jasper简单使用

1. 下载古老的IReport报表编辑器。
   链接：https://community.jaspersoft.com/project/ireport-designer/releases，最后打包时间为2014年5月，最终版本停留在v5.6.0。
2. 由于IReport最高支持jdk7，所以一般会启动失败，推荐下载7u80，便可顺利启动：

编辑配置文件：【D:\iReport-4.5.1\etc下的ireport.conf】追加一行【jdkhome="D:\Program Files\Java\jdk1.7.0_80"】。

3. 准备编译与反编译：
   maven-pom.xml：

<dependency>
    <groupId>net.sf.jasperreports</groupId>
    <artifactId>jasperreports</artifactId>
    <version>4.7.0</version>
</dependency>

代码：

package comg.yang.httpstest.controller;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.engine.xml.JRXmlWriter;

import java.io.File;

/**
 * @description:
 * @author: Yang JX
 * @since: 2021/8/14
 */
public class JasperCompile {

    public static void main(String[] args) throws Exception {
        compile();
        decompile();
    }

    /**
     * 从jrxml编译为jasper
     *
     * @throws JRException
     */
    public static void compile() throws JRException {
        JasperCompileManager.compileReportToFile(
                "/Users/rr/Desktop/goooo/shuYe/printSendMedCfqSy.jrxml",
                "/Users/rr/Desktop/goooo/shuYe/printSendMedCfqSy.jasper"
        );
    }

    /**
     * 从jasper反编译为jrxml
     *
     * @throws JRException
     */
    public static void decompile() throws JRException {
        String sourcePath = "/Users/rr/Desktop/goooo/printSendMedCfqSyChild.jasper";
        File file = new File(sourcePath);
        JasperReport report = (JasperReport) JRLoader.loadObject(file);

        String destinationPath = "/Users/rr/Desktop/goooo/printSendMedCfqSyChild.jrxml";
        JRXmlWriter.writeReport(report, destinationPath, "UTF-8");
    }

}