java文件下载 带有错误提示框 弹出的

String filePath =path;
String fileName_encode = URLEncoder.encode(fileName, "UTF-8").replaceAll("[+]","%20");
byte[] data = null;
try{
data = FileOperate.getBytes(filePath);
*/
public void downloadFileByAbsolutePath(String path ,String filename,final HttpServletResponse response ,HttpServletRequest request) {
String prefixFilename = filename.substring(0,stIndexOf("."));
out.flush();
} catch (Exception e) {
String notFileHtml = FileOperate.getNotFileHtml(fileName,"文件下载出错!");
try {
response.setCharacterEncoding("UTF-8");
out.write(notFileHtml.getBytes("UTF-8"));
out.flush();
}
request.setCharacterEncoding("UTF-8");
response.reset();
if (request.getHeader("User-Agent").toLowerCase().indexOf("msie") > -1){
out.write(notFileHtml.getBytes("UTF-8"));
out.flush();
} catch (Exception e1) {
e1.printStackTrace();
logger.error("文件下载出错");
}
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName_encode + "\"");
}else{
response.setHeader("content-disposition","attachment;filename*=utf-8'zh_cn'"+fileName_encode);
String suffFilename = filename.substring(stIndexOf(".")+1,filename.length());
downloadFile(path, prefixFilename, suffFilename, response, request);
* 获取文件不存在时，的html提示 代码
* **/
public static String getNotFileHtml(String fileName,String message){
StringBuffer sb = new StringBuffer();
}
/**
* downloadFile(文件下载 ，相对项目下的路径)
* @param path 文件的路径(相对路径 /docs/abc/test.jpg)
* @param prefixFilename 文件名称
* @param suffFilename 文件名称的后缀
}
/**
* downloadFileByAbsolutePath(文件下载)
* @param path 文件的路径(绝对路径E://text.txt)
* @param filename 文件名称
* @param response
* @param request
思路：
1.用隐藏的iframe去访问下载地址实现，成功out.write("文件流")，失败out.write('div 里面有数据')
2.编写$(iframe).load()方法，处理失败的动作
代码：
页面里写：
<script type="text/javascript">
$(function(){
byte[] buffer = null;
File file = new File(filePath);
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
String suffFilename = filename.substring(stIndexOf(".")+1,filename.length());
downloadFileByAbsolutePath(path, prefixFilename, suffFilename, response, request);
}catch(FileNotFoundException e2){
response.setCharacterEncoding("UTF-8");
String notFileHtml = FileOperate.getNotFileHtml(fileName,"文件找不到!");
*/
public void downloadFile(String path ,String filename,final HttpServletResponse response ,HttpServletRequest request) {
String prefixFilename = filename.substring(0,stIndexOf("."));
* @param path 文件的路径(绝对路径E://text.txt)
* @param prefixFilename 文件名称
* @param suffFilename 文件名称的后缀
* @param response
* @param request
*/
* @param response
* @param request
*/
public void downloadFile(String path ,String prefixFilename ,String suffFilename,final HttpServletResponse response ,HttpServletRequest request) {
}
}
}件下载 ，相对项目下的路径)
* @param path 文件的路径(相对路径 /docs/abc/test.jpg)
* @param filename 文件名称
* @param response
* @param request
}
response.addHeader("Content-Length", "" + data.length);
response.setContentType("application/octet-stream;charset=UTF-8");
out.write(data);
$('#file_frame').load(function(){
fileDownloadError('file_frame');
});
});
function downloadFile(fileId){
var url= ctx+'/system/documents/downloadFile?id='+fileId;
sb.append("</div>");
sb.append("</body>");
sb.append("</html>");
return sb.toString();
}
/**
* downloadFileByAbsolutePath(文件下载)
$('#file_frame').attr('src',url);
}
</script>
<iframe id="file_frame" width="0" height="0" hidden="true" style="border: 0px;" ></iframe>
java里
/**
byte[] b = new byte[1000];
}
/**
* 获得指定文件的byte数组
* @throws FileNotFoundException