怎么在文本文件中添加字符串 java

如何在文本文件中添加字符串 java

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String htmlName="index.html";String relaPath=""Writer out = null;String path = ServletActionContext.getServletContext().getRealPath("/");File fileName = new File(path + relaPath+"index.html");try {out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName, true), "utf-8"));out.write("追加的东西");out.flush();out.close();} catch (Exception e) {e.printStackTrace();}

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Java代码



1.
可以先把文件里面的东西读出来,放在StringBuffer里面,然后在追加 ??

??? 如:

    File?f=new?File;?    try??    { ??    InputStream?a?=?new?FileInputStream(f); ??    BufferedReader?ins?=?new?BufferedReader(new?InputStreamReader(a));     StringBuffer?buffer?=?new?StringBuffer(); ??    String?line?=?""; ??    while?((line?=?ins.readLine())?!=?null) ??    { ??    buffer.append(line); ??    System.out.println(buffer.toString()); ??    } ??    buffer.append("后面的"); ??    FileOutputStream?out?=?new?FileOutputStream(f); ??    out.write(buffer.toString().getBytes()); ??    } ??    catch(Exception?e) ??    { ??    e.printStackTrace(); ??    }???

2.

Java代码 File f=new File("D:/a.txt");try{FileOutputStream out = new FileOutputStream(f,true);out.write("something".getBytes());}catch(Exception e){e.printStackTrace();}

3.
FileOutputStream接收两个参数,后面个boolean决定是追加还是覆盖


Java代码

PrintWriter?out?=?new?PrintWriter(new?BufferedWriter( ??    ????????????????????new?FileWriter(rcFile,?true)),?true); ??    out.println(sb.toString()); ?

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??? 第一个true代表append，第二个代表autoflush??

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