Java追加文件内容的三种方法

灰太狼 2022-04-06 12:13 264阅读 0赞

package com.bijian.test;
    
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.io.OutputStreamWriter;
    import java.io.RandomAccessFile;
    
    public class AppendFile {
    	
    	public static void method1(String file, String conent) {   
            BufferedWriter out = null;   
            try {   
                out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, true)));   
                out.write(conent);   
            } catch (Exception e) {   
                e.printStackTrace();   
            } finally {   
                try {   
                	if(out != null){
                		out.close();   
                    }
                } catch (IOException e) {   
                    e.printStackTrace();   
                }   
            }   
        }   
      
        /**  
         * 追加文件：使用FileWriter  
         *   
         * @param fileName  
         * @param content  
         */  
        public static void method2(String fileName, String content) { 
        	FileWriter writer = null;
            try {   
                // 打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件   
                writer = new FileWriter(fileName, true);   
                writer.write(content);     
            } catch (IOException e) {   
                e.printStackTrace();   
            } finally {   
                try {   
                	if(writer != null){
                		writer.close();   
                	}
                } catch (IOException e) {   
                    e.printStackTrace();   
                }   
            } 
        }   
      
        /**  
         * 追加文件：使用RandomAccessFile  
         *   
         * @param fileName 文件名  
         * @param content 追加的内容  
         */  
        public static void method3(String fileName, String content) { 
        	RandomAccessFile randomFile = null;
            try {   
                // 打开一个随机访问文件流，按读写方式   
                randomFile = new RandomAccessFile(fileName, "rw");   
                // 文件长度，字节数   
                long fileLength = randomFile.length();   
                // 将写文件指针移到文件尾。   
                randomFile.seek(fileLength);   
                randomFile.writeBytes(content);    
            } catch (IOException e) {   
                e.printStackTrace();   
            } finally{
            	if(randomFile != null){
            		try {
    					randomFile.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
            	}
            }
        }  
    
    	public static void main(String[] args) {
    		try{
    			File file = new File("d://text.txt");
    			if(file.createNewFile()){
    				System.out.println("Create file successed");
    			}
    			method1("d://text.txt", "111");
    			method2("d://text.txt", "222");
    			method3("d://text.txt", "333");
    		}catch(Exception e){
    			System.out.println(e);
    		}
    	}
    }

运行结束后，打开D盘下的test.txt文件，内容如下所示：

![477b23cd-16f0-32dd-a65c-a95adc473ca7.png][]

文章来源：[http://blog.csdn.net/malik76/article/details/6408726/][http_blog.csdn.net_malik76_article_details_6408726]

[477b23cd-16f0-32dd-a65c-a95adc473ca7.png]: /images/20220406/87d1ed61f3ec4459a56a0f8eed589822.png
[http_blog.csdn.net_malik76_article_details_6408726]: http://blog.csdn.net/malik76/article/details/6408726/