在平常的开发中我们常常遇到不仅仅只是导出excel报表的情况。有时候也需要导出pdf或者CSV报 表。其实原理都差不多。刚开始本来不打算也这篇博客介绍这个的。感觉这篇博客和前面的博客有点雷同。原理基本都一样。但想了想。有时候可能有些童鞋遇到这 样的需求会无从下手。所以还是记录下来。帮助一下那些需要这个需求的童鞋。如果你对前面几篇博客的原理都搞明白了。这篇博客你完全可以不看了。仅仅只是代 码的实现不同而已。好了。下面我们来看一下需求吧。
这个图就是我们的需求
就像你看到的一样。我们的需求就是列表内容是从数据库中读出来的。而我们想把从数据库得到的这个列表导出pdf、csv、excel报表。也不多说了。看代码吧：
1 package com.bzu.csh;
2
3 import java.io.ByteArrayOutputStream;
4 import java.io.File;
5 import java.io.FileOutputStream;
6 import java.io.OutputStream;
7 import java.util.ArrayList;
8 import java.util.List;
9
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12
13 import jxl.Workbook;
14 import jxl.write.Label;
15 import jxl.write.WritableFont;
16 import jxl.write.WritableSheet;
17 import jxl.write.WritableWorkbook;
18
19 import org.apache.struts2.ServletActionContext;
20
21 import com.lowagie.text.Document;
22 import com.lowagie.text.Element;
23 import com.lowagie.text.Font;
24 import com.lowagie.text.PageSize;
25 import com.lowagie.text.Paragraph;
26 import com.lowagie.text.pdf.PdfPTable;
27 import com.lowagie.text.pdf.PdfWriter;
28 import com.opensymphony.xwork2.Action;
29
30 public class downloadAction implements Action {
31
32 private String downType;
33
34 public String getDownType() {
35 return downType;
36 }
37
38 public void setDownType(String downType) {
39 this.downType = downType;
40 }
41
42 public String execute() {
43 // TODO Auto-generated method stub
44 HttpServletRequest request = ServletActionContext.getRequest();
45 //HttpServletResponse response = ServletActionContext.getResponse();
46 //此处模拟数据库读出的数据。在真正的项目中。我们可以通过在session中保存的前端数据集合替换这里
47 List<Person> list = new ArrayList<Person>();
48 for (int i = 1; i < 6; i++) {
49 Person person = new Person();
50 person.setId(String.valueOf(i));
51 person.setName(String.valueOf((char) (i + 64)));
52 person.setAge(i + 20);
53 person.setSex("man");
54 list.add(person);
55 }
56 OutputStream os = null;
57 String fname = "personlist";
58 if ("PDF".equals(downType)) {
59 try {
60 // response.reset();
61 // os = response.getOutputStream();
62 FileOutputStream out = new FileOutputStream("d://a.pdf");
63 Document document = new Document(PageSize.A4, 50, 50, 50, 50);
64 // response.setContentType("application/pdf");
65 // response.setHeader("Content-disposition",
66 // "attachment;filename=" + fname + ".pdf");
67 ByteArrayOutputStream baos = new ByteArrayOutputStream();
68
69 PdfWriter.getInstance(document, out);
70 document.open();
71 int cols = list.size();
72 // 创建PDF表格
73 PdfPTable table = new PdfPTable(4);
74 // 设置pdf表格的宽度
75 table.setTotalWidth(500);
76 // 设置是否要固定其宽度
77 table.setLockedWidth(true);
78 // 表头字体
79 Font thfont = new Font();
80 // 设置表头字体的大小
81 thfont.setSize(7);
82 // 设置表头字体的样式
83 thfont.setStyle(Font.BOLD);
84 Font tdfont = new Font();
85 tdfont.setSize(7);
86 tdfont.setStyle(Font.NORMAL);
87 // 设置水平对齐方式
88 table.setHorizontalAlignment(Element.ALIGN_MIDDLE);
89 // 设置table的header
90 table.addCell(new Paragraph("id", thfont));
91 table.addCell(new Paragraph("name", thfont));
92 table.addCell(new Paragraph("sex", thfont));
93 table.addCell(new Paragraph("age", thfont));
94 // 循环设置table的每一行
95 for (int i = 0; i < list.size(); i++) {
96 Person p = (Person) list.get(i);
97 table.addCell(new Paragraph(p.getId(), tdfont));
98 table.addCell(new Paragraph(p.getName(), tdfont));
99 table.addCell(new Paragraph(p.getSex(), tdfont));
100 table.addCell(new Paragraph(String.valueOf(p.getAge()),
101 tdfont));
102 }
103 document.add(table);
104 document.close();
105 // baos.writeTo(response.getOutputStream());
106 baos.close();
107 } catch (Exception e) {
