jasper

采用servlet直接生成pdf等文件

public class TestServlet extends HttpServlet {
   
      public static final String XML_FILE_PATH =System.getProperty("user.dir")+"/WebRoot/WEB-INF/classes/reports/";
     
      protected void doGet(HttpServletRequest req, HttpServletResponse res)
      throws ServletException, IOException {

//    创建response输出流，设置responxe回应的头部
      OutputStream out = res.getOutputStream();
      res.setContentType("application/pdf");
      res.setHeader("Content-Disposition","attachment; filename=test1.pdf");  //filename为生成PDF的文件名
      String fileName = "test1.jrxml";
  Map map = null;

//    调用createPdf()获得PDF输出的字节流并打印出来。 
      byte[] bytes = createPdf(fileName,  map);
      res.setContentLength(bytes.length);
      out.write(bytes, 0, bytes.length);
      out.flush();
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse res)
    throws ServletException, IOException {
      doGet(req, res);
    }

//    封装创建PDF输出的compile和run方法，返回最终生成的字节流

    private byte[] createPdf(String fileName,  Map map) {
      String path = XML_FILE_PATH + fileName;//.jrxml文件的全路径
      String jrFile = XML_FILE_PATH + "test1.jasper";//编译结果.jasper文件的全路径
      byte[] bytes = null;
      try{
          JasperCompileManager.compileReportToFile(path, jrFile);
          //将.jrxml文件编译成.jasper文件
      }catch (JRException e){  
          e.printStackTrace();
      }
      try{
          bytes =JasperRunManager.runReportToPdf(jrFile, map, getMysqlConn());
          //生成相应的的字节流
      }catch (JRException e){
         e.printStackTrace();
      }
      return bytes;
    }