1. Create new JSF bean, either ManageBean or Component Bean using Spring framework
1: package com.jsf.app.managedbean;
2: import java.io.BufferedInputStream;
3: import java.io.BufferedOutputStream;
4: import java.io.File;
5: import java.io.FileInputStream;
6: import java.io.IOException;
7: import javax.faces.context.FacesContext;
8: import javax.servlet.http.HttpServletResponse;
9: import javax.faces.bean.ManagedBean;
10: @ManagedBean(name="fileDownloadBean")
11: public class FileDownloadBean {
12: private static final int DEFAULT_BUFFER_SIZE = 10240;
13: private String filePath = "c:\\download\\test.txt";
14: public void downLoad() throws IOException {
15: FacesContext context = FacesContext.getCurrentInstance();
16: HttpServletResponse response = (HttpServletResponse) context
17: .getExternalContext().getResponse();
18: File file = new File(filePath);
19: if (!file.exists()) {
20: response.sendError(HttpServletResponse.SC_NOT_FOUND);
21: return;
22: }
23: response.reset();
24: response.setBufferSize(DEFAULT_BUFFER_SIZE);
25: response.setContentType("application/octet-stream");
26: response.setHeader("Content-Length", String.valueOf(file.length()));
27: response.setHeader("Content-Disposition", "attachment;filename=\""
28: + file.getName() + "\"");
29: BufferedInputStream input = null;
30: BufferedOutputStream output = null;
31: try {
32: input = new BufferedInputStream(new FileInputStream(file),
33: DEFAULT_BUFFER_SIZE);
34: output = new BufferedOutputStream(response.getOutputStream(),
35: DEFAULT_BUFFER_SIZE);
36: byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
37: int length;
38: while ((length = input.read(buffer)) > 0) {
39: output.write(buffer, 0, length);
40: }
41: } finally {
42: input.close();
43: output.close();
44: }
45: context.responseComplete();
46: }
47: }
2. Now Access the file using the JSF link as shown below:
1: <h:form>
2: <h:commandLink id="getDownload" value="Download Files"
3: action="#{fileDownloadBean.downLoad}">
4: </h:commandLink>
5: </h:form>
3. Create web.xml something like:
1: <?xml version="1.0" encoding="UTF-8"?>
2: <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3: xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
4: xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
5: http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
6: id="WebApp_ID" version="2.5">
7: <listener>
8: <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
9: </listener>
10: <context-param>
11: <param-name>javax.faces.PROJECT_STAGE</param-name>
12: <param-value>Development</param-value>
13: </context-param>
14: <context-param>
15: <param-name>javax.faces.CONFIG-FILES</param-name>
16: <param-value>WEB-INF/faces-config.xml</param-value>
17: </context-param>
18: <context-param>
19: <param-name>com.sun.faces.expressionFactory</param-name>
20: <param-value>com.sun.el.ExpressionFactoryImpl</param-value>
21: </context-param>
22: <servlet>
23: <servlet-name>Faces Servlet</servlet-name>
24: <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
25: <load-on-startup>1</load-on-startup>
26: </servlet>
27: <servlet-mapping>
28: <servlet-name>Faces Servlet</servlet-name>
29: <url-pattern>/faces/*</url-pattern>
30: </servlet-mapping>
31: <servlet-mapping>
32: <servlet-name>Faces Servlet</servlet-name>
33: <url-pattern>*.jsf</url-pattern>
34: </servlet-mapping>
35: <servlet-mapping>
36: <servlet-name>Faces Servlet</servlet-name>
37: <url-pattern>*.faces</url-pattern>
38: </servlet-mapping>
39: <servlet-mapping>
40: <servlet-name>Faces Servlet</servlet-name>
41: <url-pattern>*.xhtml</url-pattern>
42: </servlet-mapping>
43: </web-app>
Now after deploying this in the servlets container, you will see the dialog box for Save the File/Open.
