1 import java.io.File;
2 import java.io.IOException;
3 import java.net.URL;
4 import java.util.ArrayList;
5 import java.util.Collection;
6 import java.util.List;
7
8 import org.apache.commons.io.FileUtils;
9 import org.apache.commons.io.IOUtils;
10 import org.apache.commons.io.LineIterator;
11 import org.apache.commons.io.filefilter.DirectoryFileFilter;
12 import org.apache.commons.io.filefilter.EmptyFileFilter;
13 import org.apache.commons.io.filefilter.FileFilterUtils;
14 import org.apache.commons.io.filefilter.SuffixFileFilter;
15
16 public class CommonDemo {
17 public static void main(String[] args) throws IOException {
18 /*
19 * 文件和文件夹的大小
20 */
21 long len=FileUtils.sizeOf(new File("src\\com\\hh\\CommonDemo.java"));
22 System.out.println(len);
23 len=FileUtils.sizeOf(new File("F:\\HolidayJavaStudy\\myDemo2"));
24 System.out.println(len);
25 /*
26 *按要求显示文件
27 */
28 Collection<File> files=FileUtils.listFiles(new File("F:\\HolidayJavaStudy\\myDemo2"), EmptyFileFilter.NOT_EMPTY, null);
29 for (File file : files) {
30 System.out.println(file.getAbsolutePath());
31 }
32 System.out.println("------------------------------");
33 files=FileUtils.listFiles(new File("F:\\HolidayJavaStudy\\myDemo2"), EmptyFileFilter.NOT_EMPTY, DirectoryFileFilter.INSTANCE);
34 for (File file : files) {
35 System.out.println(file.getAbsolutePath());
36 }
37 System.out.println("------------------------------");
38 files=FileUtils.listFiles(new File("F:\\HolidayJavaStudy\\myDemo2"),
39 FileFilterUtils.or(new SuffixFileFilter("java"),new SuffixFileFilter("class")), DirectoryFileFilter.INSTANCE);
40 for (File file : files) {
41 System.out.println(file.getAbsolutePath());
42 }
43 System.out.println("------------------------------");
44 files=FileUtils.listFiles(new File("F:\\HolidayJavaStudy\\myDemo2"),
45 FileFilterUtils.and(new SuffixFileFilter("java"),EmptyFileFilter.NOT_EMPTY), DirectoryFileFilter.INSTANCE);
46 for (File file : files) {
47 System.out.println(file.getAbsolutePath());
48 }
49 /*
50 * 读取文件
51
52 */
53 String msg=FileUtils.readFileToString(new File("emp.txt"), "GBK");
54 System.out.println(msg);
55 byte[] bys=FileUtils.readFileToByteArray(new File("emp.txt"));
56 System.out.println(bys.length);
57 //逐行读取
58 List<String> list=FileUtils.readLines(new File("emp.txt"),"GBK");
59 for (String string : list) {
60 System.out.println(string);
61 }
62 //使用迭代器
63 LineIterator it=FileUtils.lineIterator(new File("emp.txt"),"GBK");
64 while(it.hasNext()){
65 System.out.println(it.nextLine());
66 }
67
68 /*
69 * 写文件
70 */
71 FileUtils.write(new File("utf-8.txt"),"我尼玛", "UTF-8", true);
72 FileUtils.writeStringToFile(new File("utf-8.txt"),"我尼玛\r\n", "UTF-8", true);
73 FileUtils.writeByteArrayToFile(new File("utf-8.txt"), "q我尼玛\r\n".getBytes("UTF-8"), true);
74 //写出列表
75 List<String> strs=new ArrayList<String>();
76 strs.add("你好");
77 strs.add("你妈好");
78 strs.add("你八号");
79 FileUtils.writeLines(new File("utf-8.txt"),"UTF-8", strs, "--", true);
80
81 /*
82 * 拷贝
83 */
84 //复制文件
85 //FileUtils.copyFile(new File("***.jpg"), new File("file/***.jpg"));
86 //复制文件到目录(将文件复制到这个目录下)
87 //FileUtils.copyFileToDirectory(new File("***.jpg"), new File("file"));
88 //复制目录到目录(将源目录复制到目的目录，作为目的目录的子目录)
89 //FileUtils.copyDirectoryToDirectory(new File("file"), new File("file2"));
90 //复制目录(将源目录中的文件复制到目的目录)
91 //FileUtils.copyDirectory(new File("file"), new File("file2"));
92 //拷贝URL内容
93 /*String url="http://img.netbian.com/file/2020/0215/1ecf16ccc23b09f82f72f34a19da8632.jpg";
94 FileUtils.copyURLToFile(new URL(url), new File("file2/dali.jpg"));*/
95 String s1=IOUtils.toString(new URL("http://www.baidu.com"),"UTF-8");
96 String s2=IOUtils.toString(new URL("http://www.163.com"),"GBK");
97 System.out.println(s1);
98 System.out.println(s2);
99
100 }
101
102 }
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