spring实现分页代码整合redis判断

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控制类

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import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSON;
import com.bdqn.entity.Grade;
import com.bdqn.entity.student;
import com.bdqn.service.ServiceDao;
import com.bdqn.service.StudentServiceDao;
import com.bdqn.util.ToolUtil;
import com.mysql.jdbc.Field;

import redis.clients.jedis.Jedis;

@Controller
@RequestMapping("student")
public class studentContorller {
	@Autowired
	StudentServiceDao stu;
	@Autowired
	ServiceDao grade;
	@Autowired
	Jedis jedis;//在下面展示配置
	@RequestMapping("list")
	public String list(@RequestParam(defaultValue="1")int index,@RequestParam(defaultValue="0")int gradeId,String name,Model model,HttpServletRequest request) {
		//SpringMVC中取Session
				HttpSession session = request.getSession();
				ToolUtil<student> list=null;
				//在Session中封装每一个用户的查询条件。如果有条件，则存储条件		
			String key="student"+index;
			if(jedis.exists(key)) {
				System.out.println("缓存获取");
				String str=jedis.get(key);
				list=JSON.parseObject(str,ToolUtil.class);
			}else {
				System.out.println("数据库获取");
				list=stu.page(index, 4,gradeId,name);
				String json=JSON.toJSONString(list);
				jedis.set(key, json);
			}
			String key1="student"+index+gradeId;
			if(jedis.exists(key1)) {
				System.out.println("缓存获取");
				String str=jedis.get(key1);
				list=JSON.parseObject(str,ToolUtil.class);
			}else {
				System.out.println("数据库获取");
				if(gradeId != 0) {
					session.setAttribute("gradeId", gradeId);
				}
				else {  //如果没有条件，则看Session中有没有条件。
				if(session.getAttribute("gradeId") != null)
					   gradeId = (int)session.getAttribute("gradeId");
				}
				list=stu.page(index, 4,gradeId,name);
				String json=JSON.toJSONString(list);
				jedis.set(key1, json);
			}
			String key2="student"+index+name;
			if(jedis.exists(key2)) {
				System.out.println("缓存获取");
				String str=jedis.get(key2);
				list=JSON.parseObject(str,ToolUtil.class);
			}else {
				System.out.println("数据库获取");
				if(name != null) {
					session.setAttribute("name", name);
				}
				else {
					if(session.getAttribute("name") != null)
						name = (String) session.getAttribute("name");
				}	
				list=stu.page(index, 4,gradeId,name);
				String json=JSON.toJSONString(list);
				jedis.set(key2, json);
			}
			String key3="student"+index+name+gradeId;
			if(jedis.exists(key3)) {
				System.out.println("缓存获取");
				String str=jedis.get(key3);
				list=JSON.parseObject(str,ToolUtil.class);
			}else {
				System.out.println("数据库获取");
				if(gradeId != 0) {
					session.setAttribute("gradeId", gradeId);
				}
				else {  //如果没有条件，则看Session中有没有条件。
				if(session.getAttribute("gradeId") != null)
					   gradeId = (int)session.getAttribute("gradeId");
				}
				if(name != null) {
					session.setAttribute("name", name);
				}
				else {
					if(session.getAttribute("name") != null)
						name = (String) session.getAttribute("name");
				}	
				list=stu.page(index, 4,gradeId,name);
				String json=JSON.toJSONString(list);
				jedis.set(key3, json);
			}
		List<Grade> lists=grade.selectAll();
		model.addAttribute("grade",lists);
		model.addAttribute("students",list);
		model.addAttribute("gradeId", gradeId);
		model.addAttribute("name", name);	
		return "studentList";
	}

jedis配置

<bean id="jedis" class="redis.clients.jedis.Jedis">
		<constructor-arg name="host" value="127.0.0.1" />
		<constructor-arg name="port" value="6379" />