终结解决方案之最：struts2整合jasperreport再现图片无法显示
关于如题问题，今日做了最终汇总，并email值apache mail list：http://www.quicktopic.com/43/H/RNEjXQFBJHX
所有问题的内容如下：
Recently,I meet some problems during using "struts2-jasperreport-plugin-2.1.6", which includes:
A. undisplaying common report using the format of html and excel(pdf,good),because of the px image;
B. after resolving the problem A,there is annother problem which is undisplaying chart-report using the format of html(excel and pdf ,good),because of the img_0_0_0 image;
C. after revoling the problem B,there is also one problem which is laying over char-rpoert when one request needs to return at least two chart-reports;
D. single datasource for report;
Above of all the problems except for D have been resovled by myself,I don't know whether these problems belong to bugs,and I just email these problems to some help to others. Resovling method as followings (I apologize for untranslating my mother tongue to english for sharing):
ver 0:原始的struts2-jasperreport-plugin
解决问题：普通报表HTML、Excel格式浏览存在px图片无法显示；
问题原因：sturts2默认的后缀扩展时action，是在struts2-core-xxxxx.jar的org.apache.struts2下的default.properties中定义的，正常情况下是
struts.action.extension=action
而在struts2.1.6中，却是struts.action.extension=action,,
如此的配置使得struts2的拦截器除了拦截后缀为action的url及uri外，还额外拦截任何没有后缀的url及uri，那些不期待被拦截的咚咚也被
拦截去找相应的action了，致使产生了此问题
解决方案：1、在struts.xml中加<constant name="struts.action.extension" value="action"/>
2、在webroot根目录下建立一个images目录，放入px
ver 1:
解决问题：图形报表HTML无法显示；
解决方法：强制报表images到磁盘，即修改插件，添加代码，代码片段如下：
public class JasperReportsResult extends StrutsResultSupport implements JasperReportConstants {
// 省略 ...
protected void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
// 省略...
} else if (format.equals(FORMAT_HTML)) {
response.setContentType("text/html");
// IMAGES_MAPS seems to be only supported as "backward compatible" from JasperReports 1.1.0
Map imagesMap = new HashMap();
request.getSession(true).setAttribute("IMAGES_MAP", imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
//<--begin added by twolf, 200900902
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR_NAME, request.getRealPath(File.separator) + imageServletUrl);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
//end added by twolf -->
// Needed to support chart images:
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
request.getSession().setAttribute("net.sf.jasperreports.j2ee.jasper_print", jasperPrint);
} else if (format.equals(FORMAT_XLS)) {
// 省略...
// Will throw ServletException on IOException.
writeReport(response, output);
}
// 省略 ...
}
ver 2:
解决问题:图形报表一次请求返回多张时存在报表覆盖异常现象
解决方法:散列请求报表存放位置，消除覆盖异常现象
public class JasperReportsResult extends StrutsResultSupport implements JasperReportConstants {
// 省略 ...
protected void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
// 省略...
} else if (format.equals(FORMAT_HTML)) {
response.setContentType("text/html");
// IMAGES_MAPS seems to be only supported as "backward compatible" from JasperReports 1.1.0
Map imagesMap = new HashMap();
request.getSession(true).setAttribute("IMAGES_MAP", imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
//<--begin added by twolf, 200900902
//屏蔽JRHtmlExporterParameter.IMAGES_URI
//exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
String xDir = "img" + finalLocation.hashCode(); //构造报表存放子目录，以期解决一次请求返回多个图形报表重叠现象
String imgServDirUrl = imageServletUrl + xDir + "/";
File imgRealDir= new File(request.getRealPath(File.separator) + imgServDirUrl);
if(!imgRealDir.exists()) {
imgRealDir.mkdirs();
}
//重设JRHtmlExporterParameter.IMAGES_URI
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imgServDirUrl);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR, imgRealDir);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
//end added by twolf -->
// Needed to support chart images:
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
request.getSession().setAttribute("net.sf.jasperreports.j2ee.jasper_print", jasperPrint);
} else if (format.equals(FORMAT_XLS)) {
// 省略...
// Will throw ServletException on IOException.
writeReport(response, output);
}
// 省略 ...
