java IO操作--读写文本文件

1、一行一行的读取文本内容

String temp=null;
	        StringBuffer content=new StringBuffer();//StringBuffer类和String一样，也用来代表字符串。区别：偏重于对于字符串的变化，例如追加、插入和删除
	        //下面两种方法都行。
	        BufferedReader read=new BufferedReader(new InputStreamReader(new  FileInputStream("E:/bioasqB/result/1.out")));
	  //    BufferedReader read=new BufferedReader(new FileReader("E:/bioasqB/result/1.out"));
		    while((temp=read.readLine())!=null){
				content.append(temp);
				content.append("\n");
				System.out.println(temp);
			}

2、将整个内容写到文本

public static void FileWrite(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 = new FileWriter(fileName);//不追加文件内容
            writer.write(content);       
        } catch (IOException e) {     
            e.printStackTrace();     
        } finally {     
            try {     
                if(writer != null){  
                    writer.close();     
                }  
            } catch (IOException e) {     
                e.printStackTrace();     
            }     
        }   
    }

3、将字符串内容循环写到文本中

public String WriteTopic(ArrayList result) throws FileNotFoundException{
		Book book=new Book();
		String id=null;
		String body=null;
		String document=null;
		String qrel=null;
		for(int i=0;i<result.size();i++){
			Pattern p0=Pattern.compile("id=(.*?)bioasq");
			Matcher m0=p0.matcher(result.get(i).toString());
			while(m0.find()){
				id=m0.group(1);
				book.setId(id);
			}
			Pattern p1=Pattern.compile("body:\"(.*?)\"");
			Matcher m1=p1.matcher(result.get(i).toString());
			while(m1.find()){
				body=m1.group(1);
				book.setBody(body);
			}
			Pattern p2=Pattern.compile("\"http://www.ncbi.nlm.nih.gov/pubmed/(.*?)\"");
			Matcher m2=p2.matcher(result.get(i).toString());
			while(m2.find()){
				document=m2.group(1);
	//			book.setDocument(document);
				qrel=id+" "+"0"+" "+document+" "+"1";
				System.out.println(qrel);
				FileOutputStream fos=new FileOutputStream("C:\\Users\\Administrator\\Desktop\\BioASQ_2013_TaskB\\BioASQ_PhaseB.qrel",true);
				PrintStream ps=new PrintStream(fos);
				Scanner in=new Scanner(qrel);
				String s=in.next();
				System.setOut(ps);
		//		System.out.println(s);
			}
		}
		return qrel;
	}

BioASQ_PhaseB.qrel格式

1 0 23220349 1
1 0 19582169 1
1 0 22161322 1
1 0 18025684 1
1 0 15701682 1
1 0 15215406 1
1 0 18081932 1
1 0 18629289 1
1 0 21729286 1
1 0 11438739 1
1 0 10573422 1
2 0 22975810 1
2 0 22852678 1
2 0 22278059 1
2 0 21500720 1
2 0 23331310 1
2 0 23250067 1
2 0 23003992 1
2 0 22714377 1
2 0 22665786 1
2 0 22653729 1
2 0 22330507 1
2 0 22286383 1
2 0 21293374 1
3 0 22921312 1
3 0 22480152 1
3 0 22315491 1
3 0 22258533 1
3 0 21415082 1
3 0 21068339 1
3 0 20569258 1
4 0 23297037 1
4 0 22987359 1
4 0 22540951 1
4 0 22247276 1
......