java - 使用jasper和servlet以pdf格式创建报告

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我想使用servlet，.jasper文件以pdf格式创建报告，但是有一个例外：


  HTTP状态500-Servlet执行引发异常

--------------------------------------------------------------------------------

type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling     this request.

exception

  
  javax.servlet.ServletException：Servlet执行引发异常
  
  根本原因
  
  java.lang.NoClassDefFoundError：
  net / sf / jasperreports / engine / JasperRunManager
    一个.Patient.doGet（Patient.java:46）
    javax.servlet.http.HttpServlet.service（HttpServlet.java:621）
    javax.servlet.http.HttpServlet.service（HttpServlet.java:728）
  
  note备注在Apache中可以找到根本原因的完整堆栈跟踪
  Tomcat / 7.0.34日志。
  
  


servlet代码是：

package one;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.util.HashMap;

import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperRunManager;

/**
 * Servlet implementation class Patient
 */
@WebServlet("/Patient")
public class Patient extends HttpServlet implements Servlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Patient() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        Connection con=DBCon.getConnection();
        InputStream inS=getServletContext().getResourceAsStream("/report-src/ganeshaji.jashper");

        OutputStream outS=response.getOutputStream();
        response.setContentType("application/pdf");

        try {
            JasperRunManager.runReportToPdfStream(inS, outS, new HashMap<String, Object>(),con);
            outS.flush();
            con.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            response.setContentType("text/html");
            e.printStackTrace();
        }
        }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

请提供解决方案

最佳答案

通过研究根本原因

java.lang.NoClassDefFoundError: net/sf/jasperreports/engine/JasperRunManager

好像您错过了jasper jar或版本错误，不支持JasperRunManager。

在类路径中包含适当的jar将解决您的问题。

请下载以下罐子：

itext-4.2.0.jar

itextpdf-5.3.4.jar

jasperreports-4.0.1.jar

jasperreports-fonts-4.0.0.jar

并编写如下代码：

try {
FileInputStream fis = new FileInputStream(YOURREPORTPATH.jasper");
BufferedInputStream bufferedInputStream = new BufferedInputStream(fis);
jasperReport = (JasperReport) JRLoader.loadObject(bufferedInputStream);
} catch (Exception e2) {
 e2.printStackTrace();
}

然后在填充参数和数据源之后，创建pdf，如下所示：

JasperExportManager.exportReportToPdfFile(jasperPrint, OUTPUTFILENAME+".pdf");

谢谢...

777先生