JSP中捕获 OUT 输出的例子

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

在CSDN里面看了一篇关于将动态JSP内容保存为静态页面的文章,忘记网址了,大家可以搜索一下 :)

他没有提供源代码,然后自己测试着写了一个.

主要想法是捕获 out 的输出后,可以保存到一些静态文件中,可以写一个 JSP的缓冲程序.

代码有待完善, 希望有这方面经验的朋友来共同完善.

在RESIN环境中测试成功,没有在tomcat其他服务器下测试,还存在一个问题,就是不能够同时输出到IE浏览器中.

?

以下为程序代码, 例如保存到 test.jsp 文件中,然后在IE中执行

http://....../test.jsp

将看不到任何输出,但是可以在后台resin的DOS窗口中看到输出的内容

<%@ page language="java" contentType="text/html;charset=gb2312"%>

<%@ page import="java.io.*"%>

<%@ page import="java.util.*"%>

<%!

//继承 JspWriter 类

class MyOut extends JspWriter

{

private HttpServletResponse response;

//将输出语句都存入os中

public CharArrayWriter os;

public MyOut()

{

super(0, false);

os = new CharArrayWriter();

}

public String getString() {

return os.toString();

}

public final void write(byte buf[], int off, int len)

throws IOException

{

os.write( new String(buf, off, len) );

}

public final void write(char buf[], int off, int len)

throws IOException

{

os.write( new String(buf, off, len) );

}

public final void write(int ch)

throws IOException

{

os.write( String.valueOf(ch) );

}

public final void write(char buf[])

throws IOException

{

os.write( String.valueOf(buf) );

}

public final void write(String s)

throws IOException

{

os.write( s );

}

public final void write(String s, int off, int len)

throws IOException

{

os.write( s, off, len );

}

public final void newLine()

throws IOException

{

os.write( "\n\r" );

}

public final void print(boolean b)

throws IOException

{

os.write( String.valueOf(b) );

}

public final void print(char ch)

throws IOException

{

os.write( String.valueOf(ch) );

}

public final void print(int i)

throws IOException

{

os.write( String.valueOf(i) );

}

public final void print(long l)

throws IOException

{

os.write( String.valueOf(l) );

}

public final void print(float f)

throws IOException

{

os.write( String.valueOf(f) );

}

public final void print(double d)

throws IOException

{

os.write( String.valueOf(d) );

}

public final void print(char s[])

throws IOException

{

os.write( String.valueOf(s) );

}

public final void print(String s)

throws IOException

{

os.write( s );

}

public final void print(Object o)

throws IOException

{

os.write( String.valueOf(o) );

}

public final void println()

throws IOException

{

os.write( "\n\r" );

}

public final void println(boolean b)

throws IOException

{

os.write( String.valueOf(b) );

}

public final void println(char ch)

throws IOException

{

os.write( String.valueOf(ch) );

}

public final void println(int i)

throws IOException

{

os.write( String.valueOf(i) );

}

public final void println(long l)

throws IOException

{

os.write( String.valueOf(l) );

}

public final void println(float f)

throws IOException

{

os.write( String.valueOf(f) );

}

public final void println(double d)

throws IOException

{

os.write( String.valueOf(d) );

}

public final void println(char s[])

throws IOException

{

os.write(s, 0, s.length);

}

public final void println(String s)

throws IOException

{

os.write(s);

}

public final void println(Object o)

throws IOException

{

os.write( String.valueOf(o) );

}

public final void clear()

throws IOException

{

os.reset();

}

public final void flush()

throws IOException

{

os.flush();

}

public void clearBuffer() {

os.reset();

}

public ServletOutputStream getOutputStream()

throws java.io.IOException

{

return response.getOutputStream();

}

//执行该方法可以将内容输出,或者保存为文件

public final void close()

throws IOException

{

System.out.println( "以下为静态输出" );

System.out.println( os.toString() );

}

public final int getBufferSize()

{

if(bufferSize == 0)

return bufferSize;

else

return response.getBufferSize();

}

public final int getRemaining()

{

return os.size();

}

public final boolean isAutoFlush()

{

return autoFlush;

}

}

%>

<%

out = new MyOut();

out.println( "开始输出, 在浏览器将会什么都不到<BR>" );

%>

<html>

<head>

<body>

<%

out.println( "文件内容" );

%>

</body>

</head>

</html>

<%

out.close();

%>

 
 
 
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