Question

如何将Glassfish服务器输出重定向到HttpServletResponse.out？我在NetBeans中制作servlet。

Answer 1

这是一个工作示例，只是将其公开为servlet

public class ReadLogs extends HttpServlet {

    private static final String CONTENT_TYPE = "text/html; charset=UTF-8";

    public void init(ServletConfig config) throws ServletException {
        super.init(config);
    }

    public void service(HttpServletRequest request,
            HttpServletResponse response) throws ServletException,
            IOException {
        response.setContentType(CONTENT_TYPE);
        PrintWriter out = response.getWriter();
        out.append("<html>\n<head>\n\n");
        out.append("<script>function toBottom()" + "{"
                + "window.scrollTo(0, document.body.scrollHeight);" + "}");
        out.append("\n</script>");
        out.append("\n</head>\n<body onload=\"toBottom();\">\n<pre>\n");
        try {
            File file = new File("C:\\pathToServerLogFile");
            BufferedReader in = new BufferedReader(new FileReader(file));
            StringBuilder sb = new StringBuilder();
            while (in.ready()) {
                String x = in.readLine();
                sb.append(x).append("<br/>");
            }
            in.close();
            out.append("\n</pre>\n</body>\n</html>");
            out.close();
        } catch (FileNotFoundException fnfe) {
            fnfe.printStackTrace();
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}

<强>更新

如果您只需要打印文件的最后一部分，请在“in.close（）;”

行之后使用

      //print only 1MB Oof data
      if(sb.length()>1000000){
        out.append(sb.substring(sb.length()-1000000, sb.length()));
      }else{
        out.append(sb.toString());
      }

Answer 2

所以..只打印调用脚本后出现的行我已经制作了这样的代码：

BufferedReader reader = new BufferedReader(new FileReader("/path/to/server/log/server.log"));
int lines = 0;
while (reader.readLine() != null) {
    lines++;
}

reader.close();

BufferedReader reader2 = new BufferedReader(new FileReader("/path/to/server/log/server.log"));
String strLine;
int i = 0;
while (i != lines) {
   reader2.readLine();
   i++;

}
while ((strLine = reader2.readLine()) != null) {
    out.println(stringToHTMLString(strLine));
    out.println("<br>");
}

reader2.close();

当servlet启动时，它会对服务器日志中的行进行计数（将其保存在变量i中），然后在单击操作表单后，读取索引高于i的行并在html页面上显示。我使用了函数stringToHTMLString，我在stackoverflow上找到了它。

电贺。

将Glassfish输出写入servlet html页面

2 个答案: