SpringMVC之AJAX带分页的增删改查
架包支持：
form.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
编号
姓名
薪水
操作
当前页 共页 共条
web.xml:
contextConfigLocation
classpath:/spring.xml
org.springframework.web.context.ContextLoaderListener
utf
org.springframework.web.filter.CharacterEncodingFilter
encoding
UTF-8
utf
/*
myencode
org.springframework.web.filter.CharacterEncodingFilter
encoding
UTF-8
hidden
org.springframework.web.filter.HiddenHttpMethodFilter
hidden
/*
spring
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
/WEB-INF/springmvc.xml
0
spring
*.action
/
index.jsp
图片素材：
springmvc.xml:
text/html;charset=UTF-8
application/x-www-form-urlencoded
application/json;charset=UTF-8
spring.xml:
Action类：
package cn.et.springmvc.lesson05.emp.controller;
import java.io.IOException;
import java.io.OutputStream;
import net.sf.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import cn.et.springmvc.lesson05.emp.entity.Emp;
import cn.et.springmvc.lesson05.emp.service.EmpService;
import cn.et.springmvc.lesson05.emp.utils.PageEntity;
@Controller
public class AjaxAction {
@Autowired
private EmpService service;
/**
* ajax请求跳转是没有用的，所以返回字节数组
* 表示将json转换为字节输出给响应流
*
* @ResponseBody 这里修改了返回值，所以必须要加上这句代码
* 这里没有返回值，使用分页
* @return
* @throws IOException
*/
@ResponseBody
@RequestMapping(value="/ajaxQuery")
public void ajaxQuery(String ename, String curPage, OutputStream os) throws IOException{
int intCurPage = Integer.parseInt(curPage);
PageEntity pe = service.query(ename,intCurPage);
//将数组、对象或者集合转换成字符串的json 再传给xhr对象
//把list集合转换成json字符串
String json = JSONObject.fromObject(pe).toString();
os.write(json.getBytes("UTF-8"));
}
/**
* 新增
* 如果返回值为void,那么形参必须配上OutputStream os不然会报错的
* @param ename
* @param sal
* @param os
* @throws IOException
*/
@RequestMapping(value="/ajaxAdd")
public void ajaxAdd(String ename,String sal,OutputStream os) throws IOException{
try {
service.add(ename, sal);
os.write("1".getBytes("UTF-8"));
} catch (Exception e) {
os.write("0".getBytes("UTF-8"));
}
}
/**
* 删除
* 如果返回值为void,那么形参必须配上OutputStream os不然会报错的
* @throws IOException
*/
@RequestMapping(value="/ajaxDelete")
public void ajaxDelete(String eno,OutputStream os) throws IOException{
try {
service.delete(eno);
os.write("1".getBytes("UTF-8"));
} catch (Exception e) {
os.write("0".getBytes("UTF-8"));
}
}
/**
* 修改
* 如果返回值为void,那么形参必须配上OutputStream os不然会报错的
* @throws IOException
*/
@RequestMapping(value="/ajaxUpdate")
public void ajaxUpdate(Emp emp,OutputStream os) throws IOException{
try {
service.update(emp);
os.write("1".getBytes("UTF-8"));
} catch (Exception e) {
os.write("0".getBytes("UTF-8"));
}
}
/**
* 需要配置org.springframework.http.converter.json.MappingJackson2HttpMessageConverter
* 才可以直接返回其它对象
* @param ename
* @param curPage
* @return
* @throws IOException
*/
@ResponseBody
@RequestMapping(value="/ajaxQuery2")
public PageEntity ajaxQuery(String ename, String curPage) throws IOException{
int intCurPage = Integer.parseInt(curPage);
PageEntity pe = service.query(ename,intCurPage);
//将数组、对象或者集合转换成字符串的json 再传给xhr对象
//把list集合转换成json字符串
return pe;
}
}
dao接口：
package cn.et.springmvc.lesson05.emp.dao;
import java.util.List;
import java.util.Map;
