在iReport中的列表中创建子报表 [英] Creating Subreport within list in iReport

问题描述

我有一个目标列表，每个目标中都有另一个arraylist。我希望使用子报表显示子arraylist中的详细信息。我想为子arraylist中的每个对象都有一个子报告。

I have a list of goals, each of which have another arraylist in it. I want to have the details in the child arraylist to be displayed using a subreport. I would like to have a subreport for each of the objects in the child arraylist.

我面临的问题是，我似乎找不到办法将arraylist指定为子报表的数据源。在尝试创建数据源时，我无法选择构建列表的数据集的字段，只能选择主报表的字段。

The issue I am facing is that, I can't seem to find a way to specify the arraylist as data source for the subreport. When trying to create datasource, I can't select fields of the dataset on which the list is built, only the fields of the main report can be selected.

是否可以在iReport中执行此操作。我已经坚持了很长一段时间了。任何帮助表示赞赏。 ：）

Is it possible to do this in iReport.? I am stuck with this for quite some time now. Any help is appreciated. :)

推荐答案

根据给出的信息，这将是答案。

With information given this would be the answer.

主bean （你的目标？），包含其他bean的 List （ SubBean ） 。

Main bean (your goals?), containing List of other bean (SubBean).

public class Bean {
  private String var1;
  private List<SubBean> subBeans;
  public String getVar1() {
    return var1;
  }
  public void setVar1(String var1) {
    this.var1 = var1;
  }
  public List<SubBean> getSubBeans() {
    return subBeans;
  }
  public void setSubBeans(List<SubBean> subBean) {
    this.subBeans = subBean;
  }
}

子bean

public class SubBean {
  private String var2;
  public SubBean(String var2){
    this.var2 = var2;
  }
  public String getVar2() {
    return var2;
  }
  public void setVar2(String var2) {
    this.var2 = var2;
  }
}

如何将SubBean列表传递给a子报告。

1. 您需要主报告中的字段subBeans。

1. You need the field subBeans in you main report.

<field name="subBeans" class="java.util.List"/>

我建议您将.jasper文件的位置作为参数传递（注意jasper报告需要绝对路径）。在主报告中

I suggest that you pass the location of the .jasper file as a parameter (Note jasper report needs absolute path) es. in main report

<parameter name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false"/>

并在java中传递它（在示例sub中）工作目录中的文件夹jasper是subreport.jasper的位置。

and in java pass it (in example sub folder "jasper" in working directory is the location of the subreport.jasper)

paramMap.put("SUBREPORT_DIR", new File("jasper").getAbsolutePath() + File.separator);

1. 现在只需打电话给你的子报告（需要从这样的主报告中加入.jasper。

1. Now just call your subreport (needs to be complied into .jasper) from main report like this.

<subreport>
  <reportElement x="105" y="4" width="400" height="100"/>
  <dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{subBeans})]]></dataSourceExpression>
  <subreportExpression class="java.lang.String"><![CDATA[$P{SUBREPORT_DIR} + "subreport.jasper"]]></subreportExpression>
</subreport>

因此：

我正在创建一个新的 JRDataSource 子报告在当前 Bean <中传递 List SubBean / code>

I'm creating a new JRDataSource for the sub report passing the List of SubBean in the current Bean

new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{subBeans})

表示已编译的subreport.jasper的绝对位置

indicating the absolute location of the compiled subreport.jasper

$P{SUBREPORT_DIR} + "subreport.jasper"

所以现在你的子报告中你可以使用 SubBean 的字段： var2 ，只需在此定义如下： subreport.jrxml

so now in your subreport you can use the field: var2 of the SubBean, just define it like this in the subreport.jrxml

<field name="var2" class="java.lang.String"/>

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