[英]Convert JSON Data into Excel File Download in Javascript
I have a AJAX POST Request fetching data back in form of a JSON Array.我有一个 AJAX POST 请求以 JSON 数组的形式取回数据。 I want to convert this received JSON Data into an Excel File (Not CSV) for download (on a button-click), pls help.我想将此收到的 JSON 数据转换为 Excel 文件(不是 CSV)以供下载(单击按钮),请帮助。 The JSON Data might have blank values and missing fields for each JSON row.每个 JSON 行的 JSON 数据可能有空白值和缺失字段。
I tried this in Client side using Javascript but not in Java server side in which case I will have to use @Produces(MediaType.MULTIPART_FORM_DATA) in the AJAX End-Point method, which is something I can try but think its complex.我在客户端使用 Javascript 进行了尝试,但在 Java 服务器端没有尝试过,在这种情况下,我将不得不在 AJAX 端点方法中使用 @Produces(MediaType.MULTIPART_FORM_DATA),这是我可以尝试的,但认为它很复杂。
a) AJAX Request code: a) AJAX 请求代码:
function fileUploadFunction() {
var file = $('input[name="file"').get(0).files[0];
var formData = new FormData();
if(file.name != null) {
document.getElementById("btnUpload").disabled = false;
formData.append('file', file);
$.ajax({
url : "<%=request.getContextPath()%>/rest/upload/upload",
type : "POST",
data : formData,
cache : false,
contentType : false,
processData : false,
success : function(response) {
//Store result in Session and Enable Download button
var cacheString = JSON.stringify(response, null, 2);
console.log("-----------------> cacheString is: " + cacheString);
if(cacheString != null && cacheString != "[]") {
document.getElementById("download").disabled = false;
}
var sessionresponse = sessionStorage.setItem("i98779", cacheString);
console.log("response is: " + response);
console.log("cacheString is: " + cacheString);
excelDownload(cacheString);
//createTable(response);
//https://stackoverflow.com/questions/47330520/how-to-export-json-object-into-excel-using-javascript-or-jquery
},
error : function(jqXHR, textStatus, errorThrown) {
console.log(errorThrown);
alert("Error: " + errorThrown);
}
});//ajax ends
}//if ends
}//Function ends
b) JSON Sample data received from AJAX POST Request: b) 从 AJAX POST 请求接收的 JSON 样本数据:
[
{
"entityid":2,
"firstname":"George",
"lastname":"Bush",
"ssn":"",
"city":"Houston",
"state":"TX",
"country":"USA",
"zipcode":""
},
{
"entityid": 8,
"firstname": "Jim",
"lastname": "Macron",
"ssn": "888-88-8888",
"city": "Paris",
"state": "NY",
"country": "France",
"zipcode": "T789J"
},
{
"entityid": 11,
"firstname": "Angela",
"lastname": "Merkel",
"city": "Saxony",
"zipcode": ""
},
{
"entityid": 7,
"firstname": "Donald",
"lastname": "Trump",
"ssn": "777-77-7777",
"city": "Washington D.C.",
"state": "DC",
"country": "USA",
"zipcode": "70000"
}
]
This is a method to produce an excel from the WebService (Resteasy Implementation), tested and fully working:这是一种从 WebService(Resteasy 实现)生成 excel 的方法,经过测试并且可以正常工作:
@POST
@Path("/excelpost")
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response downloadFilePost( ) throws IOException {
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Datatypes in Java");
Object[][] datatypes = {
{"Datatype", "Type", "Size(in bytes)"},
{"int", "Primitive", 2},
{"float", "Primitive", 4},
{"double", "Primitive", 8},
{"char", "Primitive", 1},
{"String", "Non-Primitive", "No fixed size"}
};
int rowNum = 0;
System.out.println("Creating excel");
for (Object[] datatype : datatypes) {
Row row = sheet.createRow(rowNum++);
int colNum = 0;
for (Object field : datatype) {
Cell cell = row.createCell(colNum++);
if (field instanceof String) {
cell.setCellValue((String) field);
} else if (field instanceof Integer) {
cell.setCellValue((Integer) field);
}
}
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
workbook.write(outputStream);
workbook.close();
return Response.status(200).header("Access-Control-Allow-Origin", "*")
.header("Content-Disposition", "attachment;filename='fileName.xlsx'")
.header("Access-Control-Allow-Headers", "origin, content-type, accept, authorization")
.header("Access-Control-Allow-Credentials", "true")
.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD")
.header("Access-Control-Max-Age", "1209600").entity( new ByteArrayInputStream(outputStream.toByteArray() )).build();
}
this is the maven dependency to manage Excel file:这是管理 Excel 文件的 Maven 依赖项:
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
You could easily add proper annotations and webparameter to manage file input from startin post of your service:您可以轻松地添加适当的注释和 web 参数来管理从您的服务启动后的文件输入:
@POST
@Path("/excelpost")
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public Response downloadFilePost(MultipartFormDataInput input)
.......
Let me know if it helps...让我知道它是否有帮助...
@Blackjack, below is the code ... @Blackjack,下面是代码...
1) Function being called on click of a button. 1)单击按钮时调用的函数。 This has AJAX Call that passes an Excel file to a REST Endpoint function:这具有将 Excel 文件传递给 REST Endpoint 函数的 AJAX 调用:
function fileUploadFunction() {
var file = $('input[name="file"').get(0).files[0];
var formData = new FormData();
if(file.name != null) {
document.getElementById("btnUpload").disabled = false;
formData.append('file', file);
$.ajax({
url : "<%=request.getContextPath()%>/rest/upload/bulkSearch",
type : "POST",
data : formData,
cache : false,
contentType : false,
processData : false,
success : function(response) {
//Store result in Session and Enable Download button
var cacheString = JSON.stringify(response, null, 2);
console.log("-----------------> cacheString is: " + cacheString);
if(cacheString != null && cacheString != "[]") {
document.getElementById("download").disabled = false;
}
var sessionresponse = sessionStorage.setItem("i98779", cacheString);
console.log("response is: " + response);
console.log("cacheString is: " + cacheString);
//excelDownload(cacheString);
//createTable(response);
//https://stackoverflow.com/questions/47330520/how-to-export-json-object-into-excel-using-javascript-or-jquery
},
error : function(jqXHR, textStatus, errorThrown) {
console.log(errorThrown);
alert("Error: " + errorThrown);
}
});//ajax ends
}//if ends
}//Function ends
2) REST End-Point function: 2)REST端点功能:
@POST
@Consumes(MediaType.MULTIPART_FORM_DATA)
@Produces(MediaType.APPLICATION_OCTET_STREAM)
@Path("/bulkSearch")
public Response bulkSearch(
@FormDataParam("file") InputStream uploadedInputStream,
@FormDataParam("file") FormDataContentDisposition fileDetail) throws IOException {
System.out.println("Entered uploadFile method");
System.out.println("uploadedInputStream is: " + uploadedInputStream);
System.out.println("fileDetail is: " + fileDetail.toString());
String returnJSON = null;
List<User> usersList = null;
ObjectMapper uploadMapper = new ObjectMapper();
//System.out.println("File name is: " + fileDetail.getFileName());
//System.out.println("File size is : " + fileDetail.getSize());
//System.out.println("File size is : " + fileDetail.getType());
// check if all form parameters are provided
if (uploadedInputStream == null || fileDetail == null)
return Response.status(400).entity("Invalid form data").build();
System.out.println("Checked Input file is ok");
System.out.println("----------------------------------------------------------------");
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Datatypes in Java");
Object[][] datatypes = {
{"Datatype", "Type", "Size(in bytes)"},
{"int", "Primitive", 2},
{"float", "Primitive", 4},
{"double", "Primitive", 8},
{"char", "Primitive", 1},
{"String", "Non-Primitive", "No fixed size"}
};
int rowNum = 0;
System.out.println("Creating excel");
for (Object[] datatype : datatypes) {
Row row = sheet.createRow(rowNum++);
int colNum = 0;
for (Object field : datatype) {
org.apache.poi.ss.usermodel.Cell cell = row.createCell(colNum++);
if (field instanceof String) {
cell.setCellValue((String) field);
} else if (field instanceof Integer) {
cell.setCellValue((Integer) field);
}
}
}
System.out.println("For loop done");
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); //-----> no reference to excel cells here
System.out.println("outputstream done");
workbook.write(outputStream);
System.out.println("workbook.write done");
workbook.close();
System.out.println("workbook closed");
return Response.status(200).header("Access-Control-Allow-Origin", "*")
.header("Content-Disposition", "attachment;filename='fileName.xlsx'")
.header("Access-Control-Allow-Headers", "origin, content-type, accept, authorization")
.header("Access-Control-Allow-Credentials", "true")
.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS, HEAD")
.header("Access-Control-Max-Age", "1209600").entity( new ByteArrayInputStream(outputStream.toByteArray() )).build();
}
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