学习参考书： http://nltk.googlecode.com/svn/trunk/doc/book/
1. 使用代理下载数据
nltk.set_proxy("**.com:80")
nltk.download()
2. 使用sents(fileid)函数时候出现：Resource 'tokenizers/punkt/english.pickle' not found. Please use the NLTK Downloader to obtain the resource:
import nltk
nltk.download()
安装窗口中选择'Models'项，然后'在 'Identifier' 列找 'punkt，点击下载安装该数据包
3. 语料Corpus元素获取函数
from nltk.corpus import webtext
webtext.fileids() #得到语料中所有文件的id集合
webtext.raw(fileid) #给定文件的所有字符集合
webtext.words(fileid) #所有单词集合
webtext.sents(fileid) #所有句子集合
4. 文本处理的一些常用函数
假若text是单词集合的列表
len(text) #单词个数
set(text) #去重
sorted(text) #排序
text.count('a') #数给定的单词的个数
text.index('a') #给定单词首次出现的位置
FreqDist(text) #单词及频率，keys()为单词，*[key]得到值
FreqDist(text).plot(50,cumulative=True) #画累积图
bigrams(text) #所有的相邻二元组
text.collocations() #找文本中频繁相邻二元组
text.concordance("word") #找给定单词出现的位置及上下文
text.similar("word") #找和给定单词语境相似的所有单词
text.common_context("a“,"b") #找两个单词相似的上下文语境
text.dispersion_plot(['a','b','c',...]) #单词在文本中的位置分布比较图
text.generate() #随机产生一段文本
to be continued
不知你是否注意到，当我们手机横屏，且使用Android自带的软键盘为EditText进行文本输入时，若不进行特殊的设置，该软键盘会占用整个界面，那么，如何让键盘只占用屏幕的一部分呢？ 其实只需要改一个小小的属性即可！
<EditText
android:id="@+id/text1"
android:layout_width="150dip"
android:layout_height="wrap_content"
android:imeOptions="flagNoExtractUi"/>
另外使用android:imeOptinos可对Android自带的软键盘进行一些界面上的设置：
android:imeOptions="flagNoExtractUi" //使软键盘不全屏显示，只占用一部分屏幕
同时,这个属性还能控件软键盘右下角按键的显示内容,默认情况下为回车键
android:imeOptions="actionNone" //输入框右侧不带任何提示
android:imeOptions="actionGo" //右下角按键内容为'开始'
android:imeOptions="actionSearch" //右下角按键为放大镜图片，搜索
android:imeOptions="actionSend" //右下角按键内容为'发送'
android:imeOptions="actionNext" //右下角按键内容为'下一步'
android:imeOptions="actionDone" //右下角按键内容为'完成'
同时，可能EditText添加相应的监听器，捕捉用户点击了软键盘右下角按钮的监听事件，以便进行处理。
editText.setOnEditorActionListener(new OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
Toast.makeText(MainActivity.this, "text2", Toast.LENGTH_SHORT).show();
return false;
}
});
创建部门表department
创建雇员表employee
新建持久化类
Department.java
package www.hbsi.net.many2one;
public class Department {
private Integer id;
private String name;
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
}
Employee.java
package www.hbsi.net.many2one;
public class Employee {
private Integer id;
private Department department;//反应了对象之间的关系
private String username;
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
public Department getDepartment() {
return this.department;
}
public void setDepartment(Department department) {
this.department = department;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
}
新建映射文件
Department.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="www.hbsi.net.many2one">
<class name="Department" table="department" catalog="hibernate">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="native" />
</id>
<property name="name" column ="name" type="string" />
</class>
</hibernate-mapping>
Employee.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="www.hbsi.net.many2one">
<class name="Employee" table="employee">
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="native" />
</id>
<property name="username" type="string" column ="username" />
<many-to-one name="department" column ="dept_id" />
</class>
</hibernate-mapping>
更改hibernate映射问价的mapping属性
hibernate.cfg.xml;
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/hibernate
</property>
<property name="connection.username">root</property>
<property name="connection.password">123456</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping resource="www/hbsi/net/many2one/Department.hbm.xml" />
<mapping resource="www/hbsi/net/many2one/Employee.hbm.xml" />
</session-factory>
</hibernate-configuration>
创建测试类
Many2one.java
package www.hbsi.net.many2one;
import javax.persistence.Temporal;
import org.hibernate.Session;
import org.junit.Test;
import www.hbsi.net.util.HibernateSessionFactory;
public class Many2one {
@Test
public void add(){
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
Department department = new Department();
department.setName("软件系");
Employee employee1 = new Employee();
employee1.setUsername("Nacy");
employee1.setDepartment(department);
Employee employee2 = new Employee();
employee2.setUsername("Tom");
employee2.setDepartment(department);
session .save(department);
session .save(employee1);
session .save(employee2);
session.getTransaction().commit();
HibernateSessionFactory.closeSession();
}
}
控制台输出：
department表
employee表
Many2one.java
/**
* 先保存部门在保存雇员
* 一般推荐这种方法
*/
package www.hbsi.net.many2one;
import org.hibernate.Session;
import org.junit.Test;
import www.hbsi.net.util.HibernateSessionFactory;
public class Many2one {
@Test
public void add(){
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
Department department = new Department();
department.setName("软件系");
Employee employee1 = new Employee();
employee1.setUsername("Nacy");
employee1.setDepartment(department);
Employee employee2 = new Employee();
employee2.setUsername("Tom");
employee2.setDepartment(department);
session .save(department);
session .save(employee1);
session .save(employee2);
session.getTransaction().commit();
HibernateSessionFactory.closeSession();
}
/**
* 通过雇员ID查找所属部门
*/
@Test
public void find() {
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
Employee employee = (Employee) session.get(Employee.class, 5);
System.out.println(employee.getUsername()+"--"+employee.getDepartment().getName());
session.getTransaction().commit();
HibernateSessionFactory.closeSession();
}
}