JSF实现在动态表格中下载文件(支持中文文件名)
笔者在最近的项目中遇到动态表格中下载文件的问题,以下是测试的小例子,支持下载中文名的文件.
一 页面test.jsp
1
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
2<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
3<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
4<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
5
<html>
6<head>
7<title>文件列示</title>
8</head>
9<body>
10<f:view>
11<h:form>
12 <t:panelGrid>
13
14 <t:panelGroup>
15 <!-- this is table -->
16 <t:dataTable id="data" value="#{fileBean.contentList}" var="result" border="1" width="100%" rows="10">
17
18 <t:column rendered="true">
19 <f:facet name="header">
20 <t:outputText value="编号" />
21 </f:facet>
22 <t:outputText value="#{result.number}" />
23 </t:column>
24
25 <t:column rendered="true">
26 <f:facet name="header">
27 <t:outputText value="名称" />
28 </f:facet>
29 <t:outputText value="#{result.name}" />
30 </t:column>
31
32 <t:column rendered="true">
33 <f:facet name="header">
34 <t:outputText value="大小" />
35 </f:facet>
36 <t:outputText value="#{result.size}" />
37 </t:column>
38
39 <t:column rendered="true">
40 <f:facet name="header">
41 <t:outputText value="操作" />
42 </f:facet>
43 <t:commandButton value="下載" actionListener="#{fileBean.downloadFile}" />
44 </t:column>
45 </t:dataTable>
46
47 </t:panelGroup>
48 </t:panelGrid>
49</h:form>
50</f:view>
51</body>
52</html>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
2
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>3
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>4
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>5
<html>6
<head>7
<title>文件列示</title>8
</head>9
<body>10
<f:view>11
<h:form>12
<t:panelGrid>13
14
<t:panelGroup>15
<!-- this is table -->16
<t:dataTable id="data" value="#{fileBean.contentList}" var="result" border="1" width="100%" rows="10">17
18
<t:column rendered="true">19
<f:facet name="header">20
<t:outputText value="编号" />21
</f:facet>22
<t:outputText value="#{result.number}" />23
</t:column>24
25
<t:column rendered="true">26
<f:facet name="header">27
<t:outputText value="名称" />28
</f:facet>29
<t:outputText value="#{result.name}" />30
</t:column>31
32
<t:column rendered="true">33
<f:facet name="header">34
<t:outputText value="大小" />35
</f:facet>36
<t:outputText value="#{result.size}" />37
</t:column>38
39
<t:column rendered="true">40
<f:facet name="header">41
<t:outputText value="操作" />42
</f:facet>43
<t:commandButton value="下載" actionListener="#{fileBean.downloadFile}" />44
</t:column>45
</t:dataTable>46
47
</t:panelGroup>48
</t:panelGrid>49
</h:form>50
</f:view>51
</body>52
</html>
二 MyFile.java
1package com.jakin;
2
3public class MyFile {
4
private String number;
5 private String name;
6 private String size;
7
8
public MyFile(String number, String name, String size) {
9 super();
10 this.number = number;
11 this.name = name;
12 this.size = size;
13
}
14
15 public String getNumber() {
16 return number;
17 }
18
19 public void setNumber(String number) {
20 this.number = number;
21 }
22
23 public String getName() {
24 return name;
25 }
26
27 public void setName(String name) {
28 this.name = name;
29 }
30
31 public String getSize() {
32 return size;
33 }
34
35 public void setSize(String size) {
36 this.size = size;
37 }
38
}
39
package com.jakin;2
3
public class MyFile {4
private String number;5
private String name;6
private String size;7
8
public MyFile(String number, String name, String size) {
9
super();10
this.number = number;11
this.name = name;12
this.size = size;13
}14
15
public String getNumber() {16
return number;17
}18
19
public void setNumber(String number) {20
this.number = number;21
}22
23
public String getName() {24
return name;25
}26
27
public void setName(String name) {28
this.name = name;29
}30
31
public String getSize() {32
return size;33
}34
35
public void setSize(String size) {36
this.size = size;37
}38
}39
三,JSF中的bean:FileBean
1package com.jakin;
2
3import java.io.File;
4import java.io.FileInputStream;
5import java.io.IOException;
6import java.util.ArrayList;
7import java.util.List;
8
9import javax.faces.component.UIColumn;
10import javax.faces.component.UIComponent;
