我试图将一个图像添加到我的jasperReport中,但是它不能工作,当它调用:
JasperRunManager.runReportToPdf ....我将数据库中的图像设置为BLOB类型,在"file.jrxml“中将其设置为
字段-> IMAGE_FILE
FIELDCLASS > oracle.sql.blob.
和图像属性:
图像表示-> $F{IMAGE_FILE}.getBinaryStream()
表达式类-> java.lang.String
消息错误:
12:22:24,863 INFO [STDOUT] 12:22:24,862 ERROR [JRFillSubreport] Fill 1: exception
net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression :
Source text : $F{IMAGE_FILE}.getBinaryStream()
...
...
Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'oracle.sql.BLOB@5d17f1ea' with class 'oracle.sql.BLOB' to class 'oracle.sql.BLOB'
at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:360)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:599)
...
...
12:22:24,863 ERROR [STDERR] net.sf.jasperreports.engine.JRRuntimeException: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression :
Source text : $F{IMAGE_FILE}.getBinaryStream()因此,主要错误无法解决,也找不到原因:
12:22:24,868 ERROR [STDERR] Caused by: net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression :
Source text : $F{IMAGE_FILE}.getBinaryStream()
12:22:24,869 ERROR [STDERR] Caused by: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'oracle.sql.BLOB@5d17f1ea' with class 'oracle.sql.BLOB' to class 'oracle.sql.BLOB'发布于 2016-12-21 13:33:03
我找到答案了。只需修改这两个值,现在就可以工作了:
* field : IMAGE_FILE
* field Class : oracle.sql.inputStream和新的图像属性:
*image expresion : $F{IMAGE_FILE}
*expression class : java.lang.Stringhttps://stackoverflow.com/questions/41261837
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