Java 导出到CSV文件并在浏览器中打开

我遇到了一个问题，我需要将数据导出到.csv文件，但不将文件存储在文件系统中，而是只需在浏览器中打开文件

我编写了以下代码将数据写入.csv文件：

FileWriter myWriter = new FileWriter("output.csv");
myWriter.append(EmployeeCode);
myWriter.append(',');
myWriter.append(Band);
myWriter.append('\n');
response.setHeader("Content-Disposition", "attachment; filename=output.csv"); 
response.setContentType("application/ms-excel"); 
response.setCharacterEncoding("UTF-8");

我可以打开一个.csv文件，但它是空的。我的数据没有填充到其中。

---

请说明我做错了什么。

FileWriter

将内容写入

output.csv

文件，而不是响应输出流。你应该这样做：

OutputStream out = response.getOutputStream();

response.setContentType("application/ms-excel"); // or you can use text/csv
response.setHeader("Content-Disposition", "attachment; filename=output.csv"); 
try {
    // Write the header line
    OutputStream out = response.getOutputStream();
    String header = "EmployeeCode, Band\n";
    out.write(header.getBytes());
    // Write the content
    String line=new String(EmployeeCode+","+Band+"\n");
    out.write(line.toString().getBytes());
    out.flush();
} catch (Exception e) {
   log.error(e);
}

以获取响应输出流

然后在

out

流中写入内容，类似于：

OutputStream out = response.getOutputStream();

response.setContentType("application/ms-excel"); // or you can use text/csv
response.setHeader("Content-Disposition", "attachment; filename=output.csv"); 
try {
    // Write the header line
    OutputStream out = response.getOutputStream();
    String header = "EmployeeCode, Band\n";
    out.write(header.getBytes());
    // Write the content
    String line=new String(EmployeeCode+","+Band+"\n");
    out.write(line.toString().getBytes());
    out.flush();
} catch (Exception e) {
   log.error(e);
}

---

在末尾添加

myWriter.flush（）；myWriter.close（）&在写入时在屏幕
System.out.println（EmployeeCode+“=”+波段）上打印相同的数据并查看您是否正在获取数据。法希姆，是的，我正在使用Sys out打印数据。@user179516我们应该关闭文件写入程序以从末尾的流中读取：）您是否可以在末尾添加
myWriter.flush（）；myWriter.close（）然后让我知道你得到了什么？