Java Export XLS Generic tool class

Java Export XLS Generic tool class

Package Org.rui. Util;import Java.io.bytearrayinputstream;import Java.io.bytearrayoutputstream;import Java.io.IOException;import Java.io.inputstream;import Java.lang.reflect.invocationtargetexception;import Java.lang.reflect.Method;import Java.text.simpledateformat;import Java.util.arraylist;import Java.util.date;import Java.util.List;import Java.util.map;import Java.util.map.entry;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.hssfrow;import Org.apache.poi.hssf.usermodel.hssfsheet;import Org.apache.poi.hssf.usermodel.hssfworkbook;import org.apache.poi.hssf.util.hssfcolor;/** * Import xls table to convert data to data stream * * * @ Author Liangrui * * encodfilenmae = Java.net.URLEncoder.encode (tablename+ ". xls", * "Utf-8"); * Response.setcontenttype ("Application/vnd.ms-excel;charset=utf-8"); * Response.setheader ("content-disposition", "Attachment;fileName= "+ * encodfilenmae); * */public Class xlsutil{/** * Convert data to output stream * * @param sheetname * Sheet name * @param header * Header map * @  PARAM list * Data set * @param clz * Object byte code * @param dateformat * If date formatted date default YYYY-MM-DD * @return * @throws Exception */@SuppressWarnings ("Rawtypes") public static InputStream Getxlsio (String sheetname,map< String, string> header, list<object> List, Class clz,string dateformat) throws Exception{hssfworkbook wb = new HS Sfworkbook (); Hssfsheet sheet = wb.createsheet (sheetname);//Set table The default column width is 15 bytes sheet.setdefaultcolumnwidth (15); Hssfrow row = sheet.createrow (0);//Fourth step, create a cell, and set the value header to set the table header centered Hssfcellstyle style = Wb.createcellstyle (); Style.setalignment (Hssfcellstyle.align_center); Create a center format//Set these styles//Style.setfillforegroundcolor (HSSFColor.CORAL.index);//back//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);//Generate a font Hssffont font = Wb.createfont (); Font.setcolor ( HSSFColor.RED.index); font.setfontheightinpoints (short); Font.setboldweight (hssffont.boldweight_bold);// Apply the font to the current style style.setfont (font); Hssfcell cell; list<string> tempsort = new arraylist<string> (); int cellindex = 0;for (entry<string, String> Es:header . EntrySet ()) {Tempsort.add (Es.getvalue ()); cell = Row.createcell (cellindex);//Create a cell and put the data Cell.setcellstyle (style ); Cell.setcelltype (hssfcell.cell_type_string);//Cell.setencoding (HSSFCELL.ENCODING_UTF_16);// Specify the Encoding Cell.setcellvalue (Es.getkey ()); Set value cellindex++;} if (list = null) {for (int i = 0; i < list.size (); ++i) {Object obj = clz.newinstance (); obj = List.get (i); row = Sheet.cr Eaterow (i + 1);//Create a row, starting from 0//based on V to find the method and get the value for (int r = 0; r < tempsort.size (); r++) {//Get the value of object value = GETMETHODVAlue (CLZ, obj, Tempsort.get (r)); String strvalue = Convertype (value, dateformat); cell = Row.createcell (r); Cell.setcellvalue (strvalue);}}} FileOutputStream fos = new FileOutputStream ("D:/tewst.xls"); Bytearrayoutputstream OS = new Bytearrayoutputstream ();//byte array output stream try{wb.write (OS);//write Byte output stream object is} catch (IOException e) { E.printstacktrace ();} Finally{if (OS! = null) {Os.close ();}} byte[] BArry = Os.tobytearray ();//Gets the byte array//writes the array bytes to the input stream object InputStream ISBA = new Bytearrayinputstream (BArry); return ISBA; }/** * Get values based on field * * @param CLZ * @param o * @param field * @return */@SuppressWarnings ("Rawtypes") public static Object get Methodvalue (Class clz, Object o, String field) throws Nosuchmethodexception, Securityexception,illegalaccessexception, Illegalargumentexception,invocationtargetexception{character Charss = Field.charat (0); field = Field.replaceFirst ( Charss.tostring (), Character.touppercase (CHARSS) + ""); System.out.println (field);//Get Value @suppresswarnings ("unchecked") Method GetMethod = Clz.getdeclareDmethod ("Get" + field, new class[] {}); Object value = Getmethod.invoke (o, new object[] {}); return value;} public static string Convertype (Object value, String dateformat) {string rresult = "";//if (value instanceof Integer)//{/ /int result = (Integer) value;//return result;////} else if (value instanceof float)//{//float result = (float) value ;//Return result;////} else if (value instanceof Double)//{//double result = (double) value;//return result;////} el  Se if (value instanceof long)//{//Long result = (long) value;//return result;//}//if (value instanceof Boolean)//{// Boolean result = (Boolean) value;//return result;////} elseif (value instanceof date) {Date date = (date) value;if ("". E Quals (DateFormat) | | NULL = = DateFormat) {DateFormat = "yyyy-mm-dd";} Illegalargumentexceptionsimpledateformat SDF = new SimpleDateFormat (dateformat); rresult = Sdf.format (date);} else if (value instanceof byte[]) {//} Else{return value + "";} return rresult;}}

Package Org.servlet;import Java.io.ioexception;import Java.io.inputstream;import java.io.outputstream;import Java.io.unsupportedencodingexception;import Java.text.simpledateformat;import Java.util.ArrayList;import Java.util.hashmap;import Java.util.list;import Java.util.map;import Javax.servlet.servletexception;import Javax.servlet.annotation.webservlet;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Org.utils.XlsUtil; Import Test. student;/** * Servlet Implementation class Expxls */@WebServlet ("/expxls") public class Expxls extends httpservlet{ Private static final Long Serialversionuid = 1l;/** * Default constructor. */public Expxls () {}protected void doget (httpservletrequest request,httpservletresponse response) throws Servletexception, Ioexception{dopost (request, response);} protected void DoPost (HttpServletRequest request,httpservletresponse response) throws Servletexception, ioexception{ String tableName= "Report name"; try{map<string, string> m = new hashmap<string, string> (), M.put ("id", "id"), m.put ("name", "name") ; M.put ("Age", "ages"), M.put ("Birthday", "birth"); list<object> list = new arraylist<object> (); SimpleDateFormat df = new SimpleDateFormat ("Yyyy-mm-dd"); Student user1 = new Student (1, "Zhang Sanhangshan Zhang 33", 16,df.parse ("1997-03-12")); Student user2 = new Student (2, "John Doe", +, Df.parse ("1996-08-12")); Student User3 = new Student (3, "Harry", +, Df.parse ("1985-11-12")); List.add (user1); List.add (User2); List.add (User3); I Nputstream is = Xlsutil.getxlsio ("Data Report", M, list, Student.class, ""); String encodfilenmae = ""; encodfilenmae = Java.net.URLEncoder.encode (tablename+ ". xls", "utf-8"); Response.setcontenttype ("Application/vnd.ms-excel;charset=utf-8"); Response.setheader ("Content-Disposition", " Attachment;filename= "+ encodfilenmae);//output stream outputstream OS = null;//bytearrayoutputstream os=null;int leng = 0;byte[] B Ytes = new byte[1024]; Cache buffertry{//Gets the output stream object//os = response.out; os=response.Getoutputstream ();//k Read while ((Leng = is.read (bytes)) > 0) {//start writing os.write (bytes, 0, Leng);}} catch (Exception e) {e.printstacktrace ();} finally{try{if (is! = null) {Is.close ();} if (OS! = null) {Os.close ();}} catch (IOException e) {e.printstacktrace ();}}} catch (Exception e) {e.printstacktrace ();}}}

Java Export XLS Generic tool class