我正在使用AngularJS和Spring编写应用程序。我想向服务器发送请求并下载从控制器返回的响应作为文件。在控制器中,我有csv文件的内容(作为字符串),即1;2;3;4
(1行,4列)。将此响应作为文件下载的最简单方法是什么?
下面,我发布了简化代码。 在Spring控制器中:
@RequestMapping(value = "/csv", method = GET)
@ResponseBody
public String getCsvFile() {
return getCsvContent();
}
在javascript(AngularJS)
中return $http({method: 'GET', url: 'csv/'});
我也试图写入响应流(下面),设置标题,但在客户端我总是把这个内容作为字符串 - 而不是要下载的文件。
@RequestMapping(value = "/csv", method = GET)
@ResponseBody
public void getCsvFile(HttpServletResponse response) {
response.setContentType("application/csv");
response.setHeader("Content-Disposition", "attachment; filename=file.csv");
response.setContentLength(getCsvContent().getBytes().length);
ServletOutputStream out = response.getOutputStream();
out.write(getCsvContent());
out.flush();
out.close();
}
有没有人知道如何正确编写控制器的方法,以便将响应作为文件下载到客户端?
答案 0 :(得分:25)
您无法通过XHR请求下载文件(这是Angular提出请求的方式)。请参阅Why threre is no way to download file using ajax request?您需要通过$window.open
转到该网址,或执行此处显示的iframe技巧:JavaScript/jQuery to download file via POST with JSON data
答案 1 :(得分:8)
我自己也在努力解决这个问题,试图让它从服务器上运行。不能。代替...
为了澄清@ dnc253的答案,$window.open(URL)
是让Angular应用程序在另一个窗口中打开给定URL的方法。 (它实际上只是通用window.open()
的可测试角度代理。)这是一个很好的解决方案,保留您的历史记录,并获取文件下载,如果支持,可能会在新的浏览器窗口中呈现它。但它经常遇到弹出窗口拦截器,这对可靠性来说是一个巨大的问题。用户通常根本不理解他们正在发生什么。因此,如果您不介意立即使用当前窗口下载文件,您可以使用同样有效的通用JavaScript方法:location.href = "uriString"
,这对我来说就像一个魅力。 Angular甚至没有意识到发生过任何事情。一旦我的POST / PUT操作完成,我就在一个promise处理程序中调用它。如果需要,让POST / PUT返回要调用的URL,如果你还不能推断它。您将获得与用户相同的行为,就像它为响应PUT / POST而下载一样。例如:
$http.post(url, payload).then(function(returnData){
var uriString = parseReturn(returnData);
location.href="uriString"
})
事实上,您可以直接从XHR请求下载内容,但它需要完全支持HTML5文件API,除非您需要在文件之前对文件执行本地转换,否则通常会比它的价值更麻烦。使其可供用户使用。 (遗憾的是,我没有时间提供详细信息,但还有其他关于使用它的SO帖子。)
答案 2 :(得分:3)
可以使用XHR请求下载文件。您可以使用angular $ http加载文件,然后使用HTML5的Blob功能使浏览器保存它。有一个图书馆可以帮助您保存:FileSaver.js。
答案 3 :(得分:2)
万一你们需要它, 这里有几个可以帮到你的链接:
答案 4 :(得分:1)
我在下面写了评论来理解代码示例。有人如果使用,他们可以关注它,因为我相应地命名了文件。
如果服务器在响应中发送blob,那么我们的客户端应该能够生成它。
我的目的是通过使用这些来解决的。我可以下载文件,因为我使用了类型:'application / *'表示所有文件。
创建的“downloadLink”变量只是在响应中使用的技术,因此,它会像点击链接一样填充,然后响应,然后触发其href。
controller.js
//this function is in controller, which will be trigered on download button hit.
$scope.downloadSampleFile = function() {
//create sample hidden link in document, to accept Blob returned in the response from back end
var downloadLink = document.createElement("a");
document.body.appendChild(downloadLink);
downloadLink.style = "display: none";
//This service is written Below how does it work, by aceepting necessary params
downloadFile.downloadfile(data).then(function (result) {
var fName = result.filename;
var file = new Blob([result.data], {type: 'application/*'});
var fileURL = (window.URL || window.webkitURL).createObjectURL(file);
//Blob, client side object created to with holding browser specific download popup, on the URL created with the help of window obj.