108 e.printStackTrace();
109 }
110 } else if ("CSV".equals(downType)) {
111 // response.reset();
112 // 生成csv文件
113 //response.setHeader("Content-disposition", "attachment;filename="
114 // + fname + ".csv");
115 //response.setContentType("text/csv");
116 //response.setCharacterEncoding("UTF-8");
117 FileOutputStream out ;
118 String sep = ",";
119 try {
120 out = new FileOutputStream(new File("d://a.cvs"));
121 //out = response.getOutputStream();
122 out.write("id".getBytes());
123 out.write(sep.getBytes());
124 out.write("name".getBytes());
125 out.write(sep.getBytes());
126 out.write("sex".getBytes());
127 out.write(sep.getBytes());
128 out.write("age".getBytes());
129 out.write(sep.getBytes());
130 out.write(System.getProperty("line.separator").getBytes());
131 for (int i = 0; i < list.size(); i++) {
132 Person p = (Person) list.get(i);
133 out.write(p.getId().getBytes());
134 out.write((sep + "/t").getBytes());
135 out.write(p.getName().getBytes());
136 out.write((sep + "/t").getBytes());
137 out.write(p.getSex().getBytes());
138 out.write((sep + "/t").getBytes());
139 out.write(String.valueOf(p.getAge()).getBytes());
140 out.write((sep + "/t").getBytes());
141 out.write(sep.getBytes());
142 out.write(System.getProperty("line.separator").getBytes());
143 }
144 out.flush();
145 //out.cloute();
146 } catch (Exception e) {
147 e.printStackTrace();
148 }
149 } else if (downType.equals("Excel")) {
150 //response.reset();
151 // 生成xls文件
152 //response.setContentType("application/vnd.ms-excel");
153 //response.setHeader("Content-disposition", "attachment;filename="
154 // + fname + ".xls");
155 try {
156 //os = response.getOutputStream();
157 Label l = null;
158 WritableWorkbook wbook = Workbook.createWorkbook(new File(
159 "d://a.xls"));
160 // 写sheet名称
161 WritableSheet sheet = wbook.createSheet("my excel file", 0);
162 jxl.write.WritableFont wfc4 = new jxl.write.WritableFont(
163 WritableFont.ARIAL, 9, WritableFont.NO_BOLD, false,
164 jxl.format.UnderlineStyle.NO_UNDERLINE,
165 jxl.format.Colour.BLACK);
166 jxl.write.WritableCellFormat wcfFC4 = new jxl.write.WritableCellFormat(
167 wfc4);
168 wcfFC4.setBackground(jxl.format.Colour.LIGHT_GREEN);
169 int col = 0;
170 sheet.setColumnView(col, 12);
171 l = new Label(col, 0, "id", wcfFC4);
172 sheet.addCell(l);
173 col++;
174 sheet.setColumnView(col, 12);
175 l = new Label(col, 0, "name", wcfFC4);
176 sheet.addCell(l);
177 col++;
178 sheet.setColumnView(col, 12);
179 l = new Label(col, 0, "sex", wcfFC4);
180 sheet.addCell(l);
181 col++;
182 sheet.setColumnView(col, 12);
183 l = new Label(col, 0, "age", wcfFC4);
184 sheet.addCell(l);
185
186 // 设置字体样式
187 jxl.write.WritableFont wfc5 = new jxl.write.WritableFont(
188 WritableFont.ARIAL, 9, WritableFont.NO_BOLD, false,
189 jxl.format.UnderlineStyle.NO_UNDERLINE,
190 jxl.format.Colour.BLACK);
191 jxl.write.WritableCellFormat wcfFC5 = new jxl.write.WritableCellFormat(
192 wfc5);
193 for (int i = 0; i < list.size(); i++) {
194 Person p = (Person) list.get(i);
195 int j = 0;
196 l = new Label(j, i + 1, p.getId(), wcfFC5);
197 sheet.addCell(l);
198 j++;
199 l = new Label(j, i + 1, p.getName(), wcfFC5);
200 sheet.addCell(l);
201 j++;
202 l = new Label(j, i + 1, p.getSex(), wcfFC5);
203 sheet.addCell(l);
204 j++;
205 l = new Label(j, i + 1, String.valueOf(p.getAge()), wcfFC5);
206 sheet.addCell(l);
207 j++;
208 }
209 // 写入流中
210 wbook.write();
211 wbook.close();
212
213 } catch (Exception e) {
214 e.printStackTrace();
215 }
216 }
217 return SUCCESS;
218 }
219 }
220
操作很简单。选择好要导出的报表格式。点击导出按钮。我们在d盘相应的位置就会生成相应的报表。
