java中读取文件,用readline()读怎么会有的行读不到?

=============程序代码 try{ BufferedReader br=new BufferedReader(new FileReader("C:\\Documents and Settings\\Administrator\\桌面\\FusionCharts_Evaluation\\Gallery\\Data\\StMSCol2D.xml")); StringBuffer xmlstr=new StringBuffer(); // System.out.println(br.readLine()); while(br.ready()){ System.out.println(br.readLine()); xmlstr.append(br.readLine()); } br.close(); //System.out.println(xmlstr.toString()); }catch(Exception e){ } ============== 程序执行结果 <chart palette='3' caption='Break-up of Annual Revenue' subcaption='In Million $' xaxisname='Year' Yaxisname='Sales in M$' numdivlines='3' numberPrefix='$' numberSuffix='M' showSum='1' useRoundEdges='1' legendBorderAlpha='0'> <category label='2001'/> <category label='2003'/> <category label='2005'/> <dataset> <set value='30' /> <set value='29' /> <set value='34' /> <dataSet seriesName='Product B' color='F6BD0F' showValues='0'> <set value='28' /> <set value='41' /> </dataSet> <dataSet> <set value='27' /> <set value='28' /> <set value='10' /> <dataset seriesname='Service B' color='A66EDD' showValues='0'> <set value='15' /> <set value='16' /> </dataset> <set value='12' /> <set value='16' /> <set value='12' /> </dataSet> ======================文件内容 <chart palette='3' caption='Break-up of Annual Revenue' subcaption='In Million $' xaxisname='Year' Yaxisname='Sales in M$' numdivlines='3' numberPrefix='$' numberSuffix='M' showSum='1' useRoundEdges='1' legendBorderAlpha='0'> <categories font='Arial' fontSize='12' fontColor='000000'> <category label='2001'/> <category label='2002'/> <category label='2003'/> <category label='2004'/> <category label='2005'/> </categories> <dataset> <dataSet seriesName='Product A' color='AFD8F8' showValues='0'> <set value='30' /> <set value='26' /> <set value='29' /> <set value='31' /> <set value='34' /> </dataSet> <dataSet seriesName='Product B' color='F6BD0F' showValues='0'> <set value='21' /> <set value='28' /> <set value='39' /> <set value='41' /> <set value='24' /> </dataSet> </dataset> <dataSet> <dataset seriesname='Service A' color='8BBA00' showValues='0'> <set value='27' /> <set value='25' /> <set value='28' /> <set value='26' /> <set value='10' /> </dataset> <dataset seriesname='Service B' color='A66EDD' showValues='0'> <set value='17' /> <set value='15' /> <set value='18' /> <set value='16' /> <set value='10' /> </dataset> <dataset seriesname='Service C' color='F984A1' showValues='0'> <set value='12' /> <set value='17' /> <set value='16' /> <set value='15' /> <set value='12' /> </dataset> </dataSet> </chart> ======================== 怎么会有的行读不到啊

答案：while(br.ready()){
	System.out.println(br.readLine());
	xmlstr.append(br.readLine());
}
每出现一次br.redLine()它就读一行，你这个循环里面写了两次，它就执行了两次
System.out.println(br.readLine());
执行了第一行
xmlstr.append(br.readLine());
执行了第二行
再循环System.out.println(br.readLine());执行的是第三行


你可以这样写
while(br.ready()){
                String string = br.readLine();
	System.out.println(string);
	xmlstr.append(string);
}

其他：这段代码有问题：
while(br.ready()){
	System.out.println(br.readLine());//这里读取了一行，
	xmlstr.append(br.readLine());//这里又读取了一行
}

应改为：
if(br.ready()){
    String tmp=null;
    while((tmp=br.readLine())!=null){
       System.out.println(tmp);
       xmlstr.append(tmp);
    }
} while(br.ready()){
				System.out.println(br.readLine());
				xmlstr.append(br.readLine());
			}

你这个地方用br.readLine()读了两次，但是只把第一次读的内容给显示了出来。 xmlstr.append(br.readLine());
将此行注释掉就行了