构建 excel 文件并将其发送到客户端 jax-rs java

Question

您好，我正在尝试从端点动态构建 excel 数据，然后使用 java JAX-RS

return 将其返回给我的客户端

所以现在我有一个简单的按钮可以调用我的函数，该函数可以访问这个 java 端点，我正在尝试使用 StringBuilder 来构建我想要 return 放置的数据将其发送到 CSV XLS 或其他任何内容，然后 return 发送给客户端。

@GET  
    @Path("/excelregisterbycountry")  
    @Produces(MediaType.APPLICATION_OCTET_STREAM)  
    public Response excelRegister(
            @QueryParam("ModelNumber") String modelNbr,
            @DefaultValue("US") @QueryParam("Country") String country) { 

        String myQuery = "";


        try {
            database = new EstateDatabaseManager(azureHost, azureDB);

        } catch (Exception e) {
            connectionFailed = true;
            slrLog.write(DB_CONNECT_FAIL + e.getMessage());
        }

        if (!connectionFailed) {


                 myQuery = "SELECT distinct spr.country_code, spr.store_nbr, spr.register_nbr, spr.os_version_nbr, sco.adkversion, sco.termType, RTRIM(spr.bios_version_nbr), RTRIM(rt.model_nbr), st.store_type_desc, psi.os_level_id, psi.gsa_level_id, RTRIM(psi.self_checkout_type_cd), psi.si_level, psi.pf_level " +
                          "FROM str_pos_register2 spr " +
                          "JOIN register_type rt " +
                          "ON rt.register_type_cd = spr.register_type_cd " +
                          "join pos_store_info3 psi " +
                          "ON psi.country_code = spr.country_code " +
                          "AND psi.store_nbr = spr.store_nbr " +
                          "join store_type as st " +
                          "on psi.store_type_cd = st.store_type_cd " +
                          "Left join sco.daily sco " +
                          "on spr.register_nbr = sco.registernbr and  spr.country_code = sco.countryCode and spr.store_nbr = sco.storeNbr and cast(spr.last_check_ts as date) = sco.reportDate " +
                          "WHERE spr.country_code <> '??' " +
                          "AND psi.store_status_code = 0 " +
                          "AND rt.model_nbr = ? " +
                          "AND spr.country_code = ? " +
                          "AND spr.last_check_ts > (CURRENT_TIMESTAMP -7) "+
                          "ORDER BY spr.store_nbr";
            }

            try {
                    StringBuilder sb = new StringBuilder();

                    sb.append("Country Code");
                    sb.append(",");
                    sb.append("Store Number");
                    sb.append(",");
                    sb.append("Register NUmber");
                    sb.append(",");
                    sb.append("OS Version");
                    sb.append(",");
                    sb.append("ADK Version");
                    sb.append(",");
                    sb.append("Term Type");
                    sb.append(",");
                    sb.append("Bios Version");
                    sb.append(",");
                    sb.append("Model Number");
                    sb.append(",");
                    sb.append("Store Type");
                    sb.append(",");
                    sb.append("OS Level ID");
                    sb.append(",");
                    sb.append("GSA Level ID");
                    sb.append(",");
                    sb.append("Self Checkout Ind");
                    sb.append(",");
                    sb.append("siLevel");
                    sb.append(",");
                    sb.append("pfLevel");
                    sb.append(",");
                    sb.append("\n");
                trouxInfoScoRegisterObject[] dataObject = null;
                List<trouxInfoScoRegisterObject> dataStore = new ArrayList<trouxInfoScoRegisterObject>();
                trouxInfoScoRegisterObject trouxRegister = null;
                PackageType<trouxInfoScoRegisterObject> t = new PackageType<>();

                database.prepareSQL(myQuery);
                database.addParameter(modelNbr, EstateDatabaseManager.TYPE_STRING);
                database.addParameter(country, EstateDatabaseManager.TYPE_STRING);
                database.query();
                while (database.nextRow()) {
                    trouxRegister = new trouxInfoScoRegisterObject();
                    String countryCode = database.getColumn(1);
                    Integer storeNumber = database.getColumnInt(2);
                    Integer registerNumber = database.getColumnInt(3);
                    String osVersionNbr = database.getColumn(4);
                    String adkVersion = database.getColumn(5);
                    String termType = database.getColumn(6);
                    String biosVersionNbr = database.getColumn(7);
                    String ModelNumber = database.getColumn(8);
                    String storeType = database.getColumn(9);
                    String osLevelId = database.getColumn(10);
                    String gsaLevelId = database.getColumn(11);
                    String selfCheckoutInd = database.getColumn(12);
                    String siLevel = database.getColumn(13);
                    String pfLevel = database.getColumn(14);

                    sb.append(countryCode);
                    sb.append(",");
                    sb.append(storeNumber);
                    sb.append(",");
                    sb.append(registerNumber);
                    sb.append(",");
                    sb.append(osVersionNbr);
                    sb.append(",");
                    sb.append(adkVersion);
                    sb.append(",");
                    sb.append(termType);
                    sb.append(",");
                    sb.append(biosVersionNbr);
                    sb.append(",");
                    sb.append(ModelNumber);
                    sb.append(",");
                    sb.append(storeType);
                    sb.append(",");
                    sb.append(osLevelId);
                    sb.append(",");
                    sb.append(gsaLevelId);
                    sb.append(",");
                    sb.append(selfCheckoutInd);
                    sb.append(",");
                    sb.append(siLevel);
                    sb.append(",");
                    sb.append(pfLevel);
                    sb.append(",");
                    sb.append("\n");


                }

                FileWriter file = new FileWriter("test.csv");
                file.append(sb.toString());
                ResponseBuilder rb = Response.ok(file);
                rb.header("content-disposition", "attachment; filename=rest-test.xlsx");
                return rb.build();


            }catch(Exception e) {
                slrLog.write(NEXT_ROW_ERR + e.getMessage());
                }

我正在尝试构建这一切，然后 return 将其返回给客户端我只想 return StringBuilder 构建成 CSV 格式的内容。一切运行顺利，直到 return 它说找不到源，因为当然，我在任何地方都没有 test.csv。我尝试只做 response.ok(sb.tostring()) 但它只是 return 将我的数据以纯文本形式返回给客户端，而不是 CSV 或 excel 文件。如果有任何帮助，我将不胜感激。

Answer 1

不要因为是文件下载就使用application/octet-stream。根据数据的实际情况使用正确的 MIME 类型。如果它是 CSV 文件，则使用 text/csv 因为这是标准的 ¹
```
@Produces("text/csv")
```

对于实体，只需 return 字符串。这就是您需要做的全部。不需要 File 或 FileWriter 或任何类型的中间存储。

return Response.ok(sb.toString())
        .header(HttpHeaders.CONTENT_DISPOSITION, 
                "attachment;filename=test.csv")
        .build();

就是这样。很简单。

请注意，CSV 和 Excel 文件不是一回事。 CSV 文件是文本文件，而 Excel 文件是二进制文件。您的数据是 CSV 数据，所以我不确定您为什么将文件名标记为 .xls 文件。应该是.csv

_{1. Incomplete list of MIME types}

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