import cn.et.springmvc.lesson05.emp.entity.Emp;
public interface EmpDao {
/**
* 查询总一共有多少符合条件的数据
* @param ename
* @return
*/
public abstract int queryCount(String ename);
/**
* 通过用户名查询
* @param ename
* @return
*/
public abstract List> query(String ename);
/**
* 查询当前页的数据
* @param ename
* @param start
* @param end
* @return
*/
public abstract List> queryPage(String ename,int start, int end);
/**
* 新增
*/
public abstract void add(String ename, String sal);
/**
* 删除
*/
public abstract void delete(String eno);
/**
* 修改
*/
public abstract void update(Emp emp);
} daoImpl实现类：
package cn.et.springmvc.lesson05.emp.dao.impl;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import cn.et.springmvc.lesson05.emp.dao.EmpDao;
import cn.et.springmvc.lesson05.emp.entity.Emp;
@Repository
public class EmpDaoImpl implements EmpDao {
@Autowired
private JdbcTemplate jdbcTemplate;
/**
* 查询总条数
* @see cn.et.emp.dao.impl.EmpDao#query(java.lang.String)
*/
public int queryCount(String ename){
if(ename==null){
ename="";
}
String sql="select count(rowid) as TC from emp2 where ename like '%"+ename+"%' ";
Map map=jdbcTemplate.queryForMap(sql);
return ((BigDecimal)map.get("TC")).intValue();
}
/**
* 查询
* @see cn.et.emp.dao.impl.EmpDao#query(java.lang.String)
*/
public List> query(String ename){
List> list = null;
if(ename == null || ename == ""){
String sql = "select * from emp2";
list = jdbcTemplate.queryForList(sql);
}else{
String sql = "select * from emp2 where ename like ?";
list = jdbcTemplate.queryForList(sql,"%"+ename+"%");
}
return list;
}
/**
* 查询当前页的数据
*/
public List> queryPage(String ename,int start, int end){
List> list = null;
if(ename == null || ename == ""){
String sql = "select * from (select e.*,rownum rn from emp2 e)" +
" where rn between "+start+" and "+end;
list = jdbcTemplate.queryForList(sql);
}else{
String sql = "select * from (select e.*,rownum rn from emp2 e where ename like ?)" +
" where rn between "+start+" and "+end;
list = jdbcTemplate.queryForList(sql,"%"+ename+"%");
}
return list;
}
/**
* 新增
* @see cn.et.emp.dao.impl.EmpDao#add(java.lang.String, java.lang.String)
*/
public void add(String ename,String sal){
String sql = "insert into emp2 values((select nvl(max(eno),0)+1 from emp2),?,"+sal+")";
jdbcTemplate.update(sql, ename);
}
/**
* 删除
* @see cn.et.emp.dao.impl.EmpDao#delete(java.lang.String)
*/
public void delete(String eno){
String sql = "delete from emp2 where eno="+eno;
jdbcTemplate.update(sql);
}
/**
* 修改
* @see cn.et.emp.dao.impl.EmpDao#update(en.et.emp.entity.Emp)
*/
public void update(Emp emp){
String sql = "update emp2 set ename=?,sal="+emp.getSal()+" where eno="+emp.getEno();
jdbcTemplate.update(sql, emp.getEname());
}
}
service接口：
package cn.et.springmvc.lesson05.emp.service;
import cn.et.springmvc.lesson05.emp.entity.Emp;
import cn.et.springmvc.lesson05.emp.utils.PageEntity;
public interface EmpService {
/* 查询
* @see cn.et.emp.dao.impl.EmpDao#query(java.lang.String)
*/
public abstract PageEntity query(String ename,int curPage);
/* 新增
* @see cn.et.emp.dao.impl.EmpDao#add(java.lang.String, java.lang.String)
*/
public abstract void add(String ename, String sal);
/* 删除
* @see cn.et.emp.dao.impl.EmpDao#delete(java.lang.String)
