使用POJO作为iReport数据源

问题描述

我有一个POJO，可以将来自各种来源的数据编译成单个对象。该对象使用单个参数进行实例化。示例：

I have a POJO that compiles data from various sources into a single object. The object is instantiated with a single parameter. Example:

Invoice inv=new Invoice(1239);

这将带回一份完整的发票，其中包含填充了各种来源数据的其他POJO（例如结算）和送货地址为地址对象）。

This will bring back a complete invoice containing other POJOs populated with data from various sources (such as the billing and shipping addresses as Address objects).

我可以在iReport中将其用作数据源吗？

Can I use this as a data source within iReport?

推荐答案

您可以尝试使用 JRMapCollectionDataSource 从中构建数据源收集。

You could try use a JRMapCollectionDataSource from which you can build a DataSource from a collection.

您可以从POJO对象中获取值，并在可能的情况下将它们放入集合中。

You could take the values from the POJO object and place them into a collection if possible.

以下是构建数据源的示例代码。

Here is some sample code for constructing a DataSource.

Collection<Map<String, Object>> myColl = new ArrayList<Map<String,Object>>();

Map<String, Object> map1 = new HashMap<String, Object>();
map1.put("Field1","Value1");
map1.put("Field2","Value2");
map1.put("Field3", someObject);
myColl.add(map1);

JRMapCollectionDataSource source = new JRMapCollectionDataSource(myColl);

另一种选择是通过实现 JRRewindableDataSource 或 JRDataSource 。

Another option would be to create a custom datasource by implementing JRRewindableDataSource or JRDataSource.

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