问题：
既然开始学习搭建SSH框架了，就必须对其3个框架起到的作用有一定的了解。
1.struts2------替代了原来servlet的作用,对Http的请求进行处理和逻辑验证。
2.spring-------相当于中间商的作用，它把hibernate的配置文件并把一些依赖属性进行赋值，实现了很大的分层作用，让耦合性大大降低。
3.Hibernate的作用替代了原来JDBC的编写，他的优势就在于能够进行映射的处理，从而大大优化了与数据库的连接。
这是我现在所了解的SSH里的3大技术，因为是学习第一遍所以还不够深刻，现在我在做SSH框架塔的唐诗搜索网站，先对原来做的Hibernate技术 和 Struts2技术实现的唐诗查找系统进行总结。
工程名PoatQueryStruts(Struts2+JDBC技术)
包：com.wyt.action
```
package com.wyt.action;import java.util.List;import javax.servlet.ServletRequest;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;import com.wyt.factory.DAOFactory;import com.wyt.vo.Poetries;public class QueryAction extends ActionSupport {/** * */private static final long serialVersionUID = 1L;private int queryType;private String queryContent;public String execute() throws Exception {// 用工厂类进行数据库连接还有数据库搜索操作,返回结果储存在迭代器里Listall = DAOFactory.getIPoetriesDaoInstance().findPoertries(queryType, queryContent);
// 将迭代器存进Session里面,进行数据共享
ServletRequest request = ServletActionContext.getRequest();
HttpServletRequest req = (HttpServletRequest) request;
req.setAttribute("queryType", queryType);
HttpSession session = req.getSession();
session.setAttribute("result", all);
if (all.isEmpty()) {
return "fail";
} else {
return "success";
}
}
public int getQueryType() {
return queryType;
}
public void setQueryType(int queryType) {
this.queryType = queryType;
}
public String getQueryContent() {
return queryContent;
}
public void setQueryContent(String queryContent) {
this.queryContent = queryContent;
}
}
```
包:com.wyt.dao
```
package com.wyt.dao;import java.util.List;import com.wyt.vo.Poetries;public interface IPoetriesDao {public ListfindPoertries(int querType,String queryContent)throws Exception;
}
```
包com.wyt.dao.impl
```
package com.wyt.dao.impl;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.util.ArrayList;import java.util.List;import com.wyt.dao.IPoetriesDao;import com.wyt.vo.Poetries;public class PoetriesDaoImpl implements IPoetriesDao {private Connection conn = null;private PreparedStatement pstmt = null;public PoetriesDaoImpl(Connection conn) {this.conn = conn;}public ListfindPoertries(int queryType,String queryContent) throws Exception {Listall = new ArrayList();
String sql = "SELECT name,title,content "
+ "from poetries pt LEFT JOIN poets p on pt.poet_id = p.id where ";
//String hql = "select SUBSTRING(p.content,1,15) from Poetries p where p.poets.name=:poetName";
switch (queryType) {
case 1:
sql = sql+" name = ?";
break;
case 2:
sql = sql+"title LIKE ?";
queryContent = "%"+queryContent+"%";
break;
default:
sql = sql+"content LIKE ?";
queryContent = "%"+queryContent+"%";
break;
}
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, queryContent);
ResultSet rs = pstmt.executeQuery();
Poetries poetries = null;
while(rs.next()){
poetries = new Poetries();
poetries.setName(rs.getString(1));
poetries.setTitle(rs.getString(2));
poetries.setContent(rs.getString(3));
all.add(poetries);
}
pstmt.close();
return all;
}
}
```
包：com.wyt.dao.proxy
```
package com.wyt.dao.proxy;import java.sql.Connection;import java.util.List;import com.wyt.dao.IPoetriesDao;import com.wyt.dao.impl.PoetriesDaoImpl;import com.wyt.util.ConnectionFactory;import com.wyt.vo.Poetries;public class PoetriesDaoProxy implements IPoetriesDao {private Connection conn = null;private IPoetriesDao dao = null;public PoetriesDaoProxy() {this.conn = ConnectionFactory.getInstance().makeConnection();this.dao = new PoetriesDaoImpl(this.conn);}public ListfindPoertries(int querType, String queryContent) throws Exception {Listall = null;
try{
all = this.dao.findPoertries(querType, queryContent);
}catch(Exception e){
throw e;
}finally{
this.conn.close();
}
return all;
}
}
```
包：com.wyt.factory
```
package com.wyt.factory;
import com.wyt.dao.IPoetriesDao;
import com.wyt.dao.proxy.PoetriesDaoProxy;
public class DAOFactory {
public static IPoetriesDao getIPoetriesDaoInstance()throws Exception{
return new PoetriesDaoProxy();
}
}
```
包名：com.wyt.util
```
package com.wyt.util;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.util.Properties;
public class ConnectionFactory {
private static String driver;
private static String dburl;
private static String user;
private static String password;
private Connection conn = null;
private static final ConnectionFactory FACTORY =new ConnectionFactory();
static{
Properties prop= new Properties();
try {
InputStream in = ConnectionFactory.class.getClassLoader()
.getResourceAsStream("dbConfig.properties");
prop.load(in);
} catch (Exception e) {
System.out.println("配置文件读取错误！");
}
driver = prop.getProperty("driver");
dburl = prop.getProperty("dburl");
System.out.println(dburl);
user = prop.getProperty("user");
password = prop.getProperty("password");
}
public Connection makeConnection(){
try {
Class.forName(driver);
conn = DriverManager.getConnection(dburl,user,password);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
public static ConnectionFactory getInstance(){
return FACTORY;
}
public void close() throws Exception{
if(this.conn != null)
try {
this.conn.close();
} catch (Exception e) {
throw e;
}
}
}
```
包名：com.wyt.vo
```
package com.wyt.vo;
public class Poetries {
private String title;
private String name;
private String content;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
```
struts.xml配置文件
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