downloadLink.href = fileURL;
downloadLink.download = fName;
downloadLink.click();
});
};
services.js
.factory('downloadFile', ["$http", function ($http) {
return {
downloadfile : function () {
return $http.get(//here server endpoint to which you want to hit the request
, {
responseType: 'arraybuffer',
params: {
//Required params
},
}).then(function (response, status, headers, config) {
return response;
});
},
};
}])
答案 5 :(得分:0)
它为我工作:
Spring控制器:DownloadController.java
package com.mycompany.myapp.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.mycompany.myapp.exception.TechnicalException;
@RestController
public class DownloadController {
private final Logger log = LoggerFactory.getLogger(DownloadController.class);
@RequestMapping(value = "/download", method = RequestMethod.GET)
public void download(@RequestParam ("name") String name, final HttpServletRequest request, final HttpServletResponse response) throws TechnicalException {
log.trace("name : {}", name);
File file = new File ("src/main/resources/" + name);
log.trace("Write response...");
try (InputStream fileInputStream = new FileInputStream(file);
OutputStream output = response.getOutputStream();) {
response.reset();
response.setContentType("application/octet-stream");
response.setContentLength((int) (file.length()));
response.setHeader("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"");
IOUtils.copyLarge(fileInputStream, output);
output.flush();
} catch (IOException e) {
log.error(e.getMessage(), e);
}
}
}
AngularJs服务:download.service.js
(function() {
'use strict';
var downloadModule = angular.module('components.donwload', []);
downloadModule.factory('downloadService', ['$q', '$timeout', '$window',
function($q, $timeout, $window) {
return {
download: function(name) {
var defer = $q.defer();
$timeout(function() {
$window.location = 'download?name=' + name;
}, 1000)
.then(function() {
defer.resolve('success');
}, function() {
defer.reject('error');
});
return defer.promise;
}
};
}
]);
})();
AngularJs config:app.js
(function() {
'use strict';
var myApp = angular.module('myApp', ['components.donwload']);
/* myApp.config([function () {
}]);
myApp.run([function () {
}]);*/
})();
AngularJs控制器:download.controller.js
(function() {
'use strict';
angular.module('myApp')
.controller('DownloadSampleCtrl', ['downloadService', function(downloadService) {
this.download = function(fileName) {
downloadService.download(fileName)
.then(function(success) {
console.log('success : ' + success);
}, function(error) {
console.log('error : ' + error);
});
};
}]);
})();
index.html
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<title>My App</title>
<link rel="stylesheet" href="bower_components/normalize.css/normalize.css" />
<link rel="stylesheet" href="assets/styles/main.css" />
<link rel="icon" href="favicon.ico">
</head>
<body>
<div ng-controller="DownloadSampleCtrl as ctrl">
<button ng-click="ctrl.download('fileName.txt')">Download</button>
</div>
<script src="bower_components/angular/angular.min.js"></script>
<!-- App config -->
<script src="scripts/app/app.js"></script>
<!-- Download Feature -->
<script src="scripts/app/download/download.controller.js"></script>
<!-- Components -->
<script src="scripts/components/download/download.service.js"></script>
</body>
</html>
答案 6 :(得分:0)
// JAVA PART
@RequestMapping(value = "/report-excel", method = RequestMethod.GET)
public ResponseEntity<byte[]> getReportExcel(@RequestParam("bookingStatusType") String bookingStatusType,
@RequestParam("endDate") String endDate, @RequestParam("product") String product, @RequestParam("startDate") String startDate)throws IOException, ParseException {
//Generate Excel from DTO using any logic after that do the following
byte[] body = wb.getBytes();
HttpHeaders header = new HttpHeaders();
header.setContentType(new MediaType("application", "xlsx"));
header.set("Content-Disposition", "inline; filename=" + fileName);
header.setCacheControl("must-revalidate, post-check=0, pre-check=0");
header.setContentLength(body.length);
return new ResponseEntity<byte[]>(body, header, HttpStatus.OK);
}
//HTML PART
<html>
<head>
<title>Test</title>
<meta http-equiv="content-type" content="application/x-www-form-urlencoded; charset=UTF-8">
</head>
<body>
<form name="downloadXLS" method="get" action="http://localhost:8080/rest/report-excel" enctype="multipart/form-data">
<input type="text" name="bookingStatusType" value="SALES"></input>
<input type="text" name="endDate" value="abcd"></input>
<input type="text" name="product" value="FLIGHT"></input>
<input type="text" name="startDate" value="abcd"></input>
<input onclick="document.downloadXLS.submit()" value="Submit"></input>
</form>
</body>
</html>