ public class ObjectExcelView extends AbstractExcelView{ @Override protected void buildExcelDocument(Map<String, Object> model, HSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception { // TODO Auto-generated method stub Date date = new Date(); String filename = Tools.date2Str(date, "yyyyMMddHHmmss"); HSSFSheet sheet; HSSFCell cell; response.setContentType("application/octet-stream"); response.setHeader("Content-Disposition", "attachment;filename="+filename+".xls"); sheet = workbook.createSheet("sheet1"); List<String> titles = (List<String>) model.get("titles"); int len = titles.size(); HSSFCellStyle headerStyle = workbook.createCellStyle(); //标题样式 headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); headerStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); HSSFFont headerFont = workbook.createFont(); //标题字体 headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); headerFont.setFontHeightInPoints((short)11); headerStyle.setFont(headerFont); short width = 20,height=25*20; sheet.setDefaultColumnWidth(width); for(int i=0; i<len; i++){ //设置标题 String title = titles.get(i); cell = getCell(sheet, 0, i); cell.setCellStyle(headerStyle); setText(cell,title); } sheet.getRow(0).setHeight(height); HSSFCellStyle contentStyle = workbook.createCellStyle(); //内容样式 contentStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER); List<PageData> varList = (List<PageData>) model.get("varList"); int varCount = varList.size(); for(int i=0; i<varCount; i++){ PageData vpd = varList.get(i); for(int j=0;j<len;j++){ String varstr = vpd.getString("var"+(j+1)) != null ? vpd.getString("var"+(j+1)) : ""; cell = getCell(sheet, i+1, j); cell.setCellStyle(contentStyle); setText(cell,varstr); } } } } 控制类导出Excel表:
[java] view plain copy /** * 导出Excel * @return * @throws Exception */ @RequestMapping("/exportExcel") public ModelAndView exportExcel()throws Exception{ ModelAndView mv = this.getModelAndView(); PageData pd = new PageData(); pd = this.getPageData(); //检索条件 Map<String,Object> dataMap = new HashMap<String,Object>(); List<String> titles = new ArrayList<String>(); titles.add("用户名"); titles.add("密码"); titles.add("级别"); titles.add("积分"); titles.add("手机号"); dataMap.put("titles", titles); List<PageData> memberList = memberService.listM(pd); List<PageData> varList = new ArrayList<PageData>(); for(int i=0;i<memberList.size();i++){ PageData vpd = new PageData(); vpd.put("var1", memberList.get(i).getString("memberID")); vpd.put("var2", memberList.get(i).getString("password")); vpd.put("var3", memberList.get(i).getString("rank")); vpd.put("var4", memberList.get(i).get("credit").toString()); vpd.put("var5", memberList.get(i).getString("phone")); varList.add(vpd); } dataMap.put("varList", varList); ObjectExcelView erv = new ObjectExcelView(); mv = new ModelAndView(erv,dataMap); return mv; }