don't use rangeDownload when previewing pdf

report/src/main/java/com/uas/report/controller/PdfController.java

@@ -8,12 +8,15 @@ import com.uas.report.util.FileUtils;
 import com.uas.report.util.ReportUtils;
 import net.sf.jasperreports.engine.JRException;
 import org.dom4j.DocumentException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 
+import javax.servlet.ServletOutputStream;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.File;
@@ -227,6 +230,8 @@ public class PdfController {
 		fileService.rangeDownload(file, n == null ? null : n + "."+ExportType.PDF.getQualifier(), request, response);
 	}
 
+	private Logger logger= LoggerFactory.getLogger(PdfController.class);
+
 	/**
 	 * 预览 pdf （Content Type 为 application/pdf）
 	 *
@@ -243,6 +248,27 @@ public class PdfController {
 		if(!file.getName().toLowerCase().endsWith(".pdf")){
 			throw new IOException("并非 pdf 文件：" + p);
 		}
-		fileService.rangeDownloadWithContentType(file, "application/pdf", request, response);
+        FileInputStream fis = new FileInputStream(file);
+
+        try {
+            response.setHeader("Content-Length", file.length() + "");
+            response.setContentType("application/pdf");
+
+            ServletOutputStream outputStream = response.getOutputStream();
+            byte[] data = new byte[1024];
+            int i;
+            int count = 0;
+            try {
+                while (count <= file.length() && (i = fis.read(data)) != -1) {
+                    outputStream.write(data, 0, i);
+                    count += i;
+                }
+                outputStream.flush();
+            } catch (IOException e) {
+                logger.error(e.getMessage());
+            }
+        } finally {
+            fis.close();
+        }
 	}
 }