IO流整理
package com.test.reader;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
public class ReaderDemo
{
public static void main(String[] args)
{
Reader r = null;
// try
// {
// r = new FileReader(Thread.currentThread().getContextClassLoader().getResource("com/test/reader/1.txt").getFile());
// }
// catch (FileNotFoundException e)
// {
// e.printStackTrace();
// }
//文件中的内容跟字符串s中的内容是一样的
String s = "wepftwgpempgdsg/ngmepgm;sgf/ns,gf'dsmgfd;smgfd/n,;sdfm ng;df/nmg;sdgf;/n";
r = new StringReader(s);
BufferedReader reader = new BufferedReader(r);
StringBuffer sb = new StringBuffer();
String line;
try
{
line = reader.readLine();
while(null != line)
{
sb.append(line);
line = reader.readLine();
sb.append("/n");
}
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (null != r)
{
try
{
r.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if (null != reader)
{
try
{
reader.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
System.out.println(sb.toString());
}
}
package com.test.writer;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
public class WriterDemo
{
public static void main(String[] args)
{
// Writer w = new StringWriter();
// try
// {
// w.write("wefowge", 2, 5);
// System.out.println(w.toString());
// }
// catch (IOException e)
// {
// e.printStackTrace();
// }
//文件读取写入
Reader r = null;
try
{
r = new FileReader(Thread.currentThread().getContextClassLoader().getResource("com/test/reader/1.txt").getFile());
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
// BufferedReader reader = new BufferedReader(r);
Writer fw = null;
try
{
fw = new FileWriter("d:/2.txt");
}
catch (IOException e)
{
e.printStackTrace();
}
BufferedWriter bw = new BufferedWriter(fw);
try
{
// String line = reader.readLine();
// while (null != line)
// {
// bw.write(line);
// bw.newLine();
// line = reader.readLine();
//
// }
char[] ch = new char[13];
int n = 0;
while ((n = r.read(ch, 0, 13)) != -1)
{
bw.flush();
bw.write(ch, 0, n);
if (n == 13)
{
ch = new char[13];
}
}
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (null != r)
{
try
{
r.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if (bw != null)
{
try
{
bw.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
}
package com.test.stream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
public class StreamDemo
{
public static void main(String[] args)
{
// InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("com/test/stream/1.txt");
File inputFile = new File("d:/1.txt");
File outputFile = new File("d:/2.txt");
InputStream is = null;
OutputStream os = null;
try
{
is = new FileInputStream(inputFile);
//字节输入流转为字符输入流
InputStreamReader reader = new InputStreamReader(is);
os = new FileOutputStream(outputFile);
// 字节输出流转换为字符输出流
OutputStreamWriter writer = new OutputStreamWriter(os);
int n = 0;
while ((n = is.read()) != -1)
{
os.write(n);
}
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
if (null != is)
{
try
{
is.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
if (null != os)
{
try
{
os.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
}
}
下面一段是使用Servlet向页面使用流的方式输出内容
/**
* 只输出不跳转，文件中的内容只会输出到浏览器上，并不能跳转
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// doPost(request, response);
ServletOutputStream os = response.getOutputStream();
InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream("com/test/1.txt");
byte[] b = new byte[10];
int n = 0;
while ((n = is.read(b, 0, 10)) != -1)
{
os.write(b, 0, n);
if (n == 10)
{
b = new byte[10];
}
}
os.close();
is.close();
}
//这种方式在页面上可以使用小脚本对流中的内容进行读取
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Writer writer = response.getWriter();
writer.write("abcd");
writer.close();
if (!response.isCommitted())
{
request.getRequestDispatcher("result.jsp").forward(request, response);
}
return;
}
调用post方式时，可以使用小脚本在页面上获取流信息
<%
StringBuffer sb = new StringBuffer();
BufferedReader reader = request.getReader();
String str = reader.readLine();
while (null != str)
{
sb.append(str);
str = reader.readLine();
}
reader.close();
%>
----------------------------------------------------------
<%=sb.toString() %>