java 如何使用 Spring MVC 返回文本文件？
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How to return a text file with Spring MVC?
提问by Mythul
@RequestMapping( method = RequestMethod.POST, value = DataController.RESOURCE_PATH + "/file", headers = "content-type=application/json" )
@ResponseBody
public void export( @RequestBody JSONObject json, HttpServletResponse response ) throws IOException
{
String myString = "Hello";
}
The string is generated inside the Controller.
What I want is to send back to the user a Window where he can save a file which contains the myString.
字符串在Controller. 我想要的是向用户发送一个窗口，他可以在其中保存包含myString.
$.ajax({
type: "POST",
url: url,
data: JSON.stringify(createJSON()),
contentType: "application/json",
success: function(response)
{
console.log("Exported JSON: " + JSON.stringify(createJSON()));
console.log(response);
},
error: function()
{
console.log(arguments);
alert("Export process failed.");
}
});
It clearly doesn't work in this current state and I am stuck at the moment.
它显然在当前状态下不起作用，我现在被卡住了。
回答by Farid
here is a sample:
这是一个示例：
@RequestMapping( method = RequestMethod.POST,
value = DataController.RESOURCE_PATH + "/file",
headers = "content-type=application/json" )
public void export( @RequestBody JSONObject json, HttpServletResponse response )
throws IOException {
String myString = "Hello";
response.setContentType("text/plain");
response.setHeader("Content-Disposition","attachment;filename=myFile.txt");
ServletOutputStream out = response.getOutputStream();
out.println(myString);
out.flush();
out.close();
}
PS: don't forget to put some random stuff in your url (as parameter for example) to ensure your browser does not cache the text file.
PS：不要忘记在您的网址中添加一些随机内容（例如作为参数）以确保您的浏览器不会缓存文本文件。
回答by Juned Ahsan
To return a file you need to use the MediaType.APPLICATION_OCTET_STREAMas the response type.
要返回文件，您需要将MediaType.APPLICATION_OCTET_STREAM用作响应类型。
回答by dwjohnston
I recommend using filesaver.js.
我建议使用filesaver.js。
Then your solution will look like:
那么您的解决方案将如下所示：
var text = JSON.stringify(createJSON());
var blob = new Blob([text], {type: "text/plain; charset=utf-8"});
saveAs(blob, "myfile.txt");
