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java - 报告在后端正常，但从 spring boot 使用 ajax 下载时收到的报告为空

转载 作者：行者123 更新时间：2023-11-30 01:59:15 27 4
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我的堆栈

Spring 启动 1.5.6
JasperReport
Ajax JQuery 3.1.1

我的目标

我第一次尝试使用 jasper 报告打印报告，我有一个打印服务，我存储了我的报告，我的想法是通过包含数据的 ajax 发送 http 请求并获取 pdf 报告

我尝试过的

我的 spring-boot 后端有一个休息 Controller ，它是这样实现的

@RestController
@RequestMapping(PrintController.API)
public class PrintController {
    public static final String API="print";

    @PostMapping("client")
    public void export(@RequestBody List<ClientJsonDto> datas,HttpServletResponse response){

        System.out.println(datas);
         JRBeanCollectionDataSource itemsJRBean = new JRBeanCollectionDataSource(datas);

    /* Map to hold Jasper report Parameters */
    Map<String, Object> parameters = new HashMap<String, Object>();
    parameters.put("ItemDataSource", itemsJRBean);

    byte[] bytes = generatePDFReport("refclient", parameters);
    return ResponseEntity
              .ok()
              // Specify content type as PDF
              .header("Content-Type", "application/pdf; charset=UTF-8")
              // Tell browser to display PDF if it can
              .header("Content-Disposition", "attachment;inline; filename=\"client.pdf\"")
              .body(bytes);
       
    }


public byte[] generatePDFReport(String inputFileName, Map<String, Object> params) {
    return generatePDFReport(inputFileName, params, new JREmptyDataSource());
}

    
public File loadJasperFile(String file) {
    
    try {
        return ResourceUtils.getFile("classpath:static/reports/"+file+".jasper");
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    };
    return null;
}

public byte[] generatePDFReport(String inputFileName, Map<String, Object> params,
        JRDataSource dataSource) {
        byte[] bytes = null;
        JasperReport jasperReport = null;
        try (ByteArrayOutputStream byteArray = new ByteArrayOutputStream()) {
          // Check if a compiled report exists


            jasperReport = (JasperReport) JRLoader.loadObject(loadJasperFile(inputFileName));
          
          // Compile report from source and save
       
          JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, dataSource);
          // return the PDF in bytes
          bytes = JasperExportManager.exportReportToPdf(jasperPrint);
        }
        catch (JRException | IOException e) {
          e.printStackTrace();
        }
        return bytes;
      }

