javaweb中的路径访问

下面的图片是目录

java文件的普通类访问方式，如代码所示

package com.itcast.demo6;

 

import java.io.FileInputStream;

 

public class Readfile {

public static void main(String[] args) throws Exception {

String filename1 = "1.txt";

readfile(filename1);

String filename2 = "src/2.txt";

readfile(filename2);

String filename3 = "WebRoot/3.txt";

readfile(filename3);

String filename4 = "WebRoot/WEB-INF/4.txt";

readfile(filename4);

}

 

public static void readfile(String filename) throws Exception {

FileInputStream fs = new FileInputStream(filename);

byte[] b = new byte[1024];

int a;

while ((a = fs.read(b)) != -1) {

String str = new String(b, 0, a);

System.out.println(str);

}

fs.close();

}

}

javaweb的访问路径如代码所示：

package com.itcast.demo6;

import java.io.FileInputStream;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ReadfileServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// 1.txt没有发布，所以不能访问

String filename3 = "/3.txt";

filename3 = this.getServletContext().getRealPath(filename3);

String filename2 = "/WEB-INF/classes/2.txt";

filename2 = this.getServletContext().getRealPath(filename2);

String filename1 = "/WEB-INF/4.txt";

filename1 = this.getServletContext().getRealPath(filename1);

try {

readfile(filename1);

} catch (Exception e) {

e.printStackTrace();

}

}

public static void readfile(String filename) throws Exception {

FileInputStream fs = new FileInputStream(filename);

byte[] b = new byte[1024];

int a;

while ((a = fs.read(b)) != -1) {

String str = new String(b, 0, a);

System.out.println(str);

}

fs.close();

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}