操作Text

 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

 

//写入文件
 public void writeToFile(File file, String context, boolean isAppend)
   throws IOException {
  BufferedWriter bw = null;
  if (file.exists()) {
       file.createNewFile();
       file = new File(file.getPath());
  }
  FileWriter fw = new FileWriter(file, isAppend);
  bw = new BufferedWriter(fw);
  fw.write(context);
  fw.flush();
  fw.close();
 }

 

//读取文件内容

 public void readToBuffer(StringBuffer buffer, InputStream is)
   throws IOException {
  String line; // 用来保存每行读取的内容
  BufferedReader reader = new BufferedReader(new InputStreamReader(is));
  line = reader.readLine(); // 读取第一行
  while (line != null) { // 如果 line 为空说明读完了
     buffer.append(line); // 将读到的内容添加到 buffer 中
     buffer.append("/n"); // 添加换行符
     line = reader.readLine(); // 读取下一行
  }
 }

 public String getAll() {

  File file = new File(ServletActionContext.getServletContext()
    .getRealPath("test.txt"));
  // ---写入
  try {
   this.writeToFile(file, "a:a<br /> b:b<br />  c:c<br /> ", false);
   this.writeToFile(file, "a:AAAAA<br /> b:BBB", true);
  } catch (IOException e1) {
   // TODO Auto-generated catch block
   e1.printStackTrace();
  }

  // ---读取
  InputStream is = null;
  try {
   is = new FileInputStream(file.getPath());

   StringBuffer buffer = new StringBuffer();
   this.readToBuffer(buffer, is);

   response.getWriter().println(buffer.toString());
   request.setAttribute("text", buffer.toString());
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } finally {
   try {
    if (null != is) {
     is.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  return SUCCESS;
 }

 

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