}

我的报告如下

    <?xml version="1.0" encoding="UTF-8"?>
    <!-- Created with Jaspersoft Studio version 7.2.0.final using JasperReports Library version 6.6.0  -->
    <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="refClient" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" isIgnorePagination="true" uuid="576dcd38-2982-412b-93d5-2a078da1b183">
        <property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
        <style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <style name="Table 1_TH" mode="Opaque" backcolor="#F0F8FF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <style name="Table 1_CH" mode="Opaque" backcolor="#BFE1FF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <style name="Table 1_TD" mode="Opaque" backcolor="#FFFFFF">
            <box>
                <pen lineWidth="0.5" lineColor="#000000"/>
                <topPen lineWidth="0.5" lineColor="#000000"/>
                <leftPen lineWidth="0.5" lineColor="#000000"/>
                <bottomPen lineWidth="0.5" lineColor="#000000"/>
                <rightPen lineWidth="0.5" lineColor="#000000"/>
            </box>
        </style>
        <subDataset name="ItemDataset" uuid="2914f7c6-c2d7-448b-b0c1-090970e18ed6">
            <queryString>
                <![CDATA[]]>
            </queryString>
            <field name="clientName" class="java.lang.String"/>
            <field name="identifiant" class="java.lang.String"/>
            <field name="codeExterne" class="java.lang.String"/>
        </subDataset>
        <parameter name="ItemDataSource" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
        <queryString>
            <![CDATA[select 1 from dual]]>
        </queryString>
        <background>
            <band splitType="Stretch"/>
        </background>
        <title>
            <band height="50">
                <staticText>
                    <reportElement x="11" y="11" width="100" height="30" uuid="9d66bc1e-2b6d-49b7-8a64-74fbd2e5d5eb"/>
                    <text><![CDATA[Liste des clients]]></text>
                </staticText>
            </band>
        </title>
        <detail>
            <band height="256" splitType="Stretch">
                <componentElement>
                    <reportElement x="0" y="0" width="555" height="200" uuid="7786bb05-503a-4b6a-991a-a7bcf3abad07">
                        <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>
                        <property name="com.jaspersoft.studio.table.style.table_header" value="Table 1_TH"/>
                        <property name="com.jaspersoft.studio.table.style.column_header" value="Table 1_CH"/>
                        <property name="com.jaspersoft.studio.table.style.detail" value="Table 1_TD"/>
                    </reportElement>
                    <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd">
                        <datasetRun subDataset="ItemDataset" uuid="d3e1e03a-2c83-4436-9e50-79518bc3d337">
                            <dataSourceExpression><![CDATA[$P{ItemDataSource}]]></dataSourceExpression>
                        </datasetRun>
                        <jr:column width="130" uuid="dca8961f-ce2d-47ac-879c-b15847d170a9">
                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Colonne1"/>
                            <jr:tableHeader style="Table 1_TH" height="30" rowSpan="1">
                                <staticText>
                                    <reportElement x="0" y="0" width="130" height="30" uuid="f60d1675-6fb6-4569-93ca-de32b3a8e861"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <text><![CDATA[Nom]]></text>
                                </staticText>
                            </jr:tableHeader>
                            <jr:detailCell style="Table 1_TD" height="30">
                                <textField>
                                    <reportElement x="0" y="0" width="130" height="30" uuid="f1de366a-b36f-4200-9b1e-7a0009be5373"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <textFieldExpression><![CDATA[$F{clientName}]]></textFieldExpression>
                                </textField>
                            </jr:detailCell>
                        </jr:column>
                        <jr:column width="140" uuid="980fffb5-1088-47a6-b00f-b5d08b7093c9">
                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Colonne2"/>
                            <jr:tableHeader style="Table 1_TH" height="30" rowSpan="1">
                                <staticText>
                                    <reportElement x="0" y="0" width="140" height="30" uuid="16679b95-2e6e-4ca1-b8b6-dd7b74267c56"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <text><![CDATA[Identifiant]]></text>
                                </staticText>
                            </jr:tableHeader>
                            <jr:detailCell style="Table 1_TD" height="30">
                                <textField>
                                    <reportElement x="0" y="0" width="140" height="30" uuid="341e7faf-9680-4941-a9a4-ac78b8f4aae0"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <textFieldExpression><![CDATA[$F{identifiant}]]></textFieldExpression>
                                </textField>
                            </jr:detailCell>
                        </jr:column>
                        <jr:column width="100" uuid="761d1134-6b53-4b5d-9355-b44586d8d8aa">
                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Colonne3"/>
                            <jr:tableHeader style="Table 1_TH" height="30" rowSpan="1">
                                <staticText>
                                    <reportElement x="0" y="0" width="100" height="30" uuid="b07f5db5-1df8-48e9-a612-27ad6110fdcd"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <text><![CDATA[Code]]></text>
                                </staticText>
                            </jr:tableHeader>
                            <jr:detailCell style="Table 1_TD" height="30">
                                <textField>
                                    <reportElement x="0" y="0" width="100" height="30" uuid="1e0438b1-82e5-429a-b63a-5349014cf84a"/>
                                    <box>
                                        <topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                        <rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
                                    </box>
                                    <textFieldExpression><![CDATA[$F{codeExterne}]]></textFieldExpression>
                                </textField>
                            </jr:detailCell>
                        </jr:column>
                    </jr:table>
                </componentElement>
            </band>
        </detail>
    </jasperReport>

如您所见，我正在使用发送 jrcollection 的参数，这是我在 YouTube 上找到的教程中使用的。

对于响应处理，我有这个 js ajax 调用

$(document).on('click', '#menu0-func1-menu0-func1', function(){
        console.log(printData);
        var jsonData =JSON.parse(JSON.stringify(printData));
            var settings = {
                "async" : true,
                "crossDomain" : true,
                "url" : "http://"+document.location.host+"/facturation/print/client",
                "method" : "POST",
                "headers" : {
                    "cache-control" : "no-cache",
                    'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
                },
                "processData" : false,
                "contentType" : "application/json",
                "dataType" : "text",
                "data" : JSON.stringify(printData)
            }

            $.ajax(settings).done(function(response, status, xhr) {
                console.log(response);
                  
                // check for a filename
                var filename = "";
                var disposition = xhr.getResponseHeader('Content-Disposition');
                if (disposition && disposition.indexOf('attachment') !== -1) {
                    var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
                    var matches = filenameRegex.exec(disposition);
                    if (matches != null && matches[1]) filename = matches[1].replace(/['"]/g, '');
                }

                var type = xhr.getResponseHeader('Content-Type');
                var blob = new Blob([response], { type: type });

                if (typeof window.navigator.msSaveBlob !== 'undefined') {
                    // IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed."
                    window.navigator.msSaveBlob(blob, filename);
                } else {
                    var URL = window.URL || window.webkitURL;
                    var downloadUrl = URL.createObjectURL(blob);

                    if (filename) {
                        // use HTML5 a[download] attribute to specify filename
                        var a = document.createElement("a");
                        // safari doesn't support this yet
                        if (typeof a.download === 'undefined') {
                            window.location = downloadUrl;
                        } else {
                            a.href = downloadUrl;
                            a.download = filename;
                            document.body.appendChild(a);
                            a.click();
                        }
                    } else {
                        window.location = downloadUrl;
                    }

                    setTimeout(function () { URL.revokeObjectURL(downloadUrl); }, 100); // cleanup
                }
            
