readfile.jsp

采用JSP + Ajax + 文本来演示多选、全选

<%
/***********/
/* Author : JarryLi 
/* Blog:http://jiarry.blogchina.com
/***********/
%>
<%@ page import="java.util.*"%>
<%@ page import="java.lang.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.servlet.jsp.*" %>
<%@ page import="javax.servlet.http.* "%>
<%@ page import="java.io.*" %>
<%@ page import="java.nio.*" %>
<%@ page import="java.nio.channels.*" %>
<%@ page import="java.lang.Object.*" %>

<%!
	//返回得到的文件内容,如果文件编码是UTF-8
	//根据传入的encoding把UTF-8转码成GBK;
public String readContent(String fn , String encoding ){
	//return the file all contents;
 String content=""; String inLine=null;
 
 if(encoding == null || encoding.length() <=0 )encoding = "GBK";
 //默认从UTF-8转为GB2312;
 
	try{			    
		//创建新的BufferedReader对象
		BufferedReader readfile = new BufferedReader( new FileReader( fn ) );
		inLine = readfile.readLine();
		while ( inLine != null) {
		    //content += inLine; 
			  content += (inLine + System.getProperty("line.separator"));
			  inLine = readfile.readLine();
			}
		 content = new String(content.getBytes(encoding),"UTF-8") ;
	  }catch (IOException e){
		    //out.print("读取数据错误.");
	}
		return content;
}

public String readContents(String fn){
	//返回得到的文件
	//return the file all contents;
 String content=""; String inLine=null;
	try{	
		    
   // ByteArrayOutputStream out1 = new ByteArrayOutputStream();            
   // FileInputStream fin = new FileInputStream(filename);
   // BufferedReader in = new BufferedReader(new InputStreamReader(fin,"UTF-8"));   //这里指定编码 
   
		//创建新的BufferedReader对象
		BufferedReader readfile = new BufferedReader( new FileReader( fn ) );
		inLine = readfile.readLine();
		while ( inLine != null) {
		    //content += inLine; 
			  content += (inLine + System.getProperty("line.separator"));
			  inLine = readfile.readLine();
			}
	  }catch (IOException e){	}
		return content;
}

//return the line count function;
private int lineCount( String thefile){
	//thefile is a text file;
	//count the file's rows;
	   int rowCount = 0; String rowline = null;
	   try{
	   	BufferedReader readfn = new BufferedReader( new FileReader(thefile) );
	   	while( (rowline = readfn.readLine()) != null ){
	   		   rowCount++;
	   		}	   	
	  }catch(IOException e){
	      //out.print("异常:"+e.getMessage())
	  }
	  return rowCount;
}


//return success or failed;
private String writeContent( String content ,  String fn){
	//write content in fn;
	
	//直接写入，不做排他;
	try{
		  PrintWriter pw = new PrintWriter( new FileOutputStream(fn) );//声明写入
	    pw.print(content);    
	    pw.close();//close PrintWriter对象  
	    return "success";//writeln successfull;
    }catch(IOException e) {
      return "failed";
    }

    /*
    //写入文件时锁定,以避免两个同时写入的操作情况;
    try {
        File file = new File(fn);
        //FileChannel channel = new RandomAccessFile(file, "rw").getChannel();
        FileLock lock = channel.lock();
        try {
         // lock = channel.tryLock();//锁定;
          
				  PrintWriter pw = new PrintWriter( new FileOutputStream(fn) );//声明写入
			    pw.print(content);    
			    pw.close();//close PrintWriter对象  
			    return "success";//writeln successfull;
		            
         }catch (OverlappingFileLockException e) {
        
            
        }
        lock.release();
        // Close the file
        channel.close();
    } catch (Exception e) {
 
    }
       return "failed";
  */
}





//转义js字符
private String turnScript(String temStr){
	try{
      	  temStr = temStr.replaceAll("\\\\","\\\\\\\\");  // 转换\
      	  temStr = temStr.replaceAll("\"","\\\\\"");      // 转换"
      	  temStr = temStr.replaceAll("'","\\\\'");        // 转换'
      	  temStr = temStr.replaceAll("\r","<br/>");       // 转换回车
      	  temStr = temStr.replaceAll("\n","<br/>");       // 转换换行符
    }catch(Exception e) {
      //return "failed";
    }	
    return temStr;
}

//返回文件里指定的某行内容;
private String readContentLine(String fn , int no){
 String content=""; String inLine=null;	int rowCount = 0; 
	try{	    
		//创建新的BufferedReader对象
		BufferedReader readfile = new BufferedReader( new FileReader( fn ) );
		inLine = readfile.readLine();
		while ( inLine != null) {

			  rowCount ++;
		      //content += inLine; 
			   if(rowCount == no){
			     content = (inLine + System.getProperty("line.separator"));
			   }

			  inLine = readfile.readLine();
			}
	  }catch (IOException e){
		    //out.print("读取数据错误.");
	}
	return content;

}

//返回文件除某行之外的内容;
private String readContentNoTheLine(String fn , int no){
 String content=""; String inLine=null;	int rowCount = 0; 
	try{	    
		//创建新的BufferedReader对象
		BufferedReader readfile = new BufferedReader( new FileReader( fn ) );
		while ( (inLine = readfile.readLine())  != null) {
			   rowCount ++;
			   if(rowCount != no){
				   content += (inLine + System.getProperty("line.separator"));
			   }
			}
	  }catch (IOException e){
		    //out.print("读取数据错误.");
	}
	return content;
}

//返回rowNum 是否与arraylist数组里的某个值相同;
private boolean isDeleteRow(String[] arraylist , int rowNum){
	//如果提定的行号与数组里的任何一个行号相同返回true;
	//说明是要要删除的行号;
	 for(int x=0; x< arraylist.length;x++){
        if( rowNum == Integer.parseInt(arraylist[x]) )
        return true;//比较当前行号与数据里的行号
	  }
	 return false;
}

//return true or false,
//check the string is not number;
public boolean isNum(String str){
        if(str.length() <= 0 )return false;
        boolean num = true;       
        for(int i=0; i< str.length();i++){          
             if( str.charAt(i) < '0' || str.charAt(i) > '9'){
                num = false;
           }
        }   
	return num;
}

//如果后台操作程序不是采用utf-8编码,如GBK;采用utf-8则不用转码,支持utf-8哦
//form GET方式提交过来的字符串是unicode编码;
//那么读取中文字符时需要转码成GBK;
//return Chinese char
public String getStrCn(String str)
{
     try{
        String temp_p=str;
        byte[] temp_t=temp_p.getBytes("ISO-8859-1");
        String temp=new String(temp_t,"GBK");
        return temp;
    }catch(Exception e){    }
    return "null";
}


//如果后台操作程序不是采用utf-8编码,如GBK;采用utf-8则不用转码,支持utf-8哦
//js提交(xmlhttp GET)过来的encodeURIComponent(String)字符串是utf-8编码;
//那么传递中文字符时需要转码成utf-8保存;
public String decodeUTF(String str)
{
    try{
        String temp_p = java.net.URLDecoder.decode(str);
				String temp = new String(temp_p.getBytes("ISO-8859-1"),"UTF-8");
        return temp;
    }catch(Exception e){    }
    return "null";
}

//decodeGBK
public String decodeGBK(String str)
{
    try{
        String temp_p = java.net.URLDecoder.decode(str);
				String temp = new String(temp_p.getBytes("ISO-8859-1"),"GBK");
        return temp;
    }catch(Exception e){    }
    return "null";
}

//如果后台不是UTF-8编码，比如是GBK;
//如果采用xmlhttp POST方式传值,需要把传来的值从GBK转换成UTF-8;
public String GBKtoUTF(String str)
{
    try{        
				String temp = new String(str.getBytes("GBK"),"UTF-8");
        return temp;
    }catch(Exception e){    }
    return "null";
}

//如果后台不是UTF-8编码，比如是GBK;
//如果采用xmlhttp POST方式传值,需要把传来的值从UTF-8转换成GBK;
public String UTFtoGBK(String str)
{
    try{        
				String temp = new String(str.getBytes("UTF-8"),"GBK");
        return temp;
    }catch(Exception e){    }
    return "null";
}

//本函数可以写在Bean里，本例为了说明Ajax的应用，故直接写在页面
//return file contents function;
// jsp:include page="../inc/readfile.jsp" /
// %@ include file="../inc/readfile.jsp"  %

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