What is the difference between clob and blob in mysql

CREATE TABLE person (
  name varchar(20),
  address text
);

import java.io.File;
import java.io.FileReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
 
public class clob {
	/**
	 * @param args
	 */
	//驱动程序就是之前在classpath中配置的JDBC的驱动程序的JAR 包中
	public static final String DBDRIVER = "com.mysql.jdbc.Driver";
	//连接地址是由各个数据库生产商单独提供的，所以需要单独记住
	public static final String DBURL = "jdbc:mysql://192.168.0.4:3306/myDB";
	//连接数据库的用户名
	public static final String DBUSER = "root";
	//连接数据库的密码
	public static final String DBPASS = "";
	
	public static void main(String[] args) throws Exception {
		Connection con = null; 
		PreparedStatement stmt = null;
		try {
			//1、加载数据库驱动程序
			Class.forName(DBDRIVER); 
			//2、连接数据库
			con = DriverManager.getConnection(DBURL,DBUSER,DBPASS); 
			//3、创建Statement 
			stmt = con.prepareStatement("insert into person(name,address) values(?,?)");			
			stmt.setString(1,"April");
			stmt.setClob(2, new FileReader(new File("D:\\work\\info.txt")));        			
			//4、执行SQL语句
			stmt.executeUpdate();	
		}catch(SQLException e) {
			//5、异常处理
		}
		finally {
			//6、清理资源
			if(con !=null)
			{
				con.close(); 
			}
			if(stmt!=null)
			{
				stmt.close();
			}
		}				
	}
}

stmt.setClob(2, new BufferedReader(new InputStreamReader(new ByteArrayInputStream("四川省成都市高新区".getBytes()))));

stmt = con.prepareStatement("select * from person");
rs = stmt.executeQuery();
while(rs.next())
{
	Clob address = rs.getClob("address"); 
	Reader reader = address.getCharacterStream(); 			
	int temp = 0;
	while((temp = reader.read()) != -1)  
	{
		System.out.print((char)temp);
	}
	reader.close();
}

四川省成都市高新区
浙江省杭州市西湖区

CREATE TABLE student (
  name varchar(20),
  image blob
);

stmt = con.prepareStatement("insert into student(name,image) values(?,?)");			
stmt.setString(1,"April");
stmt.setBlob(2, new FileInputStream("D:\\work\\April.png"));
stmt.executeUpdate();

stmt = con.prepareStatement("select * from student");
rs = stmt.executeQuery();
while(rs.next())
{
	Blob image = rs.getBlob("image"); 
	InputStream in = image.getBinaryStream(); 
	OutputStream out = new FileOutputStream("D:\\work\\Harris.png");
	int temp = 0;
	while((temp = in.read()) != -1)  
	{
		out.write(temp);
	}
	in.close();
	out.close();
}