}
=============以上版本要求在webroot目录下存在images目录，而以下则无需，因会自动创建==========
ver 3：
解决问题:同ver 2，做了改进，配置rptAlone参数决定一次请求返回是否多于一张图形报表，默认一次请求返回一张图形报表
解决方法:增加配置参数，修改JasperReportConstants.java及JasperReportsResult.java
在JasperReportConstants.java中增加
//<begin added by twolf 20090902
//标识一次请求返回报表是否孤单，呵呵
public static final String CHART_RPT_ALONE = "Y";
public static final String CHART_RPT_NONALONE = "N";
// end added by twolf 20090902>
在JasperReportsResult.java修改：
添加：
//<begin added by twolf,20090203
protected String rptAlone;
public String getRptAlone() {
return rptAlone;
}
public void setRptAlone(String rptAlone) {
this.rptAlone = rptAlone;
}
//end added by twolf,20090203>
在initializeProperties方法中添加：
//<begin added by twolf,20090203
rptAlone = conditionalParse(rptAlone, invocation);
if (!TextUtils.stringSet(rptAlone)) {
rptAlone = CHART_RPT_ALONE;
}
//end added by twolf,20090203>
在doExecute方法中，修改：
else if (format.equals(FORMAT_HTML)) {
response.setContentType("text/html");
// IMAGES_MAPS seems to be only supported as "backward compatible" from JasperReports 1.1.0
Map imagesMap = new HashMap();
request.getSession(true).setAttribute("IMAGES_MAP", imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
//<--begin added by twolf, 20090203
//屏蔽JRHtmlExporterParameter.IMAGES_URI
//exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
String xDir;
String imgServDirUrl;
if(CHART_RPT_ALONE.equalsIgnoreCase(rptAlone)) {
xDir = "img" + "_pub";
} else {
xDir = "img" + finalLocation.hashCode(); //构造报表存放子目录，以解决一次请求返回多个图形报表覆盖现象
}
imgServDirUrl = imageServletUrl + xDir + "/";
File imgRealDir = new File(request.getRealPath(File.separator) + imgServDirUrl);
if(!imgRealDir.exists()) {
imgRealDir.mkdirs();
}
//重设JRHtmlExporterParameter.IMAGES_URI
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imgServDirUrl);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR, imgRealDir);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
//end added by twolf,20090203 -->
// Needed to support chart images:
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
request.getSession().setAttribute("net.sf.jasperreports.j2ee.jasper_print", jasperPrint);
} else if (format.equals(FORMAT_XLS)) {
ver 4:
解决问题:支持多数据源
解决方法:处理中
There is some problem in diplaying my mother tongue,so you could see http://redsnow-fenglin.iteye.com/blog/461927 ,which is the paper on my blog.
...
I am amazed by the unexpected phenomenon,which it does not work in ver 3 when rptAlone is set JasperReportConstants.CHART_RPT_ALONE,and I doubt file stream's problem, so I change the code again, which as followinigs:
ver 3.1
解决问题:在ver 3中，当rptAlone为JasperReportConstants.CHART_RPT_ALONE时，报表图片路径正确，却不可显示，怀疑文件流关闭问题
解决方法:从新修改代码，如下：
} else if (format.equals(FORMAT_HTML)) {
response.setContentType("text/html");
// IMAGES_MAPS seems to be only supported as "backward compatible" from JasperReports 1.1.0
Map imagesMap = new HashMap();
request.getSession(true).setAttribute("IMAGES_MAP", imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
//<--begin added by twolf, 20090203
//屏蔽JRHtmlExporterParameter.IMAGES_URI
//exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
if(CHART_RPT_ALONE.equalsIgnoreCase(rptAlone)) {
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR_NAME, request.getRealPath(File.separator) + imageServletUrl);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
} else {
String xDir = "img" + finalLocation.hashCode(); //构造报表存放子目录，以解决一次请求返回多个图形报表覆盖现象
String imgServDirUrl = imageServletUrl + xDir + "/";
File imgRealDir = new File(request.getRealPath(File.separator) + imgServDirUrl);
if(!imgRealDir.exists()) {
imgRealDir.mkdirs();
}
//重设JRHtmlExporterParameter.IMAGES_URI
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imgServDirUrl);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_DIR, imgRealDir);
exporter.setParameter(JRHtmlExporterParameter.IS_OUTPUT_IMAGES_TO_DIR, Boolean.TRUE);
}
//end added by twolf,20090203 -->
// Needed to support chart images:
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
request.getSession().setAttribute("net.sf.jasperreports.j2ee.jasper_print", jasperPrint);
} else if (format.equals(FORMAT_XLS)) {
It does work very well now.
源码下载地址：http://redsnow-fenglin.iteye.com/blog/508715
同步blog http://hi.baidu.com/fenglinquan/blog/item/386103fa91604817a9d3112d.html
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