如何使用 jsp include 在应用程序（战争）之外包含文件

Question

我正在使用“jsp:include”在我的一个 jsp 文件中包含一个静态文件。当静态 html 文件位于应用程序文件夹中时，它可以正常工作。但是，如果它保存在应用程序文件夹之外，则它不会包含在 JSP 文件中。

注意：我已经为保存静态文件的文件夹创建了一个上下文，我可以使用直接 url 查看 html 文件。

请帮忙..

Answer 1

我已经使用 c:import 标签解决了这个问题。

为了定义动态 URL，我使用了 bean:define 标记。感谢朋友的建议和帮助。

Answer 2

您只能将 jsp:include 用于 Web 应用程序上下文中的资源。您将需要使用java.io.File 或类似名称从文件系统路径加载，或使用ClassLoader.getResource 从类路径加载资源。

Answer 3

<c:import> 方法的另一个好处是您可以使用charEncoding 属性设置编码。 您不能使用 <%@include%> 或 <jsp:include> 语句来执行此操作。

Answer 4

看到这个JSP Include directive example

Answer 5

我使用了一个类，该类具有从 URL 获取内容的方法： 例如：http://link.inet.vn/seo-website/inet.html

public class URLReader
{
    public URLReader()
    {
        in = null;
        out = null;
        requestType = null;
        headers = null;
        content = null;
        headers = new Hashtable();
    }

    public void doGet(String server, String uri, int port)
    {
        try{
            Socket client = new Socket(server, port);
            client.setKeepAlive(true);
            in = new DataInputStream(client.getInputStream());
            out = new DataOutputStream(client.getOutputStream());
            out.writeBytes("GET " + uri + " HTTP/1.0\r\n");
            out.writeBytes("Host: " + server + "\r\n");
            out.writeBytes("Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n");
            out.writeBytes("Accept-Language: en-us\r\n");
            out.writeBytes("Accept-Encoding: gzip, deflate\r\n");
            out.writeBytes("User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)\r\n");
            out.writeBytes("Connection: Keep-Alive\r\n");
            out.writeBytes("Content-Length: 0\r\n\r\n");
            out.flush();
            parseRequest();
            out.close();
            in.close();
            client.close();        
        }catch(Exception e){
            System.out.println(e.getMessage());
        }

        return;
    }

    public byte[] getContent()
    {
        return content;
    }

    public String getHeader(String name)
    {
        String key = (String)headers.get(name);
        return key;
    }

    public Hashtable getHeaders()
    {
        return headers;
    }

    public String getRequestType()
    {
        return requestType;
    }

    public static void main(String args[]) throws IOException
    {
        URLReader reader = new URLReader();

        reader.doGet("link.inet.vn", "/seo-website/inet.html", 80);
        if(reader.getContent() != null)
            System.out.println(new String(reader.getContent(),"UTF-8"));

    }

    private boolean parseRequest()
    {
        byte match[];
        int index;
        String line;
        match = (new byte[] {
            13, 10, 13, 10
        });
        index = 0;
        line = "";
        int i;
        try{
            while((i = in.read()) >= 0) 
            {
                if(i == match[index] && index <= 3)
                    index++;
                else
                    index = 0;
                if(index == 4)
                {
                    content = readHTTPContent();
                    break;
                }
                line = line + (char)i;
                if(line.length() > 2 && i == 10)
                {
                    int pos = line.indexOf(':');
                    if(pos != -1)
                    {
                        String name = line.substring(0, pos);
                        String value = line.substring(pos + 1, line.length()).trim();
                        setHeader(name, value);
                    } else
                    {
                        setRequestType(line.substring(0, line.length()).trim());
                    }
                    line = "";
                }
            }

            return true;
        }catch(Exception e){
            System.out.println(e.getMessage());
            return false;
        }                
    }

    private byte[] readHTTPContent()
        throws IOException
    {
        ByteArrayOutputStream baosContent = new ByteArrayOutputStream();
        int contentLength = 0;
        try {
            contentLength = Integer.parseInt( (String) headers.get("content-length"));
        } catch (Exception ex) {
            contentLength = 1024 * 1024;
        }
        int bytesToRead = 0;
        int bytesRead   = 0;
        int totalBytesRead = 0;
        int bufferSize = 1024;
        byte[] buffer = new byte[bufferSize];

        if (contentLength < bufferSize) {
            bytesToRead = contentLength;
        } else {
            bytesToRead = bufferSize;
        }
        do {
            try {
                bytesRead = in.read(buffer, 0, bytesToRead);
            } catch (InterruptedIOException e) {
                /* comms read timeout expired, no problem */
                System.out.println("Timeout reading from socket");
            }
            if (bytesRead == -1) {
                in.close();
               // throw new IOException("Connection was closed by client.");
                break;
            } else if (bytesRead > 0) {
                //////////////////////////////////////
                baosContent.write(buffer, 0, bytesRead);
                //////////////////////////////////////
                totalBytesRead += bytesRead;
            }
            // Left bytes to read
            if (contentLength - totalBytesRead > bufferSize) {
                bytesToRead = bufferSize;
            } else {
                bytesToRead = contentLength - totalBytesRead;
            }
        } while (totalBytesRead < contentLength);

        return baosContent.toByteArray();        
    }


    public void saveToFile(byte data[], String filename)
    {
        try{
            File f = new File(filename);
            FileOutputStream fout = new FileOutputStream(f);
            fout.write(data);
            fout.close();
        }catch(Exception e){
            System.out.println(e.getMessage());
        }        
        return;
    }


    private void setHeader(String key, String value)
    {
        headers.put(key.toLowerCase(), value);
    }

    private void setRequestType(String s)
    {
        requestType = new String(s);
    }

    private byte content[];
    private Hashtable headers;
    private DataInputStream in;
    private DataOutputStream out;
    private String requestType;
}

Answer 6

只是出于兴趣 - 想要这样做的原因是什么？ - 可能有另一种方法。

我怀疑您想要一些独立于 WAR 文件的配置，并且对于部署 WAR 的每个环境都是唯一的。