Java向文件写数据的3种方式_java怎么把数据输入进文件里

Java向文件写数据的3种方式

下边列举出了三种向文件中写入数据的方式，当然还有其他方式，帮助自己理解文件写入类的继承关系。类的关系：
file->fileoutputstream->outputstreamWriter(FileWriter继承outputstreamWriter对象)
测试代码：

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

/**
 * 测试向文件中写文件
 * 
 * @author lenovo
 * 
 */
public class TestWirteFile {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        String sContent = "2015年的双十一真的是非常火爆!";
        String sDestFile = "F:/myWrite.txt";
        File destFile = new File(sDestFile);
        if (!destFile.exists()) {
            destFile.createNewFile();
        }

        // 1.向文件写入内容
        // writeByFileWrite(sDestFile, sContent);

        // 2.FileOutputStream向文件写入内容
        // writeByFileWrite(sDestFile, sContent);

        // 2.OutputStreamWriter向文件写入内容
        writeByOutputStreamWrite(sDestFile, sContent);
    }

    /**
     * 用FileWrite向文件写入内容
     * 
     * @param _destFile
     * @throws IOException
     */
    public static void writeByFileWrite(String _sDestFile, String _sContent)
            throws IOException {
        FileWriter fw = null;
        try {
            fw = new FileWriter(_sDestFile);
            fw.write(_sContent);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            if (fw != null) {
                fw.close();
                fw = null;
            }
        }
    }

    /**
     * 用FileOutputStream向文件写入内容
     * 
     * @param _destFile
     * @throws IOException
     */
    public static void writeByFileOutputStream(String _sDestFile,
            String _sContent) throws IOException {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(_sDestFile);
            fos.write(_sContent.getBytes());
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            if (fos != null) {
                fos.close();
                fos = null;
            }
        }
    }

    /**
     * 用OutputStreamWrite向文件写入内容
     * 
     * @param _destFile
     * @throws IOException
     */
    public static void writeByOutputStreamWrite(String _sDestFile,
            String _sContent) throws IOException {
        OutputStreamWriter os = null;
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(_sDestFile);
            os = new OutputStreamWriter(fos, "UTF-8");
            os.write(_sContent);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
                os = null;
            }
            if (fos != null) {
                fos.close();
                fos = null;
            }

        }
    }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110