版權(quán)聲明：yanghaha的原創(chuàng)博客 https://blog.csdn.net/qq_44758435/article/details/90636619

文件下載

需要先導(dǎo)入兩個(gè)jar包

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

String fileName = request.getParameter("fileName");

//下載文件，需要設(shè)置兩個(gè)響應(yīng)頭

//application/octet-stream任意文件類型

response.addHeader("content-Type", "application/octet-stream");

//對于不同瀏覽器進(jìn)行處理

//根據(jù)請求頭user-agent

//attachment打開對話框下載 inline直接打開

String agent = request.getHeader("User-agent");

if(agent.indexOf("Firefox")!=-1) {

response.addHeader("content-Disposition", "attachment;fileName==?UTF-8?B?"+Base64.getEncoder().encodeToString(fileName.getBytes("utf-8"))+"?=");

}else if(agent.indexOf("Edge")!=-1) {

response.addHeader("content-Disposition", "attachment;fileName="+URLEncoder.encode(fileName, "utf-8"));

}

//servlet 通過文件路徑將文件轉(zhuǎn)換為輸入流 讀到servlet中

InputStream in = getServletContext().getResourceAsStream("/res/"+fileName);

//輸出流

ServletOutputStream out = response.getOutputStream();

byte[] bt = new byte[10];

int len = -1;

//將緩沖區(qū)的讀取bt

while((len=in.read(bt))!=-1) {

//將bt里的輸出到response

out.write(bt,0,len);

}

out.close();

in.close();

文件下載名中文亂碼問題

(1).edge

response.addHeader("content-Disposition", "attachment;fileName="+URLEncoder.encode(fileName, "utf-8"));

(2).火狐

response.addHeader("content-Disposition", "attachment;fileName==?UTF-8?B?"+Base64.getEncoder().encodeToString(fileName.getBytes("utf-8"))+"?=");

(3).綜合處理

String agent = request.getHeader("User-agent");

if(agent.indexOf("Firefox")!=-1) {

response.addHeader("content-Disposition", "attachment;fileName==?UTF-8?B?"+new String(Base64.encodeBase64(fileName.getBytes("utf-8")))+"?=");

}else if(agent.indexOf("Edge")!=-1) {

response.addHeader("content-Disposition", "attachment;fileName="+URLEncoder.encode(fileName, "utf-8"));

}

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