访问传递给jasper记录的唯一Java bean [英] Accessing the only Java bean passed to jasper records

问题描述

我需要使用 JasperReports 创建PDF文件。问题是它只需要一个Java bean作为参数（不是列表也不是数组），并且报表具有无法在表或列表中表达的自定义布局。如果我执行以下代码，当jrxml只有布局而没有打印参数时 - PDF显示OK。这是我尝试传递参数的方式：

I need to create a PDF file using JasperReports. The problem is that it has to take only one Java bean as a parameter (not list nor array) and the report has custom layout that can not be expressed in tables or lists or whatever. If I execute the following code, when jrxml has only layout and no printing of the parameters - PDF displays OK. This is how I try to pass a parameter:

Map<String, Object> map = new HashMap<String, Object>();
url = getClass().getClassLoader().getResource("/WEB-INF/reports/reg.jrxml");
jasperReport = JasperCompileManager.compileReport(url.getPath());
map.put("PARAM_NAME", myBean);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, 
    map, new JREmptyDataSource());
JasperExportManager.exportReportToPdfStream(jasperPrint, responseOutputStream);

问题是，如何配置我的jrxml文件，以便我可以访问<$的字段c $ c> myBean ，以便我可以填写文本字段？我尝试添加

The question is, how should I configure my jrxml file so that I have access to fields of myBean, so that I can fill in text fields? I have tried adding

<parameter name="PARAM_NAME" class="net.sf.jasperreports.engine.JRDataSource"/>

到jrxml文件，但我仍然无法访问它的字段。比如说， myBean 有一个字段 uid 和 getUid（）相应的，我需要在某处打印。

to jrxml file but I still can't access it's fields. Say, myBean has a field uid and getUid() correspondingly and I need to print it somewhere.

推荐答案

不知道为什么我从一开始就不能这样做。 ..将Java代码的部分更改为：

Don't know why I couldn't do this from the very beginning... Changed parts of Java code to:

List<IBClientBean> data = new ArrayList<MyBean>();
data.add(myBean);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, 
    new HashMap<String, Object>(), new JRBeanCollectionDataSource(data));

并在声明属性后立即手动添加到jrxml文件的开头（而不是我尝试过的）添加问题）：

and added manually to the beginning of jrxml file, right after declaration of properties (instead of what I tried to add in the question):

<field name="uid" class="java.lang.String"/>

等等。然后我就可以打印 uid 到pdf，只需在文本字段中输入 $ F {uid} 。

and so on for all required fields in MyBean. Then I was able to print uid to pdf simply typing $F{uid} inside of Text Field.

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