利用Java将数据库中的数据导出为excel表格，导出完后可以下载，并压缩成zip格式
使用poi导出excel表，可以设置列宽、单元格合并居中、背景色设置等。
主要代码如下：
前端js代码
1 <body>
2 <button onclick="test()">导出 excel表</button>
3
4 <a id="download" href="#"> <span id="spanId" />
5 </a>
6 </body>
7 <script type="text/javascript">
8
9 function test(){
10 $.ajax({
11 //提交数据的类型 POST GET
12 type:"POST",
13 //提交的网址
14 url:"Excel.html",
15 //提交的数据
16 data:{"name":"zhangjinru"},
17 //返回数据的格式
18 datatype: "json",//"xml", "html", "script", "json", "jsonp", "text".
19 //在请求之前调用的函数
20 // beforeSend:function(){$("#msg").html("logining");},
21 //成功返回之后调用的函数
22 success:function(data){
23 $("#download").attr("href", "/download/"+data.StringUrl);
24 //自动点击
25 $("#spanId").click();
26 },
27 //调用执行后调用的函数
28 complete: function(XMLHttpRequest, textStatus){
29 },
30 //调用出错执行的函数
31 error: function(){
32 //请求出错处理
33 }
34 });
35 }
36 </script>
后台主要代码
1 package com.zhang;
2
3 import java.io.File;
4 import java.io.FileInputStream;
5 import java.io.FileNotFoundException;
6 import java.io.FileOutputStream;
7 import java.io.IOException;
8 import java.io.PrintWriter;
9 import java.sql.Connection;
10 import java.sql.PreparedStatement;
11 import java.sql.ResultSet;
12 import java.sql.ResultSetMetaData;
13 import java.util.zip.ZipEntry;
14 import java.util.zip.ZipOutputStream;
15
16 import javax.servlet.ServletException;
17 import javax.servlet.http.HttpServlet;
18 import javax.servlet.http.HttpServletRequest;
19 import javax.servlet.http.HttpServletResponse;
20
21 import org.apache.poi.ss.usermodel.Cell;
22 import org.apache.poi.ss.usermodel.CellStyle;
23 import org.apache.poi.ss.usermodel.IndexedColors;
24 import org.apache.poi.ss.usermodel.Row;
25 import org.apache.poi.ss.usermodel.Sheet;
26 import org.apache.poi.ss.util.CellRangeAddress;
27 import org.apache.poi.xssf.streaming.SXSSFSheet;
28 import org.apache.poi.xssf.streaming.SXSSFWorkbook;
29 import org.apache.poi.xssf.usermodel.XSSFRichTextString;
30
31 public class Excel extends HttpServlet {
32 /**
33 * 查询数据库中的数据，然后将其导出到Excel表中。将导出的Excel表压缩成Zip文件。
34 * 点击导出后可以将Zip文件下载到文本地。单元格可以合并，可以设置背景色和居中
35 */
36 private static final String file="D:/software/tomcat/webapps/DbToExcel/download/";
37 private static final String zipFile="D:/software/tomcat/webapps/DbToExcel/download/";
38 private static final long serialVersionUID = 1L;
39
40 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
41 doPost(request,response);
42 }
43
44 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
45 System.out.println(request.getParameter("name"));
46
47 response.setHeader("Access-Control-Allow-Origin", "*");
48 response.setHeader("Access-Control-Allow-Methods", "*");
49 response.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
50 response.setCharacterEncoding("utf-8");
51 //response.setContentType("text/html;charset=utf-8");
52 response.setContentType("application/json;charset=utf-8");
53
54 //得到数据库连接
55 Connection conn=DBUtil.getConnection();
56 String sql="SELECT id AS id ,username AS 用户名 ,birthday AS 生日,sex AS 性别,address AS 地址 FROM TEST";
57 PreparedStatement pstmt;
58 try {
59 pstmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY,ResultSet.CONCUR_READ_ONLY);
60 //设置每次只读取一部分数据
61 pstmt.setFetchSize(1000);
62 pstmt.setFetchDirection(ResultSet.FETCH_REVERSE);
63 ResultSet rs = pstmt.executeQuery();
64
65 //一旦这个Workbook中数据量超过1000就会写入到磁盘中
66 SXSSFWorkbook workbook = new SXSSFWorkbook(1000);
67 Sheet sheet = (Sheet) workbook.createSheet();
68 //设置宽度 sheet.setColumnWidth(m, “列名”.getBytes().length*2*256);
69 sheet.setColumnWidth(0, 1000);
70 sheet.setColumnWidth(1, 2000);
71 sheet.setColumnWidth(2, 3000);
72 sheet.setColumnWidth(3, 1000);
73 sheet.setColumnWidth(4, 4000);
74 workbook.setSheetName(0, "sheet1");
75 Row row = sheet.createRow((short) 0);
76 Cell cell;
77 CellStyle cellStyle;
78 //单元格合并
79 sheet.addMergedRegion(new CellRangeAddress( 0, 0, 0, 4));//参数1：行号 参数2：起始列号 参数3：行号 参数4：终止列号
80 cell = row.createCell((short) 0);
81 cell.setCellType(Cell.CELL_TYPE_STRING);
82 cell.setCellValue(new XSSFRichTextString("数据流向"));