*/
public abstract void delete(String eno);
/* 修改
* @see cn.et.emp.dao.impl.EmpDao#update(en.et.emp.entity.Emp)
*/
public abstract void update(Emp emp);
}serviceImpl实现类：
package cn.et.springmvc.lesson05.emp.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import cn.et.springmvc.lesson05.emp.dao.EmpDao;
import cn.et.springmvc.lesson05.emp.entity.Emp;
import cn.et.springmvc.lesson05.emp.service.EmpService;
import cn.et.springmvc.lesson05.emp.utils.PageEntity;
import cn.et.springmvc.lesson05.emp.utils.PageUtils;
/**
* 服务层掉用dao层的方法
* @author Administrator
*
*/
@Service
public class EmpServiceImpl implements EmpService {
//自动装配
@Autowired
private EmpDao dao;
/* 查询
* @see cn.et.emp.dao.impl.EmpDao#query(java.lang.String)
*/
public PageEntity query(String ename,int curPage){
//获取到总条数
int total = dao.queryCount(ename);
//再创建PageEntity实体类把当前页，每页显示多少条数据和总共多少条数据传进去
PageEntity pe = PageUtils.calc(curPage, 10, total);
List list = dao.queryPage(ename, pe.getStartIndex(), pe.getEndIndex());
pe.setData(list);
return pe;
}
/* 新增
* @see cn.et.emp.dao.impl.EmpDao#add(java.lang.String, java.lang.String)
*/
public void add(String ename,String sal){
dao.add(ename, sal);
}
/* 删除
* @see cn.et.emp.dao.impl.EmpDao#delete(java.lang.String)
*/
public void delete(String eno){
dao.delete(eno);
}
/* 修改
* @see cn.et.emp.dao.impl.EmpDao#update(en.et.emp.entity.Emp)
*/
public void update(Emp emp){
dao.update(emp);
}
public PageEntity query(String ename) {
// TODO Auto-generated method stub
return null;
}
}
utils工具包---PageEntity：
package cn.et.springmvc.lesson05.emp.utils;
import java.util.List;
public class PageEntity {
/**
* 数据库查询的总条数
*/
private int totalSize;
/**
* 每页显示的条数
*/
private int pageSize=10;
/**
* 总页数
*
* totalSize=20 pageSize=10
* 最后公式：pageCount=(totalSize%pageSize==0?totalSize/pageSize:(totalSize/pageSize+1))
*/
private int pageCount;
/**
* 当前页
*/
private int curPage;
/**
* 上一页
* prevPage=curPage==1?curPage:curPage-1
*/
private int prevPage;
/**
* 下一页
* 最后公式：nextPage=curPageutils工具包---PageUtils：
package cn.et.springmvc.lesson05.emp.utils;
public class PageUtils {
/**
* 计算上一页、下一页等...
* @param curPage 当前页
* @param pageSize 每页显示的条数
* @param totalSize 数据库查询的总条数
* @return
*/
public static PageEntity calc(int curPage, int pageSize, int totalSize){
PageEntity pe = new PageEntity();
pe.setCurPage(curPage);
pe.setPageSize(pageSize);
pe.setTotalSize(totalSize);
int pageCount=(totalSize%pageSize==0?totalSize/pageSize:(totalSize/pageSize+1));
int prevPage=curPage==1?curPage:curPage-1;
int nextPage=curPageEntity实体类：
package cn.et.springmvc.lesson05.emp.entity;
public class Emp {
private String eno;
private String ename;
private String sal;
public Emp(){}
public Emp(String eno, String ename, String sal) {
super();
this.eno = eno;
this.ename = ename;
this.sal = sal;
}
public String getEno() {
return eno;
}
public void setEno(String eno) {
this.eno = eno;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getSal() {
return sal;
}
public void setSal(String sal) {
this.sal = sal;
}
}
jdbc.properties：
url=jdbc\:oracle\:thin\:@localhost\:1521\:orcl
driverClass=oracle.jdbc.OracleDriver
account=scott
password=tiger