struts2完成增删改查
思路:
1、导入相关的pom依赖(struts、自定义标签库的依赖)
2、分页的tag类导入、z.tld、完成web.xml的配置
3、dao层去访问数据
4、web层去调用dao层给前台返回数据
5、在struts_sy.xml进行配置
6、写jsp界面
1、导入相关的pom依赖(struts、自定义标签库的依赖)
4.0.0
com.psy
caoluo
war
0.0.1-SNAPSHOT
caoluo Maven Webapp
http://maven.apache.org
junit
junit
4.12
test
javax.servlet
javax.servlet-api
4.0.1
provided
org.apache.struts
struts2-core
2.5.13
jstl
jstl
1.2
taglibs
standard
1.1.2
mysql
mysql-connector-java
5.1.44
org.apache.tomcat
tomcat-jsp-api
8.0.47
T224_caoluo
org.apache.maven.plugins
maven-compiler-plugin
3.7.0
1.8
UTF-8
2、分页的tag类导入、z.tld、完成web.xml的配置
/**
* 分页工具类
*
*/
public class PageBean {
private int page = 1;// 页码
private int rows = 4;// 页大小
private int total = 0;// 总记录数
private boolean pagination = true;// 是否分页
// 获取前台向后台提交的所有参数
private Map parameterMap;
// 获取上一次访问后台的url
private String url;
/**
* 初始化pagebean
*
* @param req
*/
public void setRequest(HttpServletRequest req) {
this.setPage(req.getParameter("page"));
this.setRows(req.getParameter("rows"));
// 只有jsp页面上填写pagination=false才是不分页
this.setPagination(!"fasle".equals(req.getParameter("pagination")));
this.setParameterMap(req.getParameterMap());
this.setUrl(req.getRequestURL().toString());
}
public int getMaxPage() {
return this.total % this.rows == 0 ? this.total / this.rows : this.total / this.rows + 1;
}
public int nextPage() {
return this.page < this.getMaxPage() ? this.page + 1 : this.getMaxPage();
}
public int previousPage() {
return this.page > 1 ? this.page - 1 : 1;
}
public PageBean() {
super();
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public void setPage(String page) {
this.page = StringUtils.isBlank(page) ? this.page : Integer.valueOf(page);
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = rows;
}
public void setRows(String rows) {
this.rows = StringUtils.isBlank(rows) ? this.rows : Integer.valueOf(rows);
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public void setTotal(String total) {
this.total = Integer.parseInt(total);
}
public boolean isPagination() {
return pagination;
}
public void setPagination(boolean pagination) {
this.pagination = pagination;
}
public Map getParameterMap() {
return parameterMap;
}
public void setParameterMap(Map parameterMap) {
this.parameterMap = parameterMap;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
/**
* 获得起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (this.page - 1) * this.rows;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination
+ ", parameterMap=" + parameterMap + ", url=" + url + "]";
}
}
z.tld
1.1 core library
core
1.1
z
/zking
page
com.tag.PageTag
JSP
pageBean
true
true
web.xml配置
encodingFiter
com.util.EncodingFiter
encodingFiter
/*
struts
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
struts
*.action
dao层去访问数据
public class ClazzDao extends BaseDao {
/**
* 查询分页 查询单个数据公用的方法
* @param clz
* @param pageBean
* @return
*/
public List list(Clazz clz,PageBean pageBean){
String sql="select * from t_struts_class where true";
String cname=clz.getCname();
int cid=clz.getCid();
if(cid!=0) {
sql +=" and cid = "+cid;
}
if(StringUtils.isNotBlank(cname)) {
sql +=" and cname like '%"+cname+"%'";
}
return super.executeQuery(sql, Clazz.class, pageBean);
}
/**
* 新增方法
* @param clz
* @return
*/
public int add(Clazz clz) {
String sql="insert into t_struts_class values(?,?,?,?)";
return super.executeUpdate(sql, new String[] {"cid","cname","cteacher","pic"}, clz);
}
/**
* 修改方法
* @param clz
* @return
*/
public int edit(Clazz clz) {
String sql="update t_struts_class set cname=?,cteacher=?,pic=? where cid=?";
return super.executeUpdate(sql, new String[] {"cname","cteacher","pic","cid"}, clz);
}
/**
* 删除方法
* @param clz
* @return
*/
public int del(Clazz clz) {
String sql="delete from t_struts_class where cid=?";
return super.executeUpdate(sql, new String[] {"cid"}, clz);
}
}
web层调用dao返回数据给jsp
public class ClazzAction extends BaseAction implements ModelDriven{
private ClazzDao clzDao=new ClazzDao();
private Clazz clz=new Clazz();
public String list() {
PageBean pageBean=new PageBean();
pageBean.setRequest(request);
List list=this.clzDao.list(clz, pageBean);
request.setAttribute("clzList", list);
request.setAttribute("pageBean", pageBean);
return "list";
}
/**
* 跳转新增修改页面的工用方法
* @return
*/
public String preSave() {
if(clz.getCid()!=0) {
Clazz c=this.clzDao.list(clz, null).get(0);
request.setAttribute("clz", c);
}
return "preSave";
}
/**
* 新增
* @return
*/
public String add() {
result= this.clzDao.add(clz);
return "toList";
}
/**
* 修改
* @return
*/
public String edit() {
this.clzDao.edit(clz);
return "toList";
}
/**
* 删除
* @return
*/
public String del() {
this.clzDao.del(clz);
return "toList";
}
@Override
public Clazz getModel() {
// TODO Auto-generated method stub
return clz;
}
}
在struts_sy.xml进行配置
/clzList.jsp
/clzEdit.jsp
/clz_list
写jsp界面
首页:
新增
编号
班级名
教员
图片
操作
${c.cid }
${c.cname }
${c.cteacher }
${c.pic }
修改
删除
上传图片
新增页面与修改公用页面
运行效果图