Question

我创建了一个java程序，它将比较两个文件，其中两个文件由新文件和旧文件组成。见下文：

new files --> new.txt 
postgresql-contrib-8.1.23-10.el5_10.x86_64.rpm
postgresql-devel-8.1.23-10.el5_10.i386.rpm
postgresql-devel-8.1.23-10.el5_10.x86_64.rpm
postgresql-docs-8.1.23-10.el5_10.x86_64.rpm
postgresql-libs-8.1.23-10.el5_10.i386.rpm
tzdata-2014b-1.el5.x86_64.rpm
tzdata-java-2014b-1.el5.x86_64.rpm
xalan-j2-2.7.0-6jpp.2.x86_64.rpm
xalan-j2-demo-2.7.0-6jpp.2.x86_64.rpm
xalan-j2-javadoc-2.7.0-6jpp.2.x86_64.rpm
xalan-j2-manual-2.7.0-6jpp.2.x86_64.rpm
xalan-j2-xsltc-2.7.0-6jpp.2.x86_64.rpm
xorg-x11-server-sdk-1.1.1-48.101.el5_10.3.x86_64.rpm
xorg-x11-server-Xdmx-1.1.1-48.101.el5_10.3.x86_64.rpm

old files --> old.txt
xalan-j2-2.6.0-6jpp.2.x86_64.rpm
xalan-j2-demo-2.6.0-6jpp.2.x86_64.rpm
xalan-j2-javadoc-2.6.0-6jpp.2.x86_64.rpm
xalan-j2-manual-2.6.0-6jpp.2.x86_64.rpm
xalan-j2-xsltc-2.6.0-6jpp.2.x86_64.rpm
xorg-x11-server-sdk-1.1.1-48.101.el5_10.3.x86_64.rpm
xorg-x11-server-Xdmx-1.1.1-48.101.el5_10.3.x86_64.rpm

对于上面给出的文件，我的问题是如何逐字符串地比较它是旧的，哪些是新的，然后删除旧版本，用新的替换它。必须删除所有旧文件并将其替换为所有新文件。

示例代码。它只是比较获取和删除文件尚未更新的文件。

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;


 public class Testing {

 public static void main(String[] args) throws IOException {
 BufferedReader bfr2 = new BufferedReader(new InputStreamReader(
       System.in));
 String s1 = "";
 String  s3 = "";
 String y = "", z = "";

 File file1 = new File("C:\\Users\\geno\\Desktop\\newfiles.txt");
 File file2 = new File("C:\\Users\\geno\\Desktop\\oldfiles.txt");
// File file1 = new File("C:\\Users\\geno\\Desktop\\changes.txt");
 //File file2 = new File("C:\\Users\\geno\\Desktop\\copy.txt");

  BufferedReader bfr = new BufferedReader(new FileReader(file1));
  BufferedReader bfr1 = new BufferedReader(new FileReader(file2));

  while ((z = bfr1.readLine()) != null)
    s3 += z;

 while ((y = bfr.readLine()) != null)
    s1 += y;

 System.out.println();

  System.out.println(s3);

  if (s3.equals(s1)) {
   System.out.println("Content of both files are same");
  } else {

   System.out.println("Content of both files are not same");

 }

 }

}`

使用Java比较新文件和旧文件

0 个答案: