这是我如何处理碧玉JSON数组
可以说,我要举报过以下数组。
[
{"name":"Jerry", "value":"Jesus"},
{"name":"Gideon", "value": "Loves"},
{"name":"Eva", "value": "You"}
]
在设计报告时,请确保您将字段命名为与您的json字段名称完全相同的名称。所以在设计师中,我会添加两个名为的字段名称和值。您甚至可以根据需要为报表设计器添加尽可能多的参数。在这个例子中,我将在Jasper Studio中添加一个名为标题的参数。
现在这里是基于这个测试数组创建jasper报告的java代码。我将在代码中硬编码json数据,但是您可以从文件或任何您感觉最好的文件加载。我评论了代码以解释发生的事情。
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.export.JRXlsExporterParameter;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRXlsExporter;
import net.sf.jasperreports.engine.data.JsonDataSource;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperPrint;
import org.apache.commons.codec.binary.Base64;
import java.util.HashMap;
import java.util.Locale;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.io.*;
//Class Name. This must match the class name you put in your build.gradle file
public class JasperPDFExample {
public static void main(String[] args) {
try {
try {
//Our json object. This can be loaded from file
String rawJsonData = "[{\"name\":\"Jerry\", \"value\":\"Jesus\"},"
+ "{\"name\":\"Gideon\", \"value\": \"Loves\"},"
+ "{\"name\":\"Eva\", \"value\": \"You\"}"
+ "]";
//Load compiled jasper report that we created on first section.
JasperReport report = (JasperReport) JRLoader.loadObject(new File("/home/jerry/Sample.jasper"));
//Convert json string to byte array.
ByteArrayInputStream jsonDataStream = new ByteArrayInputStream(rawJsonData.getBytes());
//Create json datasource from json stream
JsonDataSource ds = new JsonDataSource(jsonDataStream);
//Create HashMap to add report parameters
Map parameters = new HashMap();
//Add title parameter. Make sure the key is same name as what you named the parameter in jasper report.
parameters.put("title", "Jasper PDF Example");
//Create Jasper Print object passing report, parameter json data source.
JasperPrint jasperPrint = JasperFillManager.fillReport(report, parameters, ds);
//Export and save pdf to file
JasperExportManager.exportReportToPdfFile(jasperPrint,"/home/jerry/jasperpdfexample.pdf");
} catch (JRException ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
} catch (Exception ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
}
} catch (Exception ex) {
ex.printStackTrace();
throw new RuntimeException(ex);
}
}
}
感谢https://mis.io/pub/how-to-create-a-jasper-pdf-report-from-a-json-datasource-in-java/我能得到这个伴随着设置Java使用gradle这个构建工具碧玉工作。
你有没有得到这个工作?我现在正在尝试相同的东西 – Marianna 2013-01-16 15:10:32