Java追加文件内容的三种方法_JAVA_编程开发_程序员俱乐部

class="java">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 buffAppend(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();   
            }   
        }   
    }   
  
   
    public static void fileAppend(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();   
            }   
        } 
    }   
  
 
    public static void randomAppend(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();
				}
        	}
        }
    }  

}