java简单贴吧代码 贴吧里的代码怎么用?

求一段简单的java代码

不知道是否理解对了你的意思,大概写了一下:

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import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.StringReader;

import java.io.StringWriter;

public class FileReadAndWrite {

private static final int DEFAULT_BUFFER_SIZE = 1024;

public static void main(String[] args) {

File file = new File("E:/workspace/FileIOTest/src/a.txt");

String str = file2String(file, "UTF-8");

str = str.replace('d', 'f');

string2File(str,"E:/workspace/FileIOTest/src/b.txt");

System.out.println("处理完毕");

}

/**

* 文本文件转换为指定编码的字符串

*

* @param file

* 文本文件

* @param encoding

* 编码类型

* @return 转换后的字符串

* @throws IOException

*/

public static String file2String(File file, String encoding) {

InputStreamReader reader = null;

StringWriter writer = new StringWriter();

try {

if (encoding == null || "".equals(encoding.trim())) {

reader = new InputStreamReader(new FileInputStream(file),

encoding);

} else {

reader = new InputStreamReader(new FileInputStream(file));

}

// 将输入流写入输出流

char[] buffer = new char[DEFAULT_BUFFER_SIZE];

int n = 0;

while (-1 != (n = reader.read(buffer))) {

writer.write(buffer, 0, n);

}

} catch (Exception e) {

e.printStackTrace();

return null;

} finally {

if (reader != null)

try {

reader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

// 返回转换结果

if (writer != null)

return writer.toString();

else

return null;

}

/**

* 将字符串写入指定文件(当指定的父路径中文件夹不存在时,会最大限度去创建,以保证保存成功!)

*

* @param res

* 原字符串

* @param filePath

* 文件路径

* @return 成功标记

*/

public static boolean string2File(String res, String filePath) {

boolean flag = true;

BufferedReader bufferedReader = null;

BufferedWriter bufferedWriter = null;

try {

File distFile = new File(filePath);

if (!distFile.getParentFile().exists())

distFile.getParentFile().mkdirs();

bufferedReader = new BufferedReader(new StringReader(res));

bufferedWriter = new BufferedWriter(new FileWriter(distFile));

char buf[] = new char[1024]; // 字符缓冲区

int len;

while ((len = bufferedReader.read(buf)) != -1) {

bufferedWriter.write(buf, 0, len);

}

bufferedWriter.flush();

bufferedReader.close();

bufferedWriter.close();

} catch (IOException e) {

e.printStackTrace();

flag = false;

return flag;

} finally {

if (bufferedReader != null) {

try {

bufferedReader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return flag;

}

}

给段最简单的java代码 让我新手看一下

最简单的java代码肯定就是这个了,如下:

public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

“hello world”就是应该是所有学java的新手看的第一个代码了。如果是零基础的新手朋友们可以来我们的java实验班试听,有免费的试听课程帮助学习java必备基础知识,有助教老师为零基础的人提供个人学习方案,学习完成后有考评团进行专业测试,帮助测评学员是否适合继续学习java,15天内免费帮助来报名体验实验班的新手快速入门java,更好的学习java!

求一个简单的java代码

public class Message {

public static void main(String[] args){

String name;

int age;

System.out.println("请输入姓名,回车结束:"); //提示输入

Scanner sc = new Scanner(System.in);

name = sc.nextLine(); //为变量赋值

System.out.println("请输入年龄,回车结束:");

age = sc.nextInt();

System.out.println("姓名:"+name+"\n年龄:"+age); //打印姓名及年龄

}

}

//不知道这样行么?

类似百度贴吧的搜索方式java如何实现?

数据少的话 模糊查找,多的话,用lucene

建立索引,从索引里面搜索。

索引搜索是这么做的:

package method;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.document.Document;

import org.apache.lucene.document.Field;

import org.apache.lucene.index.CorruptIndexException;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.queryParser.ParseException;

import org.apache.lucene.queryParser.QueryParser;

import org.apache.lucene.search.Hits;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

import org.apache.lucene.store.LockObtainFailedException;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import pojo.user;

import Interface.dao;

public class CreateAndUse extends HibernateDaoSupport implements dao{

private static String INDEX_PATH = "D:/use/";//索引路径

public void create(){

Listuser list = getHibernateTemplate().find("from user");

try{

IndexWriter writer = new IndexWriter(CreateAndUse.INDEX_PATH, new StandardAnalyzer(),true);

for(int i=0;ilist.size();i++){

Document doc = new Document();

Field f1 = new Field("id",String.valueOf(list.get(i).getId()),Field.Store.YES,Field.Index.UN_TOKENIZED);

Field f2 = new Field("username",list.get(i).getUsername(),Field.Store.YES,Field.Index.UN_TOKENIZED);

Field f3 = new Field("password",list.get(i).getPassword(),Field.Store.YES,Field.Index.TOKENIZED);

doc.add(f1);

doc.add(f2);

doc.add(f3);

writer.addDocument(doc);

}

writer.close();

}catch(Exception e){

e.printStackTrace();

}

}

public Listuser search(String str,String type) throws CorruptIndexException, IOException, ParseException{

Listuser list = new ArrayList();

user u = null;

IndexSearcher index = new IndexSearcher(INDEX_PATH);

QueryParser q = new QueryParser(type,new StandardAnalyzer());

q.setDefaultOperator(QueryParser.AND_OPERATOR);

Query query = q.parse(str);

Hits hits = index.search(query);

// System.out.println("hits的长度为:"+hits.length());

for(int i = 0;i hits.length();i++){

u = new user();

u.setCount(hits.length());

u.setId(Integer.parseInt(hits.doc(i).get("id")));

u.setUsername(hits.doc(i).get("username"));

u.setPassword(hits.doc(i).get("password"));

list.add(u);

}

return list;

}

}

lucene是个java的搜索库,你要自己下载配置一下这个库。


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