JasperReport大小限制 [英] JasperReport size limit
本文介绍了JasperReport大小限制的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有没有办法设置JasperReport的大小限制?我们刚看了一下WebSphere 6.1 Heapdump,有人试图创建一个报告,堆中有1.5GB的内存。它让我们的Websphere服务器瘫痪了。
谢谢,
T
Is there a way to set a limit on the size of a JasperReport? We just looked at a WebSphere 6.1 Heapdump and someone tried to create a report and it was 1.5GB of memory in the heap. And it brought our Websphere server to its knees. Thanks, T
推荐答案
我不熟悉JasperReports,但你可以 wrap您的I / O流以确保读/写的数据量不超过定义的限制。
I'm not familiar with JasperReports, but you could wrap your I/O streams to ensure that the amount of data read/written does not exceed a defined limit.
OutputStream 示例:
public class LimitedSizeOutputStream extends OutputStream {
private final OutputStream delegate;
private final long limit;
private long written = 0L;
/**
* Creates a stream wrapper that will throw an IOException if the write
* limit is exceeded.
*
* @param delegate
* the underlying stream
* @param limit
* the maximum number of bytes this stream will accept
*/
public LimitedSizeOutputStream(OutputStream delegate, long limit) {
this.delegate = delegate;
this.limit = limit;
}
private void checkLimit(long byteCount) throws IOException {
if (byteCount + written > limit) {
throw new IOException("Exceeded stream size limit");
}
written += byteCount;
}
@Override
public void write(int b) throws IOException {
checkLimit(1);
delegate.write(b);
}
@Override
public void write(byte[] b) throws IOException {
checkLimit(b.length);
delegate.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
checkLimit(len);
delegate.write(b, off, len);
}
@Override
public void close() throws IOException {
delegate.close();
}
}
包装同样容易 InputStream 。
这篇关于JasperReport大小限制的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文