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java修改文件内容

 
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在实际应用中遇到一个问题，把从网上看到的代码复制到本地进行运行，但网上代码有很多数字标号，需要去掉，

 

package com.homeblog.servlet;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SessionServlet extends HttpServlet {

	private static final long serialVersionUID = -2352337186490910243L;

    /**
	 * 
	 */
public void doGet (HttpServletRequest req, HttpServletResponse res)
  48:       throws ServletException, IOException
  49:	    {
  50:    //Get the session object
  51:    HttpSession session = req.getSession(true);
  52:    
  53:    // set content type and other response header fields first
  54:    res.setContentType("text/html");
  55:    
  56:    // then write the data of the response
  57:    PrintWriter out = res.getWriter();
  58:    
  59:    out.println("<HEAD><TITLE> " + "SessionServlet Output " +
  60:                "</TITLE></HEAD><BODY>");
  61:    out.println("<h1> SessionServlet Output </h1>");
  62:    
  63:    // Retrieve the count value from the session
  64:    Integer ival = (Integer) session.getAttribute("sessiontest.counter");
  65:    
  66:    if (ival==null) 
  67:      ival = new Integer(1);
  68:    else 
  69:      ival = new Integer(ival.intValue() + 1);
  70:    
  71:    session.setAttribute("sessiontest.counter", ival);
  72:    
  73:    out.println("You have hit this page <b>" + ival + "</b> times.<p>");
  74:    out.println("Click <a href=" + res.encodeURL("session") +
  75:                ">here</a>");
  76:    out.println(" to ensure that session tracking is working even " +
  77:                "if cookies aren't supported.<br>");
  78:    out.println("Note that by default URL rewriting is not enabled " +
  79:                "due to it's expensive overhead");
  80:    out.println("<p>");
  81:    
  82:    out.println("<h3>Request and Session Data:</h3>");
  83:    out.println("Session ID in Request: " +
  84:                req.getRequestedSessionId());
  85:    out.println("<br>Session ID in Request from Cookie: " +
  86:                req.isRequestedSessionIdFromCookie());
  87:    out.println("<br>Session ID in Request from URL: " +
  88:                req.isRequestedSessionIdFromURL());
  89:    out.println("<br>Valid Session ID: " +
  90:                req.isRequestedSessionIdValid());
  91:    out.println("<h3>Session Data:</h3>");
  92:    out.println("New Session: " + session.isNew());
  93:    out.println("<br>Session ID: " + session.getId());
  94:    out.println("<br>Creation Time: " + session.getCreationTime());
  95:    out.println("<br>Last Accessed Time: " +
  96:                session.getLastAccessedTime());
  97:    
  98:    out.println("</BODY>");
  99:  }
 100:  
 101:	    public String getServletInfo() {
 102:    return "A simple servlet";
 103:  }

 

就像这样，需要把标号和：去掉，写了一个类来去除

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/**
 * 文件操作类：去除文件中的特殊字符
 * @author jiangzhiqiang
 */
public class FileEdit {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		FileReader fr = new FileReader("D://work//hblog//src//com//homeblog//servlet//SessionServlet.java");
		BufferedReader br = new BufferedReader(fr);
		
		String s;
		StringBuilder sb = new StringBuilder();
		while((s=br.readLine())!=null){
			for(int i=48;i<104;i++){
				String st = i + ":";
				if(s.contains(st)){
					s = s.replace(st, "");
				}
			}
			sb.append(s);
			sb.append("\r");
		}
		br.close();
		System.out.println(sb.toString());
		
		FileWriter fw = new FileWriter("D://work//hblog//src//com//homeblog//servlet//SessionServlet.java");
		BufferedWriter bw = new BufferedWriter(fw);
		bw.write(sb.toString());
		bw.flush();
		
		bw.close();
		
	}

}

 这个类可以把从48到103之间的数字+：的组合符号去掉。 如果是其他的数字范围，就修改成相应的数字范围就行。

 

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