83 //设置背景色
84 cellStyle=workbook.createCellStyle();
85 cellStyle.setFillForegroundColor(IndexedColors.CORAL.getIndex());
86 cellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
87
88 cellStyle.setAlignment(CellStyle.ALIGN_CENTER); // 水平居中
89 // cellStyle.setAlignment(CellStyle.VERTICAL_CENTER); // 垂直居中
90 cell.setCellStyle(cellStyle);
91
92 /*
93 cellStyle.setBorderRight(CellStyle.BORDER_THIN);//右边框
94 cellStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN); //下边框
95 cellStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);//左边框
96 cellStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);//上边框
97 */
98
99 //获取有多少列
100 ResultSetMetaData md = rs.getMetaData();
101 int nColumn = md.getColumnCount();
102 row = sheet.createRow(1);
103 cellStyle=workbook.createCellStyle();
104 for (int i = 1; i <= nColumn; i++) {
105 cell = row.createCell((short) (i-1));
106 //设置数据类型Cell.CELL_TYPE_STRING Cell.CELL_TYPE_NUMERIC Cell.CELL_TYPE_FORMULA Cell.CELL_TYPE_BOOLEAN Cell.CELL_TYPE_BLANK Cell.CELL_TYPE_ERROR
107 cell.setCellType(Cell.CELL_TYPE_STRING);
108 //设置值
109 cell.setCellValue(new XSSFRichTextString(md.getColumnLabel(i)));
110 //设置背景色
111 cellStyle.setFillForegroundColor(IndexedColors.BLUE.getIndex());
112 cellStyle.setFillPattern(CellStyle.SOLID_FOREGROUND);
113 cellStyle.setAlignment(CellStyle.ALIGN_CENTER); // 水平居中
114 cell.setCellStyle(cellStyle);
115 }
116
117 int iRow = 2;
118 while (rs.next()) {
119 row = sheet.createRow(iRow);
120 for (int j = 1; j <= nColumn; j++) {
121 cell = row.createCell((short) (j - 1));
122 cell.setCellType(Cell.CELL_TYPE_STRING);
123 if (rs.getObject(j) != null) {
124 cell.setCellValue(new XSSFRichTextString(rs.getObject(j).toString()));
125 } else {
126 cell.setCellValue("");
127 }
128 }
129 //每1000行将数据存入硬盘
130 if (iRow % 1000 == 0) {
131 ((SXSSFSheet) sheet).flushRows();
132 }
133 iRow++;
134 }
135
136 String filename=System.currentTimeMillis()+".xlsx";
137 String savefile=file+filename;
138 String zipfilename=System.currentTimeMillis()+".zip";
139 String zipsavefile=zipFile+zipfilename;
140 FileOutputStream fOut = new FileOutputStream(savefile);
141 workbook.write(fOut);
142 fOut.flush();
143 fOut.close();
144
145 //将文件转换成Zip文件
146 FiletoZip(savefile, zipsavefile);
147
148 //将下载路径返回给前端
149 PrintWriter out = response.getWriter();
150 out.write("{\"StringUrl\":\""+zipfilename+"\"}");
151 out.close();
152 } catch (Exception e) {
153 e.printStackTrace();
154 }
155
156 }
157
158 /**
159 * 将文件压缩成zip文件
160 * @param file 文件路径
161 * @param zipFile 压缩后的文件路径
162 * @throws IOException
163 * @throws FileNotFoundException
164 */
165 private void FiletoZip(String file, String zipFile) throws IOException,FileNotFoundException {
166 File f = new File(file);
167 File ff = new File(zipFile);
168 if (!f.exists()) {
169 ff.createNewFile();
170 }
171 FileInputStream in = new FileInputStream(file);
172 FileOutputStream out = new FileOutputStream(zipFile);
173 ZipOutputStream zipOut = new ZipOutputStream(out);
174 String fileName = file.substring(file.lastIndexOf(‘/‘) + 1, file.length());
175 // 创建指向压缩原始文件的入流
176 ZipEntry entry = new ZipEntry(fileName);
177 zipOut.putNextEntry(entry);
178 // 向压缩文件中输出数据
179 int number = 0;
180 byte[] buffer = new byte[512];
181 while ((number = in.read(buffer)) != -1) {
182 zipOut.write(buffer, 0, number);
183 }
184 zipOut.close();
185 out.close();
186 in.close();
187
188 // f.delete();
189 }
190
191 /**
192 * 设置跨越
193 */
194 @Override
195 protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
196 resp.setHeader("Access-Control-Allow-Credentials", "false");
197 resp.setHeader("Access-Control-Allow-Origin", "*");
198 resp.setHeader("Access-Control-Allow-Methods", "*");
199 resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type");
200 resp.setContentType("application/json");
201 resp.setCharacterEncoding("utf-8");
202 super.doOptions(req, resp);
203 }
204 }
注意：如果数据超过1048575条会报下面的错误
本项目使用的jar包和源码下载链接：http://download.csdn.net/detail/u013865056/9908167
时间： 2024-10-07 06:42:29