根据url下载并重命名文件，包含以下操作：
告诉浏览器新的文件名称
使用response.setHeader方法，设置filename，为了使中文文件名称不乱码，需要加UTF-8编码，代码如下：
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| response.setHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(fileName, "UTF-8") + "\"");
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设置contentType
首先，通过FilenameUtils.getExtension获取文件后缀，再根据文件后缀设置contentType，代码中例子为下载xls或xlsx类型的文件：
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| String contentType = "xls".equals(FilenameUtils.getExtension(fileName))
? "application/vnd.ms-excel" : "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
response.setContentType(contentType);
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通过url读取网络文件的内容并下载文件
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| InputStream inputStream = new URL(filePath).openStream();
OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
try {
byte[] buffer = new byte[inputStream.available()];
int length = inputStream.read(buffer);
while (length > 0) {
outputStream.write(buffer, 0, length);
length = inputStream.read(buffer);
}
} finally {
inputStream.close();
outputStream.close();
}
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完整代码如下：
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| @RequestMapping(value = "/download", method = RequestMethod.GET)
public void downloadExcelFile(HttpServletResponse response) throws Throwable {
String filePath="";
String fileName="";
downloadFile(response, budgetTemplateUrl, fileName);
}
public void downloadFile(HttpServletResponse response, String filePath, String fileName) throws Throwable {
response.reset();
response.setHeader("Content-Disposition", "attachment; filename=\"" + URLEncoder.encode(fileName, "UTF-8") + "\"");
String contentType = "xls".equals(FilenameUtils.getExtension(fileName))
? "application/vnd.ms-excel" : "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
response.setContentType(contentType);
InputStream inputStream = new URL(filePath).openStream();
OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
try {
byte[] buffer = new byte[inputStream.available()];
int length = inputStream.read(buffer);
while (length > 0) {
outputStream.write(buffer, 0, length);
length = inputStream.read(buffer);
}
} finally {
inputStream.close();
outputStream.close();
}
}
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