java开发问题汇总

打开navigator模式 window-> show view -> Navigator
展开项目，打开 .classpath 文件一般在工程末尾
在标签 <classpath> 中第一行添加如下内容 <classpathentry kind="src" output="target/classes" path="src/main/java"/>
保存

jdbcTemplate入门

http://www.cnblogs.com/Fskjb/archive/2009/11/18/1605622.html

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

    <bean id="springDSN"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName"
            value="com.mysql.jdbc.Driver">
        </property>
        <property name="url"
            value="jdbc:mysql://192.168.2.2:3306/test1?useUnicode=true&amp;characterEncoding=UTF-8">
        </property>
        <property name="username" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>

    <bean id="jdbcTemplate"
        class="org.springframework.jdbc.core.JdbcTemplate" abstract="false"
        lazy-init="false" autowire="default" dependency-check="default">
        <property name="dataSource">
            <ref bean="springDSN" />
        </property>
    </bean>
    <bean id="userDao" class="zzz.lcy.jdbcTemplate.UserDAO">
       <property name="jdbcT">
          <ref bean="jdbcTemplate" />
       </property>
    </bean>
</beans>

View Code

package zzz.lcy.jdbcTemplate;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public final class SpringUtil {

    private static ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    public static Object getBean(String beanName) {
        return ctx.getBean(beanName);
    }
}

View Code

package zzz.lcy.jdbcTemplate;

public class User {

    private Integer id;
    private String name;
    private String pwd;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
}

View Code

package zzz.lcy.jdbcTemplate;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.springframework.jdbc.core.JdbcTemplate;

public class UserDAO {

    private JdbcTemplate jdbcT;// = (JdbcTemplate)SpringUtil.getBean("jdbcTemplate");
    public void setJdbcT(JdbcTemplate jdbcT) {
        this.jdbcT = jdbcT;
    }
    public List findAll() {
        return jdbcT.queryForList("select * from user");
    }
    public List<User> findAllUsers() {
        List<User> users = new ArrayList<User>();
        List list = findAll();
        Iterator it = list.iterator();
        User user = null;
        while (it.hasNext()) {
            Map m4usr = (Map)it.next();
            user = new User();
            user.setId((Integer)m4usr.get("id"));
            user.setName((String)m4usr.get("name"));
            user.setPwd((String)m4usr.get("pwd"));
            users.add(user);
        }
        return users;
    }
    public int insert(String name, String pwd) {
        String sql = "insert into user(name,pwd) values(?,?)";
        return jdbcT.update(sql, new Object[]{name,pwd});
    }
    public int delete(int bid){
        String sql = "delete from BookInfo where bid =?";
        return jdbcT.update(sql, new Object[]{bid});
    }
    
    public static void main(String[] args) throws Exception {
        UserDAO ud = (UserDAO)SpringUtil.getBean("userDao");//new UserDAO();
//        ud.insert("小明", "123");
        List list = ud.findAll();
        System.out.println(list.size());
        List<User> users = ud.findAllUsers();
        for (User u : users) {
            System.out.println(u.getName());
        }
    }
}

View Code

java访问mysql实例

package zzz.lcy.dbconn;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class MysqlDemo {

    public static void main(String[] args) throws Exception {
        Connection  conn = null;
        String sql;
        String url = "jdbc:mysql://192.168.2.2:3306/test?user=root&password=123456";
        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection(url);
        Statement stmt = conn.createStatement();
        sql = "create table student(NO char(20),name varchar(20),primary key(NO))";
        int result = stmt.executeUpdate(sql);
        if (result != -1) {
            sql = "insert into student(NO, name) values('100001','aaa'),('100002','bbb')";
            result = stmt.executeUpdate(sql);
            sql = "select * from student";
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                System.out.println(rs.getString(1) + "	" + rs.getString(2));
            }
            rs.close();
        }
        conn.close();
    }
}

View Code

java开发问题汇总

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