First proposition for introduction to spring-yarg (#2540)

libraries/src/main/java/com/baeldung/yarg/DocumentController.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.yarg;
+
+import com.haulmont.yarg.formatters.factory.DefaultFormatterFactory;
+import com.haulmont.yarg.loaders.factory.DefaultLoaderFactory;
+import com.haulmont.yarg.loaders.impl.JsonDataLoader;
+import com.haulmont.yarg.reporting.Reporting;
+import com.haulmont.yarg.reporting.RunParams;
+import com.haulmont.yarg.structure.Report;
+import com.haulmont.yarg.structure.ReportBand;
+import com.haulmont.yarg.structure.ReportOutputType;
+import com.haulmont.yarg.structure.impl.BandBuilder;
+import com.haulmont.yarg.structure.impl.ReportBuilder;
+import com.haulmont.yarg.structure.impl.ReportTemplateBuilder;
+import java.io.File;
+import java.io.IOException;
+import javax.servlet.http.HttpServletResponse;
+import org.apache.commons.io.FileUtils;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DocumentController {
+
+    @RequestMapping(path = "/generate/doc", method = RequestMethod.GET)
+    public void generateDocument(HttpServletResponse response) throws IOException {
+        ReportBuilder reportBuilder = new ReportBuilder();
+        ReportTemplateBuilder reportTemplateBuilder = new ReportTemplateBuilder()
+            .documentPath("./src/main/resources/Letter.docx")
+            .documentName("Letter.docx")
+            .outputType(ReportOutputType.docx)
+            .readFileFromPath();
+        reportBuilder.template(reportTemplateBuilder.build());
+        BandBuilder bandBuilder = new BandBuilder();
+        String json = FileUtils.readFileToString(new File("./src/main/resources/Data.json"));
+        ReportBand main = bandBuilder.name("Main")
+            .query("Main", "parameter=param1 $.main", "json")
+            .build();
+        reportBuilder.band(main);
+        Report report = reportBuilder.build();
+
+        Reporting reporting = new Reporting();
+        reporting.setFormatterFactory(new DefaultFormatterFactory());
+        reporting.setLoaderFactory(
+            new DefaultLoaderFactory()
+                .setJsonDataLoader(new JsonDataLoader()));
+        response.setContentType("application/vnd.openxmlformats-officedocument.wordprocessingml.document");
+        reporting.runReport(new RunParams(report).param("param1", json), response.getOutputStream());
+    }
+
+}