Java操作pdf: JarsperReport的简单使用

<!--jasper坐标-->
<dependency>
    <groupId>net.sf.jasperreports</groupId>
    <artifactId>jasperreports</artifactId>
    <version>6.5.0</version>
</dependency>
<dependency>
    <groupId>org.olap4j</groupId>
    <artifactId>olap4j</artifactId>
    <version>1.2.0</version>
</dependency>
<dependency>
    <groupId>com.lowagie</groupId>
    <artifactId>itext</artifactId>
    <version>2.1.7</version>
</dependency>

/**
 * 生成用户的采购表单
 * @param id
 */
@RequestMapping(value = "/userPdf",name = "下载用户采购单")
public void userPdf(String id) throws IOException, JRException {
    //1.读取jasper文件
    String realPath = session.getServletContext().getRealPath("/jasper/dintalk.jasper");
    InputStream in = new FileInputStream(realPath);
    //2.根据用户的id查询用户,将其转为Map
    User user = userService.findById(id);
    Map<String, Object> map = BeanMapUtils.beanToMap(user);
    //3.使用用户的id,查询所购商品信息
    ProductExample productExample = new ProductExample();
    productExample.createCriteria().andUserIdEqualTo(id);
    List<Product> Products = productService.findAll(productExample);
    //4.创建jrdatasource :数据源
    JRDataSource jrDataSource = new JRBeanCollectionDataSource(products);
    //5.创建pdf的输出对象,参数(模板输入流, map, 数据源 )
    JasperPrint jasperPrint = JasperFillManager.fillReport(in,map,jrDataSource);

    //==========设置pdf下载时的文件名称, 及解决文件名称中文乱码问题===============
    
    //6.设置页面下载文件名称
    String fileName = user.getName()+"采购单.pdf";
    //7.处理中文文件名乱码问题:根据user-agent获取浏览器类型
    fileName = DownloadUtil.getName(request.getHeader("user-agent"),fileName);
   
    //7.1 设置此响应头,则点击下载链接后直接完成下载
    //response.setHeader("Content-Disposition", "attachment;filename="+fileName);
    
    //7.2 设置此响应头,则点击后在浏览器预览(若链接有设置,可打开新页面),可再下载
    //response.setHeader("content-Disposition","filename="+fileName);
    
    //==========设置pdf下载时的文件名称, 及解决文件名称中文乱码问题===============
    
    //8.输出pdf
    JasperExportManager.exportReportToPdfStream(jasperPrint,response.getOutputStream());
    //9.关闭流
    in.close();
}

public static String getName(String agent, String filename) throws 
    UnsupportedEncodingException {
    
  if (agent.contains("Firefox")) {
    // 火狐浏览器
    BASE64Encoder base64Encoder = new BASE64Encoder();
    filename = "=?utf-8?B?" + base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
  } else {
    // 其它浏览器
    filename = URLEncoder.encode(filename, "utf-8");
  }
  return filename;
}

<script>
    function isIE(){
        //获取当前浏览器相关信息
        var explorer = window.navigator.userAgent.toLowerCase() ;
        //判断是否是ie浏览器
        if (explorer.indexOf("msie") >= 0 || explorer.indexOf("rv:11.0) like gecko") >=
            0)     {
            return true;
        }else {
            return false;
        }
    }
    //ww 是下载链接的id,使用时修改
    window.onload = function () {
        if(isIE()){
            //在是IE浏览器的情况下，对中文请求参数编码
            var str = document.getElementById("ww").href;
            str = encodeURI(str);
            document.getElementById("ww").href = str;
        }
    };
</script>

import org.springframework.cglib.beans.BeanMap;
import java.util.HashMap;
import java.util.Map;

public class BeanMapUtils {
    /**
     * 将对象属性转化为map结合
     */
    public static <T> Map<String, Object> beanToMap(T bean) {
        Map<String, Object> map = new HashMap<String, Object>();
        if (bean != null) {
            BeanMap beanMap = BeanMap.create(bean);
            for (Object key : beanMap.keySet()) {
                map.put(key+"", beanMap.get(key));
            }
        }
        return map;
    }