            });
    });

也不异常(exception)，通常我至少应该得到报告的标题，但我得到的是一个空的 pdf 页面

这是我在 Chrome 中的控制台日志

    %PDF-1.5
    %����
    3 0 obj
    <</Filter/FlateDecode/Length 882>>stream
    x���[O1���W��>�z|�M^i�J�B�T��e�Q��`����zJc�����}|2_���hU�R,d)Vuq�*�J�u!�W�{a�X�w' @�US�Y�t��D��ޤ�)�e��Ӧ8��m�ע^���n��n�#���9��O�\�ג�K��Rֺw�����
    �r��59��>/� 0^���r�`ޙ�ֈ�h�!�`�/���5�KƆ��Yb�\
    #��1hP�
    �ďK.fYyk?���%�6T�!�}�˾(j�on7����M���?F6���V��F�M^&�IjywI�h��������WV1d���L2N�w��̦%�E�c�B��I��єB�R��b!�2�f���d=*�I�����"�KB�"
    ��᳍&�������ֲX�df2��C"�zf�#)Ό�wLJ��F����аH��E#
    ��%/!b=��,�"y�XKyA˿��e
    endstream
    endobj
    1 0 obj
    <</Tabs/S/Group<</S/Transparency/Type/Group/CS/DeviceRGB>>/Contents 3 0 R/Type/Page/Resources<</ColorSpace<</CS/DeviceRGB>>/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]/Font<</F1 2 0 R>>>>/Parent 4 0 R/MediaBox[0 0 595 842]>>
    endobj
    5 0 obj
    [1 0 R/XYZ 0 852 0]
    endobj
    2 0 obj
    <</Subtype/Type1/Type/Font/BaseFont/Helvetica/Encoding/WinAnsiEncoding>>
    endobj
    4 0 obj
    <</Kids[1 0 R]/Type/Pages/Count 1/ITXT(2.1.7)>>
    endobj
    6 0 obj
    <</Names[(JR_PAGE_ANCHOR_0_1) 5 0 R]>>
    endobj
    7 0 obj
    <</Dests 6 0 R>>
    endobj
    8 0 obj
    <</Names 7 0 R/Type/Catalog/Pages 4 0 R/ViewerPreferences<</PrintScaling/AppDefault>>>>
    endobj
    9 0 obj
    <</ModDate(D:20181123161409Z)/Creator(JasperReports Library version 6.4.0)/CreationDate(D:20181123161409Z)/Producer(iText 2.1.7 by 1T3XT)>>
    endobj
    xref
    0 10
    0000000000 65535 f 
    0000000964 00000 n 
    0000001240 00000 n 
    0000000015 00000 n 
    0000001328 00000 n 
    0000001205 00000 n 
    0000001391 00000 n 
    0000001445 00000 n 
    0000001477 00000 n 
    0000001580 00000 n 
    trailer
    <</Info 9 0 R/ID [<b7d27a6f96e6278f5c1d222f79d7c999><b97ae89e1e568703aeb75af2080d04d8>]/Root 8 0 R/Size 10>>
    startxref
    1735
    %%EOF

该怎么办，这三天我尝试了很多教程，但没有成功

编辑

我使用 JasperExportManager.exportReportToPdfFile(jasperPrint, "rapport.pdf"); 生成了 pdf，并且 pdf 文件格式良好，我将这个良好 pdf 的 txt 表示与收到的日志进行了比较，它们是相同的，我的空 pdf 是 3kb，格式良好也是3kb。

最佳答案

我已经尝试过您的 JavaScript 代码，确实存在问题。

但问题出在 jQuery 的 ajax 实现内部。它无法正确处理响应数据类型。

这篇文章here提出了两种选择:要么使用 XMLHttpRequest直接对象或使用自定义 jQuery plugin专门针对这个问题而设计。

另一种选择可能是将 Controller 逻辑分为两部分:

  • 在第一次请求时，您需要填写报告参数
  • 在第二个中，您将生成 PDF 输出；您甚至可以在新选项卡中打开它并跳过整个 AJAX 部分。

关于java - 报告在后端正常，但从 spring boot 使用 ajax 下载时收到的报告为空，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53450233/

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