弹出另存为窗口下载指定目录的文件
2011-09-29 13:12
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项目中要实现导出文件的功能，点导出按钮时让它弹出来一个窗口，选择存储目录和文件名
实现如下：
servlet方式
弹出来的是文件下载窗口
html代码:
java代码：
Struts1方式
弹出来的是另存为窗口
html代码：
java代码：
实现如下：
servlet方式
弹出来的是文件下载窗口
html代码:
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>Html2PdfServlet</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="http://localhost:8081/createpdf/servlet/html2PdfServlet" method="get" > <table> <tr> <td> <input type="text" id="username" name="username" value="" /> </td> <td> <input type="submit" id="submit" name="submit" value="submit" /> </td> </tr> </table> </form> </body> </html>
java代码：
package com.test;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.xhtmlrenderer.pdf.ITextFontResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;
import com.lowagie.text.pdf.BaseFont;
public class Html2PdfServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//pageContext.getServletContext().getRealPath("/")
ServletContext sc = request.getSession().getServletContext();
String path = sc.getRealPath(""); //值为D:\apache-tomcat-6.0.26\webapps\createpdf
System.out.println("原path: " + path);
//把路径中的反斜杠转成正斜杠
path = path.replaceAll("\\\\", "/"); //值为D:/apache-tomcat-6.0.26/webapps/createpdf
System.out.println(path);
String path2 = sc.getRealPath("/");
System.out.println("path2: " + path2);
System.out.println(Thread.currentThread().getContextClassLoader().getResource(""));
System.out.println("request.getRequestURI: " + request.getRequestURI());
//获取使用的端口号
System.out.println(request.getLocalPort());
String path3 = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path3+"/";
System.out.println("basepath: " + basePath);
response.setContentType("application/pdf");
//response.setHeader("Content-Disposition", "attachment; filename=WebReport.pdf");
response.setHeader("Content-Disposition", "inline; filename=WebReport.pdf");
StringBuffer html = new StringBuffer();
//组装成符合W3C标准的html文件，否则不能正确解析
html.append("<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">");
html.append("<html xmlns=\"http://www.w3.org/1999/xhtml\">")
.append("<head>")
.append("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />")
.append("<style type=\"text/css\" mce_bogus=\"1\">body {font-family: SimSun;}</style>")
.append("<style type=\"text/css\">img {width: 700px;}</style>")
.append("</head>")
.append("<body>");
html.append("<center><h1>统计报表</h1></center>");
html.append("<center>");
html.append("<img src=\"images/chart.jpg\"/>");
html.append("</center>");
html.append("</body></html>");
// parse our markup into an xml Document
try {
ITextRenderer renderer = new ITextRenderer();
/**
* 引入了新的jar包，不用再导入字体了
ITextFontResolver fontResolver = renderer.getFontResolver();
fontResolver.addFont("C:/Windows/fonts/simsun.ttc",
BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
*/
renderer.setDocumentFromString(html.toString());
// 解决图片的相对路径问题
//renderer.getSharedContext().setBaseURL("file:/C:/Documents and Settings/dashan.yin/workspace/createpdf/WebRoot/images");
//renderer.getSharedContext().setBaseURL("file:/D:/apache-tomcat-6.0.26/webapps/createpdf/images");
renderer.getSharedContext().setBaseURL("file:/" + path + "/images");
renderer.layout();
OutputStream os = response.getOutputStream();
renderer.createPDF(os);
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}Struts1方式
弹出来的是另存为窗口
html代码：
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>用户登录</title>
</head>
<body>
<h1>用户登录</h1>
<hr>
<form action="login.do" method="post">
用户：<input type="text" name="username"><br>
密码：<input type="password" name="password"><br>
<input type="submit" value="登录">
</form>
<form action="responseAction.do" method="post">
<table class="form_t" style="width:100%">
<tr>
<td>
<input type="submit" value="测试">
<input type="button" value="测试2" onclick="javascript: test(this.form);" />
<input type="button" value="导出" class="button4C"
onclick="javascript:test(this.form);" />
</td>
</tr>
</table>
</form>
<script type="text/javascript">
function test(thisform) {
thisform.submit();
}
</script>
</body>
</html>java代码：
package com.bjsxt.struts;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
public class ResponseAction extends DispatchAction {
/**
* 要想实现另存为下载必须满足的条件：
* 1.导入jar包：commons-fileupload.jar
* 2.发送请求必须以一个form表单的形式，且提交的时候必须是type="submit"(这一条也不对，也以可是type="button"),
* form的action值为相应的Action,后面不能跟方法名，跟一个form属性method="post",即：
* <form action="/responseAction.do" method="post">
<table class="form_t" style="width:100%">
<tr>
<td>
<input type="submit" id="submit" name="submit" value="提交"/>
</td>
</tr>
</table>
</form>
3.相应的Action中方法名为execute，即：(这一条不对，这跟struts配置有关)
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
*
* 现在最新总结出来：只需要满足两个条件：
* 导入jar包:commons-fileupload.jar
* 以表单提交
*
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
StringBuffer buffer = new StringBuffer("你好");
String pdfPathName = "C:/Documents and Settings/dashan.yin/workspace/webmonitor_4/WebRoot/pdf/test.pdf";
try {
OutputStream out = response.getOutputStream();
byte by[] = new byte[1024];
File fileLoad = new File(pdfPathName);
response.reset();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition",
"attachment; filename=WebReport.pdf");
long fileLength = fileLoad.length();
String length1 = String.valueOf(fileLength);
response.setHeader("Content_Length", length1);
FileInputStream in = new FileInputStream(fileLoad);
int n;
while ((n = in.read(by)) != -1) {
out.write(by, 0, n);
}
in.close();
out.flush();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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