11import javax.faces.component.html.HtmlDataTable;
12import javax.faces.context.FacesContext;
13import javax.faces.event.ActionEvent;
14import javax.servlet.ServletOutputStream;
15import javax.servlet.http.HttpServletResponse;
16
17public class FileBean {
18 private List<MyFile> contentList; // 存放文件的集合
19
20 public List<MyFile> getContentList() {
21 contentList = new ArrayList<MyFile>();
22 for (int i = 0; i < 5; i++) {
23 MyFile myFile = new MyFile(i + "", i + ".txt", "100K");
24 contentList.add(myFile);
25 }
26 return contentList;
27 }
28
29 public void setContentList(List<MyFile> contentList) {
30 this.contentList = contentList;
31 }
32
33 public void downloadFile(ActionEvent e) {
34 UIComponent component = (UIComponent) e.getSource();
35 UIColumn column = (UIColumn) component.getParent();
36 HtmlDataTable dataTable = (HtmlDataTable) column.getParent();
37 int listIndex = dataTable.getRowIndex();
38 MyFile myFile = (MyFile) contentList.get(listIndex);
39 String name = myFile.getName();
40 // String name = "轻松搞定XML.pdf";
41
42 try {
43 File file = new File("D:\\project\\UploadFile\\" + name);
44 HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext
45 .getCurrentInstance().getExternalContext().getResponse();
46 ServletOutputStream servletOutputStream = httpServletResponse
47 .getOutputStream();
48
49 name = java.net.URLEncoder.encode(name, "UTF-8");
50 httpServletResponse.setHeader("Content-disposition",
51 "attachment; filename=\"" + name + "\"");
52 httpServletResponse.setContentLength((int) file.length());
53 httpServletResponse
54 .setContentType("application/x-download;charset=UTF-8");
55
56 byte[] b = new byte[1024];
57 int i = 0;
58 FileInputStream fis = new java.io.FileInputStream(file);
59 while ((i = fis.read(b)) > 0) {
60 servletOutputStream.write(b, 0, i);
61 }
62 } catch (IOException ioe) {
63 ioe.printStackTrace();
64 }
65 FacesContext.getCurrentInstance().responseComplete();
66 }
67
68}
package com.jakin;2
3
import java.io.File;4
import java.io.FileInputStream;5
import java.io.IOException;6
import java.util.ArrayList;7
import java.util.List;8
9
import javax.faces.component.UIColumn;10
import javax.faces.component.UIComponent;11
import javax.faces.component.html.HtmlDataTable;12
import javax.faces.context.FacesContext;13
import javax.faces.event.ActionEvent;14
import javax.servlet.ServletOutputStream;15
import javax.servlet.http.HttpServletResponse;16
17
public class FileBean {18
private List<MyFile> contentList; // 存放文件的集合19
20
public List<MyFile> getContentList() {21
contentList = new ArrayList<MyFile>();22
for (int i = 0; i < 5; i++) {23
MyFile myFile = new MyFile(i + "", i + ".txt", "100K");24
contentList.add(myFile);25
}26
return contentList;27
}28
29
public void setContentList(List<MyFile> contentList) {30
this.contentList = contentList;31
}32
33
public void downloadFile(ActionEvent e) {34
UIComponent component = (UIComponent) e.getSource();35
UIColumn column = (UIColumn) component.getParent();36
HtmlDataTable dataTable = (HtmlDataTable) column.getParent();37
int listIndex = dataTable.getRowIndex();38
MyFile myFile = (MyFile) contentList.get(listIndex);39
String name = myFile.getName();40
// String name = "轻松搞定XML.pdf";41
42
try {43
File file = new File("D:\\project\\UploadFile\\" + name);44
HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext45
.getCurrentInstance().getExternalContext().getResponse();46
ServletOutputStream servletOutputStream = httpServletResponse47
.getOutputStream();48
49
name = java.net.URLEncoder.encode(name, "UTF-8");50
httpServletResponse.setHeader("Content-disposition",51
"attachment; filename=\"" + name + "\"");52
httpServletResponse.setContentLength((int) file.length());53
httpServletResponse54
.setContentType("application/x-download;charset=UTF-8");55
56
byte[] b = new byte[1024];57
int i = 0;58
FileInputStream fis = new java.io.FileInputStream(file);59
while ((i = fis.read(b)) > 0) {60
servletOutputStream.write(b, 0, i);61
}62
} catch (IOException ioe) {63
ioe.printStackTrace();64
}65
FacesContext.getCurrentInstance().responseComplete();66
}67
68
}
