JasperReport學習筆記3-在瀏覽器生成PDF文件

在瀏覽器生成PDF文件，主要用了JasperRunManager對象面的runReportToPdfStream方法，在WEB裏一般都先用iReport生成jasper文件，這樣就去解析JRXML文件了 

例子如下 

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

public class JasperReportServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //獲得輸出流
        ServletOutputStream outputStream = response.getOutputStream();
        //獲得輸入流
        InputStream inputStream = getServletConfig().getServletContext().getResourceAsStream("JasperFile//JasperReportFile.jasper");
        try {

            //生成網頁的PDF文件
            JasperRunManager.runReportToPdfStream(inputStream, outputStream, new HashMap(), new JREmptyDataSource());
            //設置PDF格式
            response.setContentType("application/pdf");
            outputStream.flush();
            outputStream.close();
        } catch (JRException e) {
            StringWriter stringWriter = new StringWriter();
            PrintWriter printWriter = new PrintWriter(stringWriter);
            e.printStackTrace(printWriter);
            response.setContentType("text/plain");
            response.getOutputStream().print(stringWriter.toString());
        }
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);
    }
}