一个简单的基于MVC结构的，JSP+Servlet+JavaBean实现文本文件增删改查功能的

package reWeb; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.util.StringTokenizer; import java.util.Vector; public class AddJavaBean { private String id; private String name; private String author; private String isbn; private String introduction; private int tb=8; public int getTb(){ return this.tb; } public void setTb(int tb){ this.tb=tb; } public String getId(){ return this.id; } public String getName(){ return this.name; } public String getAuthor(){ return this.author; } public String getIsbn(){ return this.isbn; } public String getIntroduction(){ return this.introduction; } public void setId(String id){ this.id=id; } public void setName(String name){ this.name=name; } public void setAuthor(String author){ this.author=author; } public void setIsbn(String isbn){ this.isbn=isbn; } public void setIntroduction(String introduction){ this.introduction=introduction; } public void add(){ PrintWriter pw=null; String addMessage=new String(this.id+","+this.name+","+this.author+","+this.isbn+","+this.introduction); try{ pw = new PrintWriter(new FileOutputStream("d:\\date.txt",true)); pw.println(addMessage); pw.flush(); pw.close(); } catch(Exception e){ pw.close(); } } public void search(String str) throws IOException{ BufferedReader br=null; String d=null; try{ br=new BufferedReader(new InputStreamReader(new FileInputStream("d:\\date.txt"))); while((d=br.readLine())!=null){ String[] sp=d.split(","); if(str.equals(sp[0])){ this.name=sp[1]; this.author=sp[2]; this.isbn=sp[3]; this.introduction=sp[4]; this.tb=0; break; } else{this.tb=-1;} } br.close(); } catch(Exception e){ br.close(); } } public void delete() throws IOException //每次调用delete都生成一个临时文本文件 { File file=new File("d:\\date.txt"); File file2=null; //try{ // File f = new File("D:" + File.separatorChar); // f.mkdir(); //file2=File.createTempFile("ddd",".txt",f); file2=new File("d:\\tt.txt"); // }catch(IllegalArgumentException e){ //}catch(SecurityException e){} //catch(IOException e){} //创建一个文本文件并赋值为file2 PrintWriter pw=null; BufferedReader br=null; String[] astr=new String[5]; String d=null; try { br=new BufferedReader(new InputStreamReader(new FileInputStream(file))); pw = new PrintWriter(new FileOutputStream(file2),true); while((d=br.readLine())!=null){ astr=d.split(","); if(!id.equals(astr[0])){ System.out.println(id+astr[0]); //pw = new PrintWriter(new FileOutputStream(file2),true); pw.println(d); // pw.flush(); } } br.close(); pw.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block pw.close(); br.close(); } file.delete(); file2.renameTo(file); } }