Question

我用以前的类似答案努力解决这个问题，但我仍然无法看到我的问题，希望你能提供帮助。我的代码如下所示：

String MyContent =" ";
String nextline = " ";

InputStream in = new FileInputStream(f);

BufferedInputStream bin = new BufferedInputStream(in);

DataInputStream din = new DataInputStream(bin);

    while(din.available()>1)
    {
    nextline = din.readLine();

    //Filter out XML headers which are not browser compliant
    if (nextline.length > 4)
        {
        if (nextline.substring(1,5) != "<?xml")
            {
            MyContent=MyContent+ nextline;
            }
        }   
    }

    out.print (MyContent);

in.close();
bin.close();
din.close();

我收到了一个错误：

An error occurred at line: 25 in the jsp file: /MaxiSunReports/DisplayXMLFile.jsp
nextline.length cannot be resolved or is not a field
22:     nextline = din.readLine();
23:     nextline = "THISISATEST";
24:     //Filter out XML headers which are not browser compliant
25:     if (nextline.length > 4)
26:         {
27:         if (nextline.substring(1,5) != "<?xml")

Answer 1

首先，readLine()中的方法DataInputStream已弃用。

其次，此方法返回String，其中没有field length。它只有方法length()。 length是数组的属性。

Answer 2

length不是字段。这是一个功能，因此您必须致电nextline.length() > 4

Answer 3

长度不是属性，它是一种方法..

使用

while(din.available()>1)
{
nextline = din.readLine();

//Filter out XML headers which are not browser compliant
if (nextline.length() > 4)
    {
    if (nextline.substring(1,5) != "<?xml")
        {
        MyContent=MyContent+ nextline;
        }
    }   
}

.length无法解析或不是字段

3 个答案: